Passive q-switch-type solid laser apparatus

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.

Amplifying apparatus and amplifying medium

An amplifying apparatus includes an optical fiber that includes a wound portion doped with a rare earth element and three-dimensionally wound, holes being formed in cladding of the optical fiber and surrounding a core of the optical fiber, the optical fiber transmitting signal light injected thereinto; a thermally conductive member in which the wound portion of the optical fiber embedded, the thermally conductive member having thermal conductivity; a light source that emits excitation light; an injecting unit that injects the excitation light emitted by the light source, into the optical fiber; and a temperature adjusting unit that includes a thermal coupling unit thermally connected to the light source and the thermally conductive member, the temperature adjusting unit adjusting a temperature of the thermal coupling unit.

OBJECT INFORMATION ACQUIRING APPARATUS AND LASER APPARATUS

An object information acquiring apparatus is used which includes: a laser medium; a temperature controlling unit for controlling a temperature of the laser medium; an excitation unit for exciting the laser medium; a control unit for controlling the temperature controlling unit and the excitation unit; a probe for receiving acoustic waves that are generated when an object is irradiated with a laser beam from the laser medium; and a processing unit for acquiring characteristic information relating to the object from the acoustic waves, wherein the control unit does not operate the excitation unit until the temperature of the laser medium falls within a predetermined range. 1. An object information acquiring apparatus , comprising:a laser medium;temperature controlling means configured to control a temperature of the laser medium;excitation means configured to excite the laser medium;control means configured to control the temperature controlling means and the excitation means;a probe configured to receive acoustic waves that are generated when an object is irradiated with a laser beam from the laser medium; andprocessing means configured to acquire characteristic information relating to the object in use of the acoustic waves,wherein the control means does not operate the excitation means until the temperature of the laser medium falls within a predetermined range.2. The object information acquiring apparatus according to claim 1 , further comprising:temperature measuring means configured to measure the temperature of the laser medium,wherein the control means performs control based on the temperature measured with the temperature measuring means.3. The object information acquiring apparatus according to claim 1 ,wherein the temperature controlling means includes a circulator circulating a substance near the laser medium, and heating means heating the substance circulating within the circulator.4. The object information acquiring apparatus according to claim 3 , ...

TUNABLE LIGHT SOURCE

Provided herein is an external-cavity type wavelength tunable laser including gain medium configured to generate an optical signal and amplify the generated optical signal based on a bias current applied; an external reflector configured to be coupled optically with the gain medium; a second thermistor provided on the side of the gain medium and configured to measure a temperature of the gain medium; a first thermistor provided on the external reflector and configured to measure a temperature of the external reflector; and a thermoelectric cooler configured to transfer generated heat based on the temperatures measured by the first and second thermistors.

DEVICE FOR INTERFEROMETRIC DISTANCE MEASUREMENT

A device for interferometric distance measurement includes a multiple wavelength light source, which supplies a light beam having at least three different wavelengths and is configured as a fiber laser, which includes at least three different Bragg gratings, whose grating constants are matched to the wavelengths generated. In addition, an interferometer unit is provided, which splits up the light beam into a measuring light beam and a reference light beam. The measuring light beam propagates in a measuring arm, in the direction of a measuring reflector, and there, it is reflected back; the reference light beam propagates in a reference arm, in the direction of a stationary reference reflector, and there, it is reflected back. The measuring and reference light beams reflected back by the measuring and reference reflectors are superimposed in an interfering manner to form an interference light beam. The interference light beam is split up via a detection unit such that, in each instance, a plurality of phase-shifted, partial interference signals result per wavelength. With the aid of a signal processing unit, an absolute position information item regarding the measuring reflector is determined from the partial interference signals of different wavelengths. 1. A device for interferometric distance measurement , comprising:a multiple wavelength light source adapted to emit a light beam having at least three different wavelengths and arranged as a fiber laser including at least three different Bragg gratings having grating constants matched to the wavelengths;an interferometer unit adapted to split up the light beam into a measuring light beam that propagates in a measuring arm in a direction of a measuring reflector and that is reflected back by the measuring reflector and into a reference light beam that propagates in a reference arm in a direction of a stationary reference reflector and that is reflected back by the reference reflector, the measuring and reference ...

Method for controlling tunable wavelength laser

In the method for controlling a tunable wavelength laser, information designating an oscillation wavelength is inputted. A driving condition for causing laser oscillation at a first wavelength is acquired from a memory. A control value of wavelength characteristics of the etalon and a difference between the first wavelength and a second wavelength are referred to, and a control value of wavelength characteristics of the etalon for causing laser oscillation at the second wavelength is calculated. The control value of wavelength characteristics of the etalon are assigned to the tunable wavelength laser, and a wavelength is controlled so that a wavelength sensing result becomes a first target value. Information indicating a wavelength shift amount from the designated oscillation wavelength is inputted. The wavelength sensing result is calculated as a second target value. The wavelength is controlled so that the wavelength sensing result becomes the second target value.

OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS, OPTICAL INFORMATION RECORDING/REPRODUCING METHOD AND DATA ARCHIVING SYSTEM

In a hologram recording/reproducing apparatus where a wavelength-variable laser diode having the external resonator structure is used as its light-source, stable recording/reproducing quality is ensured with respect to a change in the recording/reproducing wavelength against the expansion or contraction of a hologram medium caused by the hologram recording and the temperature change. When the output wavelength from the wavelength-variable laser diode is changed to a predetermined target wavelength, the temperature of the laser light-emission part of the wavelength-variable laser diode is controlled by a temperature control element so that the wavelength band, within which the light-emission power of the laser light-emission spectrum is higher than a predetermined light-emission power, includes the above-described predetermined target wavelength. 1. A hologram recording/reproducing apparatus for recording information as a hologram by irradiating a signal light and a reference light onto a hologram medium , said information being superimposed on said signal light ,said hologram recording/reproducing apparatus, comprising:an operation control unit for controlling the internal operation of said hologram recording/reproducing apparatus;a wavelength-variable laser light-source which is capable of changing the wavelength of its laser light within a predetermined range, and which is the light source of said signal light and said reference light; anda temperature control element for controlling the temperature of the laser light-emission part of said wavelength-variable laser light-source, wherein,when changing the wavelength of said signal light and said reference light, said temperature of said laser light-emission part of said wavelength-variable laser light-source is changed by said temperature control element.2. The hologram recording/reproducing apparatus according to claim 1 , further comprising:temperature measuring means for measuring the temperature of said ...

MODE-LOCKED AND WAVELENGTH TUNABLE OPTICAL FREQUENCY COMB GENERATION THROUGH DYNAMIC CONTROL OF MICRORESONATORS

A tunable optical comb generator having a source laser configured to generate a continuous wave (CW) light at a first wavelength; and a microresonator coupled to the source laser and configured to receive the CW light and generate an optical signal having a plurality of output wavelengths corresponding to the first wavelength. the generator includes a microresonator tuning device coupled to the microresonator and configured to tune the microresonator to compensate the microresonator for wavelength shifts. A control circuit iscoupled to the microresonator tuning device and configured to generate a control signal to control the microresonator tuning device based on the optical signal. Multiple microresonators in the form of microrings may be included to tune the generator. A heater coupled to the microresonators may be used to adjust the microresonators. 1. A tunable optical comb generator , comprising:a source laser configured to generate a continuous wave (CW) light at a first wavelength;a microresonator coupled to the source laser, configured to receive the CW light and generate an optical signal having a plurality of output wavelengths corresponding to the first wavelength;a microresonator tuning device coupled to the microresonator and configured to tune the microresonator to compensate the microresonator for wavelength shifts; anda control circuit coupled to the microresonator tuning device and configured to generate a control signal to control the microresonator tuning device based on the optical signal.2. The tunable optical comb generator of claim 1 , the microresonator tuning device comprises a heater.3. The tunable optical comb generator of claim 1 , the microresonator tuning device comprises at least one microring.4. The tunable optical comb generator of claim 1 , further comprising:a photodetector coupled to the microresonator and configured to receive the optical signal and convert the optical signal into an electrical signal corresponding to the ...

RESOLUTION OF MODE HOPPING IN THE OUTPUT OF LASER CAVITIES

An optical system includes a laser cavity on a base. The laser cavity generates a light signal in response to application of an electrical current to the laser cavity. The system includes first electronics that apply a target level of the electrical current to the laser cavity so as to cause the laser cavity to generate the light signal. The light signal experiences mode hops at electrical current levels that shift to higher current levels in response to increasing laser operation times. A first one of the mode hops occurs at a first current level and a second one of the mode hops occurs at a second current level that is higher than the first current level. The system also includes a phase shifter that interacts with the laser cavity so as to shift the mode hops to lower current levels than occur in the absence of the phase shifter. 1. An optical system , comprising:a laser cavity on a base, the laser cavity generating a light signal in response to application of an electrical current to the laser cavity, 'the light signal experiencing mode hops at electrical current levels that shift to higher current levels in response to time of operation of laser cavity so as to generate the light signal, a first one of the mode hops occurring at a first current level and a second one of the mode hops occurring at a second current level, the second current level being higher than the first current level and there being no other mode hops that occur at a current level between the first current level and the second current level,', 'first electronics that apply a target level of the electrical current to the laser cavity so as to cause the laser cavity to generate the light signal,'}a phase shifter positioned on the base and interacting with the laser cavity so as to shift the mode hops to lower current levels; andsecond electronics that operate the phase shifter such that the mode hops are shifted to electrical current levels where the target current level is between the first ...

SINGLE-MODE REFLECTOR USING A NANOBEAM CAVITY

An integrated circuit includes an optical reflector with one or two bus optical waveguides and a one-dimensional, photonic crystal nanobeam cavity to provide single-mode reflection with a narrow bandwidth. In particular, the nanobeam cavity may be implemented on a nanobeam-cavity optical waveguide (such as a channel or ridge optical waveguide), which is optically coupled to the one or two bus optical waveguides. The nanobeam-cavity optical waveguide may include notches along a symmetry axis of the nanobeam-cavity optical waveguide that are partially etched from edges of the nanobeam-cavity optical waveguide toward a center of the nanobeam-cavity optical waveguide. Furthermore, a fill factor of the notches may vary as a function of location along the symmetry axis, while a pitch of the notches is unchanged, to define the nanobeam cavity. 1. An integrated circuit , comprising:a substrate;a buried-oxide (BOX) layer disposed on the substrate; and a nanobeam-cavity optical waveguide optically coupled to the first bus optical waveguide, wherein the nanobeam-cavity optical waveguide includes notches along a symmetry axis of the nanobeam-cavity optical waveguide that are partially etched from edges of the nanobeam-cavity optical waveguide toward a center of the nanobeam-cavity optical waveguide; and', 'wherein a fill factor of the notches varies as a function of location along the symmetry axis, while a pitch of the notches is unchanged, to define a nanobeam cavity., 'a first bus optical waveguide; and'}, 'a semiconductor layer disposed on the BOX layer, wherein the semiconductor layer includes an optical reflector, and wherein the optical reflector includes2. The integrated circuit of claim 1 , wherein the nanobeam-cavity optical waveguide includes one of: a ridge optical waveguide claim 1 , and a channel optical waveguide.3. The integrated circuit of claim 1 , wherein the first bus optical waveguide is curved.4. The integrated circuit of claim 1 , wherein tapering of the ...

THERMO-OPTIC INTRACAVITY BEAM SHAPING AND MODE CONTROL WITH DOPED OPTICAL MATERIALS

A laser beam shaping system which has a laser resonator configured to operate at a resonating, first wavelength range to produce an intracavity resonating beam and a laser gain material, configured to produce gain and to amplify the first wavelength range within the laser resonator. The system has at least one doped medium, which is optically transparent at the first wavelength range, which is doped with a dopant, and which is provided intracavity in the laser resonator and at least one absorbed beam input or coupling configured to generate or receive at least one absorbed beam at a second wavelength range which is different from the first wavelength range and which is directed towards the doped medium. The doped medium has a higher absorption characteristic at the second wavelength range than at the first wavelength range, causing the absorbed beam to have a higher absorption than the resonating beam in the doped medium, but which does not provide gain in the first wavelength range. Optical surfaces of the doped medium are coated to be anti-reflective at the first wavelength range and highly transmissive at the second wavelength range. 1. A laser beam shaping system which includes:a laser resonator configured to operate at a resonating, first wavelength range to produce an intracavity resonating beam;a laser gain material, configured to produce gain and to amplify the first wavelength range within the laser resonator;at least one doped medium, which is optically transparent at the first wavelength range, which is doped with a dopant, and which is provided intracavity in the laser resonator;at least one absorbed beam input or coupling configured to generate or receive at least one absorbed beam at a second wavelength range which is different from the first wavelength range and which is directed towards the doped medium,wherein the doped medium has a higher absorption characteristic at the second wavelength range than at the first wavelength range, causing the ...

OPTICAL FIBER WITH LOW THERMO-OPTIC COEFFICIENT

A fiber includes a core and cladding, both of which may have temperature dependent indices of refraction. The materials and size of the core and cladding may be selected such that as the temperature of the core and/or cladding is heated above room temperature, the fiber transitions from supporting multimode optical waveguiding to supporting single mode waveguiding. 1. A fiber including:a cladding; and 'the core and cladding are formed to support multimode guiding at about room temperature and fewer modes guided at a guiding temperature above room temperature.', 'a core, where2. The fiber of claim 1 , where the core is configured to have a thermo-optic coefficient less than that of the cladding.3. The fiber of claim 2 , where the core is configured to have a thermo-optic coefficient that has a negative value.4. The fiber of claim 1 , where the fiber includes at least a portion of a gain medium of a fiber laser or a fiber amplifier.5. The fiber of claim 1 , the core includes a dopant claim 1 , where the dopant includes phosphorus pentoxide claim 1 , aluminum oxide claim 1 , aluminum phosphate claim 1 , boron trioxide claim 1 , fluorine claim 1 , or any combination thereof.6. The fiber of claim 1 , the core is doped with an active ion.7. The fiber of claim 1 , the fiber supports single mode guiding in a guiding temperature range claim 1 , where the guiding temperature range includes the guiding temperature.8. The fiber of claim 7 , where a V-number of the fiber is less than 2.405 when the fiber is within the guiding temperature range claim 7 , where the V-number is defined to be πD√{square root over (n−n)}/λ claim 7 , where is D a diameter of the core claim 7 , nis an index of the core claim 7 , nis an index of the cladding claim 7 , and λ is a wavelength of guided light.9. The fiber of claim 1 , were the fiber supports guiding for three or more modes at room temperature.10. A fiber including:a cladding; and the core and cladding are formed to have a refractive index ...

MONOMODE OPTICAL FIBER DESIGNED TO COMPENSATE FOR A REFRACTIVE INDEX VARIATION RELATED TO THERMAL EFFECTS AND LASER USING SUCH AN OPTICAL FIBER AS A GAIN MEDIUM

A monomode optical fiber, and a process for manufacturing such a fiber, that comprises a monomode core and at least one cladding encircling the core. The monomode core comprises at least two zones, a first zone with at least one first refractive index and a second zone with at least one second refractive index different from the first refractive index. The difference between the first refractive index and the second refractive index is of the same order of magnitude as the variation in the refractive index of the second zone between the inactive state and the active state of the fiber. 121-. (canceled)22. A single-mode optical fiber comprising , from a center to a periphery:a single-mode core;at least one layer of cladding surrounding said core having at least one cladding refractive index, 'the single-mode core comprising at least two zones, a first zone with at least a first refractive index and a second zone with at least a second refractive index that is different from the first refractive index, the difference between the first refractive index and the second refractive index being of a same order of magnitude as a variation in the second refractive index of the second zone caused by a thermal effect between the inactive state and the active state of the fiber.', 'the optical fiber being configured to occupy an inactive state in which the optical fiber is not subject to a thermal load and an active state in which the optical fiber is subject to a thermal load,'}23. The single-mode optical fiber as claimed in claim 22 , wherein the difference between the first refractive index and the second refractive index is smaller than 1×10−3 in the inactive state of the optical fiber.24. The single-mode optical fiber as claimed in claim 22 , wherein the first refractive index is lower than or equal to the cladding refractive index in the inactive state of the optical fiber.25. The single-mode optical fiber as claimed in claim 22 , wherein the second refractive index is ...

PARAMETRIC COMB GENERATION VIA NONLINEAR WAVE MIXING IN HIGH-Q OPTICAL RESONATOR COUPLED TO BUILT-IN LASER RESONATOR

The disclosed technology, in one aspect, includes an optical comb generator device which includes a laser cavity that includes an optical gain material to provide an optical gain and an optical path to allow laser light to circulate inside the laser cavity; and a high-Q resonator optically coupled in the optical path inside the laser cavity so that the laser light generated and sustained inside the laser cavity is in optical resonance with the high-Q resonator to cause laser light stored inside the high-Q resonator to have an optical intensity above a four wave mixing threshold of the high-Q resonator to cause parametric four wave mixing so as to pro duce an optical comb of different optical frequencies. 1. An optical comb generator device , comprising:a laser cavity that includes an optical gain material to provide an optical gain and an optical path to allow laser light to circulate inside the laser cavity; anda high-Q resonator optically coupled in the optical path inside the laser cavity so that the laser light generated and sustained inside the laser cavity is in optical resonance with the high-Q resonator to cause laser light stored inside the high-Q resonator to have an optical intensity above a four wave mixing threshold of the high-Q resonator to cause parametric four wave mixing so as to produce an optical comb of different optical frequencies.2. The device as in claim 1 , wherein:the laser cavity includes a fiber amplifier as the optical gain material, a fiber path for guiding laser light inside the laser cavity.3. The device as in claim 2 , wherein the fiber amplifier includes an erbium-doped fiber amplifier (EDFA) claim 2 , a Ytterbium-doped fiber amplifier claim 2 , a Thulium-doped fiber amplifier or a semiconductor optical amplifier.4. The device as in claim 2 , comprising:a polarization controller inside the laser cavity to control an optical polarization of the laser light inside the laser cavity.5. The device as in claim 4 , wherein the ...

OPTICAL AMPLIFIER, OPTICAL AMPLIFYING SYSTEM, WAVELENGTH CONVERTER, AND OPTICAL COMMUNICATION SYSTEM

An optical amplifier includes: an optical amplifying fiber; and a pump light source that supplies pump light to the optical amplifying fiber, the pump light being used for parametrically amplifying signal light input to the optical amplifying fiber by using a non-linear optical effect of the optical amplifying fiber. The fluctuation of the zero-dispersion wavelength of the optical amplifying fiber in the longitudinal direction is within the limit of 0.5 nm/100 m. 1. An optical amplifier comprising:an optical amplifying fiber; anda pump light source that supplies pump light to the optical amplifying fiber, the pump light being used for parametrically amplifying signal light input to the optical amplifying fiber by using a non-linear optical effect of the optical amplifying fiber, whereina fluctuation of a zero-dispersion wavelength of the optical amplifying fiber in a longitudinal direction is within a limit of 0.5 nm/100 m.2. The optical amplifier according to claim 1 , wherein the optical amplifying fiber has a center core part;', 'an outer core layer which is formed in a surrounding of the center core part and of which a refractive index is lower than that of the center core part; and', 'at least one buffer core layer which is formed between the center core part and the outer core layer and of which a refractive index is lower than that of the center core part and is higher than that of the outer core layer, and, 'a core portion includinga cladding portion which is formed in a surrounding of the outer core layer and of which a refractive index is lower than that of the center core part and is higher than that of the outer core layer, andan effective core area at a wavelength of 1550 nm is 18 μm2 or smaller.3. The optical amplifier according to claim 2 , wherein the optical amplifying fiber is configured so that:the effective core area at the wavelength 1550 nm is in a range from 10.27 μm2 to 18 μm2 inclusive,a relative refractive-index difference of the center ...

DEVICE AND METHOD FOR TUNING A RING RESONATOR USING SELF-HEATING STABILIZATION

A device and method for tuning a ring resonator using self-heating stabilization is provided. A light source is controlled to produce an optical signal, input to an optical ring resonator, at a power where self-heating shifts a resonance wavelength of the optical ring resonator by at least 10 picometers, the self-heating comprising absorption in the optical ring resonator of optical power from a received optical signal. Prior to using the optical ring resonator at least one of modulate and filter the optical signal at the optical ring resonator, a heater of the optical ring resonator is controlled to an operating temperature at which the resonance wavelength of the optical ring resonator is greater than a respective wavelength of the optical signal. 1. A device comprising:a light source configured to produce an optical signal;an optical waveguide configured to receive and convey the optical signal from the light source;an optical ring resonator configured to least one of: modulate and filter the optical signal on the optical waveguide;a heater positioned to heat the optical ring resonator; control the light source to produce the optical signal at a power that shifts a resonance wavelength of the optical ring resonator by at least 10 picometers, due to self-heating; and', 'prior to at least one of modulating and filtering the optical signal at the optical ring resonator, control the heater to an operating temperature, from either a high-to-low temperature adjustment direction or a low-to-high temperature adjustment direction, at which the resonance wavelength of the optical ring resonator is greater than a respective wavelength of the optical signal, wherein at a given level of self-heating a peak in an extinction ratio of the optical ring resonator as a function of heater temperature is outside of a hysteresis region., 'a controller configured to2. The device of claim 1 , wherein claim 1 , at the operating temperature claim 1 , the respective wavelength of the ...

WAVELENGTH TUNABLE OPTICAL TRANSMITTER

An optical transmitter includes: a wavelength tunable light source; an etalon filter that filters output light of the light source; a measurement unit that generates a monitor value corresponding to power of output light of the etalon filter; and a controller that controls a temperature of the light source and a temperature of the etalon filter. Until the wavelength of the output light of the light source is adjusted to a target wavelength, the controller alternately performs first processing to control the temperature of the light source based on the monitor value so as to shift the wavelength of the output light of the light source by a specified amount, and second processing to control the temperature of the etalon filter based on the monitor value so as to shift the transmission characteristics of the etalon filter by the specified amount. 1. An optical transmitter comprising:a wavelength tunable light source;an etalon filter that filters output light of the wavelength tunable light source;a measurement unit that generates a monitor value corresponding to power of output light of the etalon filter; anda controller that controls a temperature of the wavelength tunable light source to adjust a wavelength of the output light of the wavelength tunable light source, and controls a temperature of the etalon filter to adjust transmission characteristics of the etalon filter, whereinthe controller controls the temperature of the wavelength tunable light source to adjust the wavelength of the output light of the wavelength tunable light source to a specified wavelength, andduring the wavelength of the output light of the wavelength tunable light source is adjusted from the specified wavelength to a target wavelength, the controller alternately performs first processing to control the temperature of the wavelength tunable light source based on the monitor value so as to shift the wavelength of the output light of the wavelength tunable light source by a specified amount, ...

Raman fiber laser

Improved Raman Fiber Laser (RFL) generators may include a mid-infrared fiber, e.g., a fiber comprising a tellurite glass, a chalcogenide glass, a fluoride glass, or similar material. A phase-shifted fiber Bragg grating may be inscribed in the fiber. A pump laser generator may be coupled with the fiber in order to supply a pump laser to the fiber. When stimulated by the pump laser, the RFL generator may emit an output laser having a mid-infrared wavelength. A tuner may be used to tune the output laser.

APPARATUS AND METHOD FOR MEASURING CONCENTRATION OF POLLUTANTS IN WATER

The present disclosure provides an apparatus and a method for measuring a concentration of pollutants in water. A passive Q-switched fiber laser outputs an evanescent wave to a to-be-tested water sample after emitting a Q-switched pulse laser signal and transmitting it via an evanescent field fiber, and based on an evanescent wave change caused by an absorption effect of the pollutants in the to-be-tested water sample to the evanescent wave and an output repetition frequency change of the passive Q-switched fiber laser due to the evanescent wave change, outputs an output repetition frequency result of the passive Q-switched fiber laser. The method is simple; and the apparatus based on the method is simple in structure and low in cost. 1. An apparatus for measuring a concentration of pollutants in water , comprising a passive Q-switched fiber laser , an evanescent field fiber and a spectrum apparatus;wherein the evanescent field fiber is disposed in a laser resonant cavity of the passive Q-switched fiber laser, and the passive Q-switched fiber laser is connected with the spectrum apparatus;the passive Q-switched fiber laser is configured to output an evanescent wave to a to-be-tested water sample after emitting a Q-switched pulse laser signal and transmitting the Q-switched pulse laser signal via an evanescent field fiber;the passive Q-switched fiber laser is further configured to output an output repetition frequency result of the passive Q-switched fiber laser based on an evanescent wave change caused by an absorption effect of the pollutants in the to-be-tested water sample to the evanescent wave and an output repetition frequency change of the passive Q-switched fiber laser due to the evanescent wave change; andthe spectrum apparatus is configured to display the output repetition frequency result of the passive Q-switched fiber laser.2. The apparatus according to claim 1 , wherein the spectrum apparatus is further configured to determine the concentration of the ...

DEVICE AND METHOD FOR TUNING A RING RESONATOR USING SELF-HEATING STABILIZATION

A device and method for tuning a ring resonator using self-heating stabilization is provided. A light source is controlled to produce an optical signal, input to an optical ring resonator, at a power where self-heating shifts a resonance wavelength of the optical ring resonator by at least 10 picometers, the self-heating comprising absorption in the optical ring resonator of optical power from a received optical signal. Prior to using the optical ring resonator at least one of modulate and filter the optical signal at the optical ring resonator, a heater of the optical ring resonator is controlled to an operating temperature at which the resonance wavelength of the optical ring resonator is greater than a respective wavelength of the optical signal. 1. A device comprising:a light source configured to produce an optical signal;an optical waveguide configured to receive and convey the optical signal from the light source;an optical ring resonator coupled to the optical waveguide, the optical ring resonator configured to: receive the optical signal from the optical waveguide;and, at least one of modulate and filter the optical signal on the optical waveguide;a heater positioned to heat the optical ring resonator;a voltage control device positioned to change a voltage across the optical ring resonator; and, control the light source to produce the optical signal at a power where self-heating shifts a resonance wavelength of the optical ring resonator by at least 10 picometers, the self-heating comprising absorption in the optical ring resonator of optical power from a received optical signal; and,', 'prior to at least one of modulating and filtering the optical signal at the optical ring resonator, control the heater to an operating temperature at which the resonance wavelength of the optical ring resonator is greater than a respective wavelength of the optical signal., 'a controller in communication with the light source, the heater and the voltage control device, the ...

LASER BURST LOGGING SYSTEMS AND METHODS

A burst logging system logs and transmits to a local or remote computing system event data related to errors in and or potential failures of laser system components. The system further provides for capturing data at different rates from different sensors, synchronization of data capture associated with system events and the possibility for aggregation of data from multiple systems, which can in turn be leveraged to predict and or remediate future system events. 1. A laser control system , comprising:at least one processor; anda computer readable storage device coupled to the at least one processor, the computer readable storage device containing a library of non-conforming laser system data profiles based on performance parameter data of one or more laser systems, wherein the at least one processor is operable to compare one or more of the non-conforming data profiles to one or more data sets associated with an active laser system to determine a similarity with at least one of the non-conforming data profiles and communicate a status parameter for the active laser system based on the comparison.2. The laser control system of claim 1 , wherein the at least one processor is coupled to the computer readable storage device by a wide area network (WAN).3. The laser control system of claim 1 , wherein the at least one processor is coupled to the active laser system by a wide area network (WAN).4. The laser control system of claim 1 , wherein the status parameter is an updated status parameter.5. The laser control system of claim 1 , wherein the at least one processor is operable to update the library of non-conforming data profiles based on one or more failure-based event data sets associated with a failure event of the active laser system.6. The laser control system of claim 1 , wherein the one or more data sets associated with the active laser system include at least one of:a first data set associated with an optical pump source of the active laser system,a second data ...

Optically pumped semiconductor laser with mode tracking

An intra-cavity doubled OPS-laser has a laser-resonator including a birefringent filter (BRF) for coarse wavelength-selection, and an optically nonlinear (ONL) crystal arranged for type-II frequency-doubling and fine wavelength-selection. Laser-radiation circulates in the laser-resonator at one of a range of fundamental wavelengths dependent on the resonator length. The ONL crystal has a transmission peak-wavelength dependent on the crystal temperature. Reflection of circulating radiation from the BRF is monitored. The reflection is at a minimum when the ONL crystal transmission-peak wavelength is at the circulating radiation wavelength. The temperature of the ONL crystal is selectively varied to maintain the monitored reflection at about a minimum.

ROTATION-SENSITIVE SEMICONDUCTOR RING LASER DEVICE USING THE NONLINEAR SAGNAC EFFECT

Method and apparatus embody a rotation sensor including one or more ring lasers designed to utilize a nonlinear Sagnac effect, a passive waveguide arrangement, and a photodetector arrangement to receive the outcoupled light and to detect rotation of the sensor; wherein these components are arranged into a monolithically integrated optoelectronic integrated circuit on a single substrate. The method and apparatus can include seeding a stable, rotation-insensitive, strong (driving) wave using a single-frequency edge emitting laser monolithically integrated on the same substrate. 1. A rotation sensor comprising:a ring laser designed to utilize a nonlinear Sagnac effect;a passive waveguide arranged to couple the light out from the ring laser;a photodetector arranged to receive the light generated by the ring laser and to detect rotation of the sensor;wherein the ring laser, the passive waveguide, and the photodetector are arranged into a monolithically integrated optoelectronic integrated circuit on a single substrate.2. A rotation sensor , comprising:a first unidirectional ring laser arranged in a first ring arrangement designed to utilize a nonlinear Sagnac effect;a second unidirectional ring laser arranged in a second ring arrangement designed to utilize a nonlinear Sagnac effect;a three-port passive waveguide combiner arranged to combine the output light from the first and second unidirectional ring lasers into a single waveguide;a first passive waveguide arranged to couple the light from the first ring arrangement to the three-port waveguide combiner;a second passive waveguide arranged to couple the light from the second ring arrangement to the three-port waveguide combiner;a third passive waveguide arranged to further guide the light generated by the first and second lasers by collecting it at the three-port waveguide combiner and mixing it together;a photodetector arranged to receive the light generated by the first and the second ring arrangements and to detect ...

Tunable Narrow-Linewidth Single-Frequency Linear-Polarization Laser Device

A tunable narrow-linewidth single-frequency linear-polarization laser device comprising a heat sink, a pumping source packaged on the heat sink, a first and second collimating lenses, a laser back cavity mirror, a thermal optical tunable filter, a rare-earth-ion heavily-doped multicomponent glass optical fiber, a super-structure polarization-maintaining fiber grating, a polarization-maintaining optical isolator, a polarization-maintaining optical fiber, and a thermoelectric refrigerating machine. The laser device uses a short and straight single-frequency resonant cavity structure, the heavily-doped and high-gain characteristics of the multicomponent glass optical fiber, a frequency selection role and wavelength tuning function of the thermal optical tunable filter and the superstructure polarization-maintaining fiber grating, and combines a precision temperature adjustment technology, and by means of real-time adjustment of distribution of reflection wavelengths and transmission wavelengths, the laser device changes spectrum peak overlapping positions, so as to implement stable output of wide-tuning-range, extra-narrow-linewidth, high-extinction-ratio and high-output-power continuously tunable single-frequency linear-polarization laser. 1. A tunable narrow-linewidth single-frequency linear-polarization laser device , characterized in that , comprising: a heat sink , a pumping source packaged on the heat sink , a first collimating lens , a laser back cavity mirror , a thermal optical tunable filter , a second collimating lens , a rare-earth-ion heavily-doped multicomponent glass optical fiber , a super-structure polarization-maintaining fiber grating , a polarization-maintaining optical isolator , a polarization-maintaining optical fiber , and a thermoelectric cooler TEC; wherein the pumping source , the first collimating lens , the laser back cavity mirror , the thermal optical tunable fiber , the second collimating lens , the rare-earth-ion heavily-doped ...

SYSTEM AND METHOD FOR INCREASING POWER EMITTED FROM A FIBER LASER

A fiber laser having a thermal controller operatively connected to one or more fiber Bragg gratings is provided. The thermal controller does not impart much or imparts very little mechanical stress or strain to the optical fiber in which the FBGs reside because such forces can alter the FBG performance. Rather, the thermal controller utilizes a thermally conductive semi-solid or non-Newtonian fluid to submerge/suspend a portion of the optical fiber in which FBG resides. Temperature control logic controls whether a thermoelectric heater and cooler should be directed to increase or decrease its temperature. The thermoelectric heater and cooler imparts or removes thermal energy from the FBG to efficiently control its performance without the application of mechanical stress. The fiber laser having a thermal controller generally is able to increase laser output power greater than two times the amount of output power of a similarly fabricated fiber laser free of the thermal controller(s). 1. A fiber laser comprising:a Fiber Bragg Grating (FBG);a first thermal controller operatively connected to the FBG; andtemperature control logic operatively connected to the first thermal controller adapted to raise or lower the FBG temperature through the first thermal controller.2. The fiber laser of claim 1 , further comprising:an optical fiber defining a fiber core and the FBG disposed within the fiber core; andwherein the first thermal controller includes a thermally conductive semi-solid material surrounding a portion the optical fiber where the FBG is disposed.3. The fiber laser of claim 2 , wherein the first thermal controller further includes:a thermally conductive housing defining a channel, and the optical fiber surrounded by the semi-solid material is disposed within the channel; anda thermoelectric cooler (TEC) and heater adjoining the thermally conductive housing configured to selectively heat and cool the housing to affect thermal energy coupled to the FBG.4. The fiber ...

LASER PROJECTION MODULE, DEPTH CAMERA AND ELECTRONIC DEVICE

A laser projection module, a depth camera and an electronic device are provided. The laser projection module includes a laser emitter, a collimation element, a diffractive optical element and a temperature detection element. The laser emitter is configured to emit laser. The collimation element is arranged in a laser emission direction of the laser emitter and configured to collimate the laser. The diffractive optical element is arranged in a position subsequent to the collimation element along the laser emission direction of the laser emitter, and configured to diffract the laser collimated by the collimation element to form a laser pattern. The temperature detection element is arranged adjacent to the laser emitter and configured to detect a temperature of the laser emitter. 1. A laser projection module , comprising:a laser emitter configured to emit laser;a collimation element arranged in a laser emission direction of the laser emitter and configured to collimate the laser;a diffractive optical element arranged in a position subsequent to the collimation element along the laser emission direction of the laser emitter, and configured to diffract the laser collimated by the collimation element to form a laser pattern; anda temperature detection element arranged adjacent to the laser emitter and configured to detect a temperature of the laser emitter.2. The laser projection module according to claim 1 , wherein the laser projection module further comprises a substrate assembly claim 1 , the substrate assembly comprises a substrate and a circuit board carried on the substrate claim 1 , and the laser emitter is carried on the substrate assembly.3. The laser projection module according to claim 2 , wherein the circuit board is provided with a via hole claim 2 , both the laser emitter and the temperature detection element are carried on the substrate and received in the via hole.4. The laser projection module according to claim 3 , wherein the temperature detection ...

Laser oscillation device

Disclosed is a laser oscillation device. The laser oscillation device comprises: a first substrate; a second substrate which is provided above the first substrate and forms a wedge cell between the second substrate and the first substrate; a liquid crystal layer, formed by a liquid crystal having the same pitch, which is injected into the wedge cell; and a temperature controller system which is connected to both sides of the wedge cell and controls the temperatures of both sides of the wedge cell to be different from each other.

HIGH POWER SHORT PULSE FIBER LASER

A pulsed laser comprises an oscillator and amplifier. An attenuator and/or pre-compressor may be disposed between the oscillator and amplifier to improve performance and possibly the quality of pulses output from the laser. Such pre-compression may be implemented with spectral filters and/or dispersive elements between the oscillator and amplifier. The pulsed laser may have a modular design comprising modular devices that may have Telcordia-graded quality and reliability. Fiber pigtails extending from the device modules can be spliced together to form laser system. In one embodiment, a laser system operating at approximately 1050 nm comprises an oscillator having a spectral bandwidth of approximately 19 nm. This oscillator signal can be manipulated to generate a pulse having a width below approximately 90 fs. A modelocked linear fiber laser cavity with enhanced pulse-width control includes concatenated sections of both polarization-maintaining and non-polarization-maintaining fibers. Apodized fiber Bragg gratings and integrated fiber polarizers are included in the cavity to assist in linearly polarizing the output of the cavity. Very short pulses with a large optical bandwidth are obtained by matching the dispersion value of the fiber Bragg grating to the inverse of the dispersion of the intra-cavity fiber. 1. (canceled)2. A pulsed fiber laser comprising:a modelocked fiber oscillator comprising a gain fiber and a pair of reflective optical elements disposed with respect to said gain fiber to form a resonant cavity, said modelocked fiber oscillator comprising a semiconductor saturable absorber (SAM) optically connected and in close contact with an end of said gain fiber and operably arranged to induce modelocking, said modelocked fiber oscillator producing a train of optical pulses having an average pulse width;a fiber amplifier optically connected to said modelocked fiber oscillator such that said optical pulses can propagate through said amplifier, said fiber ...

LASING OUTPUT BASED ON VARYING MODAL INDEX

An example device in accordance with an aspect of the present disclosure includes a ring waveguide and bus waveguide. The ring waveguide has a first coupled portion associated with a first modal index, and the bus waveguide includes a second coupled portion associated with a second modal index. The second coupled portion is evanescently coupleable to the first coupled portion. A laser outcoupling and associated lasing output of the device is variable based on varying a difference between the first modal index and the second modal index to vary coupling between the first coupled portion and the second coupled portion, without varying modal indices of non-coupled portions of the ring waveguide and bus waveguide. 1. A device comprising:a ring waveguide having a first coupled portion associated with a first modal index; anda bus waveguide having a second coupled portion, associated with a second modal index, wherein the second coupled portion is evanescently coupleable to the first coupled portion;wherein a laser outcoupling and associated lasing output of the device is variable based on varying a difference between the first modal index and the second modal index to vary coupling between the first coupled portion and the second coupled portion, without varying modal indices of non-coupled portions of the ring waveguide and bus waveguide.2. The device of claim 1 , wherein the ring waveguide is to serve as a laser cavity based on resonance of the ring waveguide.3. The device of claim 1 , further comprising an output waveguide coupled to the ring waveguide based on a third coupled portion of the ring waveguide; wherein the bus waveguide is to serve as a laser cavity based on resonance of the bus waveguide; wherein the ring waveguide is passive and is to couple lasing output from the bus waveguide to the output waveguide.4. The device of claim 1 , wherein the bus waveguide is a conformal waveguide that is curved corresponding to coupling with the ring waveguide.5. The ...

Tunable, Narrow Linewidth Single Transversal Mode Light Source Using a Quasi-Incoherent Broadband Pump Source

A light source is disclosed, having a quasi-incoherent broadband pump source configured to produce a longitudinally and transversally multi-mode pump beam. The light source may include a means for narrowing the linewidth of the pump beam. The light source includes an optical parametric oscillator with an optical cavity containing a crystal. The optical parametric oscillator is configured to receive light from the pump source and produce a first output light beam and a second output light beam. An optical coupler is disposed between the pump source and the optical parametric oscillator. At least one of the first and second output light beams is a substantially single transversal mode light having a narrower linewidth than the pump source. 1. A light source , comprising:a quasi-incoherent broadband pump source configured to produce a longitudinally and transversally multi-mode pump beam;an Optical Parametric Oscillator (OPO) comprising an optical cavity containing a crystal configured to receive light from the pump source and produce a first output light beam and a second output light beam; andan optical coupler between the pump source and the OPO,wherein at least one of the first and second output light beam comprises substantially single transversal mode light having a narrower linewidth than the pump source.2. The light source of claim 1 , further comprising means for narrowing a linewidth of the broadband pump beam disposed between the pump source and the optical coupler.3. The light source of claim 1 , further comprising means for narrowing a linewidth of the broadband pump beam integrated within the quasi-incoherent broadband pump source.4. The light source of claim 2 , wherein the means for narrowing the linewidth of the broadband pump source comprises a volume Bragg grating.5. The light source of claim 1 , wherein the optical coupler comprises an optical fiber.6. The light source of claim 1 , wherein the quasi-incoherent broadband pump source comprises a ...

Narrow-linewidth microcavity brillouin laser with suppressed temperature fluctuations

Ultrastable lasers serve as the backbone for advanced scientific experiments and enable atomic spectroscopy and laser interferometry at high levels of precision. But is not clear how to realize an ultrastable laser that is compact and portable for field use. An ultrastable laser source should be insensitive to both short- and long-term fluctuations in temperature, which ultimately broaden the laser linewidth and cause drift in the laser's center frequency. Fortunately, using a large mode-volume optical resonator, which suppresses the resonator's fast thermal fluctuations, together with the stimulated Brillouin scattering (SBS) optical nonlinearity presents a powerful combination that enables the ability to lase with an ultra-narrow linewidth of 20 Hz. The laser's long-term temperature drift is compensated by using the narrow Brillouin line to sense minute changes in the resonator's temperature (e.g., changes of 85 nK). The precision of this temperature measurement enables the stabilization of resonators against environmental perturbations.

RING AMPLIFIER FOR EXTENDED RANGE STEERABLE LASER TRANSMITTER AND ACTIVE SENSOR

A ring amplifier amplifies one or more spot-beams that scan a circular pattern in a two-dimensional FOV to extend the range of range steerable laser transmitter or an active situational sensor. Mechanical, solid-state or optical phase array techniques may be used to scan the spot-beam(s) in the circular pattern. Mirrors are preferably positioned to redirect the spot-beams to enter and exit the ring amplifier through sidewalls to amplify the spot-beam and return it along a path to scan the circular pattern. For efficiency, the pumps and thermal control may be synchronized to the circular scan pattern to only pump and cool the section of gain medium in which the spot-beam is currently scanned and the next section of gain medium in the circular scan pattern. 1. A laser device , comprising:one or more lasers configured to generate one or more collimated spot-beams;one or more beam steerers responsive to command signals to steer the one or more collimated spot-beams to scan a circular pattern in a two-dimensional field-of-view (FOV); anda ring amplifier comprising one or more pumps configured to pump a gain medium in the form of a ring, said ring amplifier configured such that said one or more collimated spot-beams pass through the gain medium one or more times to amplify the one or more collimated spot beams while preserving the steering of the one or more collimated spot-beams over the FOV.2. The laser device of claim 1 , wherein said one or more lasers and said one or more beam steerers comprise:a laser configured to generate a collimated spot-beam along an optical axis;a liquid crystal waveguide (LCWG) along the optical axis responsive to command signals to steer the collimated spot-beam in two-dimensions about the optical axis; anda fixed mirror having a conic section oriented along the optical axis that redirects the collimated spot-beam away from the optical axis to scan the circular pattern in the two-dimensional FOV.3. The laser device of claim 1 , wherein said ...

METHOD FOR DRILLING A PIECE BY LASER PULSES

Device for suppressing laser intensity noise by using frequency doubling cavity and measuring method thereof

本发明公开了一种利用倍频腔抑制激光强度噪声的装置及其测量方法，1550nm单频激光器发出的基频光经电光调制器、透镜、法拉第隔离器、双色镜后入射到倍频腔，倍频腔的反射信号被锁相回路探测，双色镜是对基频光高透、倍频光高反的镜片，倍频腔经参量上转换过程产生的波长为775nm的倍频光经双色镜反射后，入射至功率计进行探测功率，第一探测器设置在倍频腔的另一端，用于接收并探测倍频腔透射峰信号，经倍频腔产生的倍频光的功率被功率计探测，倍频腔产生的返回基频信号经法拉第隔离器的分束棱镜、功率波片后，被第二探测器接收并探测，第二探测器产生的探测信号由频谱仪接收并探测。本发明调节精确、方便、直观等优点，可以广泛应用于倍频腔应用领域。

Laser projection module, depth camera and electronic device

本发明公开了一种激光投射模组。激光投射模组包括激光发射器、准直元件、衍射光学元件和温度检测元件。激光发射器用于发射激光。准直元件用于准直激光。衍射光学元件用于衍射经准直元件准直后的激光以形成激光图案。温度检测元件用于检测激光发射器的温度并输出温度检测信号。本发明还公开了一种深度相机和电子装置。本发明实施方式的激光投射模组、深度相机和电子装置通过在激光发射器的附近设置一个温度检测元件，温度检测元件可以检测激光发射器的温度，如此，在激光发射器的温度过高时，减小激光发射器的功率，从而避免激光发射器的温度过高导致温漂过大而影响激光发射器的使用性能的问题。

Method and device for holes making in part using laser pulses

FIELD: physics. SUBSTANCE: defining multiple values of working parameters of the laser generator to run a predetermined diameter of holes in the detail. Defining resonator laser temperature set value depending on the characteristics of the generator running holes and/or material details which perform holes, and regulate the temperature of the resonator on this specified value during the holes making time. The device comprises a laser generator comprising a resonator, in which a solid rod for generating laser pulses is mounted, a cooling system of the resonator by circulating the cooling fluid adjacent to or inside the resonator and a means for controlling the laser operating parameters. The device contains means of automatic temperature control at the specified value generator resonator depending on the characteristics of running holes by changing flow and/or temperature of cooling fluid medium. EFFECT: geometry of the holes is improved. 10 cl, 6 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 628 503 C2 (51) МПК B23K 26/38 (2014.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2014153930, 30.05.2013 (24) Дата начала отсчета срока действия патента: 30.05.2013 (72) Автор(ы): ЛЕ МЕР Ив (FR), МОТТЕН Жан-Батист (FR) (73) Патентообладатель(и): СНЕКМА (FR) Дата регистрации: (56) Список документов, цитированных в отчете о поиске: DE 10063309 A1, 11.07.2002. US Приоритет(ы): (30) Конвенционный приоритет: 01.06.2012 FR 1255128 (45) Опубликовано: 17.08.2017 Бюл. № 23 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 12.01.2015 (86) Заявка PCT: FR 2013/051214 (30.05.2013) (87) Публикация заявки PCT: 2 6 2 8 5 0 3 (43) Дата публикации заявки: 27.07.2016 Бюл. № 21 3806829 A1, 23.04.1974. EP 817338 A2, 07.01.1998. SU 1299025 A1, 27.11.1995. RU 2425742 C2, 10.08.2011. R U 17.08.2017 2 6 2 8 5 0 3 R U Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, строение 3, ООО "Юридическая фирма Городисский и ...

Method and device for drilling a workpiece with laser pulses

A method for drilling a workpiece with laser pulses. A method for drilling a workpiece, in particular of a turbine engine, by means of a pulse laser generator comprising a cavity in which a solid bar for generating laser pulses is mounted, the method comprising a step (82) consisting of determining the values of a plurality of operating parameters of the laser generator to form holes of a predetermined diameter in the workpiece, and of taking into consideration, in these parameters, a setpoint value of the temperature of the laser cavity, defined on the basis of characteristics of the holes to be drilled.

Method and device for drilling a workpiece with laser pulses

使用激光脉冲用于钻孔工件的方法。通过包括腔室的脉冲激光发生器，用于钻孔工件，特别地涡轮发动机的工件的方法，其中腔室中安装有用于产生激光脉冲的实心棒，该方法包括步骤(82)，该步骤(82)包括确定激光发生器的多个工作参数值，以在工件中形成预定直径的孔口，并且在这些参数中考虑激光器腔室的温度设定点值，该温度设定点值是基于待要被钻孔的孔口的特征而确定的。

METHOD FOR DRILLING A PIECE BY LASER PULSES

Procédé de perçage d'une pièce, en particulier de turbomachine, au moyen d'un générateur laser à impulsions comportant une cavité dans laquelle est monté un barreau solide de génération des impulsions laser, le procédé comprenant une étape (82) consistant à déterminer les valeurs de plusieurs paramètres de fonctionnement du générateur laser pour former des orifices d'un diamètre prédéterminé dans la pièce, et à prendre en compte dans ces paramètres une valeur de consigne de la température de la cavité laser, déterminée en fonction de caractéristiques des orifices à percer.

Method and apparatus with laser pulse drilling-workpiece

使用激光脉冲用于钻孔工件的方法。通过包括腔室的脉冲激光发生器，用于钻孔工件，特别地涡轮发动机的工件的方法，其中腔室中安装有用于产生激光脉冲的实心棒，该方法包括步骤(82)，该步骤(82)包括确定激光发生器的多个工作参数值，以在工件中形成预定直径的孔口，并且在这些参数中考虑激光器腔室的温度设定点值，该温度设定点值是基于待要被钻孔的孔口的特征而确定的。

Method and device for drilling a workpiece with laser pulses

A method of drilling a part, or a turbine engine part, by a pulse laser generator including a cavity in which there is mounted a solid bar for generating laser pulses, the method including determining values of a plurality of operating parameters of the laser generator for forming orifices of predetermined diameter in the part, and taking account, among the parameters, of a setpoint value for the temperature of the laser cavity, which value is determined as a function of characteristics of the orifices to be drilled.

Broadband topology load tunable Laguerre Gaussian optical parameter oscillator

本发明公开了一种宽带拓扑荷可调谐的拉盖尔高斯光参量振荡器，包括纳秒脉冲激光器、光束整形装置、镀膜腔镜、周期极化铌酸锂晶体、温控装置、偏振元件和矢量涡旋波片。镀膜腔镜包括镀膜前腔镜和镀膜后腔镜，二者形成谐振腔。本发明使矢量涡旋波片和镀膜前腔镜的相对位置满足凹面镜1：1成像关系，从而形成由实心光束向空心拉盖尔高斯光束平滑过渡的自再现腔模，提高了腔模和泵浦光的耦合效率，降低了腔内损耗，最终实现了高效率、高纯度、波长和拓扑荷可调谐的拉盖尔高斯光束输出。

Pulsed laser system and driving method thereof

本发明公开一种脉冲激光系统及其驱动方法。其中，该方法包括：由控制器根据从数据服务器提供的工件的加工条件信息确定将要照射到工件上的合适激光束的脉冲能量和曝光时间；由控制器确定从光束监测装置发出的光束的平均输出功率和能量是否处于设定光束的平均输出功率和能量范围内；由控制器基于确定的信息设定适于加工工件的脉冲能量和光束平均输出功率；以及计算空载时间，从而使测量的平均功率中的变化最小化，以使测量的光束平均功率遵循设定的光束平均输出功率并且将计算出的空载时间提供给触发脉冲生成器，其中，空载时间是光束未曝光在工件上时的时段。

Pulsed laser system and driving method thereof

The present invention relates to a pulse-type laser system and a method of driving the same. The method of driving the pulse-type laser system according to the present invention includes: allowing a control unit to determine pulse energy of a laser beam and exposure time to the laser beam, which are appropriate to the irradiation of the laser beam into a workpiece, based on information of machining conditions of the workpiece received from a data server; allowing the control unit to determine average output power and energy of the laser beam, which are transmitted from a beam monitoring device, to be in the set range of the average output power and energy of the laser beam; allowing the control unit to set the pulse energy and the average output power of the laser beam, which are appropriate to the machining of the workpiece, based on the determination information; and allowing the control unit to calculate loss-time, which is off-time, of the trigger pulse to provide the loss-time to a trigger pulse generator so that the variation in the measured average power is minimized so the set average output power of the laser beam approximates the measured average output power of the laser beam. As described above, according to the present invention, the pulse energy is acquired by fixing the pulse width of the trigger signal, and required average optical power is acquired by changing (adjusting) the loss-time, which is in the off-time duration of the trigger signal, thereby simultaneously stabilizing the change in the average output power and the energy change between pulses of the laser beam. [Reference numerals] (110) Laser beam transmitting unit; (120) Laser source; (130) Power supply; (140) Trigger pulse generator; (150) Controller; (160) Beam monitoring device; (170) Temperature monitoring device; (180) Data server; (190) Workpiece; (AA) RF signal; (BB) Beam power/energy information; (CC) Temperature information; (DD) Machining condition information

CALORIFIC CAPACITY LASER AND ASSOCIATED LASER MEDIUM

Le nouveau laser à capacité calorifique permet d'obtenir un faisceau de haute qualité, tout en présentant une puissance laser élevée.Pour cela, le laser à capacité calorifique (1) présentant un milieu laser solide (10), au moins une source de pompage (20,24) apte à émettre un rayonnement de pompage et une cavité optique (31, 32) caractérisé en ce qu'il comporte :. Au moins un dispositif (21,25) apte à homogénéiser le rayonnement de pompage,. un milieu laser (10) dopé comportant un corps (27) avec une première et une deuxième extrémités (18, 19) et présentant un étirement dans la longueur (I) de plus de 6 cm et sa hauteur en coupe (d) est inférieure à son étirement dans la longueur (1),. éventuellement, des premier moyens (22) de guidage d'un rayonnement de pompage en direction d'une première extrémité (18) du milieu laser (10),et en ce que, d'une part, la concentration du dopage dans le milieu laser varie axialement, cette concentration étant plus faible au niveau de ladite première extrémité et croissant jusqu'au centre du milieu laser et, d'autre part, soit la cavité comporte une optique de formation de faisceaux (40) apte à assurer l'homogénéisation du faisceau laser dans la phase laser et la concentration du dopage du milieu laser est uniforme radialement, soit la cavité ne comporte pas d' optique de formation de faisceaux (40) et apte à assurer l'homogénéisation du faisceau laser dans la phase laser et le milieu laser a une concentration en dopage qui varie radialement, la répartition radiale du dopage du milieu laser (10) étant définie de telle manière que le dopage augmente radialement du bard vers le centre du corps (27). The new heat capacity laser provides a high quality beam, while having a high laser power.For this, the heat capacity laser (1) having a solid laser medium (10), at least one pumping source (20,24) capable of emitting pumping radiation and an optical cavity (31, 32) characterized in that it comprises: ...

Laser light source based on OCT spectroscopy applications

本发明涉及一种基于OCT光谱分析应用的激光光源。所述的激光光源包括：激光模块；温度控制电路，与所述激光模块连接，用于实时检测和调节所述激光模块的温度值；MCU模块，与所述温度控制电路连接，用于根据检测的所述温度值控制所述温度控制电路调节所述激光模块的温度值以使所述激光模块的温度保持恒定；电流控制电路；与所述激光模块连接，用于实时采集和调节所述激光模块的电流值；所述MCU模块与所述电流控制电路连接，还用于根据所述采集的电流值控制所述电流控制电路调节输出至所述激光模块的电流大小以使输出至所述激光模块的电流保持恒定。通过设置温度控制电路和电流控制电路实现了激光模块的恒温恒流控制，使得该激光光源的性能稳定、可靠。

Frequency conversion solid-state laser, frequency-doubling solid-state laser device, and frequency conversion coupling resonance cavity

(57)【要約】 【課題】 単一縦モードおよび単一横モードの波長変換 レーザ光を発生させるレーザ装置を提供すること。 【解決手段】 レーザ装置３は、励起光１２を発生させ る励起光源１０と、結合光学系１４と、入射側ミラー１ ６と、共用の部分的反射ミラー１８と、出射側ミラー２ ０と、固体レーザ媒質２２と、光波長変換装置２４と、 制御回路３０および温度能動素子３２、３４、３６とを 含む温度制御装置と、温度センサ（図示せず）とを備え ている。結合型共振キャビティ４０は、第１の共振キャ ビティ４２と、第２の共振キャビティ４４とを有してい る。入射側ミラー１６と共用の部分的反射ミラー１８と が第１の共振キャビティ４２を形成し、出射側ミラー２ ０と共用の部分的反射ミラー１８とが第２の共振キャビ ティ４４を形成している。共用の部分的反射ミラー１８ を、第１の共振キャビティと第２の共振キャビティによ って共用している。

Resonator for electromagnetic waves with a stabilizing device and method for stabilizing the resonator length

Tunable laser system with multi-optical-path output

本发明涉及激光器领域，具体涉及一种多光路输出的可调谐激光器系统，包括：可调谐激光器列阵，该可调谐激光器列阵包括若干激光器条；热电制冷器，该可调谐激光器列阵设置在热电制冷器上；光学镜组，该光学镜组至少包括设置在可调谐激光器列阵前的准直透镜，以及设置在准直透镜和光纤列阵之间的会聚透镜；光纤列阵；处理器单元，该处理器单元与可调谐激光器列阵连接，用于控制激光器条同时发射激光。本发明通过设计一种多光路输出的可调谐激光器系统，在可调谐激光器列阵中设置若干激光器条，通过准直透镜和会聚透镜的设计实现不同激光器条发射光束的同时输出，并进而对各个激光器条的发射光束进行功率分束，成倍扩展输出光束。

Stimulated Brillouin scattering and stimulated Raman scattering combined compressed ultrashort pulse laser

本发明为受激布里渊散射与受激拉曼散射组合压缩超短脉冲激光器，包括：泵浦源、光隔离系统、二分之一波片、第一偏振片、脉宽可调的SBS脉宽压缩系统，所述激光器还包括第一反射镜和SRS产生放大系统，单纵模激光器作为泵浦源发出泵浦光，依次经过光隔离系统、二分之一波片、第一偏振片后进入SBS脉宽压缩系统；泵浦光在SBS脉宽压缩系统被压缩成百皮秒激光，压缩后的百皮秒激光被第一偏振片和第一反射镜反射后进入SRS产生放大系统中进行进一步的压缩放大。通过SBS脉宽压缩技术与SRS脉宽压缩技术组合压缩的技术方案，克服了SBS脉宽压缩技术的压缩极限制约，达到比调Q技术更窄脉宽，比锁模技术更高能量的激光脉宽输出。

Laser induced heating device by illuminating 2-band laser lights

본 발명은 2-대역 파장 조사에 의한 국소부의 온도 조절 장치에 관한 것으로 특히, 장파장대역 전자기장과 단파장대역 전자기장이 동시에 조사하여, 상기 장파장대역 전자기장은 매체 변조에 필요한 최소 에너지 파워(Emin) 보다 작도록 변조될 부분을 포함하는 매체의 소정 영역에 조사되고, 상기 단파장대역 전자기장은 그 에너지가 매체 변조에 충분한 에너지 파워(Eenough)와 변조에 필요한 최소 에너지 파워(Emin)의 차보다 크도록 상기 장파장대역 전자기장의 에너지가 조사되는 소정 영역의 국소부에만 조사되며, 상기 국소부에 조사되는 장파장대역 전자기장의 에너지와 단파장대역 전자기장의 에너지의 합이 매체 변조에 충분한 에너지 파워(Eenough) 보다 크게 함으로써 매체에 정보를 기록하는 방법과 그에 따른 장치를 제공하면, 종래 하나의 파장만을 이용하는 가열 방법에서 단파장대역 광원의 출력이 낮아 변조가 불가능한 경우와 대비하여, 장파장대역 전자기장 및 단파장대역 전자기장이 합해진 전자기장을 이용하므로 단파장대역 전자기장의 출력이 낮더라도 작은 변조 영역을 얻을 수 있는 효과가 있다. The present invention relates to a temperature control device of a local part by two-band wavelength irradiation. In particular, the long-wavelength electromagnetic field and the short-wavelength electromagnetic field are irradiated simultaneously so that the long-wavelength electromagnetic field is smaller than the minimum energy power (Emin) required for media modulation. The short wavelength band electromagnetic field is irradiated to a predetermined region of the medium including the portion to be modulated, and the short wavelength band electromagnetic field is such that its energy is larger than the difference between the energy power Enough sufficient for the medium modulation and the minimum energy power Emin required for modulation. The energy is irradiated only to a local part of a predetermined region irradiated with energy, and the sum of the energy of the long-wavelength electromagnetic field and the energy of the short-wavelength electromagnetic field irradiated to the local part is made larger than the energy power (Enenough) sufficient for medium modulation so that information is transmitted to the medium. By providing a method of recording and a device accordingly, conventionally only one wavelength In contrast to the case where the modulation method is impossible because the output of the short wavelength light source is low in the heating method used, a small modulation region can be obtained even if ...

Side-pumped solid state laser source, and pumping process for a solid-state laser source

The side-pumped solid-state laser source comprises a resonant cavity defined by at least two spaced-apart mirrors, an active medium of laser crystal type placed in said resonant cavity, and a pumping source, the layout of the resonant cavity, defined by the crystal and by the mirrors, being arranged to cause spatial inversion of the oscillating mode within the active medium in the absorption direction of the pumping beam, such as to symmetrize the thermal focal length seen by the oscillating mode. The laser source comprises lenses for conditioning the pumping beam emitted by the pumping source , to form on the side face of the laser crystal a pumping spot arranged to symmetrize the spatial quality of the emitted laser beam and/or active control means for the laser crystal temperature, in order to correct its undesired astigmatic effects. The pumping process for the solid-state laser source generates on the side face of the laser crystal a pumping spot arranged to symmetrize the spatial quality of the emitted laser beam, in such a manner as to correct its undesired astigmatism effects.

Traveling-wave lasers with a linear cavity

A linear cavity design to produce a traveling wave operation as in a ring laser without the ring cavity design. All fiber configurations may be used to implement fiber lasers based on the linear cavity design.

Spherical liquid-crystal laser

FIELD: physics, optics. SUBSTANCE: solution relates to a laser radiation source, the resonator of which is a droplet of chiral liquid crystals. The source has the shape of a spherical droplet. The droplet contains a dispersed active medium. The droplet consists of chiral liquid crystals, having a property of selective reflection in the emission range of the active medium. EFFECT: enabling use of a droplet of cholesteric liquid crystals as a Bragg-type optical 3D microresonator. 20 cl, 13 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 559 124 C2 (51) МПК H01S 3/06 (2006.01) H01S 3/213 (2006.01) G02F 1/13 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2013126429/28, 08.11.2011 (24) Дата начала отсчета срока действия патента: 08.11.2011 (72) Автор(ы): МУШЕВИЧ, Игор (SI), ХУМАР, Матьяз (SI) (73) Патентообладатель(и): ИНСТИТУТЕ ЙОЗЕФ СТЕФАН (SI) Приоритет(ы): (30) Конвенционный приоритет: (43) Дата публикации заявки: 20.12.2014 Бюл. № 35 R U 10.11.2010 SI P-201000377 (45) Опубликовано: 10.08.2015 Бюл. № 22 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 10.06.2013 (86) Заявка PCT: 2 5 5 9 1 2 4 (56) Список документов, цитированных в отчете о поиске: EP 270346 A1 08.06.1988 . JP 2005116980 A 28.04.2005 . US 3771065 A1 06.11.1973 . JP 2005244106 A 08.09.2005 2 5 5 9 1 2 4 R U (87) Публикация заявки PCT: WO 2012/062450 (18.05.2012) Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, строение 3, ООО "Юридическая фирма Городисский и Партнеры" (54) СФЕРИЧЕСКИЙ ЖИДКОКРИСТАЛЛИЧЕСКИЙ ЛАЗЕР (57) Реферат: Решение относится к источнику лазерного обладают свойством селективного отражения в излучения, в качестве резонатора которого диапазоне испускания активной среды. используется капля из хиральных жидких Технический результат заключается в обеспечении кристаллов. Источник имеет форму сферической возможности использования капель капли. Причём в капле существует холестерических жидких кристаллов в ...

MODULATED TRANSMISSION FREQUENCY MICROLASER

Side-pumped solid state laser source, and pumping process for a solid-state laser source

The side-pumped solid-state laser source comprises a resonant cavity defined by at least two spaced-apart mirrors, an active medium of laser crystal type placed in said resonant cavity, and a pumping source, the layout of the resonant cavity, defined by the crystal and by the mirrors, being arranged to cause spatial inversion of the oscillating mode within the active medium in the absorption direction of the pumping beam, such as to symmetrize the thermal focal length seen by the oscillating mode. The laser source comprises lenses for conditioning the pumping beam emitted by the pumping source , to form on the side face of the laser crystal a pumping spot arranged to symmetrize the spatial quality of the emitted laser beam and/or active control means for the laser crystal temperature, in order to correct its undesired astigmatic effects. The pumping process for the solid-state laser source generates on the side face of the laser crystal a pumping spot arranged to symmetrize the spatial quality of the emitted laser beam, in such a manner as to correct its undesired astigmatism effects.

Laser unit having preparatory function for activating the unit and activation method for the unit

A laser unit having a preparatory function for activating the unit and an activation method for the unit, capable of stabilizing the temperature of each component of the laser unit in the preparation stage when the laser unit is activated in a low-temperature or high-temperature environment, and then effectively judging completion of the preparation. During a period of time Ta from T1 to T2, a first trial of laser oscillation is performed. After a period of time Tb in which the laser is not oscillated, a second trial of laser oscillation from T3 to T4. Such an operation is repeated until a predetermined criterion is satisfied. Laser output values P2, P4, P6, .., at the last moment in each trial of laser oscillation are recorded. Then, each difference between the laser outputs at the last moments of two neighboring or continuous trials, is calculated. When the difference is lower than a predetermined criterion value, the preparation of the laser unit is judged to be completed.

Laser equipment

Monomode optical fibre designed to compensate for a refractive index variation related to thermal effects and laser using such an optical fibre as a gain medium

The subject matter of the invention is a monomode optical fibre (20) that comprises a monomode core (22) and at least one cladding encircling said core and that is characterized in that the monomode core (22) comprises at least two zones, a first zone with at least one first refractive index and a second zone with at least one second refractive index that is different from the first refractive index, the difference between the first refractive index and the second refractive index being of the same order of magnitude as the variation in the refractive index of the second zone between the inactive state and the active state of the fibre. Another subject of the invention is a process for manufacturing such a monomode optical fibre.

Solid state laser - has birefringent crystal in resonator producing two temperature-sensitive polarised frequency components at right angles

Laser system providing power ramp-up and method of operating same

In a laser system which produces radiation which is highly absorbed by water, the pump voltage supplied to the laser rod is slowly increased between the lasing threshold voltage and the full operational voltage of the pump. As a result, the output energy and circulating energy of the system slowly increase, such that any water on the intracavity coatings is vaporized slowly, rather than explosively. The laser system and method of using same thus reduce or prevent damage to the intracavity coatings used within the laser cavity.

Traveling-wave lasers with a linear cavity

Radiation resistant fiber optical assembly

An optical amplifier is provided in which radiation levels experienced by an optical fiber are minimized. A sealed enclosure houses an optical fiber. An input optical signal enters on end of the fiber and an amplified output optical signal exits the other end of the optical fiber. Small particles embedded with a gas fill the interior of the enclosure. An optical pump supplies an amplification laser beam coupled to one of the ends of the optical fiber. Due to energy supplied by the amplification laser beam, the input optical signal is amplified upon exiting the optical fiber. At least a portion of the gas embedded in the small particles is released inside the enclosure when the small particles are subjected to heat to provide a gaseous interior in the enclosure that minimizes radiation levels experienced by the optical fiber due to external radiation.

Tunable optical parametric oscillator

Laser device and operation method thereof

【課題】励起光密度が高い領域で単一モードを維持し光変換効率が向上したレーザ装置を提供する。【解決手段】レーザ装置は、第１ミラーと第２ミラーを含む進行波型の共振器と、前記第１ミラーと前記第２ミラーの間に配置されるレーザ媒質とを有し、前記第１ミラーと前記第２ミラーは、前記共振器を周回する周回光が前記レーザ媒質の内部に焦点を結ぶように配置され、前記共振器に入射される励起光が前記焦点で前記周回光に重畳されて前記周回光よりも細くしぼられ、前記励起光のレイリー長をＺＲ、前記レーザ媒質の前記励起光に対する吸収係数をαとすると、ＺＲ×α＜０．５であり、前記共振器の周回Ｇｏｕｙ位相シフトは２π×ｎ／ｍ（ｍは１５未満の整数、ｎはｍ以下の整数）を除く値を有する。【選択図】図１

Resonator for electromagnetic waves with a stabilizer and method for stabilizing the length of the resonator

A resonator (1) for electromagnetic waves with a stabilizer can, for example, be part of a mode-coupled fiber laser. The stabilizer (2) is provided to stabilize the effective length of the resonator (1). Stabilization is accomplished in a first embodiment via two temperature controllers (3, 4) controlling the temperature of a first portion (L1) and the temperature of a second portion (L2) of the resonator (1). The temperature of the second portion (L2) is controlled as a function of an error signal generated by deviations of the resonator (1) from a nominal length. The second portion (L2) is significantly shorter than the first portion (L1).

Apparatus, method, and computer program product for controlling laser wavelength stability

An apparatus includes a laser that generates a predetermined wavelength when the laser operates at room temperature, the predetermined wavelength being offset from a specific wavelength. The laser has a controlled wavelength range due to a wavelength drift, the wavelength range having a first wavelength as the upper boundary and a second wavelength as the lower boundary, the first wavelength is generated when the laser operates at a first temperature of an ambient and the second wavelength is generated when the laser operates at a predetermined temperature higher than a second temperature of the ambient. The apparatus includes a heater that heats the laser such that a wavelength in the controlled wavelength range that is generated by the laser when heated by the heater from the second temperature is longer than a short wavelength that is generated by the laser centered on the specific wavelength that operates at the second temperature; and a control circuit configured to turn on the heater.

METHOD AND DEVICE FOR EXECUTING HOUSES IN PARTS BY USING LASER PULSES

1. Способ выполнения отверстий в детали (42), в частности, турбомашины при помощи импульсного лазерного генератора (10), содержащего резонатор (12), в котором установлен твердый стержень (14) для генерирования лазерных импульсов, при этом способ содержит этап (82), на котором определяют значения нескольких рабочих параметров лазерного генератора для выполнения отверстий заранее определенного диаметра в детали, отличающийся тем, что определяют заданное значение (Т1) температуры резонатора лазерного генератора в зависимости от характеристик выполняемых отверстий и/или от материала детали, в которой выполняют отверстия, и регулируют температуру резонатора по этому заданному значению во время выполнения отверстий.2. Способ по п. 1, отличающийся тем, что рабочие параметры лазерного генератора включают в себя частоту повторения импульсов (F), число импульсов, продолжительность импульса (Тр) и/или максимальную мощность лазерного генератора в процентах (Н%).3. Способ по п. 1, отличающийся тем, что температуру резонатора регулируют до +/-3°С вокруг заданного значения (Т1).4. Способ по п. 1, отличающийся тем, что заданное значение определяют таким образом, чтобы отверстия были сквозными и имели круглое сечение.5. Способ по п. 1, отличающийся тем, что содержит этап, на котором определяют заданное значение (Т1) температуры резонатора (12), при которой лазерный генератор является настроенным и выдает максимальную энергию для заранее определенных рабочих параметров.6. Способ по п. 1, отличающийся тем, что заданное значение (Т1) температуры резонатора составляет от 25 до 40°С.7. Способ по п. 1, отличающийся тем, что температуру резонатора (12) регулируют при помощи системы (24) охлаждения резонатора за счет цирк

Temperature compensated optical device

一种温度补偿光学装置，包括可变压缩玻璃元件(10)，其中具有一个布拉格光栅、补偿材料隔离物(26)以及端盖(28)，这些部件均安装于外部壳体(30)内。元件(10)、端盖(28)以及壳体(30)均由热膨胀系数(CTE)低的材料制成，例如，硅石，石英等。隔离物(26)由较高CTE材料制成，例如，金属派热克斯玻璃，陶瓷等。隔离物(26)的材料和长度L5选择为抵消因温度引起的光栅波长变化。当温度升高时，隔离物(26)膨胀得比硅石结构快，导致压缩应变作用于元件(10)，它使光栅(12)的波长改变以平衡内在温度随变化的波长。因此，光栅(12)的波长在广泛的温度范围内基本上不改变。元件(10)包括光纤，所述光纤包含至少一个铭印其中的布拉格光栅(12)，封装及熔接到玻璃毛细管的至少一部分，或者带有光栅(12)的大直径波导(或杖)，它具有芯(11)和大包层，在承受大范围轴向压缩应变时不发生弯曲。元件可以具有“狗骨”形以增大光栅(12)上的压缩应变。装置(8)也可以放置于轴向可调整的系统中，该系统在保持无热时允许波长动态调整。除光栅外，装置可以是无热激光器，DFB激光器等。并且，整个装置(8)可以全部由整块玻璃材料构成。

Amplifying apparatus and amplifying medium

An amplifying apparatus includes an optical fiber that includes a wound portion doped with a rare earth element and three-dimensionally wound, holes being formed in cladding of the optical fiber and surrounding a core of the optical fiber, the optical fiber transmitting signal light injected thereinto; a thermally conductive member in which the wound portion of the optical fiber embedded, the thermally conductive member having thermal conductivity; a light source that emits excitation light; an injecting unit that injects the excitation light emitted by the light source, into the optical fiber; and a temperature adjusting unit that includes a thermal coupling unit thermally connected to the light source and the thermally conductive member, the temperature adjusting unit adjusting a temperature of the thermal coupling unit.

Output ramp-up laser system and operation method thereof

Grating-based optical device with axial compression thermal compensation

A temperature compensated optical device includes a compression-tuned glass element (10) having a Bragg grating (12) therein, a compensating material spacer (26) and an end cap (28) all held within an outer shell (30). The element (10), end cap (28) and shell (30) are made of a material having a low coefficient of thermal expansion (CTE), e.g., silica, quartz, etc. And the spacer (26) is made of a material having a higher CTE, e.g. metal Pyrex®, ceramic, etc. The material and length L5 of the spacer (26) is selected to offset the upward grating wavelength shift due to temperature. As temperature rises, the spacer (26) expands faster than the silica structure causing a compressive strain to be exerted on the element (10), which shifts the wavelength of the grating (12) down to balance the intrinsic temperature induces wavelength shift up. As a result, the grating (12) wavelength is substantially unchanged over a wide temperature range. The element (10) includes either an optical fiber having at least one Bragg grating (12) impressed therein encased within and fused to at least a portion of a glass capillary tube or a large diameter waveguide (or cane) with a grating (12) having a core (11) and a wide cladding, which does not buckle over a large range of compressive axial strains. The element may have a "dogbone" shape to amplify compressive strain on the grating (12). The device (8) may also be placed in an axially tunable system that allows the wavelength to be dynamically tuned while remaining athermal. In addition to a grating, the device may be an athermal laser, DFB laser, etc. Also, the entire device (8) may be all made of monolithic glass materials.

Multi-wavelength tunable ultra-narrow-band light source filtering system

本申请公开了一种多波长可调谐超窄带光源滤光系统，通过设置第一滤光片、原子滤光模组和第二滤光片进行三级滤光处理，其中，可以通过设置第一滤光片和第二滤光片的中心波长可以实现对输出光的波长进行粗调，再通过改变碱金属原子蒸气池内的磁场强度和工作温度可以实现对输出光的波长进行细调，进而可以快速得到所需波长的目标光源，其波长调谐灵活性较高且便于操作。同时，碱金属原子蒸气池以原子跃迁谱线的波长为基准，可在紫外、可见和近红外光谱范围内许多波长下工作，具有多波长特性，可以实现多波长调谐，另外，所输出的光的滤光带宽非常窄，可达到1pm水平。

266nm solid laser and beam quality optimization method thereof

本发明提供了一种266nm固体激光器及其光束质量优化方法，其中266nm固体激光器包括第一倍频结构和第二倍频结构；第二倍频结构沿266nm固体激光器的激光出射光路设置于第一倍频结构之后，用于接收第一倍频结构形成的532nm激光束并将其转换为266nm的高功率紫外激光束；其中，第二倍频结构包括四倍频晶体组件，四倍频晶体组件由沿激光出射光路依次设置的第一BBO晶体、CLBO晶体和第二BBO晶体组合构成，用于对沿激光出射光路出射的532nm激光束进行倍频转换，以获取266nm的高功率紫外激光束。因此，基于本发明的266nm固体激光器，在保证266nm激光功率输出的情况下，使用BBO晶体和CLBO晶体两种非线性晶体级联的方式，提高了输出光束质量，同时还延长了晶体的使用寿命以及降低了激光器成本。

Measurement device and measurement method for concentration of contaminants in water

A measurement device and a measurement method for a concentration of contaminants in water. A passively Q-switched fiber laser (22) generates a Q-switched pulse laser signal, outputs, after the signal is transmitted by an evanescent field fiber (11), an evanescent wave to a water sample to be detected, and also outputs the result of the output repetition frequency of the passively Q-switched fiber laser (22), on the basis of the change of the evanescent wave, which is caused by the absorption effect of contaminants in the water sample to be detected on the evanescent wave, and on the basis of the change of the output repetition frequency of the passively Q-switched fiber laser (22), which is caused by the change of the evanescent wave. The measurement method is simple, and the measurement device based on the measurement method has a simple structure and is low in costs.

A kind of certainty soliton frequency comb generation system and method based on microcavity

本发明涉及一种光学频率梳，具体的涉及一种基于微腔的确定性光孤子频梳产生系统与方法，包括泵浦激光系统、辅助激光系统、封装的微环谐振腔和温度控制器；其中泵浦激光系统和辅助激光系统由一个固定波长或可调波长的窄线宽激光器、光放大器、偏振控制器和光学环形器构成。温度控制系统由半导体制冷器及其控制器构成，或者由片上集成的金属线和电流控制系统构成。本发明采用温度调谐微环谐振腔谐振峰位置的方案，实现微腔光孤子频梳的确定性产生。本发明所提供的方案具有结构简单、成本低和可操控性强的优势，解决了微腔光频梳产生过程中对高频器件的依赖问题，在未来微腔光频梳应用领域具有重要的实用价值。

Plane waveguide type laser and display device

A plane waveguide type laser according to the present invention includes: a plate-shaped laser medium ( 5 ); a semiconductor laser ( 1 ) which causes excitation light to enter an end surface ( 5 a ) of the laser medium ( 5 ); first and second claddings ( 4 a and 4 b ) which are bonded to lower and upper surfaces of the laser medium ( 5 ), respectively, to form a waveguide in a vertical direction; a comb heat sink ( 2 ) bonded to a lower surface of the first cladding ( 4 a ); and thermal lens producing means ( 20 ) bonded to an upper surface of the second cladding ( 4 b ). In this structure, laser oscillation in the vertical direction is performed in a waveguide mode of the laser medium ( 5 ), and the thermal lens producing means ( 20 ) forms a periodic lens effect in the laser medium ( 5 ) to perform laser oscillation in a lateral direction in a plurality of resonant modes. Therefore, a resonator having a small round-trip loss maybe formed without depending on a size of a thermal lens produced by excitation, and hence a rising characteristic of a pulse operation or a CW operation may be smoothed to obtain high-power stable output.

Temperature control of laser action in scattering media

A random laser system includes critical Solution Temperature (CST) material, either a Lower CST (LCST) or an Upper CST (UCST) material, in combination with an optical gain medium (20), such as a laser dye. A laser-like emission is observed in response to optical pumping (12) only when the CST material is in a scattering state. The random laser is suitable for being microencapsulated (10), and can be used for, as examples, remote temperature (14) sending applications as well as for visual display applications.

MICROLASER WITH MODULATED EMISSION FREQUENCY

L'invention concerne une cavité microlaser comportant: - un milieu actif solide (2), - un miroir d'entrée (4), - un miroir de sortie (6), - une couche (8) d'un matériau résistif étant formé sur une des faces de la microcavité, cette couche ayant des propriétés optiques de transparence et de réflectivité adaptées à la face de la microcavité sur laquelle elle est déposée.

Method for controlling laser beam pointing angle through thermal effect

本发明涉及一种利用热效应控制激光光束指向角的方法，其特征是：至少包括工作激光器、热控激光器和激光介质，工作激光器发出一个波长为λ 1 的激光光束，波长为λ 1 的激光光束通过耦合单元进入激光介质后输出；热控激光器发出波长为λ 2 的激光光束进入激光介质，激光介质吸收波长为λ 2 的激光光束的能量，在波长为λ 1 的激光光束通过激光介质的光路上产生热效应，调整波长为λ 2 的激光能量大小，控制波长为λ 1 的激光光束偏转方向。该方法以便在不采用机械转动装置情况下，方便、快捷调节激光光束的传播方向，使激光光束能及时跟踪目标。

Modular fiber-based chirped pulse amplification system

A modular ultrafast pulse laser system is constructed of individually pre-tested components manufactured as modules. The individual modules include an oscillator, pre-amplifier and power amplifier stages, a non-linear amplifier, and a stretcher and compressor. The individual modules can typically be connected by means of simple fiber splices.

System and method for limiting the effective coherence length of a solid-state laser in holographic recording

The effective coherence length of a single-frequency, solid-state laser is limited to reduce spurious, secondary holograms in conjunction with a holographic recording. The wavelength of the laser is varied or 'scanned' with high precision over a very small wavelength range. In an embodiment, the temperature of the laser's resonant cavity optical bench is altered, causing the dimension of the cavity to change and the emission wavelength to move in a controlled manner. The changing wavelength is monitored at high resolution, and a feedback control loop updates the temperature set-point to keep the monitored laser wavelength moving at a desired rate of change through a desired range. As the wavelength of the laser is scanned, the phase of the holographic interference pattern is locked at a position of maximum coherence/contrast within the holographic film aperture.

Temperature compensation packaging device for fiber laser

一种光纤激光器温度补偿封装装置，包括光纤激光器、设有V型凹槽的金属底座和金属盖板；所述的光纤激光器由一端在光纤上光刻的布拉格光栅组成，所述的光纤激光器嵌入V型凹槽中且与V型凹槽热接触，所述的金属底座的热膨胀系数远大于金属盖板的热膨胀系数。本发明结合了无源光纤光栅的温度补偿技术与光纤激光器的传统封装技术，将光纤激光器固定在金属结构中保证其可靠性的同时，实现温度的补偿效应，进一步提升光纤激光器的性能，更好的满足相关科研领域及工程应用的需要。

Spherical liquid-crystal laser

본 발명은 레이저 빛의 포인트 소스로 사용되는 하나 또는 하나 이상의 키랄 액정 방울에 관한 것이다. 소스는 키랄 액정들(1)로 된 액정 방울과 액정들 내에 분산되는 활성 매질의 형태로 되어 있다. 소스는 구형(求刑)이고 크기는 수 나노미터에서 100 마이크로미터 사이이다. 액정 방울은 키랄 액정들(1)로 구성되어 있으며, 상기 키랄 액정은 활성 매질의 방출 영역에서 선택적으로 반사를 하고, 콜레스테릭 액정일 수 있으며, 네마틱 액정과 키랄 도판트 또는 또 다른 키랄 액정 페이즈, 바람직하게는 블루 페이즈, 강유전성 페이즈(ferroelectric phase), 반강유전성 페이즈(antiferroelectric phase), 강유전성 페이즈 중 어느 하나 또는 키랄일 필요가 없는 부드러운 물질로 된 또 다른 키랄 페이즈의 혼합물일 수 있다.

Side-pumped solid-state laser source, and pumping process for a solid-state laser source

The side-pumped solid-state laser source comprises a resonant cavity defined by at least two spaced-apart mirrors, an active medium of laser crystal type placed in said resonant cavity, and a pumping source, the layout of the resonant cavity, defined by the crystal and by the mirrors, being arranged to cause spatial inversion of the oscillating mode within the active medium in the absorption direction of the pumping beam, such as to symmetrize the thermal focal length seen by the oscillating mode. The laser source comprises lenses for conditioning the pumping beam emitted by the pumping source, to form on the side face of the laser crystal a pumping spot arranged to symmetrize the spatial quality of the emitted laser beam and/or active control means for the laser crystal temperature, in order to correct its undesired astigmatic effects. The pumping process for the solid-state laser source generates on the side face of the laser crystal a pumping spot arranged to symmetrize the spatial quality of the emitted laser beam, in such a manner as to correct its undesired astigmatism effects.

Frequency conversion of optical radiation

An intracavity frequency-modified laser of improved amplitude stability is obtained by substantially eliminating spatial hole burning in the lasant material and maintaining the optical cavity of the laser at a temperature which results in substantially noise-free generation of output radiation.

Frequency conversion temperature control fiber laser system

一种变频温控光纤激光器系统，包括温度控制平台和控制系统，温度控制平台上设置若干半导体激光器、N+1光纤合束器和光纤增益腔，光纤增益腔的输出端连接光纤输出光缆；控制系统包括控制电路与控制系统软件，控制系统软件包括半导体激光器供电控制系统、温度控制系统与温度监控系统，半导体激光器供电控制系统与半导体激光器相连接，温度监控系统与温度控制系统相连接，温度控制系统的输出端与相变式变频压缩热量交换系统的控制端相连接，相变式变频压缩热量交换系统的冷媒流道与温度控制平台相连接。本发明克服了现有光纤激光器非水冷技术的不足，可实现一台激光器输出多种不同的光束形状，通过单台激光器就可以分别实现光纤激光器、复合激光系统与半导体激光器的功能。

Energy-adjustable pulse cluster fiber laser and regulation and control method

本发明公开了一种能量可调脉冲簇光纤激光器及调控方法，激光器包括：主谐振腔和附属腔；所述主谐振腔用于产生基频锁模脉冲；所述主谐振腔包括：抽运光源、波分复用器、增益光纤、光纤环路器、材料饱和吸收体、偏振控制器和第一光纤耦合器；所述附属腔用于对所述基频锁模脉冲进行调制；所述附属腔包括：分光比可调X型光纤耦合器、光纤延时线和第二光纤耦合器。方法包括旋转偏振控制器的手柄角度与手柄的挤压强度，从而产生基频锁模脉冲，调节X型光纤耦合器的分光比来实现对基频锁模脉冲序列的幅值调制，加热光纤延时线来实现对锁模脉冲序列的脉动时间轮廓的宽度调制，实现激光器输出能量动态可调的脉冲簇。本发明主要用于激光器技术领域。

Temperature control device clamping mechanism and temperature control device clamping system

一种温控装置夹持机构，用于温控装置的夹持，包括旋转固定架、旋转转接板、固定件和支架。旋转固定架包括弧形连接部和固定安装部，弧形连接部的结构为弧形，弧形连接部上开设有腰形孔，固定安装部和弧形连接部的一端固定连接，固定安装部安装于支架上。旋转转接板用于安装温控装置。固定件穿过腰形孔将旋转转接板安装于弧形连接部上，旋转转接板相对于弧形连接部沿腰形孔可移动。此外，还提供一种温控装置夹持系统，包括上述温控装置夹持机构，用于夹持温控装置。上述温控装置夹持机构或温控装置夹持系统，旋转转接板相对于弧形连接部转动可以带动温控装置旋转运动，从而对温控装置内的晶体进行旋转调节，提高温控装置的适应性。

Amplifying device and amplification medium

放大介质(100)包括多孔光纤(110)和树脂部件(120)。多孔光纤(110)让光通过。并且，多孔光纤(110)具有立体卷绕的卷绕部(111)。卷绕部(111)埋入在树脂部件(120)内。放大介质(100)让信号光通过。并且，从光源射出的激励光入射到放大介质(100)。放大介质(100)与光源一起由温度调节部进行温度调节。

Apparatus, method, and computer program product for controlling laser wavelength stability

An apparatus includes a laser that generates a predetermined wavelength when the laser operates at room temperature, the predetermined wavelength being offset from a specific wavelength. The laser has a controlled wavelength range due to a wavelength drift, the wavelength range having a first wavelength as the upper boundary and a second wavelength as the lower boundary, the first wavelength is generated when the laser operates at a first temperature of an ambient and the second wavelength is generated when the laser operates at a predetermined temperature higher than a second temperature of the ambient. The apparatus includes a heater that heats the laser such that a wavelength in the controlled wavelength range that is generated by the laser when heated by the heater from the second temperature is longer than a short wavelength that is generated by the laser centered on the specific wavelength that operates at the second temperature; and a control circuit configured to turn on the heater.

Resolution of mode hopping in the output of laser cavities

An optical system includes a laser cavity on a base. The laser cavity generates a light signal in response to application of an electrical current to the laser cavity. The system includes first electronics that apply a target level of the electrical current to the laser cavity so as to cause the laser cavity to generate the light signal. The light signal experiences mode hops at electrical current levels that shift to higher current levels in response to increasing laser operation times. A first one of the mode hops occurs at a first current level and a second one of the mode hops occurs at a second current level that is higher than the first current level. The system also includes a phase shifter that interacts with the laser cavity so as to shift the mode hops to lower current levels than occur in the absence of the phase shifter.

Light source

To provide a light source capable of generating a fundamental wave of a desired wavelength from a spontaneous emission light and tuning the wavelength of the fundamental wave in a bandwidth of 1060 nm to 1200 nm in the order of 1 nm, a light source 100 includes a semiconductor laser 1, a first optical waveguide 2, a second optical waveguide 3 that absorbs a pumping light emitted from the first optical waveguide 2 and emits a spontaneous emission light of a wavelength longer than a wavelength of the pumping light, a third optical waveguide 4, and a wavelength selecting element 6 provided between the second optical waveguide 3 and the third optical waveguide 4, wherein a resonator k is formed between the semiconductor laser 1 side and an output side to outside sandwiching the wavelength selecting element 6. The laser light is output with a wavelength tuned in the order of 1 nm by controlling length of the second optical waveguide 3.

基于分区间预热与非平衡功率锁定的抗温度干扰激光稳频方法与装置

本发明提出基于分区间预热与非平衡功率锁定的抗温度干扰激光稳频方法与装置。涉及激光干涉测量领域。本发明针对宽温域环境下的激光器稳频问题，提出并结合分区间预热方法与非平衡功率锁定稳频方法，通过环境温度分区间划分，使激光器在所设定的温度范围内稳频至单温度点，利用非平衡功率锁定方案，通过实验建立激光频率模型以修正稳频基准点，补偿激光频率随温度的漂移。本发明方法及装置的有效工作环境温度范围达到‑20～40℃，激光频率相对准确度优于1.0×10 ‑8 ，可在极端温度下实现激光的高准确度稳频，有效地提高了激光器在宽温域条件下的抗干扰性能。

Laser oscillator

A laser oscillator having a condensation prevention mechanism capable of extending the life span of a light emitting device while maintaining cost effectiveness as compared to the conventional technique is provided. The laser oscillator includes: a laser beam generating unit; a heat exchanger; a coolant bypass circuit; a coolant circuit connecting these components; a housing storing these components; a coolant circulating unit that circulates a coolant to the laser beam generating unit, the heat exchanger, and the coolant bypass circuit with the aid of the coolant circuit; a first valve that adjusts a flow rate of the coolant supplied to the laser beam generating unit; a second valve that adjusts a flow rate of the coolant supplied to the heat exchanger; a third valve that adjusts the flow rate of the coolant supplied to the coolant bypass circuit; a dew point measuring unit that measures a dew point inside the housing; a temperature measuring unit that measures a coolant temperature; and a control unit that controls the first, second, and third valves on the basis of the dew point and the coolant temperature.

端面泵浦碱金属蒸气激光器用温控式蒸气池

本发明公开了一种端面泵浦碱金属激光器用温控式蒸气池结构，包括：不锈钢碱金属蒸气池腔体，蒸气池腔体两端分别设置碱金属激光器用玻璃窗口，碱金属蒸气池用温控管布置在蒸气池腔体中轴位置，温控管采用水冷方式和加热丝加热方式对蒸气池腔体内激光器的工作区域进行温控，蒸气池腔体的侧壁处设置缓冲气体注入口、碱金属储存室，通过碱金属蒸气池用缓冲气体注入口向蒸气池腔体内注入缓冲气体或进行抽真空处理，通过碱金属储存室生成碱金属蒸气。本发明可以有效抑制蒸气池内的温度骤升所引起的光化学反应现象，可有效提高蒸气的利用率和激光器的输出性能，减少蒸气池的损坏几率。

Time and frequency method and system for optical comb

Provided are a time and frequency control method and system for optical comb. The method includes: controlling an optical comb measuring system to start and to generate an optical comb; obtaining monitoring data, wherein the monitoring data comprises a working temperature, a mode-locked frequency and a light pump power, wherein the mode-locked frequency comprises a repetition frequency and a carrier envelope phase locked at the end of starting the optical comb measuring system; determining whether an offset of the mode-locked frequency exceeds a self-feedback adjustment range of a hardware adjustment circuit; and in response to any of the repetition frequency and the carrier envelope phase exceeds the self-feedback adjustment range, adjusting the working temperature and the light pump power until the mode-locked frequency returns back into the self-feedback adjustment range.

레이저 발진소자

레이저 발진 소자가 개시된다. 본 레이저 발진 소자는 제1 기판, 상기 제1 기판의 상부에 구비되어 상기 제1 기판과의 사이에 쐐기형 셀(wedge cell)을 형성하는 제2 기판, 상기 쐐기형 셀에 주입되는 피치가 동일한 액정에 의해 형성되는 액정층 및 쐐기형 셀의 양쪽에 연결되어, 상기 쐐기형 셀의 양쪽의 온도를 다르게 조절하는 온도 컨트롤러를 포함한다.

레이저 발진 소자

레이저 발진 소자가 개시된다. 본 레이저 발진 소자는 제1 기판, 상기 제1 기판의 상부에 구비되어 상기 제1 기판과의 사이에 쐐기형 셀(wedge cell)을 형성하는 제2 기판, 상기 쐐기형 셀에 주입되는 피치가 동일한 액정에 의해 형성되는 액정층 및 쐐기형 셀의 양쪽에 연결되어, 상기 쐐기형 셀의 양쪽의 온도를 다르게 조절하는 온도 컨트롤러를 포함한다.

Fiber optic device operational monitoring

A monitoring device may receive sensor information, associated with an optical device included in a high-power fiber laser, from a set of sensors associated with the optical device. The monitoring device may determine, based on the sensor information, a set of operational properties of the optical device. The set of operational properties may include: a health property that describes a health of one or more components of the optical device, a degradation property that describes degradation of one or more components of the optical device, an environmental property that describes an environment of the optical device, or a process property associated with a process in which the optical device is being used. The monitoring device may identify whether an operational property, of the set of operational properties, satisfies a condition, and may selectively perform a monitoring action based on whether the operational property satisfies the condition.