LASER COOLER HAS STRONG EFFECTIVENESS

The invention concerns a high-performance laser cooling device, for example for cooling systems such as low noise detection and amplification systems. The inventive device comprises for example a laser cooling material (MRL1) for laser cooling a system (SYS) thermally coupled with said material. The interaction of the material with a laser pump (PMP1) of predetermined frequency w1 results in the spontaneous isotropic emission of protons of frequency omega 1 identical to the frequency of the pump beam and photons of frequency omega 2 higher than frequency omega 1 of the pump beam, the emission of the latter protons causing the cooling material to be cooled. The inventive device further comprises recirculating means for sending back towards the laser cooling material (MRL1) the frequency omega 1 photons. In one particular embodiment, the recirculating means comprise a shell (COQ) spherical in shape, at the centre of which is placed the cooling material (MRL1), thermally insulated from the cooling material. The shell is coated with a treating coat (TRT1) reflecting the omega 1 frequency protons and with a coat (TRT2) converting the omega 2 frequency protons into omega 1 frequency protons, the converting coat covering the reflecting treatment coat (TRT1). The inventive device considerably enhances the cooling efficiency of laser cooling devices.

All solid state optical cryocooler using intracavity optically pumped semiconductor lasers and a method of making the same

A device and corresponding method for cooling electronics is disclosed. The device is an all-solid-state optical cryocooler and can include an optically pumped semiconductor laser (OPSL); a cavity configured to receive and control absorption of the optically pumped semiconductor laser, the cavity having a high reflection (HR) surface and an anti-reflection (AR) surface; and a doped crystal housed within the cavity, the doped crystal configured to cool in response to input of the optically pumped semiconductor laser. The method can include supplying an intracavity optically pumped semiconductor lasers to a doped crystal within a cavity; and configuring the cavity to include a high reflection (HR) surface and an anti-reflection (AR) surface, the HR surface and AR surface formed on or in connection with the doped crystal to increase pump light absorption at the crystal within the cavity.

Localized cooling device

L’invention concerne un dispositif de refroidissement localisé comprenant : Un organe de refroidissement (13), Un cristal (11) à capacité de refroidissement par absorption d'un signal lumineux d'excitation proche infrarouge, Un système d'illumination (14) destiné à fournir un signal lumineux d'excitation, Ledit cristal (11) comportant une forme allongée autour d'un axe longitudinal entre une extrémité proximale et une extrémité distale et présentant une section transversale externe constante fermée et un canal central réalisé à partir de son extrémité distale, sur au moins une partie de sa longueur, Ledit organe de refroidissement (13) comportant une tige encastrée par une première extrémité dans ledit canal central dudit cristal et comportant une deuxième extrémité saillante formant un doigt de refroidissement (130). Figure à publier avec l'abrégé : Fig. 2A

ENERGY CONVERSION SYSTEM

A method of emitting photons at a desired wavelength, including: providing a material having a first region of high absorption of radiation at a first set of wavelength of radiation, contiguous with a second region of low absorption of radiation at a shorter set of wavelengths, and a third region of high emission at a further shorter set of wavelengths; applying energy to the material at the first region, such that most of an effective black body radiation of said material at a temperature of the material would fall within the second region and be configured to transfer energy to said third region and not overlap with the first region; and emitting energy from the material at the third region, powered by said applying energy.

A non-exothermic quasi-two level laser

LASER COOLER HAS STRONG EFFECTIVENESS

COOLING DEVICE LOCATES AN ORGAN

High power CW mid-IR laser

The present invention provides a rotating chalcogenide gain media ring to provide un-precedented power generation with minimal thermal lensing for CW lasing in the mid-IR spectrum.

Optical refrigerator using reflectivity tuned dielectric mirror

Fluorescent refrigeration

Fluorescent refrigeration is based on selective radiative pumping, using substantially monochromatic radiation, of quantum excitations which are then endothermically redistributed to higher energies. Ultimately, the populated energy levels radiatively deexcite emitting, on the average, more radiant energy than was initially absorbed. The material utilized to accomplish the cooling must have dimensions such that the exciting radiation is strongly absorbed, but the fluorescence may exit the material through a significantly smaller optical pathlength. Optical fibers and mirrored glasses and crystals provide this requirement.

COOLING AN ACTIVE MEDIUM USING RAMAN SCATTERING

COOLING DEVICE LOCATES AN ORGAN

L'invention concerne un dispositif de refroidissement (1) localisé d'un organe, comportant : Une tige (10) de forme allongée comportant une extrémité distale destinée à venir en contact avec un organe à refroidir et comportant : ○ Un élément de refroidissement (11) comportant un doigt froid (110), ○ Un cristal (13) à capacité de refroidissement par excitation à une longueur d'onde d'excitation déterminée, positionné de manière adjacente audit élément de refroidissement, ○ Un guide optique (15) apte à véhiculer un signal lumineux à ladite longueur d'onde d'excitation et débouchant sur ledit cristal (13), Un système d'illumination (17) comportant au moins une source (S) de lumière agencée pour émettre ledit signal lumineux. The invention relates to a localized cooling device (1) for an organ, comprising: an elongated rod (10) having a distal end intended to come into contact with a body to be cooled and comprising: ○ a cooling element ( 11) having a cold finger (110), ○ A crystal (13) with cooling capacity by excitation at a determined excitation wavelength, positioned adjacent to said cooling element, ○ An optical guide (15) capable of conveying a light signal at said excitation wavelength and opening onto said crystal (13), an illumination system (17) comprising at least one light source (S) arranged to emit said light signal.

Semiconductor-based optical refrigerator

Optical refrigerators using semiconductor material as a cooling medium, with layers of material in close proximity to the cooling medium that carries away heat from the cooling material and preventing radiation trapping. In addition to the use of semiconducting material, the invention can be used with ytterbium-doped glass optical refrigerators.

Anti-Stokes-fluorescence-cooled fiber-based gain element

Fiber-based gain elements, such as fiber lasers, fiber amplifiers, and the like, that have higher power and better frequency stability than can be achieved in the prior art are presented. Embodiments include a fiber-based gain element having a first portion in which anti-Stokes fluorescence (ASF) reduces its temperature below that of an ambient environment and a second portion whose temperature is not reduced below that of the ambient environment, which are thermally coupled so heat can flow from the second portion into the first portion, thereby reducing the average temperature of the gain element. In some embodiments, a core configured to provide optical gain is thermally coupled with a first cladding configured to exhibit ASF cooling via an intervening cladding layer that acts to confine a first pump signal to the core.

COOLING AN ACTIVE MEDIUM USING RAMAN SCATTERING

A method is described for setting up a system comprising an active medium. The method comprises thermally controlling the system comprising an active medium by radiative cooling. The radiative cooling thereby is based on stimulated and/or coherent Raman scattering processes. In particular embodiments, the thermally controlling may be obtained by tailoring the efficiencies of the Raman scattering processes by optimising at least one of a number of system parameters. The invention furthermore relates to systems thus obtained, to methods for thermally controlling systems comprising an active medium that generate radiation and to computer program products for performing the methods for setting up systems comprising an active medium and thermally controlled by radiative cooling using stimulated and/or coherent Raman scattering processes.

Anti-Stokes-Fluorescence-Cooled Fiber-Based Gain Element

This disclosure enables laser-based gain elements, such as fiber lasers, fiber amplifiers, and the like, that have higher power and better frequency stability than can be achieved in the prior art. Embodiments disclosed herein include a fiber-based gain element having a first portion in which anti-Stokes fluorescence (ASF) reduces its temperature below that of an ambient environment and a second portion whose temperature is not reduced below that of the ambient environment. The fiber-based gain element is arranged such that the first and second portions are thermally coupled so heat can flow from the second portion into the first portion, thereby reducing the average temperature of the gain element. In some embodiments, a core configured to provide optical gain is thermally coupled with a first cladding configured to exhibit ASF cooling via an intervening cladding layer that acts to confine a first pump signal to the core.

COOLING AN ACTIVE MEDIUM USING RAMAN SCATTERING

A method is described for setting up a system comprising an active medium. The method comprises thermally controlling the system comprising an active medium by radiative cooling. The radiative cooling thereby is based on stimulated and/or coherent Raman scattering processes. In particular embodiments, the thermally controlling may be obtained by tailoring the efficiencies of the Raman scattering processes by optimising at least one of a number of system parameters. The invention furthermore relates to systems thus obtained, to methods for thermally controlling systems comprising an active medium that generate radiation and to computer program products for performing the methods for setting up systems comprising an active medium and thermally controlled by radiative cooling using stimulated and/or coherent Raman scattering processes.

고 파워 CW 중-IR 레이저

... 본 발명은 회전하는 칼코게니드 이득 매체 링을 제공하여 중-IR 스펙트럼에서의 CW 레이징에 대한 최소의 열적 렌징으로 전례없는 파워 생성을 제공한다.

Multiple single frequency laser system and method of optical manipulaton of molecules

A multiple single frequency laser for optical manipulation of molecules is presented. The multiple single frequency laser comprises generally a multiline laser source which utilizes one sample of molecular species as a source for the generation of optical radiation for manipulating (e.g., cooling) a second, separate sample of the same species of molecules. More specifically, the multiple single frequency (MSF) laser comprises a master controller for controlling the frequency of powerful single frequency pump lasers. Laser beams from the pump lasers excite coherent Raman transitions in molecules contained in a Raman gain cell. These beams are tuned to specific optical transitions in an electronic band of molecules. The molecules contained in the Raman gain cell generate the multiple frequencies needed to manipulate (e.g., cool) the same species of molecules in a second, separate sample. The Raman gain cell provides an output beam which is presented to a multistage optical amplifier for generating an amplified output beam. The amplified output beam is presented to a wavelength selector where unwanted frequencies are eliminated resulting in a MSF output beam. MSF output beam includes multiple laser frequencies all of which are synchronously controlled by controlling the frequency of the pump laser via the controller.

Solid state optical refrigeration using stark manifold resonances in crystals

A method and device for cooling electronics is disclosed. The device includes a doped crystal configured to resonate at a Stark manifold resonance capable of cooling the crystal to a temperature of from about 110K to about 170K. The crystal host resonates in response to input from an excitation laser tuned to exploit the Stark manifold resonance corresponding to the cooling of the crystal.

Optically Cooled Platform For Thermal Management Applications

A semiconductor device comprising a waveguide having a core, said core having inserted therein one or more layers of nanoemitters.

DUAL CHANNEL METHOD FOR PUMPING AND COOLING LASERS AND LASER DEVICE

A laser pumping method pumps a primary amount of energy into a laser medium to populate an intermediate level near an upper laser level. A lesser amount of energy is pumped into the laser medium to populate an excited level that lies above the upper laser level and transfers atomic or molecular population to the upper laser level by a nonradiative process. A laser device includes a laser medium supporting four levels, including a lower laser level, an upper laser level, an excited level above the laser level from which population transfers to the upper laser level via nonradiative transition, and an intermediate level within a few kT of the upper laser level.

Energy conversion system

A method of emitting photons at a desired wavelength, including: providing a material having a first region of high absorption of radiation at a first set of wavelength of radiation, contiguous with a second region of low absorption of radiation at a shorter set of wavelengths, and a third region of high emission at a further shorter set of wavelengths; applying energy to the material at the first region, such that most of an effective black body radiation of said material at a temperature of the material would fall within the second region and be configured to transfer energy to said third region and not overlap with the first region; and emitting energy from the material at the third region, powered by said applying energy.

HIGH-PERFORMANCE LASER COOLING DEVICE

The invention concerns a high-performance laser cooling device, for example for cooling systems such as low noise detection and amplification systems. The inventive device comprises for example a laser cooling material (MRL1) for laser cooling a system (SYS) thermally coupled with said material. The interaction of the material with a laser pump (PMP1) of predetermined frequency w1 results in the spontaneous isotropic emission of protons of frequency ¿1 identical to the frequency of the pump beam and photons of frequency ¿2 higher than frequency ¿1 of the pump beam, the emission of the latter protons causing the cooling material to be cooled. The inventive device further comprises recirculating means for sending back towards the laser cooling material (MRL1) the frequency ¿1 photons. In one particular embodiment, the recirculating means comprise a shell (COQ) spherical in shape, at the centre of which is placed the cooling material (MRL1), thermally insulated from the cooling material. The ...

LASER COOLING VIA STIMULATED PHOTON EMISSIONS

An example laser cooling system may include a first laser to induce a transition of a plurality of electrons in a medium to an excited energy state via absorption of photons. The laser cooling system may also include a second laser to stimulate emission from the medium of emitted photons having a higher energy than an energy of the absorbed photons.

ENERGY CONVERSION SYSTEM

A method of emitting photons at a desired wavelength, including: providing a material having a first region of high absorption of radiation at a first set of wavelength of radiation, contiguous with a second region of low absorption of radiation at a shorter set of wavelengths, and a third region of high emission at a further shorter set of wavelengths; applying energy to the material at the first region, such that most of an effective black body radiation of said material at a temperature of the material would fall within the second region and be configured to transfer energy to said third region and not overlap with the first region; and emitting energy from the material at the third region, powered by said applying energy.

Low-internal-heat solid laser amplifier

SELF-COOLED LASER INTEGRATED DEVICE AND SUBSTRATE ARCHITECTURE

Embodiments are generally directed to a self-cooled laser integrated device and substrate architecture. An embodiment of a device includes a substrate or printed circuit board (PCB); a component coupled with the substrate or PCB, the component including an cooling agent on at least one side of the component; one or more laser sources, at least a first laser source of the one or more laser sources being implemented to direct laser light onto the cooling agent; and a controller to drive the laser source, wherein the cooling agent provides cooling for the component when the laser light is directed on the engineered cooling agent. 1. A device comprising:a substrate or printed circuit board (PCB);a component coupled with the substrate or PCB, the component including a cooling agent on at least one side of the component;one or more laser sources, at least a first laser source of the one or more laser sources being implemented to direct laser light onto the cooling agent; anda controller to drive the laser source;wherein the cooling agent provides cooling for the component when the laser light is directed on the engineered cooling agent.2. The device of claim 1 , further comprising an optical chip claim 1 , the optical chip being coupled with the component claim 1 , the optical chip to process laser light generated by the one or more laser sources.3. The device of claim 1 , wherein the first laser source is to direct laser light onto the engineered cooling agent when the first laser source is enabled.4. The device of claim 1 , wherein the cooling agent provides cooling in response to the anti-Stokes phenomenon.5. The device of claim 1 , wherein the cooling agent includes CdS (cadmium sulfide) applied as an engineered cooling agent.6. The device of claim 1 , wherein the first laser source is to provide light in a green frequency.7. The device of claim 1 , wherein the device is a wearable device.8. The device of claim 1 , wherein the component is a computation/communication ...

OPTICAL REFRIGERATOR USING REFLECTIVITY TUNED DIELECTRIC MIRROR

Optical refrigerator using reflectivity tuned dielectric mirrors (12, 14). Selected working materials (10) can be optically pumped using monochromatic radiation such that the resulting fluorescence has an average photon energy higher than that of the pumping radiation; that is, net anti-Stokes fluorescence. If the quantum efficiency is sufficiently high, the working material will cool, and an optical refrigeration can be achieved. Parallel mirrored faces are employed to increase the optical path of the incident pumping radiation within the working material by multiple reflections. Reflectivity tuned dielectric mirrors which allow higher-energy fluorescence photons to readily escape from the working material while inhibiting the escape of the lower-energy photons which are consequently partially trapped in the working material (10) and ultimately reabsorbed and refluoresced at higher energies are employed. This increase the optical refrigerator efficiency. An efficient geometry for the cooling ...

HIGH-PERFORMANCE LASER COOLING DEVICE

The invention concerns a high-performance laser cooling device, for example for cooling systems such as low noise detection and amplification systems. The inventive device comprises for example a laser cooling material (MRL1) for laser cooling a system (SYS) thermally coupled with said material. The interaction of the material with a laser pump (PMP1) of predetermined frequency w1 results in the spontaneous isotropic emission of protons of frequency φ1 identical to the frequency of the pump beam and photons of frequency φ2 higher than frequency φ1 of the pump beam, the emission of the latter protons causing the cooling material to be cooled. The inventive device further comprises recirculating means for sending back towards the laser cooling material (MRL1) the frequency φ1 photons. In one particular embodiment, the recirculating means comprise a shell (COQ) spherical in shape, at the centre of which is placed the cooling material (MRL1), thermally insulated from the cooling material. The shell is coated with a treating coat (TRT1) reflecting the φ1 frequency protons and with a coat (TRT2) converting the φ2 frequency protons into φ1 frequency protons, the converting coat covering the reflecting treatment coat (TRT1). The inventive device considerably enhances the cooling efficiency of laser cooling devices.

Optically cooled platform for thermal management applications

A semiconductor device comprising a waveguide having a core, said core having inserted therein one or more layers of nanoemitters.

OPTICAL REFRIGERATOR USING REFLECTIVITY TUNED DIELECTRIC MIRROR

Optical refrigerator using reflectivity tuned dielectric mirrors (12, 14). Selected working materials (10) can be optically pumped using monochromatic radiation such that the resulting fluorescence has an average photon energy higher than that of the pumping radiation; that is, net anti-Stokes fluorescence. If the quantum efficiency is sufficiently high, the working material will cool, and an optical refrigeration can be achieved. Parallel mirrored faces are employed to increase the optical path of the incident pumping radiation within the working material by multiple reflections. Reflectivity tuned dielectric mirrors which allow higher-energy fluorescence photons to readily escape from the working material while inhibiting the escape of the lower-energy photons which are consequently partially trapped in the working material (10) and ultimately reabsorbed and refluoresced at higher energies are employed. This increase the optical refrigerator efficiency. An efficient geometry for the cooling ...

A NON-EXOTHERMIC QUASI-TWO LEVEL LASER

A method for selecting laser and pump frequencies for a quasi-two level solid state laser (10) with a selected laser host (12) and operating the laser with the selected laser and pump frequencies, the host (12) having a fluorescence probability P(v) over a frequency range vi to vf, the method has the steps of: determining for the laser host (12), a power weighted average fluorescence frequency given by 1/(vf - vi) times the integral from vi to vf of v*P(v) dv; selecting an output frequency vL for the quasi-two level solid state laser (10) to satisfy the expression vL < , and tuning the laser (10) for laser emission at the vL; and selecting the pump frequency vP for the quasi-two level solid state laser (10) to satisfy the expression vL < vP < , and optically pumping the laser host (12) with a laser pump (14) to produce laser emission at the vL. This will provide athermal laser operation.

Low internal heat solid laser amplifier

本发明提供了低内热固体激光放大器，该低内热固体激光放大器包括：增益介质；长波长泵浦光生成模块，其包括泵浦源、工作物质和谐振腔，泵浦源位于谐振腔外，工作物质位于谐振腔内；长波长泵浦光控制模块，其位于长波长泵浦光生成模块中的谐振腔内的长波长泵浦光振荡路径；其中，在长波长泵浦光振荡路径中工作物质出射的光直接入射至增益介质的侧面，且该增益介质贯通长波长泵浦光振荡路径。

ENERGY CONVERSION SYSTEM

A method of emitting photons at a desired wavelength, including: providing a material having a first region of high absorption of radiation at a first set of wavelength of radiation, contiguous with a second region of low absorption of radiation at a shorter set of wavelengths, and a third region of high emission at a further shorter set of wavelengths; applying energy to the material at the first region, such that most of an effective black body radiation of said material at a temperature of the material would fall within the second region and be configured to transfer energy to said third region and not overlap with the first region; and emitting energy from the material at the third region, powered by said applying energy.

High power CW mid-ir laser

Optical refrigerator using reflectivity tuned dielectric mirrors

Optical refrigerator using reflectivity-tuned dielectric mirrors. Selected working materials can be optically pumped using monochromatic radiation such that the resulting fluorescence has an average photon energy higher than that of the pumping radiation; that is, net anti-Stokes fluorescence. If the quantum efficiency is sufficiently high, the working material will cool and optical refrigeration can be achieved. Parallel mirrored faces are employed to increase the optical path of the incident pumping radiation within the working material by multiple reflections. Reflectivity-tuned dielectric mirrors which allow higher-energy fluorescence photons to readily escape from the working material while inhibiting the escape of the lower-energy photons which are consequently partially trapped in the working material and ultimately reabsorbed and refluoresced at higher energies are employed. This increases the optical refrigerator efficiency. An efficient geometry for the cooling material is a disk ...

Non-exothermic quasi-two level laser

A method for selecting laser and pump frequencies for a quasi-two level solid state laser with a selected laser host and operating the laser with the selected laser and pump frequencies, the host having a fluorescence probablility P() over a frequency range from i to f, has the steps: (a) determining for the laser host, a power weighted average fluorescence frequency given by(b) selecting an output frequency L for the quasi-two level solid state laser to satisfy the expression L<, and tuning the laser for laser emission at the L; and (c) selecting a pump frequency P for the quasi-two level solid state laser to satisfy the expression L, and optically pumping the laser host with a laser pump to produce laser emission at the L. This invention will provide athermal laser operation.

Laser cooling via stimulated photon emissions

An example laser cooling system may include a first laser to induce a transition of a plurality of electrons in a medium to an excited energy state via absorption of photons. The laser cooling system may also include a second laser to stimulate emission from the medium of emitted photons having a higher energy than an energy of the absorbed photons.

LASER DESIGN

A laser gain element including an undoped layer of a monoclinic double tungstate (MDT) crystal, and a method of forming a laser gain element are provided. The laser gain element includes a layer of doped MDT crystal adjacent to the undoped layer, the doped MDT layer including a pre-selected concentration of rare earth ions. The layer of doped MDT crystal has an absorption peak at a first wavelength and an emission peak at a second wavelength longer than the first wavelength; and the layer of doped MDT crystal has a fluorescence emission with a weighted average at a third wavelength shorter than the first wavelength. A laser resonator cavity formed with a plurality of composite gain elements as above is also provided.

Laser design

A laser gain element including an undoped layer of a monoclinic double tungstate (MDT) crystal, and a method of forming a laser gain element are provided. The laser gain element includes a layer of doped MDT crystal adjacent to the undoped layer, the doped MDT layer including a pre-selected concentration of rare earth ions. The layer of doped MDT crystal has an absorption peak at a first wavelength and an emission peak at a second wavelength longer than the first wavelength; and the layer of doped MDT crystal has a fluorescence emission with a weighted average at a third wavelength shorter than the first wavelength. A laser resonator cavity formed with a plurality of composite gain elements as above is also provided.

Multiple single frequency laser system and method of optical manipulaton of molecules

A multiple single frequency laser for optical manipulation of molecules is presented. The multiple single frequency laser comprises generally a multiline laser source which utilizes one sample of molecular species as a source for the generation of optical radiation for manipulating (e.g., cooling) a second, separate sample of the same species of molecules. More specifically, the multiple single frequency (MSF) laser comprises a master controller for controlling the frequency of powerful single frequency pump lasers. Laser beams from the pump lasers excite coherent Raman transitions in molecules contained in a Raman gain cell. These beams are tuned to specific optical transitions in an electronic band of molecules. The molecules contained in the Raman gain cell generate the multiple frequencies needed to manipulate (e.g., cool) the same species of molecules in a second, separate sample. The Raman gain cell provides an output beam which is presented to a multistage optical amplifier for generating ...

No-vibration cryogenic cooling of reference cavities for high-precision metrology using optical refrigeration

Provided is a method and system for stabilizing a property of a first laser beam from a first laser in a vibration-free and cryogen free-manner. The method can include optically cooling a ytterbium-doped yttrium lithium fluoride (Yb:YLF) crystal using a second laser beam; coupling the crystal to a thermal coupling, wherein the thermal coupling is further coupled to a reference cavity to maintain a temperate of the reference cavity; directing a portion of the first laser beam through the reference cavity onto a photodetector to measure the property of the first laser beam; and stabilizing the first laser beam using a feedback control mechanism using the photodetector.

RADIATION-BALANCED FIBER LASER

An apparatus and method for cooling an optical fiber, comprising impinging electromagnetic radiation from a laser on an optical fiber comprising a core, in which the electromagnetic radiation is substantially confined, and a cladding, in thermal communication with the core, configured to provide optically activated cooling of the core via the electromagnetic radiation from the laser.

DEVICE FOR COOLING LOCALLY

A device for cooling locally, including a cooling member, a crystal having the capacity to cool via absorption of a near-infrared exciting light signal, an illuminating system intended to deliver an exciting light signal, the crystal having an elongate shape about a longitudinal axis between a near end and a far end and having a closed constant outside cross section and containing a central channel formed, from its far end, over at least some of its length, the cooling member including a rod embedded via a first end into the central channel of the crystal and including a protruding second end that forms a cooling finger.

CTE-matched textured heatlinks for optical refrigeration

An optical refrigeration system that includes a heatlink that is formed by textured crystals that are matched in coefficient of thermal expansion (CTE) to the yttrium lithium fluoride (YLF) cooling crystal, and shaped in geometries that result in very low heat producing losses (HPL). The optical refrigeration system may further include a mirror that is made of a semiconductor-material.

Fluorescent refrigeration

Fluorescent refrigeration is based on selective radiative pumping, using substantially monochromatic radiation, of quantum excitations which are then endothermically redistributed to higher energies. Ultimately, the populated energy levels radiatively deexcite emitting, on the average, more radiant energy than was initially absorbed. The material utilized to accomplish the cooling must have dimensions such that the exciting radiation is strongly absorbed, but the fluorescence may exit the material through a significantly smaller optical pathlength. Optical fibers and mirrored glasses and crystals provide this requirement.

Optical Refrigerator

An optical refrigerator comprises a laser source, a cooling crystal, a cavity for enhancing the absorption of the laser light in the cooling crystal, a thermal link which connects a cold finger to the cooling crystal and prevents the fluorescence from heating the cold finger, an absorbing chamber to remove the fluorescence and eliminate the waste heat, an a mechanical support that keeps the cooling crystal properly aligned with the laser beam and minimizes heat leakage.

Dual channel method for pumping and cooling lasers and laser device

A laser pumping method pumps a primary amount of energy into a laser medium to populate an intermediate level near an upper laser level. A lesser amount of energy is pumped into the laser medium to populate an excited level that lies above the upper laser level and transfers atomic or molecular population to the upper laser level by a nonradiative process. A laser device includes a laser medium supporting four levels, including a lower laser level, an upper laser level, an excited level above the laser level from which population transfers to the upper laser level via nonradiative transition, and an intermediate level within a few kT of the upper laser level.

HIGH POWER CW MID-IR LASER

The present invention provides a rotating chalcogenide gain media ring to provide un-precedented power generation with minimal thermal lensing for CW lasing in the mid-IR spectrum. 1. A continuous wave (“CW”) mid-IR laser comprising:a resonant cavity;a gain medium selected from polycrystalline transition metal doped II-VI materials (“TM:II-VI), the gain medium being formed into a ring defined by an inner and outer circumference and upstream and downstream faces with a portion of the upstream and downstream faces being positioned within the resonant cavity;a pump source; anda motor to which the ring is mounted; and whereby the portion of the ring being in the resonant cavity receives pump light sufficient to emit a CW laser beam at a wavelength in the mid-IR spectrum.2. The CW laser of claim 1 , wherein a face of the gain medium further comprises a reflective coating fixed thereto.3. The CW laser of claim 1 , wherein the gain medium is characterized as of Cr:ZnSe.4. The CW laser of claim 1 , wherein the gain medium is characterized as of Cr:ZnS.5. The CW laser of further comprising a foil positioned on a circumference.6. The CW laser of claim 5 , wherein the foil includes Indium.7. The CW laser of further comprising a heat sink positioned on a circumference.8. The CW laser of further comprising foil and heatsinks juxtaposed on the internal and external circumferences of the gain medium.9. The CW laser of further comprising a radiator positioned with respect to a heat sink to facilitate heat removal therefrom. This disclosure relates to continuous wave (CW) mid-IR solid state lasers. Particularly, the present invention provides a rotating disk and more preferably a ring comprised of chalcogenide gain media selected from II-VI group of polycrystalline materials doped with transition metal ions to provide un-precedented power generation with minimal thermal lensing.Middle-infrared (mid-IR) laser sources operating in the 2-10 μm spectral range are in great demand for a ...

Solid-state optical refrigerator for cryogenic cooling of payloads

A solid-state optical refrigerator for cryogenic cooling of a payload, the solid-state optical refrigerator including a laser cooling crystal including a first material and a dopant material; a thermal link including a second material, the thermal link being bonded to the laser cooling crystal and the thermal link being configured to be thermally linked to the payload to transfer heat conductively from the payload to the laser cooling crystal via the thermal link; and a vacuum chamber housing the laser cooling crystal and the thermal link, the vacuum chamber and thermal link having a combination of shape and coating such that laser and fluorescence light reflected off a wall of the vacuum chamber and laser and fluorescence light propagating within the thermal link are not incident on the payload.

Optical refrigerator using reflectivity tuned dielectric mirrors

Optical refrigerator using reflectivity-tuned dielectric mirrors. Selected working materials can be optically pumped using monochromatic radiation such that the resulting fluorescence has an average photon energy higher than that of the pumping radiation; that is, net anti-Stokes fluorescence. If the quantum efficiency is sufficiently high, the working material will cool and optical refrigeration can be achieved. Parallel mirrored faces are employed to increase the optical path of the incident pumping radiation within the working material by multiple reflections. Reflectivity-tuned dielectric mirrors which allow higher-energy fluorescence photons to readily escape from the working material while inhibiting the escape of the lower-energy photons which are consequently partially trapped in the working material and ultimately reabsorbed and refluoresced at higher energies are employed. This increases the optical refrigerator efficiency. An efficient geometry for the cooling material is a disk ...

Dual channel pumping method laser with metal vapor and noble gas medium

A laser pumping method pumps a primary amount of energy into the near red satellite band of a metal vapor and noble gas mixture laser medium and a lesser amount of energy is pumped into a highly excited level to stimulate laser output. The medium is can be a Rb vapor and Xe gas mixture. The lesser amount of energy is pumped into the laser medium to populate an excited level that lies above the upper laser level and transfers atomic or molecular population to the upper laser level by a nonradiative process. In preferred embodiments, the intermediate level is within a few kT of the upper laser level and the primary amount of energy is a large majority of the total energy. A laser device includes metal vapor and noble gas mixture laser medium to populate an intermediate level near an upper laser level, and pumping a lesser amount of energy into a highly excited level to stimulate laser output. The medium can be an Rb vapor and Xe gas mixture in preferred embodiments. A primary energy pump ...

LASER COOLING OF SILICA GLASS

A system, device, and method for laser cooling rare earth doped silica glass using anti-Stokes fluorescence is disclosed. The system includes a rare earth doped and codoped with one or more codopants silica glass; a laser that provides radiation to a first surface and through a body of the rare earth doped silica glass, wherein the laser is tuned from a first wavelength to a second wavelength; and a thermally sensitive device that captures images of the rare earth doped silica glass as the laser is tuned and determines a third wavelength between the first wavelength and the second wavelength where the rare earth doped silica glass is maximumly or near maximumly cooled.

Solar system, using solar energy method, for generating power

Solid-state laser refrigeration of composite optomechanical resonators

An apparatus and method of indirectly cooling an optomechanical resonator, comprising impinging a laser on an optomechanical resonator attached to a substrate, wherein the optomechanical resonator comprises a cantilever, a cooling end of the cantilever, having a cooling end comprising a laser-induced cooling element, an attachment end of the cantilever, attached to a substrate, and wherein the laser has a peak wavelength in the near-infrared band.

LASER MODULE

A laser module includes a Transmitter Optical Sub-Assembly (TOSA) and a heat radiating means. The TOSA generates light by an electrical signal and transmits the generated light through an optical fiber. The heat radiating means is in contact with the TOSA to discharge heat generated by the TOSA. 1. A laser module , comprising:a Transmitter Optical Sub-assembly (TOSA) configured to generate light by an electrical signal and transmit the generated light through an optical fiber; anda heat radiating means which is in contact with the TOSA to decrease heat generated by the TOSA.2. The laser module of claim 1 , wherein the TOSA includes:a Transistor Outline can (TO-CAN) optical module configured to emit light by the electrical signal;an optical fiber configured to transmit light emitted by the TO-CAN optical module; andan external housing configured to accommodate the TO-CAN optical module and one end of the optical fiber.3. The laser module of claim 2 , wherein the TO-CAN optical module includes:an electrode configured to receive the electrical signal;a laser diode configured to generate light based on the electrical signal input from the electrode;a sub mount configured to fix the laser diode;a fixing block configured to fix the sub mount;a platform configured to accommodate the fixing block and the electrode;a TO-CAN cylindrical block configured to cover the laser diode, the sub mount, and the fixing block on one surface of the platform; andan integrated lens positioned on an upper surface of the TO-CAN cylindrical block to allow light generated by the laser diode to pass through.4. The laser module of claim 1 , wherein the heat radiating means includes a heat sink formed to surround at least a part of the TOSA.5. The laser module of claim 4 , wherein the heat sink includes:a first heat sink block configured to cover one surface of the TOSA;a second heat sink block configured to cover the other surface of the TOSA; andat least one fixing screw engaged with the first ...

Dual channel pumping method laser with metal vapor and noble gas medium

A laser pumping method pumps a primary amount of energy into the near red satellite band of a metal vapor and noble gas mixture laser medium and a lesser amount of energy is pumped into a highly excited level to stimulate laser output. The medium is can be a Rb vapor and Xe gas mixture. The lesser amount of energy is pumped into the laser medium to populate an excited level that lies above the upper laser level and transfers atomic or molecular population to the upper laser level by a nonradiative process. In preferred embodiments, the intermediate level is within a few kT of the upper laser level and the primary amount of energy is a large majority of the total energy. A laser device includes metal vapor and noble gas mixture laser medium to populate an intermediate level near an upper laser level, and pumping a lesser amount of energy into a highly excited level to stimulate laser output. The medium can be an Rb vapor and Xe gas mixture in preferred embodiments. A primary energy pump pumps population in a near red satellite band. A second energy pump having substantially less energy than the primary energy pump pumps population to a highly excited level.

Dispositif de refroidissement localisé d'un organe

L'invention concerne un dispositif de refroidissement (1) localisé d'un organe, comportant : - Une tige (10) de forme allongée comportant une extrémité distale destinée à venir en contact avec un organe à refroidir et comportant : o Un élément de refroidissement (11) comportant un doigt froid (110), o Un cristal (13) à capacité de refroidissement par excitation à une longueur d'onde d'excitation déterminée, positionné de manière adjacente audit élément de refroidissement, o Un guide optique (15) apte à véhiculer un signal lumineux à ladite longueur d'onde d'excitation et débouchant sur ledit cristal (13), - Un système d'illumination (17) comportant au moins une source (S) de lumière agencée pour émettre ledit signal lumineux.

Solid-state laser apparatus for laser diode

본 발명은 레이저 다이오드용 고체 레이저 장치에 관한 것으로, 복수의 레이저 다이오드의 파장을 일정 차이값 간격을 갖도록 하거나 출력 세기를 일정 비율로 설정하여 온도 안정화 장치가 없어도 레이저의 출력 변동성을 안정시킬 수 있고 또한, 출력 변동성이 안정되어 저온에서도 정상동작이 가능함으로써 레이저가 발진하는데 걸리는 예열시간이 필요 없고, 온도 안정화 장치가 제거되어 중량과 부피를 감소시키는 레이저 다이오드용 고체 레이저 장치를 제공한다. The present invention relates to a solid-state laser device for a laser diode, the wavelength of the plurality of laser diodes having a predetermined difference value interval or by setting the output intensity at a constant ratio can stabilize the output variability of the laser even without a temperature stabilization device The present invention provides a solid-state laser device for a laser diode that does not require a preheating time for the laser to oscillate because the output variability is stable and can operate normally even at low temperatures.

Localised cooling device

L'invention concerne un dispositif de refroidissement localisé comprenant : - Un organe de refroidissement (13), - Un cristal (11) à capacité de refroidissement par absorption d'un signal lumineux d'excitation proche infrarouge, - Un système d'illumination (14) destiné à fournir un signal lumineux d'excitation, - Ledit cristal (11) comportant une forme allongée autour d'un axe longitudinal entre une extrémité proximale et une extrémité distale et présentant une section transversale externe constante fermée et un canal central réalisé à partir de son extrémité distale, sur au moins une partie de sa longueur, - Ledit organe de refroidissement (13) comportant une tige encastrée par une première extrémité dans ledit canal central dudit cristal et comportant une deuxième extrémité saillante formant un doigt de refroidissement (130). The invention relates to a localized cooling device comprising: - A cooling unit (13), - A crystal (11) with cooling capacity by absorption of a light signal of near infrared excitation, - An illumination system (14) intended to provide an excitation light signal, - Said crystal (11) having an elongated shape around a longitudinal axis between a proximal end and a distal end and having a closed constant external cross section and a central channel formed from its distal end, on at least part of its length, - Said cooling member (13) comprising a rod embedded by a first end in said central channel of said crystal and comprising a second projecting end forming a cooling finger (130).

便于降温的固体激光器

本申请涉及一种便于降温的固体激光器，其包括壳体以及固定设置在壳体内的风冷基板，风冷基板的一端与壳体的内壁之间形成散热风腔，激光器内的各电子元件均设置在风冷基板远离散热风腔的一侧，壳体的侧壁开设有与散热风腔连通的进风口，壳体远离进风口的侧壁开设有与散热风腔连通的出风口；进风口处设置有用于向散热风腔内吹风的风扇组，风冷基板靠近散热风腔的一端固定设置有若干散热鳍片，各散热鳍片之间形成供气体流通的气流风道，风冷基板远离散热风腔的一端开设有若干导热槽，导热槽内均设置有吸热管，吸热管与激光器内需要散热的电子元件抵接。本申请具有提高激光器内部的散热效果，进而使激光器具有良好的工作性能的效果。

高パワー連続波中赤外レーザー

本発明は、中赤外スペクトルにおける連続波レーザー発振について熱レンズ効果を最小にして前例のないパワー発生を与える回転カルコゲニド利得媒体リングを提供する。

Laser cooling of silica glass

A system, device, and method for laser cooling rare earth doped silica glass using anti-Stokes fluorescence is disclosed. The system includes a rare earth doped and codoped with one or more codopants silica glass; a laser that provides radiation to a first surface and through a body of the rare earth doped silica glass, wherein the laser is tuned from a first wavelength to a second wavelength; and a thermally sensitive device that captures images of the rare earth doped silica glass as the laser is tuned and determines a third wavelength between the first wavelength and the second wavelength where the rare earth doped silica glass is maximumly or near maximumly cooled.

一种利用激光冷却的高稳定光谱合成方法和装置

本发明公开了一种利用激光冷却的高稳定光谱合成方法和装置，所述装置包括光谱合成元件（1）、光束耦合装置（2）、冷却激光（3）和待合成激光（4），光谱合成元件（1）或光束耦合装置（2）为掺杂稀土元素固体材料作为基底制作的光学元件，元件通过冷却激光（3）照射至各使用可产生反斯托克斯冷却现象的掺稀土元素固体材料作为基底制作的元件上，使其产生激光冷却效果，控制掺稀土元素固体材料作为基底制作的光学元件的温度梯度，以实现良好的光谱合成效果；所述一种利用激光冷却的高稳定光谱合成装置的使用方法包括待合成激光（4）的光谱合成以及冷却激光（3）与掺稀土元素固体材料发生冷却效应。

High power cw mid-ir laser

The present invention provides a rotating chalcogenide gain media ring to provide unprecedented power generation with minimal thermal lensing for CW lasing in the mid-IR spectrum.

便于降温的固体激光器

本申请涉及一种便于降温的固体激光器，其包括壳体以及固定设置在壳体内的风冷基板，风冷基板的一端与壳体的内壁之间形成散热风腔，激光器内的各电子元件均设置在风冷基板远离散热风腔的一侧，壳体的侧壁开设有与散热风腔连通的进风口，壳体远离进风口的侧壁开设有与散热风腔连通的出风口；进风口处设置有用于向散热风腔内吹风的风扇组，风冷基板靠近散热风腔的一端固定设置有若干散热鳍片，各散热鳍片之间形成供气体流通的气流风道，风冷基板远离散热风腔的一端开设有若干导热槽，导热槽内均设置有吸热管，吸热管与激光器内需要散热的电子元件抵接。本申请具有提高激光器内部的散热效果，进而使激光器具有良好的工作性能的效果。

Laser design

A laser gain element including an undoped layer of a monoclinic double tungstate (MDT) crystal, and a method of forming a laser gain element are provided. The laser gain element includes a layer of doped MDT crystal adjacent to the undoped layer, the doped MDT layer including a pre-selected concentration of rare earth ions. The layer of doped MDT crystal has an absorption peak at a first wavelength and an emission peak at a second wavelength longer than the first wavelength; and the layer of doped MDT crystal has a fluorescence emission with a weighted average at a third wavelength shorter than the first wavelength. A laser resonator cavity formed with a plurality of composite gain elements as above is also provided.

一种利用激光冷却的高稳定光谱合成方法和装置

本发明公开了一种利用激光冷却的高稳定光谱合成方法和装置，所述装置包括光谱合成元件（1）、光束耦合装置（2）、冷却激光（3）和待合成激光（4），光谱合成元件（1）或光束耦合装置（2）为掺杂稀土元素固体材料作为基底制作的光学元件，元件通过冷却激光（3）照射至各使用可产生反斯托克斯冷却现象的掺稀土元素固体材料作为基底制作的元件上，使其产生激光冷却效果，控制掺稀土元素固体材料作为基底制作的光学元件的温度梯度，以实现良好的光谱合成效果；所述一种利用激光冷却的高稳定光谱合成装置的使用方法包括待合成激光（4）的光谱合成以及冷却激光（3）与掺稀土元素固体材料发生冷却效应。

High power cw mid-ir laser

The present invention provides a rotating chalcogenide gain media ring to provide unprecedented power generation with minimal thermal lensing for CW lasing in the mid-IR spectrum.

Solid-state laser refrigeration of composite optomechanical resonators

An apparatus and method of indirectly cooling an optomechanical resonator, comprising impinging a laser on an optomechanical resonator attached to a substrate, wherein the optomechanical resonator comprises a cantilever, a cooling end of the cantilever, having a cooling end comprising a laser-induced cooling element, an attachment end of the cantilever, attached to a substrate, and wherein the laser has a peak wavelength in the near-infrared band.

Laser design

A laser gain element including an undoped layer of a monoclinic double tungstate (MDT) crystal, and a method of forming a laser gain element are provided. The laser gain element includes a layer of doped MDT crystal adjacent to the undoped layer, the doped MDT layer including a pre-selected concentration of rare earth ions. The layer of doped MDT crystal has an absorption peak at a first wavelength and an emission peak at a second wavelength longer than the first wavelength; and the layer of doped MDT crystal has a fluorescence emission with a weighted average at a third wavelength shorter than the first wavelength. A laser resonator cavity formed with a plurality of composite gain elements as above is also provided.

Energy conversion system

A method of emitting photons at a desired wavelength, including: providing a material having a first region of high absorption of radiation at a first set of wavelength of radiation, contiguous with a second region of low absorption of radiation at a shorter set of wavelengths, and a third region of high emission at a further shorter set of wavelengths; applying energy to the material at the first region, such that most of an effective black body radiation of said material at a temperature of the material would fall within the second region and be configured to transfer energy to said third region and not overlap with the first region; and emitting energy from the material at the third region, powered by said applying energy.

Radiation-balanced fiber laser

An apparatus and method for cooling an optical fiber, comprising impinging electromagnetic radiation from a laser on an optical fiber comprising a core, in which the electromagnetic radiation is substantially confined, and a cladding, in thermal communication with the core, configured to provide optically activated cooling of the core via the electromagnetic radiation from the laser.

一种星载大功率激光器温控系统及控制方法

一种星载大功率激光器温控系统及控制方法，属于航天热控技术领域，有效实现星载大功率激光器的高精度控温，并有效降低散热面面积和热补偿功耗；同时该系统可以实现热开关的功能，保证激光器开机时热量向辐射冷凝器传递以及激光器关机时冷量不进入到激光器中；采用该控制策略可以快速实现工质相变，保证进入到激光器冷板处较高的换热效率以及大幅降低机械泵在轨运行时长，提升系统可靠性。

一种利用激光冷却的高稳定光谱合成方法和装置

本发明公开了一种利用激光冷却的高稳定光谱合成方法和装置，所述装置包括光谱合成元件（1）、光束耦合装置（2）、冷却激光（3）和待合成激光（4），光谱合成元件（1）或光束耦合装置（2）为掺杂稀土元素固体材料作为基底制作的光学元件，元件通过冷却激光（3）照射至各使用可产生反斯托克斯冷却现象的掺稀土元素固体材料作为基底制作的元件上，使其产生激光冷却效果，控制掺稀土元素固体材料作为基底制作的光学元件的温度梯度，以实现良好的光谱合成效果；所述一种利用激光冷却的高稳定光谱合成装置的使用方法包括待合成激光（4）的光谱合成以及冷却激光（3）与掺稀土元素固体材料发生冷却效应。

便于降温的固体激光器

本申请涉及一种便于降温的固体激光器，其包括壳体以及固定设置在壳体内的风冷基板，风冷基板的一端与壳体的内壁之间形成散热风腔，激光器内的各电子元件均设置在风冷基板远离散热风腔的一侧，壳体的侧壁开设有与散热风腔连通的进风口，壳体远离进风口的侧壁开设有与散热风腔连通的出风口；进风口处设置有用于向散热风腔内吹风的风扇组，风冷基板靠近散热风腔的一端固定设置有若干散热鳍片，各散热鳍片之间形成供气体流通的气流风道，风冷基板远离散热风腔的一端开设有若干导热槽，导热槽内均设置有吸热管，吸热管与激光器内需要散热的电子元件抵接。本申请具有提高激光器内部的散热效果，进而使激光器具有良好的工作性能的效果。

一种星载大功率激光器温控系统及控制方法

一种星载大功率激光器温控系统及控制方法，属于航天热控技术领域，有效实现星载大功率激光器的高精度控温，并有效降低散热面面积和热补偿功耗；同时该系统可以实现热开关的功能，保证激光器开机时热量向辐射冷凝器传递以及激光器关机时冷量不进入到激光器中；采用该控制策略可以快速实现工质相变，保证进入到激光器冷板处较高的换热效率以及大幅降低机械泵在轨运行时长，提升系统可靠性。

太阳能系统、使用太阳能的方法、用于发电的方法和设备

本申请涉及太阳能系统、使用太阳能的方法、用于发电的方法和设备。一种以所希望的波长发射光子的方法，包括：提供一种材料，该材料具有在第一组辐射波长的高辐射吸收的第一区，第一区与在较短波长组的低辐射吸收的第二区相邻，以及在更短波长组高发射的第三区；在第一区处对上述材料施加能量，使得在上述材料的某一温度所述材料的大部分的有效黑体辐射将落在第二区内并被配置为将能量转移到所述第三区且不与第一区重叠；以及从通过所述施加能量而被提供能量的第三区的材料发射能量。