CN111403999B - Laser amplification device capable of realizing laser output of high-power structure light field and laser - Google Patents

Laser amplification device capable of realizing laser output of high-power structure light field and laser Download PDF

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Publication number
CN111403999B
CN111403999B CN202010156248.2A CN202010156248A CN111403999B CN 111403999 B CN111403999 B CN 111403999B CN 202010156248 A CN202010156248 A CN 202010156248A CN 111403999 B CN111403999 B CN 111403999B
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laser
gain
light
module
power
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CN111403999A (en
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易家玉
胡浩
阮旭
涂波
曹海霞
高清松
唐淳
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Institute of Applied Electronics of CAEP
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Institute of Applied Electronics of CAEP
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02—Constructional details
    • H01S3/04—Arrangements for thermal management
    • H01S3/0407—Liquid cooling, e.g. by water
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02—Constructional details
    • H01S3/04—Arrangements for thermal management
    • H01S3/042—Arrangements for thermal management for solid state lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094061—Shared pump, i.e. pump light of a single pump source is used to pump plural gain media in parallel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers

Abstract

The invention discloses a laser amplification device capable of realizing laser output of a high-power structure light field and a laser. The laser comprises a direct liquid cooling array distributed gain module, a structured light seed light source, a 4f light beam amplification system and a pumping system. Aiming at the defect that the quality of light beams of the direct liquid-cooled array laser is poor due to the flowing of liquid, the invention innovatively provides the method that the structural light field which can be highly anti-interference is injected to be used as a seed source, and the structural light field laser output with high power and high light beam quality is obtained through the amplification of the large-caliber circular liquid-cooled laser gain module. The amplifier and the laser can not only improve the beam quality of the direct liquid-cooled laser device, but also obtain the high-power structured light field laser which plays an important role in atmospheric transmission, precision measurement and the like, and are a novel high-power laser device.

Description

Laser amplification device capable of realizing laser output of high-power structure light field and laser
Technical Field
The invention relates to the technical field of high-energy laser, in particular to a laser amplification device and a laser capable of realizing laser output of a high-power structured light field.
Background
The spatial structure light field has a wide research prospect in the fields of precision measurement, super-resolution imaging, large-capacity optical communication, long-distance anti-interference laser transmission and the like by virtue of the special phase and polarization state distribution characteristics of the spatial structure light field, and becomes a research hotspot in the optical field. Common methods for generating a spatial structure light field include using a spatial light modulator, a spiral phase plate, a Q plate, a silicon-based photonic device, a micro-nano metal structure, and the like, and these methods can realize various types of structure light fields, such as a vortex light field with spiral phase distribution, a bessel light field with non-diffraction transmission characteristics, and the like. However, these methods are not only complicated but also fail to obtain high power structured light field lasers.
On the other hand, the high average power all-solid-state laser plays an important role in the fields of forward scientific research, national economy, national safety and the like, and is a research hotspot and an important direction in the laser field. The severe thermal effects caused by the increase in laser power are the core problem limiting all-solid-state lasers to achieve high average power, high beam quality laser output. Direct liquid cooling is an effective heat management mode, and under the support of the high-efficiency heat management, a plurality of gain media can be arranged in an array mode to achieve distributed gain. The gain mode has the advantages that the heat generation rate of the monolithic gain medium is reduced, meanwhile, extremely high gain can be obtained in unit volume, and the compactness and the miniaturization of the laser are realized. US7366211B2 discloses a liquid direct cooling laser, and the laser device is a high-flux pumping mode that a plurality of pieces of media are placed in liquid to realize laser output, which is a new laser design idea. However, in such a laser, the inevitable jitter of the liquid flow has a significant effect on the beam quality of the output laser light, since the flowing liquid affects the laser light transmission.
Therefore, if the space structure light field capable of realizing long-distance anti-interference laser transmission is combined with the direct liquid cooling array distributed laser gain module, the problem that the beam quality of the direct liquid cooling laser is influenced by liquid flow can be solved, and meanwhile, high-power structure light field laser can be obtained.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the laser amplification device and the laser capable of realizing the laser output of the high-power structure light field are provided, so that the laser output of the high-power structure light field is obtained while the beam quality of the direct liquid cooling laser is improved.
The technical scheme adopted by the invention is as follows:
the utility model provides a can realize high power structure light field laser output's laser amplification device, laser amplification device includes direct liquid cooling array gain module, pumping system and 4f beam amplification system, wherein:
the pumping system is used for injecting pumping light to the gain module.
The gain module generates laser gain under the excitation of the pump light.
The 4f light beam amplification system is used for carrying out phase transmission and beam expansion processing on low-power seed laser output by the structured light seed light source, and the processed laser is injected into the gain module.
The working principle of the laser amplifier of the invention is as follows: the pump system injects pump light into the gain block, which produces laser gain. The 4f light beam amplification system expands the seed light input by the structured light seed light source, injects the expanded light beam into the gain module from the input end of the gain module for gain amplification, and the gain module outputs the light beam after gain amplification from the output end. The laser amplifier adopts the direct liquid cooling array type laser gain module with large gain caliber, the heat generation density of the crystal is low, effective heat management can be realized, and multi-pass amplification can be realized by utilizing a single gain module. The anti-interference transmission characteristic of the structural light field laser is utilized to improve the beam quality of the direct liquid cooling laser and obtain the high-power structural light field laser at the same time.
Furthermore, the pumping system is composed of at least one set of pumping coupling system, the pumping coupling system comprises a pumping light source and a two-color spectroscope which are matched with each other, the two-color spectroscope reflects pumping light and transmits laser, and the two-color spectroscope reflects the pumping light output by the pumping light source into the gain module through the light-transmitting window.
By the design of the two-color spectroscope, the pumping light and the laser can be input into the gain module in a common path, and the laser is not influenced by a pumping system.
Furthermore, two sets of pumping coupling systems are respectively arranged at two sides of the gain module. And the double-end pumping mode is adopted, so that the uniformity of excitation of the gain medium can be improved, and the gain power is improved.
Further, the pumping light source is one of a diode stack array, an optical fiber pumping source and a flash lamp pumping source.
Furthermore, the gain module comprises a plurality of thin-sheet gain media and laser cooling liquid; the gain media are arranged in an array mode, a micro-channel is formed between every two adjacent gain media, and laser cooling liquid flows through the micro-channel. The cooling liquid flows through the gain medium to take away heat, so that the gain medium is cooled, the heat load of the gain module is reduced, and good heat management is realized.
Furthermore, each gain medium of the gain module further comprises a crystal fixing strip, a flow channel separation strip, a module inner frame, a module outer frame and a light through window, the gain media are fixedly stacked in the module inner frame through the crystal fixing strip, and are separated by the flow channel separation strip between adjacent gain media to form a micro flow channel, the module inner frame is fixed in the module outer frame, a gap exists between the module inner frame and the outer frame, and the light through windows are arranged on two opposite sides of the module outer frame.
The structure of the gain module adopts a mode of separating the inner frame from the outer frame, so that the crosstalk of a cooling liquid flow field can be effectively prevented, and the realization of a high-uniformity flow field in a gain area is ensured.
Furthermore, the gain medium is bonded by a dissipation section crystal, a gain section crystal and a recovery section crystal; the dissipation section crystal and the recovery section crystal are undoped or non-gain crystals different from gain section crystal doped ions, and the gain section crystal is doped with the gain crystal. The dissipation section crystal area dissipates turbulent cooling liquid, changes the turbulent flow into laminar flow, ensures the speed uniformity of the cooling liquid reaching the gain section crystal area in the spanwise direction, and realizes the uniform cooling of the gain medium.
Further, the shape of the gain section crystal is circular. A circular gain medium (gain region) can be matched to most of the structured light field (e.g., vortex beam, etc.).
In order to solve the above problems, the present invention further provides a laser capable of realizing laser output of a high power structured light field, which includes a structured light seed light source and the above laser amplifying device capable of realizing laser output of a high power structured light field; the structured light seed light source outputs low-power structured light field seed laser; the laser amplification device capable of realizing the laser output of the high-power structure light field is arranged on the light path of the seed laser.
Further, the structured light seed light source generates seed laser by using one of a method based on free space coupling, a method based on a mechanical microbend grating structure, a method based on acoustic-to-fiber grating, a method based on fiber end face microstructure and a method based on chiral fiber grating.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the laser amplifier and the laser of the invention utilize the anti-interference transmission characteristic of the structural light field laser to improve the beam quality of the direct liquid cooling laser and obtain the structural light field laser with high power and high quality.
2. The laser amplifier and the laser adopt the direct liquid cooling array type sheet gain module with large gain caliber, the heat generation density of the crystal is low, and effective heat management can be realized. Meanwhile, the light transmission caliber is large, so that a complex 4f phase transmission system can be avoided, and multi-pass amplification can be realized by using a single gain module.
3. The laser amplifier and the laser have the advantages of small volume, light weight and high reliability.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is an embodiment of a laser based on a direct liquid-cooled array distributed gain module that can achieve high power structured optical field laser output.
Fig. 2 is a block diagram of a direct liquid-cooled array distributed gain module.
Fig. 3 is a structural diagram of a gain medium.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example one
Referring to fig. 1, this embodiment discloses a laser amplifier device capable of realizing laser output in a high-power structured light field, which is based on a direct liquid-cooling array gain module. The laser amplification device comprises a direct liquid cooling array type gain module 1 (hereinafter referred to as a gain module), a pumping system and a 4f light beam amplification system. The structure and function of each system are as follows:
a pumping system: and is used for injecting pump light D4 into the gain module 1 to realize population inversion to obtain laser gain.
A gain module: for generating laser gain upon excitation by the pump light D4. The core structure is that a plurality of gain media are arranged in an array mode, a micro-channel is formed between adjacent gain media, laser cooling liquid flows through the micro-channel to take away heat of the gain media, and cooling of the gain media is achieved. And a light-transmitting window arranged corresponding to the gain medium transmits laser into the module cavity, the gain medium performs gain amplification on the transmitted laser, and the amplified laser is output from the gain module through another light-transmitting window.
4f beam amplification system: the low-power seed laser processing device is used for carrying out phase transmission and beam expansion processing on low-power seed laser output by the structured light seed light source, and the processed laser is injected into the gain module 1.
The working principle of the laser amplification device is as follows: the pump system injects pump light D4 into the gain block, which produces laser gain. The 4f light beam amplification system expands the seed light input by the structured light seed light source, injects the expanded light beam D2 into the gain module 1 from the input end of the gain module 1 for gain amplification, and the gain module 1 outputs the gain-amplified light beam D3 from the output end.
Example two
Referring to fig. 1, this embodiment discloses a laser capable of realizing laser output in a high power structure light field, which is based on a direct liquid cooling array gain module. The laser comprises a direct liquid cooling array type gain module 1 (hereinafter referred to as a gain module), a pumping system, a structured light seed light source 2 and a 4f light beam amplification system. The structure and function of each system are as follows:
a pumping system: and is used for injecting pump light D4 into the gain module 1 to realize population inversion to obtain laser gain.
A gain module: for generating laser gain upon excitation by the pump light D4. The core structure is that a plurality of gain media are arranged in an array mode, a micro-channel is formed between adjacent gain media, laser cooling liquid flows through the micro-channel to take away heat of the gain media, and cooling of the gain media is achieved. And a light-transmitting window arranged corresponding to the gain medium transmits laser into the module cavity, the gain medium performs gain amplification on the transmitted laser, and the amplified laser is output from the gain module through another light-transmitting window.
Structured light seed light source: for 2 is used to inject low power seed light D1 into the gain block. The seed light source 2 is an optical fiber light source capable of outputting a structural light field, and can generate various spatial structure light fields by using methods based on free space coupling, mechanical microbend grating structure, acoustic-to-optical fiber grating, optical fiber end face microstructure, chiral optical fiber grating and the like.
4f beam amplification system: and the low-power seed laser is arranged between the seed light source 2 and the gain module 1 and used for carrying out phase transmission and beam expansion treatment on the low-power seed laser output by the structured light seed light source, and the treated laser is injected into the gain module 1.
The working principle of the laser is as follows: the pumping system injects pumping light D4 into the gain block 1, and the gain block 1 generates laser gain. The structural light field seed light D1 output by the seed light source 2 passes through the 4f light beam amplification system and is expanded, the expanded light beam D2 enters the gain module 1 for gain amplification, and the gain-amplified light beam D3 is output from the output end of the gain module 1, namely the high-power structural light field laser is obtained.
EXAMPLE III
As shown in fig. 2, the present embodiment discloses the structure of the gain module 1. The gain module 1 comprises a plurality of thin-sheet gain media, the gain media are arranged in an array mode and fixedly stacked in a module inner frame 15 through fixing strips 11, the module inner frame 15 is fixed in a module outer frame 8 and has a gap with the module outer frame 8, the module outer frame 8 is provided with a light-transmitting window 9 for transmitting laser D2 and pump light D4, laser cooling liquid 16 flows into an inner cavity of the gain module through a diversion cone 7, the gain media are separated into flat micro-channels by flow channel separating strips 17, and the laser cooling liquid 16 flows into the micro-channels and gaps between the inner frame and the outer frame, so that cooling of a gain crystal and the light-transmitting window 9 is realized. The gain module 1 is designed to be an inner frame and outer frame separation structure, the module inner frame 15 is used for fixing a gain medium, the module outer frame 8 is used for fixing the module inner frame 15 and the light through window 9, the crosstalk of a laser cooling liquid 16 flow field is effectively prevented, and the realization of a high uniform flow field in a gain area is ensured.
As shown in fig. 3, the gain medium is a composite crystal formed by bonding a dissipation section crystal 4, a gain section crystal 13 and a recovery section crystal 12. Thus, in the micro-channel, the laser cooling liquid 16 firstly flows through the crystal 4 region of the dissipation section to dissipate turbulent flow, the turbulent flow is changed into laminar flow, the speed uniformity of the liquid reaching the crystal 13 of the gain section in the spreading direction is ensured, and the uniform cooling of the composite crystal is realized. The dissipation section crystal 4 and the recovery section crystal 12 belong to a non-gain crystal which is not doped or doped with ions different from those of the gain section crystal 13, and the gain section crystal 13 is used for generating laser gain and is a doped crystal (doped gain material). In one embodiment, the gain section crystal 13 is an isotropic laser crystal such as Nd: YAG, which has no special selection characteristics for the polarization state of the pump laser light, and can improve the output efficiency.
In one embodiment, as shown in fig. 3, the gain section crystal 13 is designed to be circular, and the circular gain medium can be matched with most of the structure optical field (such as vortex beam).
The refractive index of the laser coolant 16 of the present embodiment is matched to the gain medium. The absorption of the laser light D2 and the pump light D4 is weak, and the cooling effect on the gain medium is good.
Example four
The present embodiment discloses the structure of a pumping system. Referring to the attached drawing 1, the pumping system includes at least one set of pumping coupling system, the pumping coupling system includes a pumping light source 6 and a two-color spectroscope 5 which are matched with each other, the two-color spectroscope 5 reflects pumping light D4 and transmits laser light D2, the two-color spectroscope 5 reflects the pumping light D4 output by the pumping light source 6 into the gain module 1 through the light-transmitting window 9, and a large-area end pumping mode is adopted. The pumping light source 6 may be one of a diode stack, a fiber pumping source, and a flash lamp pumping source. As shown in fig. 1, in one embodiment, two sets of pump coupling systems are respectively disposed on two sides of the gain module 1.
EXAMPLE five
The present embodiment discloses the structure of a 4f beam amplifying system. The 4f beam magnifying system is composed of a front end lens 3 and a rear end lens 4, and the front end lens 3 and the rear end lens 4 are confocal. As shown in fig. 1, in one embodiment, the front lens 3 and the rear lens 4 are both convex lenses, with the focal point between the two lenses 3, 4.
EXAMPLE six
The embodiment discloses a laser amplification device capable of realizing laser output of a high-power structure light field, which is based on a direct liquid cooling array type gain module. The laser amplification device comprises a direct liquid cooling array type gain module 1 (hereinafter referred to as a gain module), a pumping system and a 4f light beam amplification system. The structure of each system is as follows:
as shown in fig. 2, the gain module 1 includes a plurality of thin-sheet gain media, each gain medium is arranged in an array, and is fixedly stacked in a module inner frame 15 through a fixing strip 11, the module inner frame 15 is fixed in a module outer frame 8, and has a gap with the module outer frame 8, the module outer frame 8 is provided with a light-transmitting window 9 for transmitting laser D2 and pump light D4, laser cooling liquid 16 flows into an inner cavity of the gain module through a flow guide cone 7, the gain media are separated by flow channel separation strips 17 to form a flat micro-channel, and the laser cooling liquid 16 flows into the micro-channel and gaps between the inner frame and the outer frame, so as to cool the gain crystal and the light-transmitting window 9. The gain module 1 is designed to be an inner frame and outer frame separation structure, the module inner frame 15 is used for fixing a gain medium, the module outer frame 8 is used for fixing the module inner frame 15 and the light through window 9, the crosstalk of a laser cooling liquid 16 flow field is effectively prevented, and the realization of a high uniform flow field in a gain area is ensured.
As shown in fig. 3, the gain medium is a composite crystal formed by bonding a dissipation section crystal 4, a gain section crystal 13 and a recovery section crystal 12. The gain section crystal 13 is circular. Thus, in the micro-channel, the laser cooling liquid 16 firstly flows through the crystal 4 region of the dissipation section to dissipate turbulent flow, the turbulent flow is changed into laminar flow, the speed uniformity of the liquid reaching the crystal 13 of the gain section in the spreading direction is ensured, and the uniform cooling of the composite crystal is realized. The crystals 4 and 12 in the dissipation section and the gain section belong to non-gain crystals which are not doped or doped with ions different from those of the crystals 13 in the gain section, the crystals 13 in the gain section are used for generating laser gain and are doped crystals (doped gain materials), for example, the crystals 13 in the gain section are Nd: YAG.
As shown in fig. 1, the pumping system includes two sets of pumping coupling systems, and the two sets of pumping coupling systems are respectively disposed on two sides of the gain module 1 to perform double-end pumping. The pumping coupling system comprises a pumping light source 6 and a two-color spectroscope 5 which are matched with each other, the two-color spectroscope 5 reflects pumping light D4 and transmits laser light D2, the two-color spectroscope 5 reflects the pumping light D4 output by the pumping light source 6 into the gain module 1 through the light-transmitting window 9, and a large-area end pumping mode is adopted. The pumping light source 6 may be one of a diode stack, a fiber pumping source, and a flash lamp pumping source.
As shown in fig. 1, the 4f beam magnifying system is disposed between the structured light seed light source and the light transmission window 9, and is composed of a front lens 3 and a rear lens 4, and the front lens 3 and the rear lens 4 are confocal. The front lens 3 and the back lens 4 may be confocal convex lenses with the focus between the two lenses.
EXAMPLE seven
The embodiment discloses a laser capable of realizing high-power structured light field laser output, which comprises a direct liquid cooling array type gain module 1 (hereinafter referred to as a gain module), a pumping system, a structured light seed light source and a 4f light beam amplification system. The structure of each system is as follows:
as shown in fig. 2, the gain module 1 includes a plurality of thin-sheet gain media, each gain medium is arranged in an array, and is fixedly stacked in a module inner frame 15 through a fixing strip 11, the module inner frame 15 is fixed in a module outer frame 8, and has a gap with the module outer frame 8, the module outer frame 8 is provided with a light-transmitting window 9 for transmitting laser D2 and pump light D4, laser cooling liquid 16 flows into an inner cavity of the gain module through a flow guide cone 7, the gain media are separated by flow channel separation strips 17 to form a flat micro-channel, and the laser cooling liquid 16 flows into the micro-channel and gaps between the inner frame and the outer frame, so as to cool the gain crystal and the light-transmitting window 9. The gain module 1 is designed to be an inner frame and outer frame separation structure, the module inner frame 15 is used for fixing a gain medium, the module outer frame 8 is used for fixing the module inner frame 15 and the light through window 9, the crosstalk of a laser cooling liquid 16 flow field is effectively prevented, and the realization of a high uniform flow field in a gain area is ensured.
As shown in fig. 3, the gain medium is a composite crystal formed by bonding a dissipation section crystal 4, a gain section crystal 13 and a recovery section crystal 12. The gain section crystal 13 is circular. Thus, in the micro-channel, the laser cooling liquid 16 firstly flows through the crystal 4 region of the dissipation section to dissipate turbulent flow, the turbulent flow is changed into laminar flow, the speed uniformity of the liquid reaching the crystal 13 of the gain section in the spreading direction is ensured, and the uniform cooling of the composite crystal is realized. The crystals 4 and 12 in the dissipation section and the gain section belong to non-gain crystals which are not doped or doped with ions different from those of the crystals 13 in the gain section, the crystals 13 in the gain section are used for generating laser gain and are doped crystals (doped gain materials), for example, the crystals 13 in the gain section are Nd: YAG.
As shown in fig. 1, the pumping system includes two sets of pumping coupling systems, and the two sets of pumping coupling systems are respectively disposed on two sides of the gain module 1 to perform double-end pumping. The pumping coupling system comprises a pumping light source 6 and a two-color spectroscope 5 which are matched with each other, the two-color spectroscope 5 reflects pumping light D4 and transmits laser light D2, the two-color spectroscope 5 reflects the pumping light D4 output by the pumping light source 6 into the gain module 1 through the light-transmitting window 9, and a large-area end pumping mode is adopted. The pumping light source 6 may be one of a diode stack, a fiber pumping source, and a flash lamp pumping source.
The structured light seed light source 2 is used to inject low power seed light D1 into the gain block. The seed light source 2 is an optical fiber light source capable of outputting a structural light field, and can generate various spatial structure light fields by using methods based on free space coupling, mechanical microbend grating structure, acoustic-to-optical fiber grating, optical fiber end face microstructure, chiral optical fiber grating and the like.
As shown in fig. 1, the 4f beam magnifying system is disposed between the structured light seed light source 2 and the light transmission window 9, and is composed of a front lens 3 and a rear lens 4, and the front lens 3 and the rear lens 4 are confocal. The front lens 3 and the back lens 4 may be confocal convex lenses with the focus between the two lenses.
The working principle of the laser is as follows: the pumping light source 6 reflects and injects pumping light D4 from the two ends of the gain module 1 into the gain module 1 through the dichroic beam splitter 5, and laser gain is generated in the gain module 1. The structural light field seed light D1 output by the seed light source 2 passes through an amplification system composed of a front-end lens 3 and a rear-end lens 4 to be expanded, the expanded light beam D2 is transmitted by a two-color spectroscope 5 to enter a gain module 1 to be amplified, and the laser gain-amplified light beam D3 is transmitted by the other two-color spectroscope 5 to be output, so that the high-power structural light field laser is obtained.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims (8)

1. The utility model provides a can realize laser amplification device of high power structure light field laser output which characterized in that, laser amplification device includes direct liquid cooling array gain module (1), pumping system and 4f beam amplification system, wherein:
the pumping system is used for injecting pumping light (D4) into the gain module (1);
the gain module (1) generates laser gain under the excitation of the pump light (D4); the gain module (1) comprises a plurality of thin-sheet gain media and laser cooling liquid (16); the gain media are arranged in an array manner, a micro-channel is formed between adjacent gain media, and laser cooling liquid (16) flows through the micro-channel; the gain module (1) further comprises a crystal fixing strip (11), a flow channel partition strip (17), a module inner frame (15), a module outer frame (8) and a light-through window (9), wherein gain media are fixedly stacked in the module inner frame (15) through the crystal fixing strip (11), adjacent gain media are separated through the flow channel partition strip (17) to form a micro flow channel, the module inner frame (15) is fixed in the module outer frame (8), a gap exists between the module inner frame (15) and the outer frame (8), and the light-through windows (9) are arranged on two opposite sides of the module outer frame (8);
the 4f light beam amplification system is used for carrying out phase transmission and beam expansion processing on low-power seed laser output by the structured light seed light source, and the processed laser is injected into the gain module (1).
2. The laser amplification device capable of achieving the laser output of the high-power structured light field according to claim 1, wherein the pump system is composed of at least one set of pump coupling system, the pump coupling system includes a pump light source (6) and a dichroic beam splitter (5) that are matched with each other, the dichroic beam splitter (5) reflects the pump light (D4) and transmits the laser light (D2), and the dichroic beam splitter (5) reflects the pump light (D4) output by the pump light source (6) into the gain module (1) through the light-transmitting window (9).
3. The laser amplification device capable of achieving laser output in a high-power structured light field according to claim 2, wherein two sets of pump coupling systems are respectively disposed on two sides of the gain module (1).
4. The laser amplification device capable of realizing the laser output of the high-power structured light field according to claim 2 or 3, wherein the pump light source (6) is one of a diode stack, a fiber pump source and a flash lamp pump source.
5. The laser amplification device capable of realizing high-power structured light field laser output according to claim 1, wherein the gain medium is bonded by a dissipation section crystal (14), a gain section crystal (13) and a recovery section crystal (12); the dissipation section crystal (14) and the recovery section crystal (12) are undoped or non-gain crystals different from the gain section crystal (13) in doped ions, and the gain section crystal (13) is doped with a gain crystal.
6. The laser amplification device capable of realizing high-power structured-light-field laser output according to claim 5, wherein the shape of the gain section crystal (13) is circular.
7. A laser capable of realizing laser output of a high-power structured light field is characterized by comprising a structured light seed light source (2) and a laser amplifying device capable of realizing laser output of a high-power structured light field according to any one of claims 1 to 6; the structured light seed light source (2) outputs a low-power structured light field seed laser (D1); the laser amplification device capable of realizing the light field laser output of the high-power structure is arranged on the light path of the seed laser (D1).
8. The laser capable of realizing high-power structured light field laser output according to claim 7, wherein the structured light seed light source (2) generates seed laser light (D1) by using one of free space coupling based, mechanical microbend grating based, acoustic fiber grating based, fiber end face microstructure based and chiral fiber grating based.
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