CN114824998B - High-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device - Google Patents

High-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device Download PDF

Info

Publication number
CN114824998B
CN114824998B CN202210754007.7A CN202210754007A CN114824998B CN 114824998 B CN114824998 B CN 114824998B CN 202210754007 A CN202210754007 A CN 202210754007A CN 114824998 B CN114824998 B CN 114824998B
Authority
CN
China
Prior art keywords
gain
laser
gain medium
special
shaped light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210754007.7A
Other languages
Chinese (zh)
Other versions
CN114824998A (en
Inventor
唐淳
易家玉
阮旭
胡浩
涂波
高清松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institute of Applied Electronics of CAEP
Original Assignee
Institute of Applied Electronics of CAEP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Institute of Applied Electronics of CAEP filed Critical Institute of Applied Electronics of CAEP
Priority to CN202210754007.7A priority Critical patent/CN114824998B/en
Publication of CN114824998A publication Critical patent/CN114824998A/en
Application granted granted Critical
Publication of CN114824998B publication Critical patent/CN114824998B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
    • 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
    • H01S3/025—Constructional details of solid state lasers, e.g. housings or mountings
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/163—Solid materials characterised by a crystal matrix
    • H01S3/164—Solid materials characterised by a crystal matrix garnet
    • H01S3/1643—YAG
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/163—Solid materials characterised by a crystal matrix
    • H01S3/1645—Solid materials characterised by a crystal matrix halide
    • H01S3/1653—YLiF4(YLF, LYF)

Abstract

The invention discloses a high-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device, and relates to the technical field of high-energy laser. The device comprises: the gain module consists of a plurality of gain media and a cooling liquid flow channel between the gain media, and the subarea coated wafer and the special-shaped light-transmitting window are positioned at two sides of the gain module. The direct liquid cooling laser gain device adopts a plurality of gain media which are arranged in an array mode, and can obtain higher laser gain in unit volume while reducing single-chip heat load through heat dissipation of flowing laser liquid, and can realize pupil offset self-compensation of laser while reducing Fresnel reflection by adopting Brewster angle incidence through reasonably setting angles and arrangement modes of the special-shaped light-passing window and the gain media, thereby increasing overlapping efficiency, and having the advantages of excellent heat management mode, good output laser beam quality and the like.

Description

High-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device
Technical Field
The invention relates to the technical field of high-energy laser, in particular to a distributed reflection type direct liquid-cooling laser gain device with high overlapping efficiency.
Background
The high-power solid laser has the advantages of large output energy, high peak power, high reliability and long service life, and is widely applied to the fields of industry, medical treatment, scientific research, national defense and the like. With the increasing demand of the fields of industrial processing, military, national defense and the like on the laser, higher requirements are put forward on indexes such as power, beam quality, volume, weight and the like of the laser. Conventional solid state laser structures, such as thin-film lasers, slab lasers, etc., have been difficult to meet with new requirements in power-to-volume (weight) ratios. Thermal management is a key factor affecting laser power, efficiency, volume, weight, and other indicators. As laser output power increases, the requirements for thermal management are even further increased. The conventional heat sink type heat dissipation mode of the solid laser can not meet the requirements of high efficiency and rapid heat dissipation of the high-power laser gradually. To meet the heat dissipation requirement, the volume and weight of the heat dissipation structure must be increased, and the complexity of the system is increased. Therefore, it is necessary to design a new heat dissipation method for a solid laser and develop a new compact solid laser.
Direct liquid cooling is an effective heat management mode, the laser gain medium is directly soaked in the cooling liquid, and medium heat is directly taken away through the flowing of the liquid, so that quick and efficient heat management is realized. Under the support of the high-efficiency heat management, a plurality of gain media can be arranged in an array manner, so that distributed gain is realized. However, for the direct liquid-cooled laser, the laser needs to pass through the liquid and the crystal many times, and the refractive index difference between the liquid and the crystal causes fresnel reflection at the interface, so that large loss is generated. The common idea is to adopt a mode of matching the refractive indexes of the crystal and the liquid, and the crystal and the liquid have the same refractive index and then cannot generate Fresnel reflection, but the combination of the crystal and the liquid which can meet the refractive index matching and realize laser output in nature is very few, and the development of the laser is limited. The other idea is that a brewster angle incidence transmission mode between liquid and a crystal is adopted, and the p-polarized laser is completely transmitted and has no loss when being incident into the crystal from the liquid at the brewster angle, so that the defects of the mode are that the brewster angle incidence can cause optical path deviation, and the overlapping efficiency of the laser and a gain medium is low; in addition, although the complexity of the optical path can be reduced by adopting a transmission mode through the laser gain module, the one-way laser gain is lower, a large number of laser gain media are required to be used for improving the laser gain, the cost is increased, the depth of field requirement of pump coupling is increased, the complexity of the pump optical path is increased, and the development of laser with extremely high power is difficult to support.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the invention provides a high-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device, which realizes pupil offset self-compensation of laser and increases overlapping efficiency while reducing Fresnel reflection in the gain device.
The technical scheme adopted by the invention is as follows:
a high crossover efficiency distributed reflective direct liquid cooled laser gain apparatus, said apparatus comprising: the gain module consists of a plurality of gain media 1 and cooling liquid flow channels 2, and a subarea coating wafer 3 and a special-shaped light-transmitting window 4 which are positioned at two sides of the gain module;
the subarea coating wafer 3 transmits partial areas in the gain module and reflects partial areas by utilizing a subarea coating structure;
and pumping light 5 is led in from the special-shaped light-transmitting windows 4 on two sides of the gain module to pump the gain medium 1 and generate laser gain.
The angle of the special-shaped light-transmitting window 4 meets the condition that the main laser L1 is guided into the gain module in a vertical incidence mode, and simultaneously meets the condition that the Brewster angle between the main laser L1 and the gain medium 1 is the same as that between the laser cooling liquid 7 and the gain medium 1Ө B The laser light is incident into the gain medium 1, and finally the amount of refraction shift of the main laser light L1 in the gain medium 1 matches the amount of refraction shift in the laser coolant 7.
Preferably, corresponding parameters of the gain medium 1 and the special-shaped light-transmitting window 4, the position and arrangement relationship of the gain medium and the special-shaped light-transmitting window, and reasonable crystal cut angle are setαEnabling a first refraction offset h1 transmitted by the light of the main laser L1 in the gain medium 1 to be consistent with a second refraction offset h2 transmitted by the laser cooling liquid 7, and realizing pupil offset self-compensation; then the amplified gain medium 1 reaches the reflection area of the opposite subarea coated wafer 3, the main laser L1 is reflected back to the laser gain area at a specific angle, and the transmission area of the subarea coated wafer 3 is reflected and amplified for multiple timesA gain module is derived; meanwhile, pumping light 5 is led in from the special-shaped mirror windows at the two ends of the gain device to pump the gain medium to generate laser gain.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
compared with the prior art, the high-overlapping-efficiency direct liquid-cooling laser gain device provided by the invention adopts a plurality of gain media in an array arrangement, and can obtain higher laser gain in unit volume while reducing the single-chip heat load through the heat dissipation of the flowing laser liquid. According to the technical scheme of the invention, by reasonably setting the angles and the arrangement modes of the special-shaped light-transmitting window and the gain medium, the pupil offset self-compensation of laser can be realized while the incidence at the Brewster angle is adopted to reduce the reflection of Snell, and the overlapping efficiency is increased. The high-overlapping-efficiency direct liquid-cooling laser gain device provided by the invention has the advantages of excellent heat management mode, good quality of output laser beams and the like, is compact and small, and has important application prospect in the field of high-power lasers.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a high overlap efficiency direct liquid-cooled laser gain apparatus according to the present invention;
FIG. 2 is a schematic diagram of a gain module structure involved in the laser gain apparatus of the present invention;
FIG. 3 is a schematic view of a special-shaped light-transmitting window designed in the laser gain device of the present invention;
FIG. 4 is a schematic diagram of a distributed reflection optical path designed in the laser gain device of the present invention;
FIG. 5 is a schematic view of a partitioned coated crystal design for a laser gain apparatus according to the present invention;
FIG. 6 is a schematic diagram of an exemplary laser gain apparatus;
FIG. 7 is a schematic diagram of another embodiment of a laser gain apparatus according to the present invention;
in the figure: 1. gain medium, 2, a cooling liquid flow channel, 3, a partition coated wafer, 4, a special-shaped light-passing window, 5, pumping light, 6, a laser fold mirror, 7, laser cooling liquid, 8, a resonant cavity output mirror, 9, a resonant cavity total reflection mirror, 10, a pumping source, 11, a pumping light refractive mirror, 12 and a laser amplifier seed source.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions of the present invention are described below clearly and completely with reference to the accompanying drawings of the present invention, and based on the embodiments in the present application, other similar embodiments obtained by a person of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.
Example 1
As shown in fig. 1, fig. 1 is a distributed reflection type direct liquid-cooled laser gain device with high overlapping efficiency, which includes: the device comprises a gain module consisting of a plurality of gain media 1 and a cooling liquid flow channel 2, and a partition coated wafer 3 and a special-shaped light-transmitting window 4 which are positioned at two sides of the gain module.
In one embodiment, several, tens or hundreds of gain media 1 are arranged in a distributed array in the gain module, and micro channels are formed between the gain media 1 at intervals as cooling liquid channels 2.
And pumping light 5 is led in from the special-shaped light-transmitting windows 4 on two sides of the gain module to pump the gain medium 1 and generate laser gain.
In one embodiment, the laser gain device may further comprise a laser refractor 6 for guiding the main laser light L1 into the gain module at an angle, and for guiding the output laser light L2 out of the gain module.
The gain medium 1 is used for generating laser gain and realizing laser amplification, and simultaneously, a certain cutting angle is set for the main laser L1 to ensure pupil compensation.
In the embodiment of the present invention, the material of the gain medium 1 is not particularly preferable, and an isotropic gain medium material, such as Nd: YAG material, may be selected, and an anisotropic laser crystal having a birefringence characteristic, such as Nd: YLF, may also be selected as the gain medium.
The laser coolant 7 flows in the coolant flow channel 2 between the gain media 1 and flows over the surface of the gain media 1, thereby directly cooling the gain media 1.
In one embodiment, a liquid having high thermo-mechanical properties (including high thermal conductivity, large heat capacity, etc.) and no significant light absorption at the laser wavelength and the pump light wavelength is preferred as the laser coolant 7, such as heavy water, carbon tetrachloride, etc.
The subarea coating wafer 3 transmits partial areas in the gain module and reflects partial areas by utilizing a subarea coating structure, so that high overlapping efficiency and high-efficiency extraction are realized.
The special-shaped light-transmitting window 4 is used for guiding the pump light 5 and the main laser light L1, so that the pump light 5 is absorbed by the gain medium 1 and the main laser light L1 enters the gain module at a specific angle. The angle of the special-shaped light-transmitting window 4 is designed to meet the requirement that the main laser L1 can be guided into the gain module in a vertical incidence mode, and simultaneously meet the requirement that the main laser L1 can be guided into the gain module at the Brewster angleӨ B When the laser beam enters the gain medium 1, the amount of refraction shift of the main laser beam L1 in the gain medium 1 can be finally made to coincide with the amount of refraction shift in the laser coolant 7, thereby realizing optical shift self-compensation.
Example 2
As shown in fig. 2 and 3, fig. 2 is a schematic structural diagram of the gain medium 1 and the cooling liquid channel 2 in the gain module, fig. 3 is a schematic structural diagram of the special-shaped light transmission window 4, wherein a, b, c, d in fig. 2 respectively represent four faces of the gain medium 1, and A, B, C, D in fig. 3 respectively represent four faces of the special-shaped light transmission window 4.
In practical operation, the main laser L1 is refracted by the laser bending mirror 6, then enters the special-shaped light-transmitting window 4 through the surface D in a vertical manner, is guided into the laser cooling liquid 7 through the surface B, and then enters the gain medium 1 at the brewster angle between the laser cooling liquid 7 and the gain medium 1Ө B Is introduced into the gain medium 1.
In order to realize high overlapping efficiency of the gain device, the angles and the arrangement modes of the gain medium 1 and the special-shaped light-transmitting window 4 need to be designed.
As a preferred embodiment, the placing position modes of the two are as follows: the surface B of the special-shaped light-transmitting window 4 is parallel to the surface B of the gain medium 1, and the surfaces a of all the gain media 1 and the surface A of the special-shaped light-transmitting window 4 are positioned on the same straight line.
Wherein the angle of the gain medium 1 is set as: according to the gain and heat management requirements of the laser, the crystal thickness of the gain medium 1 is set to d 1 The thickness of the cooling liquid flow passage 2 between the gain media 1 is d 2 The refractive index of the gain medium 1 is n 1 Refractive index of liquid n 2 The crystal cut angle between the a-plane and the b-plane of the gain medium 1 isα. In order to satisfy the pupil refraction shift h of the main laser light L1 in the gain medium 1 1 And pupil refractive shift h in liquid 2 Thereby realizing self-compensation and corresponding crystal cutting angleαThe following relationship is required to be satisfied:
Figure 100002_DEST_PATH_IMAGE001
the angle of the special-shaped light-transmitting window 4 is set as follows: the refractive index of the material of the special-shaped light-transmitting window 4 is n 3 And the surface A and the surface C of the special-shaped light-transmitting window 4 are parallel, and the included angle gamma between the surface A and the surface B and the crystal cut angle of the gain medium 1αThe consistency is achieved; meanwhile, in order to enable the main laser L1 to be vertically incident into the special-shaped light-transmitting window 4, an angle β between the surface a and the surface D needs to be specially set, and the following relationship is satisfied:
Figure 396527DEST_PATH_IMAGE002
Figure 100002_DEST_PATH_IMAGE003
。
by setting reasonable crystal corner cutαSo that the first refraction offset h1 transmitted by the main laser L1 in the gain medium 1 is consistent with the second refraction offset h2 transmitted by the laser cooling liquid 7, the pupil offset self-compensation is realized, and the high intersection of the passing light is ensuredThe stacking efficiency. And then the amplified gain medium 1 reaches the reflection area of the opposite subarea coated wafer 3, the main laser L1 is reflected back to the laser gain area at a specific angle, and the gain module is led out from the transmission area of the subarea coated wafer 3 after multiple reflection and amplification. Meanwhile, pumping light 5 is led in from the special-shaped mirror windows at the two ends of the gain device to pump the gain medium 1 to generate laser gain.
Example 3
In order to realize multiple reflection within the gain device to obtain high laser gain, the number of pieces and the length of the gain medium 1 also need to be designed.
In order to achieve efficient laser extraction, it is necessary to ensure that the main laser L1 passes through all regions of the gain medium 1, that is, the leftmost light L1-L of the incident main laser L1 in the incident region is exactly overlapped (or very close to) the rightmost light L1-R of the incident main laser L1 after being reflected once, and the rightmost light L2-R of the output laser L2 is exactly overlapped with the leftmost light L2-L before being reflected last, as shown in fig. 4.
Thus the length L of the gain medium 1 gain The number of reflection times M, the number of gain medium 1 sheet N, and the Brewster angleӨ B Crystal thickness d 1 And thickness d of the flow channel 2 The following relationship is satisfied:
Figure 414161DEST_PATH_IMAGE004
。
the parameters such as the length and the chamfer angle of the divisional coating wafer 3 are the same as those of the gain medium 1, and the substrate of the divisional coating wafer 3 is an undoped crystal, for example, a YAG crystal, and is also the same as that of the gain medium 1.
Two surfaces of the subarea coating wafer 3 are respectively coated with films with different properties. Wherein, the surface S1 adjacent to the special-shaped light transmission window 4 is plated with a first antireflection film; the surface S2 adjacent to the gain medium 1 needs to be coated in a partitioned manner, a first antireflection film is coated in the first region S2-AR region, and a second antireflection film is coated in the second region S2-HR region, as shown in fig. 5.
The second antireflection film is an antireflection film for the wavelengths of the pump light and the main laser light (L1), and the second antireflection film is a high-reflection film for the wavelength of the main laser light (L1) and an antireflection film for the wavelength of the pump light.
Wherein the first region S2-AR has a region length L AR The second region S2-HR has a region length L HR And the two satisfy the following relations:
Figure 100002_DEST_PATH_IMAGE005
Figure 938421DEST_PATH_IMAGE006
。
wherein the length L of the first area S2-AR area AR I.e., the length of the incident region of the incident main laser light L1.
Through the parameter design, the distributed reflection type design in the gain module can realize that the area on the left side of the light spot is overlapped with the area on the right side of the light spot after being reflected, namely, the main laser L1 can perform two times of laser extraction on the gain medium 1 once through the gain module, and the extraction efficiency is greatly improved.
It should be noted that the lengths of the gain medium 1 and the segmented coated wafer 3 in the embodiment of the present invention are designed to satisfy the above relationship, and there is no specific limitation on the width direction parameter.
Example 4
Fig. 6 is a specific implementation application of the laser gain device of the present invention, which is a laser resonator based on a high overlap efficiency distributed reflective direct liquid-cooled laser gain device, and the structure of the laser resonator includes: the high-overlapping-efficiency direct liquid-cooling laser gain device comprises a high-overlapping-efficiency direct liquid-cooling laser gain device, a pumping source 10, a pumping light refractor 11, a resonant cavity output mirror 8 and a resonant cavity total reflection mirror 9.
The laser resonant cavity adopts a double-end pumping mode, and pumping light 5 emitted by pumping sources 10 at two ends is guided into the laser resonant cavity through a pumping light refractor 11. Meanwhile, main laser is guided into the gain module through the laser refractor 6, the pump light 5 is absorbed by the gain medium 1, the laser is amplified back and forth for multiple times in a resonant cavity formed by the resonant cavity output mirror 8 and the resonant cavity total reflection mirror 9, and finally the laser is fed back for multiple times in the resonant cavity, and is output through the resonant cavity output mirror 8 after sufficient gain is obtained.
In the preferred embodiment, the main laser output can be obtained by selecting various laser resonant cavities, including stable cavity, unstable cavity, metastable cavity, etc.
Example 5
Fig. 7 is another specific application of the laser gain device of the present invention, which is a laser amplifier based on a high overlap efficiency distributed reflective direct liquid-cooled laser gain device, and the laser amplifier structure includes: the high-overlapping-efficiency direct liquid-cooling laser gain device comprises a high-overlapping-efficiency direct liquid-cooling laser gain device, a pumping source 10, a pumping light refractor 11 and a laser amplifier seed source 12. The laser resonant cavity adopts a double-end pumping mode, and pumping light 5 emitted by pumping sources 10 at two ends is guided into the laser resonant cavity through a pumping light refractor 11. The seed laser D1 output by the laser amplifier seed source 12 is guided into the gain module by the laser fold mirror 6, is sufficiently amplified after being reflected for multiple times, and is guided out by the other fold mirror.
Seed laser output may be obtained in a preferred embodiment using a variety of laser amplification methods, including various main oscillator stage amplifiers, regenerative amplifiers, and the like.
By adopting the gain modules with a plurality of gain media arranged in an array manner and radiating heat through the flowing laser cooling liquid, the heat load of a single gain medium can be reduced, and meanwhile, higher laser gain can be obtained in unit volume. By reasonably setting the angles and the arrangement modes of the special-shaped window and the gain medium, the pupil offset self-compensation of laser can be realized while reducing the reflection of Snell by adopting the incidence of the Brewster angle, and the overlapping efficiency is increased.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
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.

Claims (7)

1. The utility model provides a high overlapping efficiency distribution reflective direct liquid cooling laser gain device which characterized in that, high overlapping efficiency distribution reflective direct liquid cooling laser gain device includes: the gain module consists of a plurality of gain media (1) and a cooling liquid flow channel (2), and a partition coated wafer (3) and a special-shaped light-transmitting window (4) which are positioned at two sides of the gain module;
the length L of the gain medium (1) gain The number of reflection times M, the number of sheets N of the gain medium (1), and the Brewster angleӨ B Crystal thickness d of gain medium (1) 1 And the thickness d of the coolant flow channel (2) 2 The following relationship is satisfied:
Figure DEST_PATH_IMAGE001
；
the cooling liquid flow channel (2) is a micro flow channel formed by the gain media (1) at intervals;
the subarea coating wafer (3) transmits partial areas in the gain module and reflects partial areas by utilizing a subarea coating structure; two surfaces of the partition coated wafer (3) are respectively coated with films with different properties, wherein the surface (S1) adjacent to the special-shaped light transmission window (4) is coated with a first antireflection film; a surface (S2) adjacent to the gain medium (1) is subjected to partition film coating, a first antireflection film is coated in a first area, and a second antireflection film is coated in a second area;
the first antireflection film is an antireflection film for the pump light and the main laser wavelength, and the second antireflection film is a high-reflection film for the main laser wavelength and an antireflection film for the pump light wavelength; the length of the first region is L AR The length of the second region is L HR And the two satisfy the following relations:
Figure 878781DEST_PATH_IMAGE002
Figure DEST_PATH_IMAGE003
；
pumping light (5) is led in from the special-shaped light-transmitting windows (4) on two sides of the gain module to pump the gain medium (1) and generate laser gain;
leading main laser (L1) into a gain module at a specific angle, amplifying the gain medium (1) by a plurality of pieces, then reaching a reflection area of an opposite subarea coated wafer (3), reflecting the main laser (L1) back to a laser gain area at the specific angle, and leading out the gain module from a transmission area of the subarea coated wafer (3) after multiple reflection and amplification;
the main laser (L1) is led into the gain module at a specific angle, namely the main laser (L1) is led to the gain medium (1) at the Brewster angle between the laser cooling liquid (7) and the gain medium (1)Ө B Is injected into the gain medium (1).
2. A high crossover efficiency distributed reflective direct liquid-cooled laser gain apparatus according to claim 1, wherein said high crossover efficiency distributed reflective direct liquid-cooled laser gain apparatus further comprises a laser refractor (6) for introducing the main laser light (L1) into the gain block at a specific angle.
3. The distributed reflection type direct liquid-cooled laser gain device with high overlap efficiency according to claim 1, wherein the angle of the special-shaped light-transmitting window (4) is such that the main laser (L1) is guided into the gain module by a vertical incidence mode, and finally the refraction offset of the main laser (L1) in the gain medium (1) is consistent with the refraction offset of the laser cooling liquid (7).
4. The method of claim 3The distributed reflection type direct liquid-cooled laser gain device with high overlapping efficiency is characterized in that a gain medium (1) comprises four faces a, b, c and d, wherein b and d are long edges, and an included angle between the face a and the face b is a crystal cut angleα(ii) a The crystal thickness of the gain medium (1) is d 1 The thickness of the cooling liquid channel (2) between the gain media (1) is d 2 The refractive index of the gain medium (1) is n 1 Refractive index of liquid n 2 The pupil refraction shift h of the gain medium (1) in order to satisfy the main laser light (L1) in the gain medium (1) 1 And pupil refractive shift h in liquid 2 Consistent, corresponding crystal cut angleαThe following relationship is required to be satisfied:
Figure 343391DEST_PATH_IMAGE004
，
Ө B is the brewster angle.
5. The distributed reflection type direct liquid-cooled laser gain device with high overlapping efficiency according to claim 4, wherein the special-shaped light-transmitting window (4) comprises A, B, C, D four faces, a face A is parallel to a face C, an included angle between the face A and the face B is gamma, and an included angle between the face A and the face D is an angle beta;
the refractive index of the material of the special-shaped light-transmitting window (4) is n 3 In order to make the main laser (L1) vertically incident into the special-shaped light-transmitting window (4), the following relation is required:
Figure DEST_PATH_IMAGE005
Figure 185445DEST_PATH_IMAGE006
。
6. the distributed reflection type direct liquid-cooled laser gain device with high crossover efficiency as claimed in claim 5, wherein the surface B of the special-shaped light-transmitting window (4) is parallel to the surface B of the gain medium (1), and the surfaces a of all the gain medium (1) and the surface A of the special-shaped light-transmitting window (4) are located on a straight line.
7. The distributed reflection direct liquid-cooled laser gain device with high crossover efficiency as claimed in claim 6, wherein the reasonable crystal cut angle is setαThe first refraction offset h1 transmitted by the main laser (L1) in the gain medium (1) is consistent with the second refraction offset h2 transmitted by the laser cooling liquid (7), so that pupil offset self-compensation is realized.
CN202210754007.7A 2022-06-30 2022-06-30 High-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device Active CN114824998B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210754007.7A CN114824998B (en) 2022-06-30 2022-06-30 High-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210754007.7A CN114824998B (en) 2022-06-30 2022-06-30 High-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device

Publications (2)

Publication Number Publication Date
CN114824998A CN114824998A (en) 2022-07-29
CN114824998B true CN114824998B (en) 2022-10-18

Family

ID=82522939

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210754007.7A Active CN114824998B (en) 2022-06-30 2022-06-30 High-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device

Country Status (1)

Country Link
CN (1) CN114824998B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117134179B (en) * 2023-10-26 2024-03-29 中国工程物理研究院应用电子学研究所 Angle array type gain module capable of eliminating return light and preventing self-oscillation and laser amplifying device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006072182A1 (en) * 2005-01-10 2006-07-13 Kresimir Franjic Laser amplifiers with high gain and small thermal aberrations
CN111403999A (en) * 2020-03-09 2020-07-10 中国工程物理研究院应用电子学研究所 Laser amplification device capable of realizing laser output of high-power structure light field and laser

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6094297A (en) * 1998-07-07 2000-07-25 Trw Inc. End pumped zig-zag slab laser gain medium
US6418156B1 (en) * 1998-11-12 2002-07-09 Raytheon Company Laser with gain medium configured to provide an integrated optical pump cavity
US6219361B1 (en) * 1999-06-21 2001-04-17 Litton Systems, Inc. Side pumped, Q-switched microlaser
WO2003047052A2 (en) * 2001-11-21 2003-06-05 General Atomics Laser containing a distributed gain medium
US6967766B2 (en) * 2003-04-29 2005-11-22 Raytheon Company Zigzag slab laser amplifier with integral reflective surface and method
WO2005088782A1 (en) * 2004-03-15 2005-09-22 Adelaide Research & Innovation Pty Ltd Optical amplifier
AT414285B (en) * 2004-09-28 2006-11-15 Femtolasers Produktions Gmbh MULTI-REFLECTION DELAY RANGE FOR A LASER BEAM AND RESONATOR BZW. SHORT-PULSE LASER DEVICE WITH SUCH A DELAYED TRACK
US7280571B2 (en) * 2004-11-23 2007-10-09 Northrop Grumman Corporation Scalable zig-zag laser amplifier
CN201478678U (en) * 2009-09-10 2010-05-19 福州高意通讯有限公司 Tension type folding-cavity laser
CN103346467A (en) * 2013-06-17 2013-10-09 中国工程物理研究院应用电子学研究所 Multi-laser-medium integration gain system
CN205724359U (en) * 2016-04-26 2016-11-23 武汉市杰都易光电科技有限公司 Quasiconductor single-ended pumping many foldings cavity laser
CN206195144U (en) * 2016-11-25 2017-05-24 中国工程物理研究院应用电子学研究所 Accurate three -level laser amplifier system light path adjustment device
CN111313212B (en) * 2020-02-12 2021-08-24 中国工程物理研究院应用电子学研究所 High-overlapping-efficiency direct liquid-cooling laser gain device and laser resonant cavity
CN111404000B (en) * 2020-03-09 2021-06-15 中国工程物理研究院应用电子学研究所 Direct liquid cooling array type thin unstable resonant cavity capable of inhibiting high-order distortion in cavity
CN113889831A (en) * 2021-05-28 2022-01-04 中国科学院理化技术研究所 Compact type strip pulse laser

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006072182A1 (en) * 2005-01-10 2006-07-13 Kresimir Franjic Laser amplifiers with high gain and small thermal aberrations
CN111403999A (en) * 2020-03-09 2020-07-10 中国工程物理研究院应用电子学研究所 Laser amplification device capable of realizing laser output of high-power structure light field and laser

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Effect of amplified spontaneous emission and parasitic oscillations on the performance of cryogenically-cooled slab amplifiers;Sawicka, M等;《LASER AND PARTICLE BEAMS》;20131231;第31卷(第4期);第553-560页 *
Yb:YAG薄片多程激光放大器的设计及实验研究;宋恩茂等;《光学学报》;20191231;第39卷(第12期);第221-226页 *

Also Published As

Publication number Publication date
CN114824998A (en) 2022-07-29

Similar Documents

Publication Publication Date Title
US7430230B2 (en) Tube solid-state laser
US6810060B2 (en) High-average power active mirror solid-state laser with multiple subapertures
EP1480299B1 (en) Diode-pumped solid state disk laser and method for producing uniform laser gain
US6834070B2 (en) Edge-facet pumped, multi-aperture, thin-disk laser geometry for very high average power output scaling
US20040114657A1 (en) Side-pumped solid-state disk for high-average power
CN103779772B (en) Adopt laser module and the solid statelaser of recombination pump coupling
WO2021128828A1 (en) End-pump multi-pass slab laser amplifier
EP0974177B1 (en) Thermally improved slab laser pump cavity apparatus with integral concentrator
CN110086070B (en) Novel thin-chip laser structure with high pumping absorption and high power output
CN114824998B (en) High-overlapping-efficiency distributed reflection type direct liquid-cooling laser gain device
CN100399651C (en) Lath laser for implementing Z shape light path by reflecting glass
CN100399652C (en) Covering doped plane waveconducting laser amplifier
CN1159810C (en) Corner pumping method for plate strip and its solid laser gain module
CN111313212B (en) High-overlapping-efficiency direct liquid-cooling laser gain device and laser resonant cavity
CN113078534B (en) Intracavity cascade pump laser based on composite structure gain medium
CN114883903B (en) High compact type series connection direct liquid cooling high power laser device based on polarization selection
CN103414097A (en) Laser amplifier
CN2598214Y (en) Solid strip laser of laser diode inclination pumping
CN114142328B (en) Ho laser with high beam quality
CN114709706A (en) Double-cladding erbium glass planar waveguide multi-pass amplifier based on composite structure
CN105375253B (en) A kind of double Z shaped battened construction laser amplification device of the more space angles of high efficiency
CN102185237B (en) High-power and 1,319 nm single-wavelength continuous laser device
CN104917039A (en) Multi-pass total reflection laser amplification module
CN117134180B (en) High-power planar waveguide laser amplification gain module and laser
CN215221258U (en) From two-way angle multiplexing lath laser gain medium and two-way four-way laser gain module

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant