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Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 21844. Отображено 100.
05-01-2012 дата публикации

High voltage switch with adjustable current

Номер: US20120002685A1
Автор: Thorald Horst Bergmann
Принадлежит: Bergmann Messgeraete Entwicklung KG

The present disclosure relates to a high voltage switch which may comprise a chain of MOS field-effect transistors (MOSFETs). The current of the individual MOSFETS, and hence the chain, can be controlled by means of adding a current measuring resistance into the source path of the transistors and transmitting the voltage arising there via a capacitor to a gate connector of the transistors.

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Номер записи: 1
03-05-2017 дата публикации

Твердотельный лазер

Номер: RU0000170707U1
Автор: Александр Иванович Неменёнок, Анатолий Михайлович Тареев, Андрей Сергеевич Красковский, Валентин Вениаминович Батюшков, Оксана Юрьевна Веселова, Сергей Николаевич Титовец
Принадлежит: Открытое Акционерное Общество "Пеленг"

Полезная модель относится к лазерной технике. Твердотельный лазер содержит корпус, активный элемент, лампу накачки и резонатор, состоящий из оптически связанных устройства для излома оси резонатора в оправе и концевого элемента в оправе, включающего выходное и глухое зеркала. Устройство для излома оси резонатора выполнено в виде трехгранной призмы БкР - 180°, концевой элемент выполнен в виде стеклянной подложки с нанесенными выходным и глухим зеркалами. Резонатор содержит электрооптический затвор и поляризатор, а оправа с концевым элементом и оправа с устройством для излома оси имеют плоскую опорную поверхность, опирающуюся на соответствующую торцевую грань корпуса. Корпус имеет две противоположные плоские боковые грани, параллельные оптической оси резонатора, причем в корпусе выполнена сквозная полость прямоугольной формы, проходящая через указанные противоположные плоские боковые грани. На боковых гранях корпуса напротив полости установлены две платформы, на первой платформе закреплен первый отражатель, а на второй платформе закреплен второй отражатель, лампа накачки, лазерный электрооптический затвор и поляризатор. Платформы установлены так, что закрепленные на них элементы обращены внутрь сквозной полости, при этом первый и второй отражатели, имеющие внутреннюю рабочую поверхность в виде части цилиндра с диффузно отражающим покрытием, совместно образуют цилиндрическую поверхность, охватывающую активный элемент и лампу накачки, при этом поляризатор и лазерный электрооптический затвор расположены между глухим зеркалом и трехгранной призмой БкР - 180°. Заявляемая полезная модель обеспечивает стабилизацию энергетических и пространственных параметров излучения в широком диапазоне температур окружающей среды и при воздействии ударов и вибрации в широком диапазоне частот и ускорений. 4 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 170 707 U1 (51) МПК H01S 3/02 (2006.01) H01S 3/115 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ФОРМУЛА ПОЛЕЗНОЙ МОДЕЛИ ...

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Номер записи: 2
11-07-2017 дата публикации

Кольцевой параметрический генератор терагерцового излучения

Номер: RU0000172492U1
Автор: Алексей Сергеевич Абрамов, Андрей Александрович Фотиади, Дмитрий Игоревич Семенцов, Игорь Олегович Золотовский
Принадлежит: федеральное государственное бюджетное образовательное учреждение высшего образования "Ульяновский государственный университет"

Полезная модель относится к области нелинейной оптики и касается кольцевого параметрического генератора терагерцового излучения. Генератор включает в себя два твердотельных лазера накачки с мало отличающимися частотами генерации оптического диапазона и кольцевой резонатор, обеспечивающий обратную связь для сигнальной волны, частота которой равна разности генерируемых лазерами накачки частот. Резонатор образован двумя плоскими зеркалами, интерферометром Жира-Турнуа и нелинейной периодической брегговской структурой. Излучение накачки второго лазера вводится в систему через управляемую оптическую призму в направлении, встречном по отношению к направлению излучения первого лазера накачки. Угол ввода встречного излучения может изменяться за счет изменения угла поворота призмы. Технический результат заключается в повышении коэффициента преобразования мощности. 2 ил. Ц 1 172492 ко РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) (11) се а а за (13) а о (51) МПК ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ СО2Е 1/39 (2006.01) (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (21)(22) Заявка: 2016143484, 03.11.2016 (24) Дата начала отсчета срока действия патента: 03.11.2016 Дата регистрации: 11.07.2017 Приоритет(ы): (22) Дата подачи заявки: 03.11.2016 (45) Опубликовано: 11.07.2017 Бюл. № 20 Адрес для переписки: 432017, г. Ульяновск, ул. Л. Толстого, 42, Ульяновский государственный университет, проректору по НРи ИТ Голованову В.Н. (72) Автор(ы): Абрамов Алексей Сергеевич (КП), Золотовский Игорь Олегович (КП), Семенцов Дмитрий Игоревич (КО), Фотиади Андрей Александрович (КП) (73) Патентообладатель(и): федеральное государственное бюджетное образовательное учреждение высшего образования "Ульяновский государственный университет" (КП) (56) Список документов, цитированных в отчете о поиске: Абрамов А.С. и др. "Кольцевой оптический генератор излучения в терагерцовом и дальнем ИК диапазонах", ОПТИКА И СПЕКТРОСКОПИЯ, т. 117, № 1, 2014 г., стр.100-105. Айрапетян В.С. Широкова Т.А. "Кольцевая схема резонатора ...

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Номер записи: 3
22-12-2017 дата публикации

Лазерный генератор импульсов широкого спектра

Номер: RU0000175897U1
Автор: Андрей Александрович Фотиади, Виктор Анатольевич Лапин, Дмитрий Игоревич Семенцов, Игорь Олегович Золотовский
Принадлежит: федеральное государственное бюджетное образовательное учреждение высшего образования "Ульяновский государственный университет"

Полезная модель относится к лазерной технике, в частности к волоконным лазерам. Лазерный генератор импульсов широкого спектра состоит из источника накачки и кольцевого резонатора, образованного устройством ввода излучения накачки, активным волокном с нормальной дисперсией, легированным ионами редкоземельных элементов, оптическим изолятором, насыщающимся поглотителем, одномодовым волокном-модулятором, устройством вывода излучения и спектральным фильтром. При этом волокно-модулятор обладает аномальной дисперсией, модуль которой уменьшается по длине по экспоненциальному закону. Технический результат заключается в обеспечении возможности увеличения ширины спектра выходного импульса, за счёт повышения эффективности нелинейной фазовой самомодуляции в волокне-модуляторе. 2 ил. Ц 1 175897 ко РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) (11) зе га за (13) (51) МПК НО1$ 3/067 (2006.01) НО1$ 3/083 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (52) СПК НО/5$ 306791 (20/1/02) (21)(22) Заявка: 2016143481, 03.11.2016 (72) Автор(ы): (24) Дата начала отсчета срока действия патента: 03.11.2016 Дата регистрации: 22.12.2017 Приоритет(ь): (22) Дата подачи заявки: 03.11.2016 (45) Опубликовано: 22.12.2017 Бюл. № 36 Адрес для переписки: 432017, г. Ульяновск, ул. Л. Толстого, 42, Ульяновский государственный университет, проректору по НР и ИТ Голованову В.Н. Золотовский Игорь Олегович (КП), Лапин Виктор Анатольевич (КО), Семенцов Дмитрий Игоревич (КО), Фотиади Андрей Александрович (КП) (73) Патентообладатель(и): федеральное государственное бюджетное образовательное учреждение высшего образования "Ульяновский государственный университет" (КП) (56) Список документов, цитированных в отчете о поиске: О... КасВаг4зоп е{ а|. "Репод1саПу атрИЯед зузет Базед оп 105$ сотрепза п? Чзрегз1оп 4есгеазше Нбге", Еесгошсз ГеЦетсз, у01.32, 1551е 4, 15.02.1996, стр. 373-374. Ц 6204960 В1, 20.03.2001. ВО 118767 91, 27.02.2012. \О 0033114 А2, 08.06.2000. (54) Лазерный ...

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Номер записи: 4
23-08-2018 дата публикации

Многоканальный генератор последовательных импульсов с регулируемой временной задержкой и спектральным сложением выходного пучка (МГПИ)

Номер: RU0000182596U1
Автор: Дмитрий Николаевич Мамонов, Сергей Игоревич Державин, Сергей Михайлович Климентов
Принадлежит: Дмитрий Николаевич Мамонов

Полезная модель относится к лазерной технике. Многоканальный генератор последовательных импульсов содержит заднее зеркало, активный твердотельный элемент, пассивный затвор для генерации гигантских импульсов, спектральный элемент, аналогичный компенсатору дисперсии групповых скоростей и диафрагмированный мягким пространственным селектором, выполненным из насыщающегося поглотителя, выходное зеркало, диодные модули с волоконным выходом, объектив, отображающий выходные торцы диодных модулей с волоконным выходом в объем активного элемента. В активном элементе образуются несколько близко расположенных каналов генерации. Размер каналов накачки в активном элементе должен быть меньше перетяжки основной гауссовой моды (w), характерной для резонатора на центральной длине волны генерации. Для обеспечения необходимой задержки между импульсами генерации подбираются интенсивности накачек и расстояние между центрами каналов накачки (d) в диапазоне [2w<d<3wg]. Техническим результатом является возможность упрощения процесса получения импульсов генерации с фиксированной временной задержкой и возможность объединения излучения нескольких пространственно разнесенных каналов генерации. 1 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 182 596 U1 (51) МПК H01S 3/16 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (52) СПК H01S 3/1623 (2018.02) (21)(22) Заявка: 2017133324, 25.09.2017 (24) Дата начала отсчета срока действия патента: Дата регистрации: (73) Патентообладатель(и): Мамонов Дмитрий Николаевич (RU) 23.08.2018 (56) Список документов, цитированных в отчете о поиске: BY 10301 C1, 28.02.2008. RU 2646939 C2, 12.03.2018. US 6580733 B1, 17.06.2003. RU 2101817 C1, 10.01.1998. (45) Опубликовано: 23.08.2018 Бюл. № 24 1 8 2 5 9 6 R U (54) Многоканальный генератор последовательных импульсов с регулируемой временной задержкой и спектральным сложением выходного пучка (МГПИ) (57) Реферат: Полезная модель относится к лазерной каналов генерации ...

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Номер записи: 5
19-01-2012 дата публикации

Laser irradiation apparatus

Номер: US20120012568A1
Автор: Jae-Beom Choi, Jae-Hwan Oh, Seong-Hyun Jin, Won-Kyu Lee, Young-Jin Chang
Принадлежит: Samsung Mobile Display Co Ltd

A laser irradiation apparatus for irradiating a laser beam to a semiconductor layer including a plurality of pixel areas, the apparatus includes a laser generator generating the laser beam, and an optical switching unit time-dividing the laser beam generated from the laser generator and transmitting a plurality of time-divided laser beams to a plurality of optical systems. The apparatus includes a first optical system of the plurality of optical systems that receives a first time-divided laser beam and irradiates a first laser slit beam along a first irradiation direction, and a second optical system of the plurality of optical systems that receives a second time-divided laser beam and irradiates a second laser slit beam along a second irradiation direction that is parallel with the first irradiation direction. The first laser slit beam and the second laser slit beam crystallize partial areas at a same location in the respective pixel areas.

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Номер записи: 6
19-01-2012 дата публикации

Optical amplifier and transmission loss measurement method

Номер: US20120013975A1
Автор: Miki Onaka
Принадлежит: Fujitsu Ltd

An optical amplifier that amplifies signal light with Raman amplification in the Raman amplification medium. The optical amplifier includes a light source that supplies pump light into the Raman amplification medium, a first detector that detects input power of the pump light to be input to the Raman amplification medium, a second detector that detects output power of the pump light output from the Raman amplification medium, and a processor operable to calculate transmission loss of the pump light in the Raman amplification medium by comparing the input power with the output power, and calculate transmission loss of the signal light in the Raman amplification medium based on the transmission loss of pump light corrected based on a wavelength of the signal light and a wavelength of the pump light.

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Номер записи: 7
09-02-2012 дата публикации

Laser device

Номер: US20120033687A1
Автор: Wonhee Park
Принадлежит: Jawon Medical Co Ltd

Disclosed is a laser device. The laser device includes a pulse generator which irradiates a laser beam between a high reflector mirror and an output coupler mirror to amplify and resonate the laser beam, a pulse output section which receives a laser beam pulse amplified and resonated through the output coupler mirror to output the laser beam pulse, and a Q switch which moves backward or forward in a direction perpendicular to a path of the laser beam formed between the pulse generator and the high reflector mirror. The output coupler mirror includes first and second mirrors provided on a base plate. Positions of the first and second mirrors are selectively changed as the Q switch moves backward or forward.

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Номер записи: 8
09-02-2012 дата публикации

Single longitudinal mode fiber laser apparatus

Номер: US20120033688A1
Автор: Ching-Wen Hsiao, Fu-Chun Hung, Hsiang Wang, Kai-Hsiang Hsu, Shien-Kuei Liaw
Принадлежит: National Taiwan University of Science and Technology NTUST

The present invention provides a single frequency fiber laser apparatus. The fiber laser apparatus includes a Faraday rotator mirror. A piece of erbium doped fiber is inside the laser cavity. A wavelength selective coupler is connected to the erbium doped fiber. A pump source is coupled via the wavelength selective coupler. At least one sub-ring cavity component and/or an absorb component are inserted into the cavity for facilitating suppressing laser side modes to create a single longitudinal mode fiber laser. A partial reflectance fiber Bragg grating (FBG) is used as the front cavity end for this fiber laser.

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Номер записи: 9
23-02-2012 дата публикации

Optical amplification device, communication system, and amplification method

Номер: US20120045212A1
Автор: Tomoaki Takeyama
Принадлежит: Fujitsu Ltd

According to an aspect of the invention, an amplification device includes an amplifier configured to amplify a signal light by inputting the signal light and an excitation light to a rare-earth doped amplification medium, a wavelength arrangement monitor configured to acquire wavelength arrangement information indicating a wavelength of the signal light, and a light power controller configured to control power of the input excitation light based on the acquired wavelength arrangement information.

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Номер записи: 10
01-03-2012 дата публикации

Intra-cavity second harmonic generation (shg) laser device

Номер: US20120051375A1
Автор: Fedor Karpushko
Принадлежит: Fedor Karpushko

A laser device for intra-cavity frequency conversion, in particular, for the second harmonic generation, the device comprising a laser cavity, formed by the first and the second laser cavity end reflectors wherein the said laser cavity end reflectors are highly reflective for the radiation about the laser fundamental frequency and as such provide for a predetermined level of circulating inside the cavity fundamental frequency power; an active medium provided within the said laser cavity; at least one non-linear crystal, in particular, for the second harmonic generation provided within the same laser cavity; tuning means adapted for tuning at least one of laser cavity end reflectors; wherein at least one of the laser cavity end reflectors comprises an interferometric layout providing spectrally selective reflection for the radiation about the laser fundamental frequency with the value of reflectivity nearly to 100% within a spectral range close to the free spectrum range of the laser cavity and with a sufficiently lower reflectivity outside the above spectral range such that the laser cavity restricts the spectrum of the laser radiation to a single longitudinal mode.

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Номер записи: 11
29-03-2012 дата публикации

Wavelength conversion element and apparatus for generating short wavelength light using same

Номер: US20120075690A1
Автор: Akifumi Aono, Kiminori Mizuuchi
Принадлежит: Panasonic Corp

A wavelength conversion element ( 1 ) for converting fundamental waves ( 2 ) into harmonic waves ( 3 ) having wavelengths shorter than those of the fundamental waves ( 2 ), the wavelength conversion element ( 1 ) includes a low refractive index region ( 4 ) having a refractive index lower than those of the other regions. The low refractive index region ( 4 ) is formed in the forming region of a thermal lens and is desirably formed between the light outputting side and the light collecting position of the fundamental waves ( 2 ). The wavelength conversion element ( 1 ) of the present invention includes the low refractive index region ( 4 ) that reduces a refractive power generated by the thermal lens, thereby achieving a stable output even with a high output. An apparatus for generating short wavelength light by using the wavelength conversion element ( 1 ) includes a fundamental wave light source and a light collecting optical system ( 5 ) that collects the fundamental waves.

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Номер записи: 12
31-05-2012 дата публикации

Method and system for optical conversion

Номер: US20120134013A1
Автор: Ady Arie, Gil Porat, Ofer Gayer, Zachary Sacks
Принадлежит: Individual

A cA crystal configured to change a frequency of a laser through an optical parametric oscillation (OPO) process and a difference frequency generation (DFG) process is provides. The crystal includes: an OPO/DFG segment that is quasi-periodically poled to yield (i) a conversion of a pump light applied thereto, to a first signal and an idler, and (ii) a conversion of a first signal applied thereto, to a second signal and to an idler signal, by phase-matching a difference frequency generation (DFG) process and an OPO process therein simultaneously, wherein the pump light has a frequency that equals a sum of a frequency of the first signal and a frequency of the idler and wherein the frequency of the first signal equals a sum of a frequency of the second signal and the frequency of idler.

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Номер записи: 13
14-06-2012 дата публикации

Short-pulse fiber-laser

Номер: US20120147908A1
Автор: Andrei Starodoumov, Dmitri Simanovski
Принадлежит: Coherent Inc

A mode-locked fiber laser has a resonator including a gain-fiber, a mode-locking element, and a spectrally-selective dispersion compensating device. The resonator can be a standing-wave resonator or a traveling-wave resonator. The dispersion compensating device includes only one diffraction grating combined with a lens and a minor to provide a spatial spectral spread. The numerical aperture of the gain-fiber selects which portion of the spectral spread can oscillate in the resonator.

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Номер записи: 14
28-06-2012 дата публикации

Repetition frequency control device

Номер: US20120163404A1
Автор: Akiyoshi Irisawa, Tomoyu Yamashita
Принадлежит: Advantest Corp

According to the repetition frequency control device, a master laser outputs a master laser light pulse the repetition frequency of which is controlled to a predetermined value. A slave laser outputs a slave laser light pulse. A reference comparator compares a voltage of a reference electric signal the repetition frequency of which is the predetermined value and a predetermined voltage with each other, thereby outputting a result thereof. A measurement comparator compares a voltage based on a light intensity of the slave laser light pulse and the predetermined voltage with each other, thereby outputting a result thereof. A phase difference detector detects a phase difference between the output from the reference comparator and the output from the measurement comparator. A loop filter removes a high-frequency component of an output from the phase difference detector.

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Номер записи: 15
05-07-2012 дата публикации

Remotely Induced Atmospheric Lasing

Номер: US20120170599A1
Автор: Joseph R. Penano, Marlan Scully, Phillip A. Sprangle
Принадлежит: US Department of Navy

A laser pulse from an ultrashort pulse laser (USPL) is fired into the atmosphere. The USPL pulse is configured to generate a plasma filament at a predefined target in the atmosphere, in which free, or “seed,” electrons are generated by multi-photon or tunneling ionization of the air molecules in the filament. A second pulse is fired into the atmosphere to form a heater beam that impinges on the plasma filament and thermalizes the seed electrons within the plasma filament, leading to the collisional excitation of the electrons in the filament. The excited electrons collisionally excite various electronic and vibrational states of the air molecules in the filament, causing population inversions and lasing, e.g., exciting the C 3 Π u →B 3 Π g (v=0→0) transition of the N 2 in the atmosphere to cause lasing at 337 nm.

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Номер записи: 16
05-07-2012 дата публикации

Laparoscopic Laser Device and Method

Номер: US20120172856A1
Автор: Kester Nahen
Принадлежит: AMS Research LLC

Laser radiation delivered to a treatment area may be used with a smoke suppressing irrigant. A laparoscopic laser device may include an elongate body adapted for insertion into an insufflated bodily cavity. A laser energy delivery element, at the distal end of the elongate body, may be coupleable to a source of tissue-vaporization-capable laser energy and capable of delivering laser energy along a laser energy path extending away from the laser energy delivery element. A smoke-suppressing liquid may be directed generally along the laser energy path. A remote visualization device may be used to view along the laser energy path. The laser energy path can be shrouded with a circumferentially extending suction manifold so that liquid can be suctioned from the target site and away from the laser energy path. In some examples, the suction manifold is an axially extendable and contractible suction manifold.

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Номер записи: 17
09-08-2012 дата публикации

Optical parametric oscillator pumped by femtosecond thin-disk laser

Номер: US20120200912A1
Автор: Andrei Starodoumov, Dmitri Simanovski, Norman Hodgson
Принадлежит: Coherent Inc

Pulses from a mode-locked Yb-doped laser are spectrally broadened, and temporally compressed, then frequency-doubled and used to pump an optical parametric oscillator (OPO). The OPO output is tunable over a wavelength range from about 600 nm to about 1100 nm.

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Номер записи: 18
20-09-2012 дата публикации

Laser device for exposure apparatus

Номер: US20120236885A1
Автор: Hidenori Watanabe, Hiroshi Tanaka, Osamu Wakabayashi
Принадлежит: GIGAPHOTON INC

A laser device for an exposure apparatus may include: a MOPA-type or MOPO-type laser device including a seed laser and at least one gas discharge-pumped amplifier stage that receives output light from the seed laser as an input, amplifies the light, and outputs the amplified light; and at least one of a laser gas control device that at least changes the total pressure of a laser gas in said amplifier stage in accordance with requested energy and a laser power source control device that at least changes pump intensity of discharge electrodes in said amplifier stage in accordance with said requested energy, in a case where the energy of laser output light from said laser device is to be changed discontinuously in response to a request from an exposure apparatus,

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Номер записи: 19
04-10-2012 дата публикации

Mirror for extreme ultra violet, manufacturing method for mirror for extreme ultra violet, and far ultraviolet light source device

Номер: US20120248342A1
Автор: Georg Soumagne, Masato Moriya, Osamu Wakabayashi
Принадлежит: GIGAPHOTON INC, KOMATSU LTD

An EUV light source is configured for generating an EUV light for an exposure device. The EUV light source includes a chamber, a target supply device configured for supplying a target into the chamber, an optical system for introducing laser light from a driver laser into the chamber and irradiating the target with the laser light to turn the target into plasma from which EUV light is emitted, and an EUV collector mirror in the chamber. The EUV collector mirror may include a multilayered reflecting surface with grooves and collect the EUV light from the plasma to a focal spot. The grooves can be arranged in a concentric fashion, and be configured for diffracting at least light at a wavelength which is the same as that of the laser light from the driver laser.

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Номер записи: 20
25-10-2012 дата публикации

Laser characterization system and process

Номер: US20120268743A1
Автор: Chung-En Zah, Feng Xie, Gerard P. Wysocki, Yin Wang
Принадлежит: Corning Inc, PRINCETON UNIVERSITY

A system and process for automatically characterizing a plurality of external cavity semiconductor laser chips on a semiconductor laser bar separated from a semiconductor wafer. The system includes a diffraction grating and a steering mirror mounted on a rotary stage for rotating the diffraction grating through a range of diffraction angles. A laser bar positioning stage for automatically aligning each laser chip in a laser bar with the diffraction grating. Reflecting a laser beam emitted from a laser chip in a laser bar with diffraction grating and steering mirror to the laser analyzer. Automatically rotating the diffraction grating through a range of diffraction angles relative to the laser beam and automatically characterizing the laser optical properties such as spectra, power, or spatial modes with the laser analyzer at each diffraction angle.

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Номер записи: 21
25-10-2012 дата публикации

Optical Source with Remote Optical Head Outputting High Power Short Optical Pulses

Номер: US20120268808A1
Автор: Anatoly Borisovich Grudinin, Ian Michael Godfrey, John Redvers Clowes, Kestutis Vysniauskas
Принадлежит: Fianium Ltd

An optical source can include a remote optical head for outputting high power short optical pulses. The optical source can include signal source operable to output short optical pulses; an optical pump light source; an optical head provided at a location remote from the location of the optical signal source; and an optical fibre amplifier having at least its optical output located within the optical head. The source can also include an optical signal delivery fibre arranged to deliver optical pulses from the optical signal source to the optical fibre amplifier and a pump light delivery fibre arranged to deliver optical pump light to the high power optical fibre amplifier. In use short optical pulses of a first optical power are delivered to the optical fibre amplifier and are amplified therein to a higher optical power for output from the optical head

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Номер записи: 22
25-10-2012 дата публикации

Thulium and/or Holmium Doped Germanosilicate Glasses for Two Micron Lasers

Номер: US20120269210A1
Автор: Shibin Jiang, Tao Luo
Принадлежит: Individual

A laser glass fiber with a core of the fiber comprising a germanosilicate glass host, one or more glass network modifiers, one or more glass network intermediators, and Thulium ions, Holmium ions, or a combination of Thulium ions and Holmium ions. The fiber emits laser light from 1.7 micron to 2.2 micron.

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Номер записи: 23
01-11-2012 дата публикации

Titanium-doped amorphous aluminum nitride microlaser device and method for making and using same

Номер: US20120274944A1
Автор: Kyle Main, Muhammad Maqbool
Принадлежит: BALL STATE UNIVERSITY BOARD OF TRUSTEES

A microlaser system, including a microlaser, having an elongated generally cylindrical substrate, a thin dopant film encircling at least a portion of the substrate, and a pumping laser positioned to shine onto the thin film. The thin film is between about 2 and about 10 microns thick. When the pumping laser shines on the thin film, the thin film lases in whispering gallery mode. The dopant is preferably selected from the group including transition metals and rare-earth elements. In a most preferred embodiment, the thin film is titanium-doped amorphous aluminum nitride.

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Номер записи: 24
01-11-2012 дата публикации

Method and apparatus for generation and amplification of light in a semi-guiding high aspect ratio core fiber

Номер: US20120275475A1
Автор: Alexander A. Betin, David A. Rockwell, Vladimir V. Shkunov
Принадлежит: Raytheon Co

A planar laser gain medium and laser system. The novel laser gain medium includes an active core having a high aspect ratio cross-section with a fast-axis dimension and a slow-axis dimension, signal claddings adapted to form reflective boundaries at fast-axis boundaries of the core, and a material adapted to minimize reflections at slow-axis boundaries of the core. In an illustrative embodiment, the laser gain medium is an optical fiber. The core and claddings form a waveguide adapted to control modes propagating in the fast-axis direction. When the laser gain medium is employed as a laser oscillator, a high reflectivity mirror and an outcoupler are positioned at opposite ends of the core to form a laser resonator adapted to control modes in the slow-axis direction.

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Номер записи: 25
22-11-2012 дата публикации

Generation of single optical tone, RF oscillation signal and optical comb in a triple-oscillator device based on nonlinear optical resonator

Номер: US20120294319A1
Автор: Andrey Matsko, Lute Maleki
Принадлежит: Oewaves Inc

Techniques and devices based on optical resonators made of nonlinear optical materials to form triple-oscillator devices for generating a single optical tone, a radio frequency (RF) oscillation signal and an optical frequency comb signal having different optical frequencies.

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Номер записи: 26
06-12-2012 дата публикации

Light source apparatus and processing method

Номер: US20120305806A1
Автор: Motoki Kakui, Shinobu Tamaoki
Принадлежит: Sumitomo Electric Industries Ltd

The present invention relates to a light source apparatus. The light source apparatus has an MOPA configuration and comprises a seed light source, a pulse generator, an intermediate optical amplifier, a final stage optical amplifier, a delivery optical fiber, and a light output terminal. The delivery optical fiber is a PBG fiber having a photonic bandgap (PBG) structure in a core-surrounding portion located around the core. Light with a wavelength in a high loss band of the PBG fiber is inputted into the PBG fiber.

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Номер записи: 27
27-12-2012 дата публикации

Compact optical frequency comb systems

Номер: US20120327959A1
Автор: Ingmar Hartl, Martin E. Fermann, Thomas R. SCHIBLI
Принадлежит: IMRA America Inc

Compact optical frequency sources are described. The comb source may include an intra-cavity optical element having a multi-material integrated structure with an electrically controllable active region. The active region may comprise a thin film. By way of example, the thin film and an insulating dielectric material disposed between two electrodes can provide for rapid loss modulation. In some embodiments the thin film may comprise graphene. In various embodiments of a frequency comb laser, rapid modulation of the CEO frequency can be implemented via electric modulation of the transmission or reflection loss of an additional optical element, which can be the saturable absorber itself. In another embodiment, the thin film can also be used as a saturable absorber in order to facilitate passive modelocking. In some implementations the optical element may be formed on a cleaved or polished end of an optical fiber.

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Номер записи: 28
27-12-2012 дата публикации

Mode-locked fiber laser based on narrowband optical spectral filtering and amplifier similaritons

Номер: US20120327960A1
Автор: Andy Chong, Frank Wise, William Renninger
Принадлежит: CORNELL UNIVERSITY

Implementations and examples of mode-locked fiber lasers based on fiber laser cavity designs that produce self-similar pulses (“similaritons”) with parabolic pulse profiles with respect to time at the output of the fiber gain media to effectuate the desired mode locking operation. An intra-cavity narrowband optical spectral filter is included in such fiber lasers to ensure the proper similariton conditions.

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Номер записи: 29
14-02-2013 дата публикации

Pulse fiber laser device

Номер: US20130038924A1
Автор: Kodai Fukazawa, Masatoshi Fujimoto
Принадлежит: Hamamatsu Photonics KK

A pulse fiber laser device 1 has a Fabry-Perot type optical resonator, and is provided with an excitation light source 11 , an optical coupling unit 12 , an amplifying optical fiber 13 , a saturable absorber 14 , a gradient index lens 15 , an optical output unit 16 , a dispersion adjusting unit 17 , a mirror 21 and a mirror 22 . The saturable absorber 14 and the mirror 21 , integrated into one body, constitute a saturable absorber mirror 23 . The gradient index lens 15 converges the light output from an end face of an optical fiber 32 and outputs the light to the saturable absorber mirror 23 , and inputs the light reflected from the saturable absorber mirror 23 into the end face of the optical fiber 32 . Thus, there is provided a pulse fiber laser device that enables easy adjustment of the intensity of light incident on a saturable absorber and facilitates miniaturization.

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Номер записи: 30
14-02-2013 дата публикации

Gas laser apparatus equipped with power calculation unit

Номер: US20130039377A1
Автор: Satoshi Kagiwada, Yoshitaka Kubo
Принадлежит: FANUC Corp

Disclosed is a gas laser apparatus having: a first estimation unit which calculates an estimate of input power to the laser power supply device by using the output current value and output voltage value of the DC power supply unit and also using the efficiency of conversion from input power to output power by the DC power supply unit; a second estimation unit which calculates an estimate of input power to the driving device by using the output current value of the driving device; and a power calculation unit which calculates the power consumption value of the gas laser apparatus, based on the estimate of the input power to the laser power supply device and the estimate of the input power to the driving device.

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Номер записи: 31
21-02-2013 дата публикации

Frequency-chirped semiconductor diode laser phase-locked optical system

Номер: US20130044770A1
Автор: George Rakuljic
Принадлежит: George Rakuljic

A chirped diode laser (ChDL) is employed for seeding optical amplifiers and/or dissimilar optical paths, which simultaneously suppresses stimulated Brillouin scattering (SBS) and enables coherent combination. The seed spectrum will appear broadband to suppress the SBS, but the well-defined chirp will have the coherence and duration to allow the active phasing of multiple amplifiers and/or dissimilar optical paths. The phasing is accomplished without optical path-length matching by interfering each amplifier output with a reference, processing the resulting signal with a phase lock loop, and using the error signal to drive an acousto-optic frequency shifter at the front end of each optical amplifier and/or optical path.

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Номер записи: 32
14-03-2013 дата публикации

Method and Apparatus for Suppression of Stimulated Brillouin Scattering Using Polarization Control with A Birefringent Delay Element

Номер: US20130063808A1
Автор: Joshua E. Rothenberg
Принадлежит: Northrop Grumman Systems Corp

A method and apparatus for suppression of stimulated Brillouin scattering (SBS) includes a master oscillator (MO) that generates a beam; a birefringent element that receives and transmits the beam, wherein the beam is transmitted with a transmission delay between two orthogonal axes; a polarization controller that receives the beam and transmits the beam with a desired polarization; a fiber amplifier that receives the beam, amplifies the beam, and transmits a beam; a compensating birefringent element that receives the beam, approximately removes the transmission delay between the two axes of the beam, and transmits an output beam; and a polarization detector that detects the output beam's polarization and provides feedback to the polarization controller to ensure that the polarization of the output beam is approximately equal to a desired output polarization, so as to reduce SBS.

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Номер записи: 33
04-04-2013 дата публикации

Narrow linewidth brillouin laser

Номер: US20130083813A1
Автор: Arthur H. Hartog
Принадлежит: Schlumberger Technology Corp

A Brillouin laser having a narrowed linewidth, reduced relative intensity noise, and increased output power includes a pump laser that provides pump energy to an optical fiber resonant cavity to stimulate Brillouin emission. The output of pump laser is stabilized and its linewidth is narrowed by locking the frequency and phase of the optical signal generated by the pump laser to a longitudinal mode of the optical fiber resonant cavity. In addition, the resonant cavity is temperature and/or strain-tuned so that the Brillouin gain is substantially centered on a longitudinal mode of the cavity, thereby ensuring that the Brillouin frequency shift is substantially equal to an integer number of the free spectral range of the cavity.

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Номер записи: 34
04-04-2013 дата публикации

LASER SYSTEM WITH NONLINEAR COMPRESSION

Номер: US20130083814A1
Автор: Limpert Jens, Nodop Dirk, Steinmetz Alexander, Tuennermann Andreas
Принадлежит:

The invention relates to a laser system with a passively Q-switched laser a spectrally widening element and a compression element Laser systems of this kind are utilized for generating ultra-short laser pulses. Systems, mode-coupled solid-state lasers known from prior art allow for generating laser pulses in the sub-10 ps range only with complicated and alignment-sensitive free-beam arrangements. Therefore, it is the object of the present invention to create a laser system that generates pulse durations of less than 10 ps and which is simple and compact to produce at the same time. In order to achieve this object, the present invention proposes that the passively Q-switched laser is provided with a longitudinally monomode output radiation which is spectrally widened by means of the spectrally widening element by self-phase modulation and is temporally compressed by the compression element 1134134. Laser system with a passively Q-switched laser () , a spectrally widening element () , and a compression element () , wherein the passively Q-switched laser () has a longitudinally monomode output radiation which is spectrally widened by means of the spectrally widening element () by self-phase modulation and is temporally compressed by the compression element ().21. Laser system according to claim 1 , wherein the passively Q-switched laser () is a microchip laser.31. Laser system according to claim 2 , wherein the microchip laser () is comprised of a neodymium-endowed vanadate crystal and a saturable semiconductor mirror.41. Laser system according to claim 1 , wherein the passively Q-switched laser () has a pulse duration of less than 1 ns.51. Laser system according to claim 1 , wherein the passively Q-switched laser () has a pulse duration of less than 200 ps.61. Laser system according to claim 1 , wherein the passively Q-switched laser () has a pulse duration of less than 50 ps.73. Laser system according to claim 1 , wherein the spectrally widening element () is an ...

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Номер записи: 35
25-04-2013 дата публикации

PUMP ABSORPTION AND EFFICIENCY FOR FIBER LASERS/AMPLIFIERS

Номер: US20130100972A1
Автор: Creeden Daniel J.
Принадлежит: BAE Systems Information and Electric Systems Integration Inc.

Techniques are disclosed for improving pump absorption and efficiency for fiber lasers and amplifiers, for instance. In some embodiments, the techniques are implemented by applying a partially reflective coating on a fiber end-face to double-pass any unabsorbed or otherwise excess pump light in the cladding of a fiber. While being reflective to pump wavelengths, the coating can be non-reflective at the lasing wavelength, so as to avoid unwanted feedback into the system. The benefits of this approach include that excess pump power can be effectively utilized to add more power to the laser output. In addition, the double-pass technique allows for the use of a shorter fiber length, which in turn allows for more compact system designs, saves on material costs, and facilitates manufacturability. 1. An optical fiber comprising:a fiber core;a first cladding surrounding the core;an outer cladding surrounding the first cladding, wherein the outer cladding has a lower index of refraction than the first cladding; anda partial reflector applied to a fiber-to-free-space interface associated with the fiber, wherein the partial reflector is reflective at pump light wavelengths and antireflective at core light wavelengths.2. The optical fiber of claim 1 , wherein the partial reflector is configured to double-pass any unabsorbed pump light back through the first cladding.3. The optical fiber of or claim 1 , wherein the length of the optical fiber is determined based on optimal double-pass absorption of pump light.4. The optical fiber of any of the preceding claims claim 1 , wherein the partial reflector is applied to a tip of the optical fiber.5. The optical fiber of any of the preceding claims claim 1 , wherein a tip of the optical fiber is coated by the partial reflector.6. The optical fiber of any of the preceding claims claim 1 , wherein the partial reflector is applied to a tip of the optical fiber using a fiber connector claim 1 , and connectorization adhesive does not strip ...

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Номер записи: 36
23-05-2013 дата публикации

Laser oscillation apparatus

Номер: US20130128906A1
Автор: Junji Urakawa, Yosuke Honda
Принадлежит: Inter University Research Institute Corp High Energy Accelerator Research Organization

Provided is a laser oscillation apparatus capable of stabilizing resonance even when finesse of an optical resonator is increased and generating stronger laser light than that of a traditional apparatus by accumulating laser light in the optical resonator. The laser oscillation apparatus includes a laser light source which generates laser light for excitation, a fiber amplifier which generates laser light with a desired wavelength when the laser light generated at the laser light source for excitation is supplied, an optical resonator, an optical isolator which is interposed between the optical resonator and the fiber amplifier and which guides the laser light from the fiber amplifier to one side of the optical resonator while blocking laser light in the opposite direction, a circulation optical path which accelerates resonance as introducing laser light emitted from the other side of the optical resonator and returning the laser light to the optical resonator via the fiber amplifier and the optical isolator, and a modulator which performs amplitude modulation on the laser light in the circulation optical path.

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Номер записи: 37
13-06-2013 дата публикации

OPTICAL SCANNING AND IMAGING SYSTEMS BASED ON DUAL PULSED LASER SYSTEMS

Номер: US20130148128A1
Автор: FERMANN Martin E., HARTL Ingmar
Принадлежит: IMRA AMERICA, INC.

The invention relates to scanning pulsed laser systems for optical imaging. Coherent dual scanning laser systems (CDSL) are disclosed and some applications thereof. Various alternatives for implementation are illustrated, including highly integrated configurations. In at least one embodiment a coherent dual scanning laser system (CDSL) includes two passively modelocked fiber oscillators. The oscillators are configured to operate at slightly different repetition rates, such that a difference δfin repetition rates is small compared to the values fand fof the repetition rates of the oscillators. The CDSL system also includes a non-linear frequency conversion section optically connected to each oscillator. The section includes a non-linear optical element generating a frequency converted spectral output having a spectral bandwidth and a frequency comb comprising harmonics of the oscillator repetition rates. A CDSL may be arranged in an imaging system for one or more of optical imaging, microscopy, micro-spectroscopy and/or THz imaging. 1. A coherent dual scanning laser system , comprising:{'sub': r', 'r1', 'r2, 'first and second passively modelocked fiber oscillators, each of said first and second oscillators arranged with intra-cavity dispersion compensation and to operate at slightly different repetition rates, such that a difference Δfin repetition rates is small compared to the values fand fof the respective repetition rates of said first and second oscillators, said first and second oscillators producing respective first and second pulse trains;'}a first optical splitter to spatially split and direct said first pulse train along a plurality of optical paths, including a first frequency conversion path; a first non-linear frequency converter disposed downstream from said first passively modelocked fiber oscillator and optically connected to said first passively modelocked fiber oscillator, said first non-linear frequency converter disposed in said first frequency ...

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Номер записи: 38
13-06-2013 дата публикации

WAVELENGTH MONITOR, WAVELENGTH LOCKABLE LASER DIODE AND METHOD FOR LOCKING EMISSION WAVELENGTH OF LASER DIODE

Номер: US20130148676A1
Автор: Edwards Phillip, FUKUDA Chie, Kaneko Toshimitsu, Thompson Lance
Принадлежит: Sumitomo Electric Industries, Ltd.

A wavelength monitor monolithically integrated with a tunable LD is disclosed. The wavelength monitor includes at least two filters, each having a periodic transmission spectrum but a period between nearest neighbor periods is different from the other. A transmittance of the first filter and another transmittance of the second filter at a grid wavelength attributed to the WDM system forms a combination which is specific to the grid wavelength but different from other combinations at other grid wavelengths. 1. A wavelength monitor integrated with a tunable LD to form a wavelength lockable LD , comprising:a first optical filter to transmit light generated by the tunable LD, the first optical filter having a first transmittance spectrum periodically varying in a wavelength range of a WDM system; anda second optical filter to transmit light generated by the tunable LD, the second optical filter having a second transmittance spectrum periodically varying in the wavelength range of the WDM system,wherein the first transmittance spectrum and the second transmittance spectrum at a grid wavelength of the WDM system have a combination in respective transmittances specific to the grid wavelength different from combinations of respective transmittances at other grid wavelengths of the WDM system.2. The wavelength monitor of claim 1 ,wherein at least one of the first optical filter and the second optical filter has an arrangement of a Mach-Zender filter.3. The wavelength monitor of claim 1 ,wherein at least one of the first optical filter and the second optical filter has an arrangement of a ring filter.4. The wavelength monitor of claim 1 ,wherein the transmittance of the first transmittance spectrum at respective grid wavelengths of the WDM system is substantially constant,wherein the transmittance of the second transmittance spectrum at respective grid wavelengths monotonically varies within the wavelength range of the WDM system.5. The wavelength monitor of claim 4 ,wherein ...

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Номер записи: 39
20-06-2013 дата публикации

WALK-OFF COMPENSATOR WITH TILT FUNCTION

Номер: US20130155493A1
Автор: Owen Joseph M., RINES Nathan E.
Принадлежит: BAE Systems Information and Electronic Systems Integration Inc.

Techniques and structure are disclosed for implementing a spatial walk-off compensation mechanism having an integral tilt function. In some embodiments, the mechanism may comprise a tilt-ball mount having an integrated walk-off compensation medium. In some embodiments, the mechanism may be configured to receive an output beam from a non-linear converter (e.g., optical parametric oscillator or OPO) implementing a non-linear medium comprising a bi-refringent material (e.g., zinc germanium phosphide, or ZnGeP; cadmium silicon phosphide, or CdSiP). In some embodiments, the walk-off compensation medium may comprise the same material and/or have the same cut as the non-linear medium. In some embodiments, the mechanism may he manually and/or mechanically adjusted/repositioned to reduce beam walk-off and/or to more precisely direct the beam. In some embodiments, the mechanism may be implemented in mid-infrared (MIR) applications. Numerous configurations and variations will be apparent in light of this disclosure. 1. An apparatus comprising:a tilt-ball mount having a through-hole aperture formed therein; anda walk-off compensation medium, wherein at least a portion of the walk-off compensation medium is disposed within the through-hole aperture of the tilt-ball mount2. The apparatus of claim 1 , wherein the tilt-ball mount has a geometry that is spherical claim 1 , cylindrical claim 1 , ellipsoidal claim 1 , polyhedral claim 1 , or prismatic.3. The apparatus of claim 1 , wherein the tilt-bail mount is configured to be tilted and/or rolled.4. The apparatus of claim 1 , wherein the walk-off compensation medium comprises a zinc germanium phosphide (ZnGeP) crystal or a cadmium silicon phosphide (CdSiP) crystal.5. The apparatus of claim 1 , wherein the walk-off compensation medium has a geometry that is polyhedral claim 1 , prismatic claim 1 , or cylindrical.6. The apparatus of claim 1 , wherein the apparatus is configured to receive a beam from a non-linear converter and to ...

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Номер записи: 40
27-06-2013 дата публикации

Parametric generator

Номер: US20130163070A1
Автор: Cameron Francis Rae, David Alan Walsh, David James Mark Stothard, Malcolm Harry Dunn
Принадлежит: University of St Andrews

A method of optimizing parametric gain in a nonlinear optical crystal that in response to application of a pump beam generates through a parametric generation process signal and idler beams, wherein the signal beam is non-collinear with the pump beam and the signal beam is subject to absorption due to the nonlinear material, the method involving shaping the pump beam to have an elliptical cross section, wherein the method further involves determining the width w of the pump beam depending on the absorption co-efficient of the optical crystal.

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Номер записи: 41
04-07-2013 дата публикации

P-ELEMENT DOPED LASER MEDIUM APPARATUS AND METHOD

Номер: US20130167595A1
Автор: Alfano Robert R., Bykov Alexel, Sharonov Mikhail
Принадлежит:

A method for manufacturing a glass composition including a host glass, a 3p component having a concentration of about 5 mole percent to about 10 mole percent, and at least one of a 6p component having a concentration of about 1 mole percent to about 5 mole percent and a 5p component having a concentration of about 1 mole percent to about 5 mole percent, is provided. The method includes heating the host glass to a first predetermined temperature for a first period of time; mixing a powder including the 3p component and the at least one of the 5p component and the 6p component with the heated host glass into a glass/powder mixture; heating the glass/powder mixture to a second predetermined temperature for a second period of time; and cooling, after heating, the glass/powder mixture. 1. A method for manufacturing a glass composition including a host glass , a 3p component having a concentration of about 5 mole percent to about 10 mole percent , and at least one of a 6p component having a concentration of about 1 mole percent to about 5 mole percent and a 5p component having a concentration of about 1 mole percent to about 5 mole percent , the method comprising:heating the host glass to a first predetermined temperature for a first period of time;mixing a powder including the 3p component and the at least one of the 5p component and the 6p component with the heated host glass into a glass/powder mixture;heating the glass/powder mixture to a second predetermined temperature for a second period of time; andcooling, after heating, the glass/powder mixture.2. The method of claim 1 , wherein the host glass is heated to about 950° C. for about 20 hours.3. The method of claim 1 , wherein the glass/powder mixture is heated to about 1450° C. for about 1 hour. This application is a Divisional Application of U.S. patent application Ser. No. 13/026,869 filed in the U.S. Patent and Trademark Office on Feb. 14, 2011, and this application claims priority to U.S. Provisional Patent ...

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Номер записи: 42
11-07-2013 дата публикации

Tunable Pulse Width Laser

Номер: US20130177031A1
Автор: Almeida Paulo, Clowes John Redvers, Dupriez Pascal, Grudinin Anatoly Borisovich
Принадлежит:

A method of tuning the time duration of laser output pulses, the method including spectrally dispersing optical pulses and further comprising providing an optical pulse having a time duration and a spectral bandwidth; spectrally dispersing () the optical pulse so as to provide a selected change in the time duration of the pulse responsive to the spectral band-width of the pulse; outputting () an optical output pulse having a first time duration that is responsive to the selected change in time duration; providing another optical pulse; changing the amount of spectral bandwidth of the another optical pulse () to be different than that of the optical pulse or changing the amount of spectral dispersion so that spectrally dispersing the another optical pulse provides a change in time duration that is different than the selected change; and outputting () another optical output pulse having a second time duration that is responsive to the different change in time duration, the second time duration of the another optical output pulse being different than the first time duration of the optical output pulse. 1. A method of tuning the time duration of output pulses output from a laser system , wherein the method comprises spectrally dispersing optical pulses and further comprises:providing an optical pulse having a time duration and a spectral bandwidth;spectrally dispersing the optical pulse so as to provide a selected change in the time duration of the pulse responsive to the spectral bandwidth of the pulse;outputting an optical output pulse from the laser system having a first time duration that is responsive to the selected change in time duration;providing another optical pulse;changing the amount of spectral bandwidth of the another optical pulse to be different than that of the optical pulse or changing the amount of spectral dispersion so that spectrally dispersing the another optical pulse provides a change in time duration that is different than the selected change; ...

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Номер записи: 43
18-07-2013 дата публикации

PRODUCES VARIOUS TYPES OF PULSES BY CONTROLLING THE DISTANCE BETWEEN THE SATURABLE ABSORBER CONNECTORS

Номер: US20130182726A1
Автор: CHOI Jin Doo, JO Seung Hwan, KIM Jin Hwan, KIM Kyung-Soo, Kim Soo Hyun, Kwon Won Sik, Lee Hyub, Lee Sang Wook, OH Seung Ryeol, Ryu Sung Yoon
Принадлежит: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Provided is a device of generating various types of pulses by controlling a distance between saturable absorber connectors, and more particularly, a device of generating various types of pulses by controlling a distance between saturable absorber connectors, capable of actively controlling a distance between saturable absorbers to completely overcome a disadvantage that an opened space is present in a cavity or a disadvantage that a fiber component should be changed and implementing a simple design of the entire fiber laser cavity since only a saturable absorber part, which is a portion of a fiber laser cavity, should be designed, as a carbon nanotube saturable absorber part in a passively mode-locked fiber laser generating apparatus using the saturable absorber. 1. A device of generating various types of pulses by controlling a distance between saturable absorber connectors , the device comprising:{'b': 500', '100', '110', '120', '200', '100', '300', '200', '200, 'a saturable absorber moving unit including a saturable absorber mounting part having one portion to which a saturable absorber is coupled and the other portion to which a fiber is coupled, a fiber fixing part having one portion to which the saturable absorber mounting part is coupled, and a micro driving part coupled to the other portion of the fiber fixing part to horizontally move the fiber fixing part ;'}{'b': 600', '100', '110', '120', '200', '100', '500, 'a saturable absorber fixing unit including a saturable absorber mounting part having one portion to which a saturable absorber is coupled and the other portion to which a fiber is coupled and a fiber fixing part having one portion to which the saturable absorber mounting part is coupled, and fixed to be spaced apart from the saturable absorber moving unit by a predetermined distance; and'}{'b': 700', '500', '600, 'a fiber connecting unit provided between the saturable absorber moving unit and the saturable absorber fixing unit to be fixed.'} ...

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Номер записи: 44
18-07-2013 дата публикации

LASER PROCESSING APPARATUS

Номер: US20130182727A1
Автор: Matsumoto Akihisa, Tahara Akihiro, Yamazaki Naoya
Принадлежит:

A laser marking apparatus is provided with a laser emission unit that emits laser beam and a laser radiation unit that is detachably connected to the laser emission unit. The laser radiation unit radiates the laser beam emitted from the laser emission unit toward an object to be processed. A projection, which projects rearward, is formed on a part of the laser radiation unit that is connected with the laser emission unit. A recess is provided in a part of the laser emission unit that is connected with the laser radiation unit. The projection can fit into the recess. The recess is opened forward, backward, to lateral sides, and downward. 110-. (canceled)11. A laser processing apparatus comprising:a laser oscillation portion;a laser emission unit including an emission optical system that emits a laser beam oscillated by the laser oscillation portion;a laser radiation unit that is detachably connected to the laser emission unit and has a radiation optical system for radiating the laser beam emitted from the laser emission unit to an object to be processed;a first connection portion provided in a part of the laser emission unit that is connected to the laser radiation unit;a second connection portion provided in a part of the laser radiation unit that is connected to the laser emission unit;a projection provided on a lower end portion of one of the first connection portion and the second connection portion, the projection protruding along an optical axis of the laser beam; anda recess provided on a lower end portion of the other one of the first connection portion and the second connection portion, whereinthe recess can fit the projection and slideably guide the projection along the optical axis, andthe recess is open in a direction facing at least the projection in an optical axis direction and downward in a direction intersecting the optical axis.12. The laser processing apparatus according to claim 11 , further comprising a main unit that has the laser oscillation ...

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Номер записи: 45
18-07-2013 дата публикации

Fast Wavelength Switching

Номер: US20130182731A1
Автор: Carter Andrew Cannon, Whitbread Neil David
Принадлежит: OCLARO TECHNOLOGY LIMITED

There is described a laser assembly for providing light at a switchable output wavelength. The assembly comprises first and second tuneable lasers, each configurable to emit light at a laser wavelength chosen from a range of wavelengths. Light is transmitted from the first laser while the second laser is retuned to change the chosen laser wavelength thereof. Each laser comprises one or more thermally sensitive control components for controlling the operation of the laser and an additional component electrode located adjacent to at least one of the one or more control components. The laser is configured so that the sum of electrical currents supplied to each control component and its corresponding additional component remains substantially constant in use. 1. A laser assembly for providing light at a switchable output wavelength , comprising first and second tuneable lasers , each configurable to emit light at a laser wavelength chosen from a range of wavelengths , wherein:the assembly is configured to transmit light from the first laser while the second laser is retuned to change the chosen laser wavelength thereof; and one or more thermally sensitive control components for controlling the operation of the laser; and', 'an additional component electrode located adjacent to at least one of the one or more control components and configured so that the sum of electrical currents supplied to each control component and its corresponding additional component electrode remains substantially constant in use., 'each laser comprises2. The assembly of claim 1 , configured to switch the output wavelength by switching to transmission of light from the second laser at the changed laser wavelength.3. The assembly of claim 2 , configured so that claim 2 , while the light from the second laser is transmitted claim 2 , the first laser is retuned so as to change the laser wavelength thereof.4. The assembly of claim 3 , wherein each additional component electrode is located within ...

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Номер записи: 46
01-08-2013 дата публикации

Laser Puncher for Punching Hole on Tipping Paper in a Curved Manner

Номер: US20130193120A1
Автор: Lu Feixing, Min Dayong, Zhang Xiangming
Принадлежит: WUHAN HUAGONG LASER ENGINEERING CO., LTD.

The present invention discloses a laser puncher for punching holes on tipping paper in a curve manner, which comprises a panel, a light guiding cylinder, a laser connected with the light guiding cylinder, a transmission system driving a piece of tipping paper to move and at least one focusing optical head and at least one driving motor is fixed on the panel, a screw shaft is connected with the driving shaft of the driving motor, a nut is connected with the screw shaft and fixedly connected with a connecting rod, the other end of which is fixedly connected with at least one moving optical cylinder, one end of which is provided with the light guiding cylinder, and the other end of which penetrates the panel to be fixedly connected with the focusing optical head, the external periphery of the moving optical cylinder is provided with an anti-rotation linear bearing, which is fixed on the panel, and the driving motor drives the focusing optical head to reciprocate back and forth via the screw shaft, the nut, the connecting rod and the moving optical cylinder. The present invention can increase the identifiability of tipping papers on which holes are punched with a laser puncher as well as the air permeability of tipping papers. 1. A laser puncher for punching holes on tipping paper in a curved manner , comprising;a panel;a light guiding cylinder;a laser connected with the light guiding cylinder;a transmission system driving a piece of tipping paper to move; andat least one focusing optical head, wherein at least one driving motor is fixed on the panel, a screw shaft is connected with the driving shaft of the driving motor, a nut is connected with the screw shaft and fixedly connected with a connecting rod, the other end of which is fixedly connected with at least one moving optical cylinder, one end of which is fitted glidingly in the light guiding cylinder, and the other end of which penetrates the panel to be fixedly connected with the focusing optical head, the ...

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Номер записи: 47
01-08-2013 дата публикации

Lithographic Apparatus and Device Manufacturing Method

Номер: US20130194562A1
Автор: Hendrik Antony Johannes Neerhof, Markus Franciscus Antonius Eurlings
Принадлежит: ASML Netherlands BV

A lithographic apparatus comprising a source of EUV radiation, an illumination system configured to condition a radiation beam, and a projection system configured to project the radiation beam onto a substrate, wherein the apparatus further comprises a filter configured to prevent or reduce the transmission of unwanted radiation and an apparatus configured to detect damage of the filter, wherein the damage detection apparatus comprises an antenna configured to receive radio waves and an analysis apparatus configured to determine the presence of filter damage based upon the received radio waves.

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Номер записи: 48
01-08-2013 дата публикации

APPARATUS FOR SHAPING THE LIGHT RAYS OF A LASER BEAM

Номер: US20130194673A1
Автор: BERNARD Eric, ENGEL Thierry, VETTER Pierre-Alain
Принадлежит: IREPA LASER

The present disclosure relates to a shaping device for light rays of a laser beam that cross it, wherein the shaping device is formed by a conduit including an entry orifice, an exit orifice, and an internal wall, achieved by one or a plurality of facets adapted to reorient by at least one reflection at least a part of the rays of the crossing beam. 1. A shaping device for light rays of a laser beam that crosses it , formed by a conduit , comprisingan entry orifice;an exit orifice; andan internal wall, achieved by one or a plurality of facets, adapted to reorient by at least one reflection at least a part of the light rays of the crossing beam.2. The shaping device for light rays of a laser beam according to claim 1 , wherein at least one geometric characteristic of the shaping device is arranged depending on at least one characteristic of the laser beam to reorient the part of the light rays located on a periphery of the laser beam claim 1 , such that a relationship between this part and a surface of a section of the laser beam defines optical claim 1 , geometric claim 1 , and energy properties of the laser beam upon exiting from the shaping device claim 1 , the geometric characteristics of the shaping device being contained in a list including at least:a size (Le) of an aperture of the entry orifice of the shaping device,a size (Lo) of an aperture of the exit orifice of the shaping device,a shape of the exit orifice of the shaping devicea length (L) of the shaping device,a position of a focal point (Lp) of the laser beam at the entry orifice of the shaping device,a focus angle (α) of the laser beam at the entry orifice of the shaping device,a shape of the conduit performing as a waveguide.3. The shaping device for light rays of a laser beam according to claim 1 , wherein the shaping device is arranged to allow only one single and unique reflection to the part of the light rays of the crossing beam reflected by the shaping device.4. The shaping device for light ...

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Номер записи: 49
01-08-2013 дата публикации

LASER LIGHT EMITTING DEVICE AND METHOD OF MANUFACTURING THE SAME, AND FIBER LASER APPARATUS USING THE SAME

Номер: US20130195127A1
Автор: Sakamoto Shinichi
Принадлежит: FUJIKURA LTD.

The laser light emitting device includes a glass rod having an input end and an output end. The glass rod has a core provided along the central axis thereof and a cladding covering the core. The refractive index of the core on the side of the input end is higher than the refractive index of the cladding. A value given through subtraction of the refractive index of the cladding from the refractive index of the core on the side of the output end is smaller than a value given through subtraction of the refractive index of the cladding from the refractive index of the core on the side of the input end. 1. A laser light emitting device , comprising:a glass rod including an input end and an output end, the glass rod having a core provided along a central axis thereof and a cladding covering the core, whereinthe core and the cladding are adapted such that the core has a higher refractive index than the cladding on the side of the input end, and thata value given through subtraction of the refractive index of the cladding from the refractive index of the core on the side of the output end is smaller than a value given through subtraction of the refractive index of the cladding from the refractive index of the core on the side of the input end, and whereinthe refractive index of the core on the output end side is adapted to be equal to or lower than the refractive index of the cladding.2. The laser light emitting device according to claim 1 , whereinthe area in which the core has a gradually lowering refractive index is adapted to be longer than the wavelength of laser light to be input.3. A fiber laser apparatus claim 1 , comprising:an optical fiber that has a core and is configured to output laser light; and{'claim-ref': [{'@idref': 'CLM-00001', 'claim 1'}, {'@idref': 'CLM-00002', '2'}], 'the laser light emitting device according to or , the laser light emitting device having a larger diameter than the core of the optical fiber, wherein'}the output end for the laser light ...

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Номер записи: 50
01-08-2013 дата публикации

METHOD FOR DETERMINING SATURATED ABSORPTION LINES AND LASER FREQUENCY STABILIZING DEVICE

Номер: US20130195132A1
Автор: OOZEKI Hidekazu, YANO Ryunosuke
Принадлежит: MITUTOYO CORPORATION

A method for determining saturated absorption lines includes defining first and second threshold values based on an output value of a light output signal. The first and second threshold values are in a magnitude relationship. An output value of a second-order differential signal of the light output signal is compared with the first and second threshold values. A determination is made as to whether the second-order differential signal following a change in a resonator length has an output waveform that displays a behavior in which the output waveform changes from less than the second threshold value to be equal to or greater than the first threshold value, and then changes to be less than the second threshold value. Based on a result of the determination by the waveform determination, a determination is made as to whether the output waveform of the second-order differential signal is the saturated absorption line. 1. A method for determining saturated absorption lines for a laser frequency stabilizing device , wherein a resonator length is changed and an oscillation frequency of laser light is stabilized to a specific saturated absorption line based on a saturated absorption line in a light output signal obtained by shining laser light on an absorption cell , the method comprising:defining a first threshold value and a second threshold value based on an output value of the light output signal, the first threshold value and the second threshold value being in a magnitude relationship;comparing an output value of a second-order differential signal of the light output signal with the first threshold value and the second threshold value, then determining whether the second-order differential signal following a change in the resonator length has an output waveform displaying a behavior in which the output waveform changes from less than the second threshold value to be equal to or greater than the first threshold value, and then changes to be less than the second ...

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Номер записи: 51
15-08-2013 дата публикации

Method and Apparatus for Providing Supercontinuum Pulses

Номер: US20130208738A1
Автор: Clowes John Redvers, Godfrey Ian Michael, Grudinin Anatoly Borisovich
Принадлежит:

Optical pulse source for generating optical supercontinuum pulses, comprising an optical pump laser operable to generate optical pump pulses at a pump pulse repetition rate Rf; a nonlinear optical element comprising a microstructured optical fiber arranged to receive the optical pump pulses and configured to spectrally broaden the pump pulses to generate optical supercontinuum pulses; an optical modulator provided between the optical pump laser and the microstructured optical fiber and operable to selectively control the launch of pump pulses into the microstructured optical fiber at a variable, reduced repetition rate Rr=Rf/N, wherein N is a positive integer, to thereby control the repetition rate of optical supercontinuum pulses generated within the nonlinear element; and wherein the optical pulse source is configured to provide a plurality of different repetition rates and nominally identical spectral broadening for the different repetition rates. 1. Optical pulse source for generating optical supercontinuum pulses , comprising:an optical pump laser operable to generate optical pump pulses at a pump pulse repetition rate Rf;a nonlinear optical element comprising a microstructured optical fiber arranged to receive the optical pump pulses and configured to spectrally broaden the pump pulses to generate optical supercontinuum pulses;an optical modulator provided between the optical pump laser and the microstructured optical fiber and operable to selectively control the launch of pump pulses into the microstructured optical fiber at a variable, reduced repetition rate Rr=Rf/N, wherein N is a positive integer, to thereby control the repetition rate of optical supercontinuum pulses generated within the nonlinear element; andwherein said optical pulse source is configured to provide a plurality of different repetition rates Rr and nominally identical spectral broadening for the different repetition rates.2. The optical pulse source of comprising a first optical fiber ...

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Номер записи: 52
15-08-2013 дата публикации

Laser architectures

Номер: US20130208741A1
Автор: Bing Xu, Chuni Ghosh, Jean-francois SEURIN, Robert Vanleeuwen, Yihan Xiong
Принадлежит: RealD Inc

Disclosed herein are architectures for VCSEL systems. By using high power IR VCSEL element(s), a bulk doubling material can be used to double the IR light and generate visible light (red, green, blue, or UV light) in a cavity, in either continuous wave (CW) or pulsed mode. The reflectivity of the output distributed Bragg reflector (DBR) of these VCSELs can be designed to increase the power in the cavity, rather than the power in the VCSEL laser. By enabling the use of a bulk doubling material in the cavity and directly doubling the VCSEL the device can be inexpensive, simpler, high efficiency, better reliability, and vastly improved manufacturing and alignment tolerances. There are a number of cavity architectures that can be used to double the IR light from the VCSEL(s). The VCSEL(s) can be single elements, or arrays with high intensity elements.

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Номер записи: 53
22-08-2013 дата публикации

BURST OSCILLATION METHOD IN LASER SYSTEM AND APPARATUS FOR SAME

Номер: US20130215494A1
Автор: Lee Yeung Lak, Noh Young-Chul, Shin Woojin, Yu Bong-Ahn
Принадлежит: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY

Disclosed is a burst mode oscillation method for burst mode oscillation by controlling the peak output of light pulses in a laser system. The burst mode oscillation apparatus includes a seed beam generator which receives electrical input signals having different pulse widths, modulates pulse widths and amplitudes of outputs in output light according to the received electrical input signals, and outputs the modulated pulse light, an amplifier which amplifies the modulated pulse light and outputs amplified pulse light, and a non-linear wavelength converter which can control wavelength-converted output light according to the amplitudes of the peak output changed through the pulse widths of the amplified pulse light. 1. A burst mode oscillation apparatus for a laser system , comprising:a seed beam generator which receives electrical input signals having different pulse widths, modulates pulse widths and amplitudes of output light based on the pulse widths of the received electrical input signals, and outputs modulated pulse light;an amplifier which amplifies the modulated pulse light and outputs amplified pulse light; anda non-linear wavelength converter which converts wavelengths of the amplified pulse light and outputs wavelength-converted light.2. The burst mode oscillation apparatus according to claim 1 , wherein the seed beam generator determines a peak output inversely proportional to a magnitude of the shortest pulse width at the same repetition rate among the different pulse widths.3. The burst mode oscillation apparatus according to claim 1 , wherein the wavelength-converted output light is generated proportional to the square of an intensity of a laser beam input into a non-linear optical system.4. The burst mode oscillation apparatus according to claim 1 , wherein claim 1 , when the peak output is lower than a predetermined critical value claim 1 , the wavelength-converted output light is output with lower amplitudes than those of input light.5. A burst mode ...

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Номер записи: 54
22-08-2013 дата публикации

Laser apparatus and laser materials processing apparatus provided with same

Номер: US20130215914A1
Автор: Hirofumi Imai, Koji Hirano
Принадлежит: Nippon Steel and Sumitomo Metal Corp

A laser apparatus of the present invention has a first laser oscillator that emits a first laser beam; a passive fiber that is a double-clad fiber that transmits the first laser beam through a core; and a second laser oscillator that emits a second laser beam that is coupled into inner cladding of the passive fiber. Additionally, a laser materials processing apparatus of the present invention is provided with the laser apparatus; and an irradiation optical system having a collimating lens and a condenser lens.

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Номер записи: 55
22-08-2013 дата публикации

Laser apparatus

Номер: US20130215916A1
Автор: Kouji Kakizaki, Osamu Wakabayashi, Shinichi Matsumoto, Shinji Okazaki, Takashi Onose
Принадлежит: GIGAPHOTON INC

A laser apparatus includes a master oscillator capable of outputting a laser beam having a spectrum that includes at least three wavelength peaks, a multi-wavelength oscillation control mechanism capable of controlling energy of each of the wavelength peaks, a spectrum detecting unit that detects the spectrum of the above-mentioned laser beam, and a controller that controls the multi-wavelength oscillation control mechanism based on a detection result detected by the spectrum detecting unit.

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Номер записи: 56
29-08-2013 дата публикации

METHOD AND DEVICE FOR FAST TUNING OF OPTICAL SOURCES

Номер: US20130223459A1
Автор: Radic Stojan
Принадлежит: The Regents of the University of California

A method and device are provided for fast, continuous tuning of an optical source. A first pump signal with a first pump frequency is input into a mixer along with a first seed signal having a first seed frequency. Within the mixer, the first pump signal and the first seed signal generate at least one idler having an idler frequency defined as two times the pump frequency minus the seed frequency. Shifting the pump signal across a frequency range at a sweep rate causes the idler frequency to be shifted by two times the frequency range at two times the sweep rate. The shifted at least one idler is mixed with the shifted pump signal to generate a first mix product that has two times the sweep rate and frequency range of the pump signal. 1. A method for tuning an optical source , comprising:inputting a first pump signal having a first pump frequency into a mixer;inputting a first seed signal having a first seed frequency into the mixer;generating at least one idler having an idler frequency defined as two times the pump frequency minus the seed frequency;shifting the pump signal across a frequency range at a sweep rate whereby the idler frequency is shifted by two times the frequency range at two times the sweep rate; andmixing the shifted at least one idler with the shifted pump signal to generate at a mixer output a first mix product having two times the sweep rate and frequency range of the pump signal.2. The method of claim 1 , further comprising inputting the first mix product into a second mixer stage having a second seed signal claim 1 , whereby a second mix product of the second mixer stage has a sweep rate and a frequency range that are doubled relative to the first mix product.3. The method of claim 2 , further comprising inputting the second mix product into n additional stages claim 2 , whereby an nmix product is generated having a sweep rate and a frequency range that are scaled up to (n+1) times the pump signal.4. The method of claim 1 , wherein the pump ...

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Номер записи: 57
05-09-2013 дата публикации

END-PUMPED ALIGNMENT AND TEMPERATURE INSENSITIVE LASER TARGET DESIGNATOR AND MARKER

Номер: US20130230062A1
Автор: McCarthy John C., Miller Christopher A., Snell Katherine J.
Принадлежит: BAE Systems Information and Electronic Systems Integration Inc.

A compact, lightweight, laser target designator uses a TIR bounce geometry to place an end-pumped gain element functionally in the center of the resonator path, thereby allowing the resonator path to be terminated by a pair of crossed Porro prisms, so that the designator produces a high quality beam that is insensitive to alignment and temperature, and is low in manufacturing cost. Some embodiments fold the Porro legs of the resonator path back toward the gain element for compactness. Embodiments use a single gain element as both an oscillator gain element with TIR and as an output amplifier gain element without TIR. Various embodiments use block optical elements in a planar layout on a standard support medium such as aluminum to facilitate automated manufacturing. 1. A laser target designator , comprising:a gain element having a primary axis terminated by a front end and a back end;a pumping source cooperative with the gain element and configured to transmit optical pumping energy into the gain element through its back end;a first Porro prism positioned to intercept light emerging at a first angle from the front end of the gain element and oriented to reflect the light back into the front end of the gain element;a second Porro prism positioned to intercept light emerging at a second angle from the front end of the gain element and oriented to reflect the light back into the front end of the gain element, the second Porro prism having a crossed orientation relative to the first Porro prism,the gain element and the first and second Porro prisms forming an optical resonator path in which light reflected by the first Porro prism travels through a first Porro leg, enters the front end of the gain element at the first angle, undergoes total internal reflection within the gain element and is amplified thereby, emerges from the front end of the gain element at the second angle, travels through a second Porro leg, and strikes the second Porro prism, the light being thereby ...

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Номер записи: 58
05-09-2013 дата публикации

METHODS OF MODULATING MICROLASERS AT ULTRALOW POWER LEVELS, AND SYSTEMS THEREOF

Номер: US20130230063A1
Автор: CHANG Chieh-feng, KIM Seheon, RAJAGOPAL Aditya, Scherer Axel
Принадлежит: California Institute of Technology

A microlaser system includes an optical source, a microlaser, an actuator switch, and a photovoltaic power source. The microlaser, which includes a control element, is optically pumped by at least a portion of light emitted by the optical source. The actuator switch is configured to be activated by a triggering event. Furthermore, the photovoltaic power source is coupled in a series connection with the actuator switch and the control element, the series connection configured to connect the photovoltaic power source to the control element of the microlaser when the actuator switch is activated by the triggering event. 1. A microlaser system comprising:an optical source;a microlaser that is optically pumped by at least a portion of light emitted by the optical source, the microlaser comprising a control element;an actuator switch configured to be activated by a triggering event; anda photovoltaic power source coupled in a series connection with the actuator switch and the control element, the series connection configured to connect the photovoltaic power source to the control element of the microlaser when the actuator switch is activated by the triggering event.2. The system of claim 1 , wherein the at least a portion of light comprises a train of pulses that wirelessly power the microlaser.3. The system of claim 2 , wherein at least one of a pulse width or a duty cycle of the train of pulses is selected on the basis of a thermal threshold of operation of the microlaser.4. The system of claim 1 , wherein the microlaser is configured to receive a first portion of light emitted by the optical source and the photovoltaic power source is configured to receive a second portion of light emitted by the optical source.5. The system of claim 4 , wherein the photovoltaic power source is operative to converting the second portion of light into electrical power claim 4 , and wherein the microlaser is operative to use the first portion of light to enter a lasing state without ...

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Номер записи: 59
05-09-2013 дата публикации

Master oscillator system and laser apparatus

Номер: US20130230064A1
Автор: Hiroshi Tanaka, Osamu Wakabayashi, SATOSHI Tanaka
Принадлежит: GIGAPHOTON INC

A master oscillator system may include a grating configured to function as one resonator mirror in an optical resonator, a spectral bandwidth tuning unit configured to tune the spectral bandwidth of a laser beam transmitted within the optical resonator, a storage unit configured to store a control value of the spectral bandwidth tuning unit corresponding to a desired spectral bandwidth and a controller configured to control the spectral bandwidth tuning unit based on the control value stored in the storage unit.

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Номер записи: 60
05-09-2013 дата публикации

LIGHT SOURCE DEVICE, ANALYSIS DEVICE, AND LIGHT GENERATION METHOD

Номер: US20130230066A1
Автор: OTO Masanori
Принадлежит: FUJI ELECTRIC CO., LTD.

In aspects of the invention, wavelength conversion element has a harmonic generation portion and a parametric oscillation portion. The harmonic generation portion generates a harmonic of laser light output from a laser light source. The parametric oscillation portion generates signal light and idler light from the harmonic generated by the harmonic generation portion. In some aspects of the invention, electrodes and a first voltage control portion control the intensity of the harmonic generated by the harmonic generation portion. A first FBG (Fiber Bragg Grating) and a second FBG cause resonance of signal light output from the parametric oscillation portion. A piezo tube and a second voltage control portion change the resonance frequency of the first FBG and the second FBG. 1. A light source device , comprising:a laser light source;a wavelength conversion element, having a harmonic generation portion which generates a harmonic of laser light output from the laser light source, and a parametric oscillation portion which generates signal light and idler light from the harmonic generated by the harmonic generation portion;an intensity control portion, which is provided separately from the laser light source, and controls an intensity of the harmonic generated by the harmonic generation portion;a resonator, which causes resonance of the signal light output from the parametric oscillation portion; anda resonance control portion, which changes a resonance frequency of the resonator,wherein the resonator includes a FBG (Fiber Bragg Grating) which connects an input side and an output side of the wavelength conversion element, andthe resonance control portion changes the resonance frequency of the resonator by applying stress to the FBG in a direction of extension of this FBG.2. The light source device according to claim 1 , wherein the intensity control portion controls the intensity of the harmonic by disturbing a phase matching condition of the laser light in the harmonic ...

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Номер записи: 61
12-09-2013 дата публикации

Optical Amplifier and Optical Transmission System

Номер: US20130235449A1
Автор: SUZUKI Mikiya
Принадлежит: FURUKAWA ELECTRIC CO., LTD.

An optical amplifying apparatus that amplifies an optical signal, including an input section whereto the optical signal is inputted, a laser light source that generates laser light, the laser light source including an uncooled semiconductor laser device, an optical fiber that amplifies the optical signal by a stimulated emission based on the laser light from the laser light source, an output section that outputs the optical signal amplified by the optical fiber, and a passive optical component disposed between the optical fiber and the output section. The laser light source is thermally coupled to the optical fiber and/or the passive optical component via a thermally conductive medium. An oscillating wavelength of the laser light source is varied by increasing a temperature of the laser light source with heat generated by the optical fiber and/or the passive optical component. 1. An optical amplifying apparatus that amplifies an optical signal , comprising:an input section whereto the optical signal is inputted;a laser light source that generates laser light, the laser light source including an uncooled semiconductor laser device;an optical fiber that amplifies the optical signal by a stimulated emission based on the laser light from the laser light source;an output section that outputs the optical signal amplified by the optical fiber; anda passive optical component disposed between the optical fiber and the output section,the laser light source being thermally coupled to the optical fiber and/or the passive optical component via a thermally conductive medium,an oscillating wavelength of the laser light source being varied by increasing a temperature of the laser light source with heat generated by the optical fiber and/or the passive optical component.2. The optical amplifying apparatus according to claim 1 , wherein the heat generated by the optical fiber and/or the passive optical component is transferred to the laser light source claim 1 , and a wavelength band ...

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Номер записи: 62
12-09-2013 дата публикации

WAVELENGTH MONITOR, WAVELENGTH LOCKABLE LASER DIODE AND METHOD FOR LOCKING EMISSION WAVELENGTH OF LASER DIODE

Номер: US20130235891A1
Автор: Edwards Phillip, FUKUDA Chie, Kaneko Toshimitsu, Thompson Lance
Принадлежит: Sumitomo Electric Industries, Ltd.

A wavelength monitor monolithically integrated with a tunable LD is disclosed. The wavelength monitor includes at least two filters, each having a periodic transmission sptectrum but a period between nearest neighbor periods is different from the other. A transmittance of the first filter and another transmittance of the second filter at a grid wavelength attributed to the WDM system forms a combination which is specific to the grid wavelength bur different from other combinations at other grid wavelengths. 17.-. (canceled)8. A wavelength lockable LD , comprising:a tunable LD to emit light with an emission wavelength substantially coincident with a target grid wavelength of a WDM system, the tunable LD including a SG-DFB region and a CSG-DBR region, the CSG-DBR region providing a plurality of heaters monolithically integrated therein;a wavelength monitor including a first optical filter and a second optical filter, the first optical filter having a first transmittance spectrum periodically varying in a wavelength range of the WDM system, the second optical filter having a second transmittance spectrum periodically varying in the wavelength range, the first transmittance spectrum and the second transmittance spectrum at the target grid wavelength having a combination in respective transmittances specific to the target grid wavelength different from combinations in transmittances at other grid wavelengths; anda controller to tune the emission wavelength of the tunable LD such that the first optical filter and the second optical filter show a combination in respective transmittances equal to the combination at the grid wavelength by applying a bias to the SG-DFB region and heater powers to the heaters in the CSG-DBR region.9. The wavelength lockable LD of claim 8 ,wherein the first optical filter and the second optical filter has an arrangement selected from a group of a ring filter and a Mach-Zender filter.10: The wavelength lockable LD of claim 8 ,wherein the first ...

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Номер записи: 63
12-09-2013 дата публикации

LASER LIGHT SOURCE, LASER PROCESSING DEVICE, AND SEMICONDUCTOR PROCESSING METHOD

Номер: US20130235895A1
Автор: Mizuuchi Kiminori, Takagi Susumu
Принадлежит: Panasonic Corporation

A laser light source () according to the present invention includes a laser resonator () including a fiber () containing a laser active medium and a fiber grating () coupled to each of two ends of the fiber (); an pumping laser light source () for emitting pump light into the laser resonator (); a driving current supply circuit () for supplying a pulse-like driving current to the pumping laser light source (); and a wavelength conversion element () for converting a wavelength of laser light which is output from the laser resonator. The laser resonator () generates laser light including a principal pulse and a plurality of superimposing pulses which are superimposed on the principal pulse, in accordance with incidence of the pump light; and converted light having the wavelength of each of the principal pulse and the superimposing pulses shortened is generated by the wavelength conversion element (). 1. A laser light source , comprising:a laser resonator including a fiber containing a laser active medium and fiber gratings coupled to each of two ends of the fiber;a pumping laser light source for emitting pump light into the laser resonator;a driving current supply circuit for supplying a pulse-like driving current to the pumping laser light source; anda wavelength conversion element for converting a wavelength of laser light which is output from the laser resonator;wherein:the laser resonator generates laser light including a principal pulse and a plurality of superimposing pulses which are superimposed on the principal pulse, in accordance with incidence of the pump light; andconverted light having the wavelength of each of the principal pulse and the superimposing pulses shortened is generated by the wavelength conversion element.2. The laser light source of claim 1 , wherein the laser resonator performs laser oscillation in a plurality of longitudinal modes and allows the plurality of longitudinal modes to interfere with each other to form the plurality of ...

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Номер записи: 64
26-09-2013 дата публикации

LASER BASED FREQUENCY STANDARDS AND THEIR APPLICATIONS

Номер: US20130250978A1
Автор: FERMANN Martin, HARTL Ingmar
Принадлежит: IMRA AMERICA, INC.

Frequency standards based on mode-locked fiber lasers, fiber amplifiers and fiber-based ultra-broad bandwidth light sources, and applications of the same. 1. A fiber-based laser system , comprising:a passively mode locked fiber laser having a pulse repetition frequency, PRF, greater than about 110 MHz, wherein an output of said passively mode locked fiber laser comprises a carrier envelope offset frequency, fceo, said passively mode locked fiber laser comprising an optical cavity having intra-cavity components configured to modify and stabilize said carrier envelope offset frequency, based on one or more signals representative of a variation of said carrier envelope offset frequency.2. The laser system according to claim 1 , said optical cavity having a net cavity dispersion claim 1 , wherein said cavity is configured in such a way that the net cavity dispersion is substantially lower than the dispersion of any intra-cavity component.3. The laser system according to claim 1 , further comprising a fiber amplifier receiving outputs from said passively modelocked fiber laser and generating amplified pulses.4. The laser system according to claim 3 , further comprising a supercontinuum generator coupled to one of said fiber laser and said fiber amplifier.5. The laser system according to claim 1 , wherein said laser system comprises a highly non-linear waveguide disposed downstream from said passively modelocked fiber laser.6. The laser system of claim 5 , wherein said highly non-linear waveguide comprises a positively dispersive Bismuth oxide based highly nonlinear fiber for spectral broadening.7. The laser system of claim 5 , wherein said highly non-linear waveguide is based on a crystalline material.8. The laser system according to claim 5 , wherein said highly non-linear waveguide comprises LiNbO claim 5 , silicon claim 5 , or a semiconductor material.9. The laser system according to claim 5 , wherein said laser system comprises a supercontinuum generator which ...

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Номер записи: 65
03-10-2013 дата публикации

WIDE-BAND RF PHOTONIC RECEIVERS AND OTHER DEVICES USING TWO OPTICAL MODES OF DIFFERENT QUALITY FACTORS

Номер: US20130258435A1
Автор: Ilchenko Vladimir, Maleki Lute, Matsko Andrey B., Savchenkov Anatoliy, Seidel David
Принадлежит: OEwaves, Inc.

This document provides techniques, apparatus and designs for using electro-optic WGM resonators that support two different families of optical WGM modes with different quality factors in various applications. A radio frequency (RF) resonator is formed on the optical resonator and structured to supply an RF field and spatially overlaps the RF field of the RF resonator with the first and second optical whispering gallery modes to cause RF energy in the RF field at a first RF carrier frequency to couple with the first optical whispering gallery mode and RF energy in the RF field at a second RF carrier frequency to couple with the second optical whispering gallery mode. 1. A device , comprising:a laser that produces laser light;an optical resonator that receives the laser light from the laser, the optical resonator including an electro-optic material having a refractive index responsive to an electric field and structured to support at least one first optical whispering gallery mode having a first quality factor, and at least one second optical whispering gallery mode with a second quality factor less than the first quality factor;a radio frequency (RF) resonator formed on the optical resonator and structured to spatially overlap an RF field of the RF resonator with the fields of the first and second optical whispering gallery modes;wherein the electro-optic material of the optical resonator is structured to include two electro-optic material pieces having respective crystalline axes to be opposite to each other and to interact with the RF resonator to cause coupling between the first and second optical whispering gallery modes via the RF field;a first optical coupler located in an optical path of the laser light and optically coupled to the optical resonator to couple the laser light from the laser into the optical resonator in the first optical whispering gallery mode and couple light in the first optical whispering gallery mode inside the optical resonator out of the ...

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Номер записи: 66
03-10-2013 дата публикации

BROADBAND OPTICAL ACCUMULATOR AND TUNABLE LASER USING A SUPERCONTINUUM CAVITY

Номер: US20130259071A1
Автор: Blais-Ouellette Sébastien
Принадлежит: PHOTON ETC INC.

A broadband optical accumulator and tunable narrowband optical source use a microstructured optical fiber into which optical energy is coupled at a first wavelength. The input optical energy is spectrally broadened as it propagates through the fiber, and the output signal is directed to a wavelength separator such as a Bragg grating. A narrowband portion of the output signal is redirected by the grating, while the remainder is reinjected into the fiber. Adjustment of the output wavelength band may be accomplished by changing the incidence angle of the output signal by pivoting the grating. The grating may be located in a housing and surrounded by index matching fluid, and the narrowband portion of the output signal isolated by the grating may be redirected to an output location by a reflector that moves with pivoting of the grating. 1. A broadband optical accumulator comprising:an optical fiber apparatus having a microstructured optical fiber configured such that an optical signal present in the fiber propagates repeatedly therewithin;a narrowband optical source that generates optical energy in a first narrow wavelength band; andan injection apparatus that couples the first narrow wavelength band optical energy into a first end of the fiber, said narrowband optical energy undergoing spectral broadening as it propagates within the fiber cavity.2. A broadband optical accumulator according to wherein optical energy coupled into the first end of the fiber exits a second end of the fiber claim 1 , and wherein the optical fiber apparatus is configured such that optical energy exiting the second end of the fiber is coupled back into the first end of the fiber.3. A broadband optical generator according to wherein the injection apparatus comprises a wavelength dependent element located in an optical path of the optical energy exiting the second end of the fiber claim 1 , the wavelength dependent element redirecting the optical energy from the optical source toward the first ...

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Номер записи: 67
31-10-2013 дата публикации

Method and Apparatus for the Line Narrowing of Diode Lasers

Номер: US20130284710A1
Автор: Donald Ronning, Paul Hoff
Принадлежит: Translith Systems LLC

A system for narrowing the spectral output of diode lasers through the use of dielectric stacks in the laser cavity comprising an alternating sequence of layers of dielectric material and air, which dielectric stacks are fabricated through the controlled laser ablation of the dielectric material.

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Номер записи: 68
31-10-2013 дата публикации

APPARATUS AND METHOD FOR STABILIZING PULSE OF FIBER-TYPE FEMTOSECOND LASER

Номер: US20130287051A1
Автор: CHOI Jin Doo, JO Seung Hwan, KIM Jin Hwan, KIM Kyung-Soo, Kim Soo Hyun, Kwon Won Sik, Lee Hyub, Lee Sang Wook, OH Seung Ryeol, Ryu Sung Yoon
Принадлежит: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Provided are an apparatus and method for stabilizing a pulse of a fiber-type femtosecond laser, and more particularly, to an apparatus for stabilizing a pulse of a fiber-type femtosecond laser, which adjusts a distance between a saturable absorption material and an optical fiber connection unit of the femtosecond laser to automatically perform mode-locking, thereby obtaining a laser pulse stabilized for a long time, and a method for stabilizing the pulse of the fiber-type femtosecond laser. The apparatus for stabilizing a pulse of a fiber-type femtosecond laser in a fiber-type femtosecond laser system including a pump laser () and a fiber cavity () includes a distance adjustment part () adjusting a distance (d) between a saturable absorption material () and a connection unit of an optical fiber () which are provided within the fiber cavity (). 1100200300700310200. An apparatus for stabilizing a pulse of a fiber-type femtosecond laser in a fiber-type femtosecond laser system comprising a pump laser () and a fiber cavity () , the apparatus comprises a distance adjustment part () adjusting a distance (d) between a saturable absorption material () and a connection unit of an optical fiber () which are provided within the fiber cavity ().2300. The apparatus of claim 1 , wherein the distance adjustment part () comprises:{'b': '360', 'a base ();'}{'b': '310', 'a first optical fiber ();'}{'b': 320', '700, 'a second optical fiber () that mounts the saturable absorption material ();'}{'b': 360', '310', '360', '310', '700', '320, 'a moving unit () supporting the first optical fiber () and relatively movable with respect to the base () to adjust a distance (d) between the first optical fiber () and the saturable absorption material () mounted on the second optical fiber (); and'}{'b': 340', '330, 'a driving unit () relatively moving the moving unit ().'}3300. The apparatus of claim 1 , wherein the distance adjustment part () comprises:{'b': '400', 'a coupler () branching a ...

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Номер записи: 69
07-11-2013 дата публикации

LIGHT SOURCE DEVICE, ANALYSIS DEVICE, AND LIGHT GENERATION METHOD

Номер: US20130293895A1
Автор: OTO Masanori
Принадлежит:

In some aspects of the invention, wavelength conversion elements are provided for each of a plurality of laser light sources, and have different wavelength conversion characteristics. In some aspects, each of the wavelength conversion elements converts the wavelength of laser light incident on each of the wavelength conversion elements. The wavelengths of the laser light after wavelength conversion are different from one another. A multiplexer couples the plurality of laser light rays output from the plurality of wavelength conversion elements and outputs the laser light as coaxial light. A VBG (Volume Bragg Grating) is provided between the plurality of laser light sources and the plurality of wavelength conversion elements, and forms at least a portion of a laser light resonator. 1. A light source device , comprising:a plurality of laser light sources;a plurality of wavelength conversion elements provided for each of the plurality of laser light sources and having different wavelength conversion characteristics, and moreover converting laser light into different wavelengths;a multiplexer coupling the plurality of laser light rays output from the plurality of wavelength conversion elements and outputting the rays as coaxial light; anda first Bragg reflection portion provide between the plurality of laser light sources and the plurality of wavelength conversion elements and forming at least one portion of a resonator for the laser light, whereina VBG (Volume Bragg Grating) element, which is the first Bragg reflection portion, is provided between at least one of the plurality of laser light sources and the wavelength conversion element corresponding to the laser light source,the laser light source for which the VBG element is provided faces the VBG element at a position where a desired frequency exhibits a reflection frequency of the VBG element.2. The light source device according to claim 1 , wherein at least one of the plurality of laser light sources is a ...

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Номер записи: 70
07-11-2013 дата публикации

YB: AND ND: MODE-LOCKED OSCILLTORS AND FIBER SYSTEMS INCORPORATED IN SOLID-STATE SHORT PULSE LASER SYSTEMS

Номер: US20130293941A1
Автор: BENDETT Mark, CHO Gyu C., FERMANN Martin E., Gu Xinhua, HARTER Donald J., HARTL Ingmar, LIU Zhenlin, NATI Salvatore F., SHAH Lawrence
Принадлежит:

The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier. 1. A pulse source , comprising:a seed source emitting seed pulses;at least one fiber amplifier receiving said seed pulses;a monitor for one or more parameters of said pulse source, said monitor being operatively coupled to at least said seed source and responsive to one or more parameters of said seed source;one or more pump laser diodes for pumping said seed source and said at least one fiber amplifier; anda bulk optical amplifier receiving amplified pulses from said at least one amplifier and producing output pulses.2. The pulse source according to claim 1 , wherein said at least one fiber amplifier comprises a non-linear amplifier that generates self-phase modulation claim 1 , said self-phase modulation spectrally compressing pulses propagating in said non-linear amplifier to a spectral width smaller than an injected spectral width of said seed pulses claim 1 , whereby a spectral width of pulses emerging from said fiber amplifier chain is spectrally narrowed as compared to said injected spectral width claim 1 , and said spectrally narrowed pulses are matched to a gain bandwidth of said bulk optical amplifier.3. The pulse source according to claim 2 , wherein said monitor is operatively coupled to at least one of said seed source claim 2 , said bulk optical amplifier claim 2 , or said one or more pump diodes.4. The pulse source according to claim 2 , wherein a gain medium of said bulk optical amplifier comprises Yb:YAG claim 2 , Nd:YAG claim 2 , Nd:YLF claim 2 , Nd:YVO.sub.4 claim 2 , Nd:glass claim 2 , Yb claim 2 , glass claim 2 , Nd:KGW claim 2 , or a narrow bandwidth Nd-based crystal.5. The pulse source according to claim 2 , wherein said ...

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Номер записи: 71
07-11-2013 дата публикации

OPTICAL FREQUENCY RULER

Номер: US20130293946A1
Автор: FERMANN Martin E., HARTL Ingmar
Принадлежит: IMRA AMERICA, INC.

The present invention relates to frequency rulers. At least one embodiment includes a mode locked pump source operated at pulse repetition rate, and a pump output having a pump carrier envelope offset frequency. A nonlinear optical system outputs a frequency ruler spectrum comprising individual frequency modes. The frequency modes may be characterized by a frequency spacing which is an integer multiple of the repetition rate and by distinct ruler carrier envelope offset frequencies which exhibit at least one discontinuity across the frequency output. The ruler carrier envelope offset frequencies are substantially locked to the carrier envelope offset frequency of the pump laser. One preferred embodiment includes a frequency doubled, doubly resonant, non-degenerate OPO (DNOPO), a supercontinuum generation (SC) stage and at least one reference laser arranged downstream from a Tm fiber-based pump source. A plurality of beat signals generated therefrom provide for stabilization of the system. 1. A frequency ruler , comprising ,{'sub': rep', '0p, 'a pump source comprising a mode locked laser, said pump source generating pump pulses at a pulse repetition rate fand characterized by having a pump carrier envelope offset frequency f; and'}a nonlinear optical system receiving said pump pulses and producing as an output a frequency ruler spectrum comprising individual frequency modes, said frequency modes characterized by having: a frequency spacing which is an integer multiple of said repetition rate, and distinct ruler carrier envelope offset frequencies which exhibit at least one discontinuity as a function of frequency;{'sub': 0p', 'rep, 'said carrier envelope offset frequencies of said nonlinear system being passively stable and, for a given value of f, exhibiting absolute frequency fluctuations of less than 10% of f'}2. The frequency ruler according to claim 1 , wherein said nonlinear optical system comprises a doubly-resonant non-degenerate optical parametric oscillator ...

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Номер записи: 72
07-11-2013 дата публикации

HIGHLY EFFICIENT 3rd HARMONIC GENERATION IN Nd: YAG LASER

Номер: US20130294465A1
Автор: Chao CHANG, Laurence E. Cramer
Принадлежит: CONTINUUM

The specification and drawings present an apparatus and a method for intra-cavity harmonic generation in lasers such as solid-state lasers using a multi-resonance cavity with meniscus lenses for focusing corresponding wavelength radiation components on non-linear optical elements such as non-linear optical crystals using type I or type II phase-matching for significantly increasing efficiency of the harmonic conversion and output powers of generated harmonics. Using only type I or only type II phase-matching for all non-linear crystals may eliminate the requirement of linear-polarization on the fundamental laser wavelength generation. For example, a highly efficient UV Nd:YAG laser at 355 nm (a third harmonic of the fundamental wavelength of 1064 nm for the Nd:YAG laser) using intra-cavity triple resonance cavity and meniscus lenses has been developed using embodiments described herein.

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Номер записи: 73
07-11-2013 дата публикации

LASER DEVICE AND METHOD

Номер: US20130294466A1
Автор: BISHOP DONALD, KIMBERLIN DWIGHT
Принадлежит:

A laser beam combining and power scaling device and method. A first highly reflective mirror residing perpendicular to the first optical axis reflecting radiation emitted from the first laser head. A first Q-switch in alignment with the first optical axis interposed between the first highly reflective mirror and the first laser head. A second highly reflective mirror residing perpendicular to the second optical axis reflecting radiation emitted from the second laser head. The second Q-switch in alignment with the second optical axis is interposed between the second highly reflective mirror and the first laser head. A third optical axis is coincident with the first optical axis. A third highly reflective mirror residing perpendicular to the third optical axis in alignment therewith. The third optical axis may include a third diode pumped laser head and Q-switch. A beam splitter resides at the intersection of the axes. 132-. (canceled)33. A laser beam combining and power scaling method using first , second and third laser heads having first , second and third optical axes , a first highly reflective mirror residing perpendicular to said first optical axis in alignment therewith behind said first laser head reflecting radiation when emitted from said first laser head , a first Q-switch in alignment with said first optical axis interposed between said first highly reflective mirror and said first laser head , a second highly reflective mirror residing perpendicular to said second optical axis in alignment therewith behind said second laser head reflecting radiation when emitted from said second laser head; a second Q-switch in alignment with said second optical axis interposed between said first highly reflective mirror and said second laser head , a third highly reflective mirror residing perpendicular to said third optical axis in alignment therewith behind said third laser head , a third Q-switch in alignment with said third optical axis interposed between said third ...

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Номер записи: 74
14-11-2013 дата публикации

Method and Apparatus for Quantum Mechanical Entanglement Protection

Номер: US20130301094A1
Автор: GILBERT Gerald N., Hodges Jonathan S., Pappas Stephen Peter, Weinstein Yaakov Shmuel
Принадлежит: The Mitre Corporation

Embodiments of the present invention provide systems and methods to robustly inter-convert between polarization-entangled photon pairs and time-entangled photon pairs, such that produced polarization-entangled photons pairs can be converted into time-entangled photon pairs, stored as time-entangled photon pairs to preserve the entanglement for longer periods of time, and then converted back to polarization-entangled photon pairs when ready for manipulation, processing, and measurement by a quantum application. 1. A system , comprising:a first module configured to receive a polarization-entangled photon pair, the polarization-entangled photon pair comprising time-coincident first and second photons having first and second polarizations respectively, and to produce time-separated first and second photons having the first and second polarizations respectively; anda second module configured to receive the time-separated first and second photons and to adjust at least one of the first polarization of the first photon and the second polarization of the second photon to produce a time-entangled photon pair, the time-entangled photon pair comprising time-shifted first and second photons each having a third polarization.2. The system of claim 1 , wherein the first module comprises:a first polarizing beam splitter (PBS) configured to receive and split the time-coincident first and second photons;a first path, coupled to the first PBS, configured to receive the first photon of the time-coincident first and second photons;a second path, coupled to the first PBS, configured to receive the second photon of the time-coincident first and second photons; anda second PBS, coupled to the first and second paths, configured to combine the first and second photons to produce the time-separated first and second photons.3. The system of claim 2 , wherein the first and second paths have first and second lengths respectively claim 2 , and wherein the first length is shorter than the second ...

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Номер записи: 75
14-11-2013 дата публикации

HIGHLY RARE-EARTH-DOPED OPTICAL FIBERS FOR FIBER LASERS AND AMPLIFIERS

Номер: US20130301115A1
Автор: Dong Liang, FERMANN Martin E., Fu Libin, McKay Hugh, Suzuki Shigeru
Принадлежит:

Various embodiments described herein comprise a laser and/or an amplifier system including a doped gain fiber having ytterbium ions in a phosphosilicate glass. Various embodiments described herein increase pump absorption to at least about 1000 dB/m-9000 dB/m. The use of these gain fibers provide for increased peak-powers and/or pulse energies. The various embodiments of the doped gain fiber having ytterbium ions in a phosphosilicate glass exhibit reduced photo-darkening levels compared to photo-darkening levels obtainable with equivalent doping levels of an ytterbium doped silica fiber. 1. An optical fiber comprising:a rare earth doped glass comprising silica, ytterbium, phosphorus, and aluminum,wherein the concentration of ytterbium in said rare-earth doped glass is in the range from 0.5 to 15 mol % so that said optical fiber is configured to have a peak absorption greater than about 3000 dB/m at a pump wavelength and a gain greater than about 0.5 dB/cm at an emission wavelength,{'sub': 2', '5, 'wherein the concentration of phosphorous in said rare-earth doped glass comprises at least 50 mol % POso that a saturated value of photo-darkening loss in the optical fiber is less than about 10 dB/m at said emission wavelength,'}wherein the concentration of aluminum in said rare-earth doped glass is in a range from 0.5 to 15 mol %, andwherein the concentration of boron in said rare-earth doped glass is in a range from 0 to 25 mol %.2. The optical fiber of claim 1 , wherein said optical fiber is a large-core optical fiber having a core diameter larger than about 30 μm.3. The optical fiber of claim 2 , wherein said core diameter is less than about 130 μm.4. The optical fiber of claim 1 , wherein said rare-earth doped glass further comprises 0.5 to 1 mol % erbium.5. The optical fiber of claim 1 , wherein the concentration of aluminum in said rare-earth doped glass is in a range from 1 to 10 mol %.6. The optical fiber of claim 1 , wherein the concentration of aluminum in said ...

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Номер записи: 76
14-11-2013 дата публикации

METHODS, SYSTEMS, AND APPARATUS FOR HIGH ENERGY OPTICAL-PULSE AMPLIFICATION AT HIGH AVERAGE POWER

Номер: US20130301117A1
Автор: Kaertner Franz X., Zapata Luis E.
Принадлежит:

An inventive composite optical gain medium capable includes a thin-disk gain layer bonded to an index-matched cap. The gain medium's surface is shaped like a paraboloid frustum or other truncated surface of revolution. The gain medium may be cryogenically cooled and optically pumped to provide optical gain for a pulsed laser beam. Photons emitted spontaneously in the gain layer reflect off or refract through the curved surface and out of the gain medium, reducing amplified spontaneous emission (ASE). This reduces limits on stored energy and gain imposed by ASE, enabling higher average powers (e.g., 100-10,000 Watts). Operating at cryogenic temperatures reduces thermal distortion caused by thermo-mechanical surface deformations and thermo-optic index variations in the gain medium. This facilitates the use of the gain medium in an image-relayed, multi-pass architecture for smoothed extraction and further increases in peak pulse energy (e.g., to 1-100 Joules). 1. An optical gain medium comprising:a gain layer having a first refractive index; andan index-matched layer, bonded to the gain layer, having a second refractive index substantially equal to the first refractive index,wherein the optical gain medium has an exterior surface that is at least partially defined by revolving a two-dimensional curve about the longitudinal axis of the optical gain medium.2. The optical gain medium of claim 1 , wherein the gain layer comprises at least one of Yb:YAG claim 1 , Yb:YLF claim 1 , Nd:YAG claim 1 , Yb:LuAG claim 1 , Yb:SrF claim 1 , Tm:YAG claim 1 , Yb:GGG claim 1 , Yb:KYW claim 1 , Yb:KGW claim 1 , Yb:KLuW claim 1 , Yb:LuO claim 1 , Yb:YO claim 1 , Yb:S-FAP claim 1 , and Yb:Calgo.3. The optical gain medium of claim 1 , wherein the gain layer has a thickness of about 0.01 mm to about 1.0 mm and a maximum outer diameter of about 1.0 mm to about 100 mm.4. The optical gain medium of claim 1 , wherein the index-matched layer comprises at least one of YAG claim 1 , YLF LuAG claim ...

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Номер записи: 77
14-11-2013 дата публикации

HIGH SPECTRAL-PURITY CARRIER WAVE GENERATION BY NONLINEAR OPTICAL MIXING

Номер: US20130301664A1
Автор: Murakowski Janusz, Prather Dennis W., Schneider Garrett
Принадлежит: PHASE SENSITIVE INNOVATIONS, INC.

Signal generating systems and methods are described. One signal generation system includes first and second lasers configured to generate first and second laser beams having respective frequencies wherein a difference in the respective frequencies corresponds to an output frequency, a photodetector configured to produce a signal at the output frequency, and first and second electro-optic modulators configured to respectively electro-optically modulate the first and second laser beams using the signal to produce respective first and second modulated optical signals, each of the first and second modulated optical signals having a respective sideband corresponding to the frequency of the other one of the first and second laser beams. The first laser is seeded with the respective sideband of the second modulated optical signal and the second laser is seeded with the respective sideband of the first modulated optical signal to phase-lock the first and second laser beams to each other. 1. A signal generating system comprising:first and second lasers configured to generate first and second laser beams having respective frequencies wherein a difference in the respective frequencies corresponds to an output frequency;a photodetector configured to mix the first and second laser beams to produce a signal at the output frequency; and 'wherein the first laser is seeded with the respective sideband of the second modulated optical signal and the second laser is seeded with the respective sideband of the first modulated optical signal to phase-lock the first and second laser beams to each other.', 'first and second electro-optic modulators (EOMs) configured to respectively electro-optically modulate the first and second laser beams using the signal to produce respective first and second modulated optical signals, each of the first and second modulated optical signals having a respective sideband corresponding to the frequency of the other one of the first and second laser beams,'}2 ...

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Номер записи: 78
14-11-2013 дата публикации

LUMINESCENT MATERIAL, AND ORGANIC LIGHT-EMITTING ELEMENT, WAVELENGTH-CONVERTING LIGHT-EMITTING ELEMENT, LIGHT-CONVERTING LIGHT-EMITTING ELEMENT, ORGANIC LASER DIODE LIGHT-EMITTING ELEMENT, DYE LASER, DISPLAY DEVICE, AND ILLUMINATION DEVICE USING SAME

Номер: US20130303777A1
Автор: Fujita Yoshimasa, Itoh Akinori, Itoh Tetsuji, Ogata Hidenori, Ohe Masahito, Okamoto Ken, Yamada Makoto
Принадлежит: SHARP KABUSHIKI KAISHA

A luminescent material includes a transition metal complex which comprises any one of Ir, Os, and Pt as a central metal; and at least one of a carbene ligand and a silylene ligand. The carbene ligand includes a boron atom in a skeleton thereof. The carbene ligand is neutral or monoanionic. The carbene ligand is monodentate, bidentate, or tridentate. The silylene ligand includes a boron atom in a skeleton thereof. The silylene ligand is neutral or monoanionic. The silylene ligand is monodentate, bidentate, or tridentate. 1. A luminescent material comprising:a transition metal complex, wherein the transition metal complex comprises:any one of Ir, Os, and Pt as a central metal; andat least one of a carbene ligand and a silylene ligand, wherein the carbene ligand includes a boron atom in a skeleton thereof, wherein the carbene ligand is neutral or monoanionic, wherein the carbene ligand is monodentate, bidentate, or tridentate, wherein the silylene ligand includes a boron atom in a skeleton thereof, wherein the silylene ligand is neutral or monoanionic, wherein the silylene ligand is monodentate, bidentate, or tridentate.7. The luminescent material according to claim 1 ,wherein the transition metal complex is a tris complex in which three bidentate ligands are coordinated, andwherein the amount of a mer (meridional) isomer contained in the transition metal complex is greater than that of a fac (facial) isomer.8. An organic light-emitting element comprising:at least one organic layer that includes a light-emitting layer; anda pair of electrodes between which the organic layer is interposed,wherein the organic layer includes a transition metal complex,wherein the transition metal complex comprises:any one of Ir, Os, and Pt as a central metal; andat least one of a carbene ligand and a silylene ligand, wherein the carbene ligand includes a boron atom in a skeleton thereof, wherein the carbene ligand is neutral or monoanionic, wherein the carbene ligand is monodentate, ...

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Номер записи: 79
28-11-2013 дата публикации

Multiple Aperture Hand-Held Laser Therapy Apparatus

Номер: US20130317571A1
Автор: Gerlitz Yonatan
Принадлежит:

A hand-held therapeutic laser apparatus with a special opto-mechanical construction, which enables changeability of a front collimating lens to create different effective laser apertures. A smaller effective aperture has a comparatively higher radiant flux density for treatment of a small area that requires a higher energy dose, while a larger effective aperture facilitates treatment of a large area at a relatively reduced radiant intensity. 1. A hand-held laser apparatus comprising:a laser diode that is adapted to produce a monochromatic laser beam;a front lens adapted to receive the beam directly from the laser diode and exploit the natural beam divergence of the laser diode to form an substantially coherent monochromatic, collimated output beam; wherein the formed beam defines on a plane perpendicular to the direction of propagation of the beam an elongated illuminated area in which the length of the illuminated area is at least twice the size of the width of the illuminated area;a controller that is adapted to control activation of the laser diode; andan encasement enclosing the laser diode, the lens and the controller;wherein the encasement is adapted to be hand-held, and the optical-mechanical configuration of the apparatus allows a changing of the front lens and thus of the effective aperture and radiant intensity of the output beam.2. A therapeutic laser apparatus comprising:an encasement adapted to be hand-held;a base assembly in the encasement, comprising a laser diode for generating a monochromatic laser beam whereby a diverging laser beam is emitted from the base assembly; and a lens mount having an axial dimension; and', 'a collimating lens on the lens mount for creating an approximately coherent final beam;, 'at least two head assemblies removably enagageable with the base assembly, each head assembly comprisingwherein the axial dimension of the lens mount of a first one of the head assemblies is different from the axial dimension of the lens mount of ...

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Номер записи: 80
05-12-2013 дата публикации

DRIVE LASER FOR EUV LIGHT SOURCE

Номер: US20130321901A1
Автор: BOWERING Norbert R., Ershov Alexander I., Fomenkov Igor V., Hoffman Jerzy R.
Принадлежит: CYMER, LLC

A device comprising a laser source producing a continuous output on a beam path and an amplifier is disclosed. The device further includes a partially transmissive, partially reflective optic disposed on said beam path between said laser source and said amplifier. The device further includes a droplet generator positioned to deliver a droplet moving on a path intersecting said beam path, the droplet reflecting light to establish an optical cavity with said optic. 1. A device comprising:{'sub': 'o', 'an oscillator having an oscillator cavity length, L, and defining an oscillator path;'}{'sub': combined', 'combined', 'o, 'a multi-pass optical amplifier coupled with said oscillator to establish a combined optical cavity including the oscillator path, the combined cavity having a length, L, where L=(N+x)*L, where “N” is an integer and “x” is a number between 0.4 and 0.6.'}2. A device as recited in wherein said oscillator cavity comprises an optic defining an end of the oscillator cavity and the device comprises an electro-actuable element coupled to the optic and controllable to adjust the oscillator cavity length.3. A device as recited in wherein the amplifier comprises a polarization discriminating optic inputting light traveling along a first beam path from the oscillator and having substantially a first linear polarization into the amplifier and outputting light having substantially a linear polarization orthogonal to said first polarization out of said amplifier along a second beam path.4. A device as recited in wherein the oscillator comprises an oscillator output optic claim 1 , the amplifier comprises an amplifier input optic and the device further comprises at least one moveable optic to adjust a beam path length between said oscillator output optic and said amplifier input optic.5. A device as recited in wherein the oscillator comprises a cavity dumped oscillator.6. A device comprising:a target material;at least one optic establishing a beam path with the ...

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Номер записи: 81
12-12-2013 дата публикации

METHOD AND APPARATUS FOR CONTROLLING AND PROTECTING PULSED HIGH POWER FIBER AMPLIFIER SYSTEMS

Номер: US20130329279A1
Автор: BENDETT, CHO, GILLIS, HARTER, HARTL, JR. Donald J., JR. Gyu C., JR. Ingmar, JR. Mark, JR. Otho E., JR. Wayne A., NATI Salvatore F., Ulrich
Принадлежит: IMRA AMERICA, INC.

An electronic circuit for controlling a laser system consisting of a pulse source and high power fiber amplifier is disclosed. The circuit is used to control the gain of the high power fiber amplifier system so that the amplified output pulses have predetermined pulse energy as the pulse width and repetition rate of the oscillator are varied. This includes keeping the pulse energy constant when the pulse train is turned on. The circuitry is also used to control the temperature of the high power fiber amplifier pump diode such that the wavelength of the pump diode is held at the optimum absorption wavelength of the fiber amplifier as the diode current is varied. The circuitry also provides a means of protecting the high power fiber amplifier from damage due to a loss of signal from the pulse source or from a pulse-source signal of insufficient injection energy. 1. A high power fiber amplifier system comprising:a passively mode locked oscillator generating optical pulses at a repetition rate;a diode pumped fiber amplifier disposed downstream from said oscillator and arranged to receive at least a portion of said optical pulses from said oscillator; anda controller operatively coupled to at least said passively mode locked oscillator, said controller comprising an element for monitoring a repetition rate of said passively mode locked oscillator, said element comprising a photodetector to receive and convert a fraction of the optical power of said optical pulses from said passively mode locked oscillator into electrical signals representative of said repetition rate, said controller capable of determining said repetition rate from said electrical signals and calculating a required down counter divide ratio needed to obtain a desired lower repetition rate, and wherein said controller is arranged to dynamically control a gain of said fiber amplifier or to control the amplitude of a seed pulse so as to maintain a desired output pulse energy from said high power amplifier ...

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Номер записи: 82
19-12-2013 дата публикации

Femtosecond laser apparatus and femtosecond laser system including the same

Номер: US20130336345A1
Автор: Andrey Kulik, Dae Sik Lee, Elena Sall, Guang Hoon Kim, Ju Hee Yang, Sergey Chizhov, Uk Kang, Vladimir Yashin
Принадлежит: Korea Electrotechnology Research Institute KERI

There is disclosed a femtosecond laser apparatus including a first laser material comprising Ng, Np and Nm axes spatially perpendicular to each other; a second laser material comprising Np axis, Nm axis and Ng axis; and a first laser diode and second laser diodes, wherein the traveling direction of laser beams generated from the first and second laser materials is substantially parallel to Ng axis of the first laser material and the polarizing direction of laser beams generated from the first and second laser materials is substantially parallel to Np axis of the first laser material, and the traveling direction of laser beams generated from the first and second laser materials is substantially parallel to Np axis of the second material and the polarizing direction of laser beams generated from the first and second laser materials is substantially parallel to Nm axis of the second laser material.

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Номер записи: 83
26-12-2013 дата публикации

External Cavity Wideband Tunable Laser with Dual Laser Gain Media Coupled by a Thin Film Filter Including

Номер: US20130343414A1
Автор: Gao Peiliang
Принадлежит: GP PHOTONICS INC

The invention relates to an external cavity wideband tunable laser with dual laser gain media coupled by a thin film filter. The laser comprises: a first laser gain medium, a first laser cavity end mirror arranged on the first laser gain medium, a first intracavity collimating lens, an active optical phase modulator, a tunable acousto-optic filter, an intracavity reflection mirror, an etalon and a total reflection mirror, which are all arranged sequentially inside the laser cavity. The laser further comprises a second laser gain medium, a second laser cavity end mirror arranged on the second laser gain medium, a second intracavity collimating lens, a thin film optical filter for coupling the output light beams emitted from the first laser gain medium and the second laser gain medium, a radio frequency signal source, pumping sources for the two laser gain media, an active optical phase modulator drive source and a laser drive control circuit. The invention expands the output spectrum range of a single tunable laser and is capable of covering C and L spectrum bands. The laser has reliable performance with stable output and compact size, low cost for volume production and easy installation. 1. An external cavity wideband tunable laser with dual laser gain media coupled by a thin film filter including: a first laser gain medium , a first laser cavity end mirror arranged on the first laser gain medium , a first intracavity collimating lens , an active optical phase modulator , a tunable acousto-optic filter , an intracavity reflection mirror , which are all arranged sequentially , an etalon and a total reflection mirror , which are arranged on the opposite side of the tunable acousto-optic filter from the intracavity reflection mirror , the laser further comprises:a second laser gain medium, a second laser cavity end mirror arranged on the second laser gain medium, a second intracavity collimating lens, the optical axes of second laser gain medium and the second ...

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Номер записи: 84
09-01-2014 дата публикации

LIGHT SOURCE FOR AIMING, TARGET ACQUISITION, COMMUNICATION AND TRACKING

Номер: US20140010245A1
Автор: Flaster Adam Daniel, Flaster Jonathan Kiva
Принадлежит:

A light generation and emission system and method is disclosed. A light generator generates light from a diode at a wavelength between 300 nm and 490 nm. A light beam forming subsystem forms the light to a directional light beam, and a controller that controls and directs the directional light beam to a target. The light generator can be suitably used for aiming, target acquisition, communication, identification, scanning, surveying, tracking, ignition and weapons operation. 1. A method comprising:generating light from a diode, the light being generated at a wavelength between 10 nm to 490 nm; andforming the light to a directional light beam; andcontrolling to the directional light beam to direct the directional light beam at a target.2. A system comprising:a light generator that generates light from a diode at a wavelength between 10 nm and 490 nm;a light beam forming subsystem that forms the light to a directional light beam; anda controller that controls and directs the directional light beam to a target.3. A light emission system comprising: a diode that emits light at a wavelength between 10 nm and 490 nm;', 'a power regulator that provides power to the diode at a specific power level;', 'a controller responsive to input signals for controlling the power regulator to generate the power at the specific power level; and', 'optics for forming and directing the light from the diode into a directional light beam that is output through the outlet aperture., 'a housing having at least one outlet aperture, the housing containing4. The light emission system in accordance with claim 3 , wherein the housing further contains an energy source for providing electrical energy to the power regulator.5. The light emission system in accordance with claim 3 , wherein the housing further includes an input control for providing the input signals to the controller.6. The light emission system in accordance with claim 3 , wherein the optics includes one or more lenses configured to ...

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Номер записи: 85
09-01-2014 дата публикации

Passive q-switch-type solid laser apparatus

Номер: US20140010247A1
Автор: Rakesh Bhandari, Simon Joly, Takunori Taira
Принадлежит: Inter University Research Institute Corp National Institute of Natural Sciences

To provide a passive Q-switch-type solid laser apparatus for outputting a high peak-power pulse laser whose pulse energy is large and pulse-time width is small. A passive Q-switch-type solid laser apparatus has: two reflection elements for forming an oscillator; a solid gain medium being disposed between the two reflection elements; a saturable absorber being disposed between the two reflection elements; an excitation device for exciting the solid gain medium; and a cross section control device for making at least one of a stimulated emission cross section of the solid gain medium and an absorption cross section of the saturable absorber closer to another one of them; and the cross section control device is equipped with at least one or both of a temperature control device for retaining the solid gain medium at a predetermined temperature and an oscillatory-wavelength control device for fixating an oscillatory wavelength at a predetermined wavelength.

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Номер записи: 86
09-01-2014 дата публикации

Precision Optical Frequency Tunable Laser

Номер: US20140010250A1
Автор: Gao Peiliang
Принадлежит: GP PHOTONICS INC

The invention relates to a precision optical frequency tunable laser. The laser includes: a laser gain medium, an intracavity collimating lens, an active optical phase modulator, a tunable acousto-optic filter and an intracavity total reflection mirror all arranged sequentially in a laser cavity, and the tunable laser further includes an active polarization rotator, a polarization beam splitter, two etalons, a temperature control system attached to the etalons, two total reflection mirrors, a radio frequency signal source, a laser pumping source, an active optical phase modulator drive source, an active polarization rotator drive source and a laser drive control circuit. Through the temperature control system attached to the etalons, stable laser output and the precision optical frequency tuning less than 1 GHz within a wide spectrum range can be realized, thereby greatly reducing the bandwidth requirements in achieving narrowband filtering for the tunable acousto-optic filter. The invention is compact with high performance, low cost for volume production and installation, and achieves stable tunable laser output within a wide spectrum range. 1. A precision optical frequency tunable laser comprising a laser gain medium , a laser cavity end mirror arranged on the laser gain medium , an intracavity collimating lens , an active optical phase modulator , a tunable acousto-optic filter and an intracavity total reflection mirror all arranged sequentially inside the laser cavity and in such a way that the light beam emitted from the laser gain medium can be diffracted twice by the tunable acousto-optic filter and the frequency shift introduced by the diffractions can be compensated , the laser further comprises:an active polarization rotator for controlling the polarization direction of linearly polarized incident light, the active polarization rotator is arranged on the opposite side of the tunable acousto-optic filter from the intracavity total reflection mirror to ...

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Номер записи: 87
09-01-2014 дата публикации

Tunable Pumping Light Source for Optical Amplifiers

Номер: US20140010251A1
Автор: Ian Peter McClean, Jan Lewandowski, Nadhum Kadhum Zayer
Принадлежит: OCLARO TECHNOLOGY LTD

A tunable external cavity laser for use as a pump laser in an optical amplifier such as a Raman amplifier or erbium doped fibre amplifier comprising a semiconductor gain device ( 12 ) operable to provide light amplification, a diffraction grating ( 18 ) for selecting the wavelength of operation of the laser and a MEMs actuator for changing the selected wavelength. A plurality of gain devices can be coupled together to improve the bandwidth or gain of the optical amplifier.

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Номер записи: 88
16-01-2014 дата публикации

SEMICONDUCTOR DISK LASER FOR NONLINEAR MICROSCOPY APPLICATIONS IN LIVING ORGANISMS

Номер: US20140016185A1
Автор: Barbarin Yohan, Hamilton Craig, Keller Ursula, Loza-Alvarez Pablo, Malcolm Graeme, Rafailov Edik, Sudmeyer Thomas, Weingarten Kurt
Принадлежит: THE UNIVERSITY OF DUNDEE

A mode locked semiconductor disk laser with an output beam having an ultra-short pulse length which provides the incident beam to a non linear microscope. The wavelength of the beam is at or near the action cross section maximum absorption wavelength for creating two photon excited fluorescence of a fluorescent biological marker in a sample. Semiconductor disk lasers combine excellent beam quality and output power, stability while maintaining simplicity and easiness of operation. In addition, these types of lasers are ideally suited for mass production as they are built in wafer-scale technology enabling a high level of integration. Importantly this non expensive, turn-key, compact laser system could be used as a platform to develop portable non-linear bio-imaging devices for clinical studies, facilitating its wide-spread adoption in “real-life” applications. 1. A non-linear microscope with an incident beam which comprises a mode locked semiconductor disk laser having an ultra-short pulse length , wherein the wavelength of the laser beam is at or near the action cross section maximum wavelength for creating two photon excited fluorescence of a fluorescing biological marker in a sample.2. A non-linear microscope as claimed in wherein claim 1 , the laser is mode-locked with a semiconductor saturable absorber mirror (SESAM).3. A non-linear microscope as claimed in wherein the laser is mode-locked with a quantum-dot semiconductor saturable absorber mirror (SESAM).4. A non-linear microscope as claimed in wherein the laser is mode-locked with a quantum-well semiconductor saturable absorber mirror (SESAM).5. A non-linear microscope as claimed in wherein claim 3 , the laser has a cavity which is formed by a SESAM and a curved output coupling mirror which form the end-mirrors of the laser cavity.6. A non-linear microscope as claimed in wherein the laser is mode locked using a diamond heat spreader.7. A non-linear microscope as claimed in wherein the diamond heat spreader is ...

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Номер записи: 89
16-01-2014 дата публикации

WAVELENGTH CONVERSION CRYSTAL AND WAVELENGTH CONVERSION LASER DEVICE

Номер: US20140016186A1
Автор: Fujikawa Shuichi, Furuta Keisuke, Katsura Tomotaka, Konno Susumu
Принадлежит: Mitsubishi Electric Corporation

A wavelength conversion crystal including: a single nonlinear optical crystal which satisfies both of a first phase-matching condition and a second phase-matching condition, the first phase-matching condition being required for first wavelength conversion to convert a fundamental wave having a wavelength of 1064 nm into a second harmonic having a wavelength of 532 nm, and the second phase-matching condition being required for second wavelength conversion to convert the light having a wavelength of 532 nm into a fourth harmonic having a wavelength of 266 nm; and a first reflective face and a second reflective face for reflecting the light having a wavelength of 532 nm generated by the first wavelength conversion to supply it to the second wavelength conversion. This approach can efficiently generate a third or higher-order harmonic with a reliable and simple configuration. 114-. (canceled)15. A wavelength conversion crystal comprising:a single wavelength conversion crystal which can satisfy both of a first phase-matching condition and a second phase-matching condition at a same temperature, the first phase-matching condition being required for first wavelength conversion to convert first wavelength light into second wavelength light, and the second phase-matching condition being required for second wavelength conversion to convert the second wavelength light into a third wavelength light; andat least two reflective faces having different orientations, for reflecting the second wavelength light generated at least by the first wavelength conversion,wherein both of the first wavelength conversion and the second wavelength conversion are performed by allowing a propagation orientation and a polarization direction of the second wavelength light generated by the first wavelength conversion to coincide with those of the second phase-matching condition using at least twice reflection from said reflective faces.16. The wavelength conversion crystal according to claim 15 , ...

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Номер записи: 90
16-01-2014 дата публикации

Multi-chip ops-laser

Номер: US20140016657A1
Автор: Qi-Ze Shu
Принадлежит: Coherent Inc

A two-chip OPS laser includes first and second OPS-chips each emitting the same fundamental wavelength in first and second resonators. The first and second resonators are interferometrically combined on a common path terminated by a common end-mirror. The interferometric combination provides for automatic wavelength-locking of the laser, which can eliminate the need for a separate wavelength selective device in the laser.

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Номер записи: 91
30-01-2014 дата публикации

LASER APPARATUS AND PHOTOACOUSTIC APPARATUS

Номер: US20140031667A1
Автор: Ichihara Shigeru, Kobayashi Shuichi
Принадлежит: CANON KABUSHIKI KAISHA

A laser apparatus includes a laser medium; a light source that radiates light to the laser medium, thereby exciting the laser medium and raising the temperature thereof; a reflecting unit having a first plane that reflects light within a predetermined wavelength range from light generated by excitation of the laser medium; and an output mirror disposed opposite the reflecting unit, with the laser medium being interposed therebetween, and causing laser oscillation by inducing resonance of the light within a predetermined wavelength range between the first plane and the output mirror. The reflecting unit is configured to be movable between a position in which light resonance is induced between the output mirror and the first plane and the laser apparatus is set to an oscillation state and a position in which the laser apparatus is set to a non-oscillation state. 1. A laser apparatus comprising:a laser medium;a light source that radiates light to said laser medium, thereby exciting said laser medium and raising a temperature of said laser medium;a reflecting unit having a first plane that reflects light within a predetermined wavelength range from light generated by excitation of said laser medium; andan output minor disposed opposite said reflecting unit, with said laser medium being interposed therebetween, and causing laser oscillation by inducing resonance of the light within a predetermined wavelength range between said first plane and said output minor,wherein said reflecting unit is configured to be movable between a position in which light resonance is induced between said output minor and said first plane and the laser apparatus is set in an oscillation state and a position in which the laser apparatus is set in a non-oscillation state.2. The laser apparatus according to claim 1 , wherein said reflecting unit includes a second plane that transmits the light within a predetermined wavelength range claim 1 , and said second plane assumes a position opposite said ...

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Номер записи: 92
06-03-2014 дата публикации

LASER DEVICE

Номер: US20140064307A1
Автор: TAKADA Yasutoshi, Tani Yoshiro
Принадлежит: NIKON CORPORATION

A laser device includes a partially reflective mirror for separating laser light into monitor light and output light, a light output monitor device for detecting the intensity of the monitor light from the partially reflective mirror, a controller for controlling the intensity of the output light from the partially reflective mirror by controlling the output of a laser light source on the basis of a detection value of the light output monitor device, and a power meter device for detecting the intensity of the output light from the partially reflective mirror during a predetermined calibration time period, wherein the controller calibrates the output of the light output monitor device on the basis of a detection value of the power meter device. 1. A laser device comprising:a laser light output unit for outputting laser light;a light separator for separating the laser light from the laser light output unit into monitor light and output light;a light output monitor for detecting an intensity of the monitor light from the light separator;a light output controller for controlling an intensity of the output light from the light separator by controlling the output of the laser light output unit on the basis of a detection value of the light output monitor; anda light intensity detector for detecting the intensity of the output light from the light separator during a predetermined calibration time period, whereinthe light output controller calibrates a light detection sensitivity of the light output monitor on the basis of a detection value of the light intensity detector, andthe output light is fully reflected into the light intensity detector.2. The laser device according to claim 1 , wherein the laser light output unit is configured to have a laser light generator for generating fundamental-wave laser light claim 1 , and a wavelength converter for converting a wavelength of the fundamental-wave laser light from the laser light generator and outputting the resulting light ...

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Номер записи: 93
06-03-2014 дата публикации

LASER APPARATUS AND METHOD FOR PROCESSING OBJECTS WITH A LASER WHICH IS CONTROLLABLE IN TERMS OF THE PULSE ENERGY

Номер: US20140064308A1
Автор: Mysliwitz Daniel
Принадлежит: BUNDESDRUCKEREI GMBH

A laser processing apparatus, a filter device and a method are used for controlling a pulse laser, which is controllable in terms of its pulse energy and of a temporal triggering of laser pulses, during material processing of an object, in particular during the marking of a plastics-based document. The method includes comparing a pulse energy signal which assumes voltage values, in temporal correlation with a clock signal, which represent a pulse energy for the laser pulses for processing, with a threshold value condition and generating a logic result signal. The clock signal is passed to a gate and controlling the gate using the logic result signal and generating a retrieval signal thereby. An energy control signal is provided which has a voltage according to a specification of a control voltage. The retrieval signal and the energy control signal are used to control the pulse laser. 111-. (canceled)12. A laser processing apparatus for laser processing of an object , comprising:a pulsed laser controllable with regard to laser pulse energy and a temporal retrieval of laser pulses, said pulsed laser having an energy control input for receiving an analog signal with a voltage controlling the laser pulse energy, and a retrieval input for receiving a signal by means of which a retrieval of the laser pulses is controllable temporally;a control device, configured to generate, on a basis of processing information, a pulse energy signal which, in a manner temporally correlated with a clock signal assumes voltage values which represent the laser pulse energy for the laser pulses which are retrievable by means of the clock signal; a comparator device for comparing a voltage of the pulse energy signal with at least one predefinable threshold value condition and generating a logic result signal;', 'a gate, to which the clock signal is passed, said gate being controlled by means of the logic result signal and thereby generating and outputting a retrieval signal; and', 'an ...

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Номер записи: 94
13-03-2014 дата публикации

System and Method for Seed Laser Mode Stabilization

Номер: US20140072006A1
Автор: Sandstrom Richard L.
Принадлежит: CYMER, INC.

A method and apparatus for stabilizing the seed laser in a laser produced plasma (LPP) extreme ultraviolet (EUV) light system are disclosed. In one embodiment, the cavity length of the laser may be adjusted by means of a movable mirror forming one end of the cavity. The time delay from the release of an output pulse to the lasing threshold next being reached is measured at different mirror positions, and a mirror position selected which results in a cavity mode being aligned with the gain peak of the laser, thus producing a minimum time delay from an output pulse of the laser to the next lasing threshold. A Q-switch in the laser allows for pre-lasing and thus jitter-free timing of output pulses. Feedback loops keep the laser output at maximum gain and efficiency, and the attenuation and timing at a desired operating point. 1. A system for producing output laser pulses , comprising:a laser having an optical cavity including a movable optical component, such that moving the optical component changes the length of the optical cavity, and lasing when power in the optical cavity reaches a lasing threshold;an actuator for positioning the optical component within a predetermined range;a variable attenuator in the optical cavity for limiting the rate at which power in the laser increases and thus controlling the time at which the lasing threshold is reached and the time at which the output pulse is released;a sensor for measuring the output power of the laser at a given moment;a computing device for calculating the time delay from the release of an output pulse to the time the lasing threshold is again reached; anda first feedback loop having a first controller for causing the actuator to position the optical component so that the time delay from the release of an output pulse to the time the lasing threshold is again reached is at a minimum.2. The system of further comprising a second feedback loop having a second controller for causing an adjustment in the variable ...

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Номер записи: 95
20-03-2014 дата публикации

Image Display Apparatus and Electronic Apparatus Having Projector Function

Номер: US20140079080A1
Автор: NISHIOKA Ken
Принадлежит: FUNAI ELECTRIC CO., LTD.

This image display apparatus includes a plurality of laser beam source portions outputting laser beams of a plurality of color components different from each other, a synthesized beam generation portion synthesizing the laser beams of the plurality of color components, a control portion controlling the outputs of the laser beam source portions, and a driving current correction portion estimating a variation in the threshold current of each of the laser beam source portions and correcting a driving current on the basis of the estimated variation in the threshold current. 1. An image display apparatus comprising:a plurality of laser beam source portions outputting laser beams of a plurality of color components different from each other;a synthesized beam generation portion synthesizing the laser beams of the plurality of color components;a control portion controlling outputs of the laser beam source portions; anda driving current correction portion estimating a variation in a threshold current of each of the laser beam source portions and correcting a driving current on the basis of an estimated variation in the threshold current.2. The image display apparatus according to claim 1 , whereinthe driving current correction portion is configured to estimate the variation in the threshold current by calculating an amount of change of the threshold current for each prescribed time and summing the amount of change of the threshold current.3. The image display apparatus according to claim 2 , whereinthe driving current correction portion is configured to update the threshold current by adding the amount of change of the threshold current for each prescribed time to a present threshold current so as to estimate the variation in the threshold current.4. The image display apparatus according to claim 1 , whereinthe driving current correction portion is configured to employ the threshold current at a projection start position of one frame as an initial value of the threshold ...

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Номер записи: 96
27-03-2014 дата публикации

DEVICE FOR GENERATING ELECTROMAGNETIC RADIATION

Номер: US20140086269A1
Автор: SCHOLZ Matthias
Принадлежит: TOPTICA PHOTONICS AG

The invention relates to a device for generating electromagnetic radiation, said device comprised of a light source () generating a first radiation () at a fundamental wavelength, an optical resonator () in which the first radiation () circulates, and a frequency multiplier () located in the optical resonator () which converts the first radiation () at least partly into a second radiation () at a second or higher harmonic wavelength, wherein the said frequency multiplier () comprises at least one non-linear crystal (). The invention proposes that at least one beam splitter element () passed through by the first radiation () and the second radiation () is coupled to the non-linear crystal (), wherein the first radiation () and the second radiation () leave the beam splitter element () each in a different spatial direction. 22345679127292. Device according to claim 1 , wherein the resonator () is comprised of two or more reflectors ( claim 1 , claim 1 , claim 1 , ) which according to the spatial directions in which the first and the second radiation ( claim 1 , ) leave the beam splitter element () are so arranged claim 1 , aligned and/or shaped that only the first radiation () circulates in the optical resonator () and the second radiation () leaves the optical resonator ().3679. Device according to claim 2 , wherein at least one of the reflectors () is so arranged claim 2 , aligned or shaped that it only reflects the first radiation () and that the second radiation () passes the reflector.41279101210. Device according to claim 1 , wherein the beam splitter element () is a body transparent to the first and second radiation ( claim 1 , ) claim 1 , said body tied to a surface of the non-linear crystal () claim 1 , wherein the refractive index of the material of the beam splitter element () with the second or higher harmonic wavelength differs from the refractive index of the material of the non-linear crystal ().51210. Device according to claim 4 , wherein the ...

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Номер записи: 97
03-04-2014 дата публикации

Ultrabright long biphoton generation with non-linear optical material

Номер: US20140092467A1
Автор: Chuu Chih Sung, Harris Stephen E., Yin Guang-Yu
Принадлежит:

Improved production of entangled photon pairs (biphotons) via spontaneous parametric down conversion (SPDC) is provided. In one aspect, forward-wave SPDC is performed in a monolithic resonator (resonant for both signal and idler) having a double pass pump geometry to provide a spectrally bright source of biphotons. In another aspect, backward-wave SPDC is performed in a resonator (resonant for both signal and idler) to provide a spectrally bright source of biphotons. For either of these approaches, the biphotons can be made to have polarization entanglement by using quasi phasematching (QPM) with two QPM periods simultaneously. 1. A biphoton source comprising:a source of pump radiation; anda nonlinear optical medium configured to receive the pump radiation and to provide phase-matched spontaneous parametric down-conversion (SPDC) of the pump radiation to provide co-propagating signal radiation and idler radiation;wherein the nonlinear optical medium comprises two endfaces of the medium coated to reflect both the signal radiation and the idler radiation, and having endface curvatures such that a monolithic optical resonator is formed for both the signal radiation and the idler radiation in the nonlinear optical medium;wherein the source of pump radiation is configured to provide the pump radiation at an intensity that is less than a pump intensity threshold for optical parametric oscillation in the nonlinear optical medium.2. The biphoton source of claim 1 , further comprising a coating on one of the endfaces to reflect the pump radiation claim 1 , whereby the pump radiation makes a double pass through the nonlinear optical medium.3. The biphoton source of claim 1 , wherein the signal radiation and the idler radiation have orthogonal polarizations.4. The biphoton source of claim 1 , wherein the signal radiation and the idler radiation have parallel polarizations.5. The biphoton source of claim 1 , wherein the signal radiation and the idler radiation have different ...

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Номер записи: 98
03-04-2014 дата публикации

Optical pulse apparatus and method

Номер: US20140092925A1
Автор: Anatoly Borisovich Grudinin, Ian Michael Godfrey, John Redvers Clowes, Kestutis Vysniauskas
Принадлежит: Fianium Ltd

The invention can include an apparatus for producing optical pulses, comprising an oscillator for producing optical pulses at a first optical pulse repetition frequency, the optical pulses having a first wavelength and a first time duration; a pulse picker for receiving optical pulses having the first optical pulse repetition frequency, first wavelength and first time duration and operable to reduce the optical pulse repetition frequency to produce optical pulses having the first wavelength, first time duration and a reduced optical pulse repetition frequency that is less than the first optical pulse repetition frequency; an optical fiber receiving optical pulses at the reduced optical pulse repetition frequency and having the first wavelength and first time duration to produce, at the reduced optical pulse frequency, optical pulses that include one or more nonlinearly produced wavelengths different than the first wavelength.

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Номер записи: 99
03-04-2014 дата публикации

Laser apparatus and photoacoustic apparatus

Номер: US20140092932A1
Автор: Shigeru Ichihara
Принадлежит: Canon Inc

A laser apparatus that allows selection of a wavelength of output light from a plurality of options. The laser apparatus includes: a resonator made up from an output mirror and reflection means having a plurality of reflective surfaces fixed in position; a laser medium disposed on an optical axis inside the resonator; branch means branching an optical path of a light beam formed on the optical axis when light oscillates in the laser medium into a plurality of optical paths having an end at one reflective surface of the reflection means, the branch means forming a first optical path coinciding with the optical axis when located out of the optical axis, and forming a branch path by moving the light of the optical axis parallel when located on the optical axis.

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Номер записи: 100