CN107104350B - Laser amplifier - Google Patents
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- CN107104350B CN107104350B CN201710380401.8A CN201710380401A CN107104350B CN 107104350 B CN107104350 B CN 107104350B CN 201710380401 A CN201710380401 A CN 201710380401A CN 107104350 B CN107104350 B CN 107104350B
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- 239000013078 crystal Substances 0.000 claims abstract description 184
- 239000000110 cooling liquid Substances 0.000 claims abstract description 48
- 238000003384 imaging method Methods 0.000 claims abstract description 20
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 6
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 description 9
- 239000007787 solid Substances 0.000 description 8
- 239000002826 coolant Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 241000276425 Xiphophorus maculatus Species 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0602—Crystal lasers or glass 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
Abstract
The invention provides a laser amplifier, and belongs to the technical field of laser instruments. The laser amplifier solves the problem of low light conversion efficiency of the existing laser amplifier. The laser amplifier comprises a seed light source, a pumping source and a gain module, wherein the gain module comprises a box body, a plurality of laser gain crystals and cooling liquid which are sequentially arranged in parallel are arranged in the box body, each laser gain crystal is positioned in the cooling liquid, the seed light source is opposite to one end face of a first laser gain crystal, the refractive index of the laser gain crystal is larger than that of the cooling liquid, seed laser emitted by the seed light source enters from the end face of the laser gain crystal and can realize total reflection in the laser gain crystal, and an imaging module is arranged between adjacent laser gain crystals along the length direction of the laser gain crystal and exits from the other end face. The laser of the laser amplifier does not generate wave front distortion through a flow field, interface loss in the propagation process is avoided, the gain path is longer, and the light conversion efficiency is high.
Description
Technical Field
The invention belongs to the technical field of laser instruments, and relates to a laser amplifier.
Background
The Main Oscillation Power Amplification (MOPA) system, namely the main oscillator, is adopted to output low-power high-beam-quality laser, and finally high-power laser output is obtained through the power amplifier, so that the method is one of effective ways for realizing high-power high-beam-quality laser output.
In a large-caliber laser, for example, a slab or a sheet, as a gain medium, the large-caliber gain medium is usually welded to a cooler, and the gain medium and the cooler together form a gain medium module. To obtain a high power laser output, it is not usually enough to use only one stage of amplification, and each time a piece of laser gain medium is added, a complete set of cooler equipment, i.e. a gain module, is needed to be added, so that the whole MOPA system becomes huge with the increase of the laser power.
For this purpose, U.S. patent application (application number: US7366211B 2) discloses a laser amplifier comprising a seed light source, a pump source and a gain module, wherein the gain module comprises a cooling box body provided with a cooling liquid therein and a plurality of laser gain crystals, the laser gain crystals are immersed in the cooling liquid, the cooling liquid directly flows through the surfaces of the laser gain crystals to cool the laser gain crystals, and the cooling of the laser gain crystals can be realized by only one cooling box body, so that the laser has compact and small size.
The laser amplifier described above still has the following drawbacks: 1. since the seed laser emitted by the seed light source needs to be subjected to multistage gain amplification through each laser gain crystal, the seed laser is incident along the distribution direction of a plurality of laser gain crystals, the seed laser needs to pass through cooling liquid, and the cooling liquid is heated in the process of cooling the laser gain crystals, so that the wave front distortion of the laser is caused, and the light conversion efficiency is affected. 2. Due to the difference of refractive indexes of the cooling liquid and the gain medium, the interface loss caused by seed laser in the propagation process of the fluid-solid interface from the solid laser gain crystal into the fluid and from the fluid-solid interface from the fluid-solid laser gain crystal is large, so that the light conversion efficiency is affected. 3. The seed laser vertically passes through the whole cooling box body, the formed gain path is shorter, and the light conversion efficiency is lower.
Disclosure of Invention
The invention aims at solving the problems in the prior art, and provides a laser amplifier, which aims at solving the technical problems that: how to improve the light conversion efficiency.
The aim of the invention can be achieved by the following technical scheme: the utility model provides a laser amplifier, includes seed light source, pumping source and gain module, gain module includes the box body, be equipped with a plurality of long platy and in proper order parallel arrangement's laser gain crystal in the box body, still be equipped with the coolant liquid that can circulation flow in the box body, each laser gain crystal all is located in the coolant liquid, its characterized in that, seed light source is relative with one end face of first laser gain crystal, the refracting index of laser gain crystal is greater than the refracting index of coolant liquid, seed laser that the seed light source sent is from the terminal surface incidence of laser gain crystal and can realize total reflection in the laser gain crystal to follow the length direction of laser gain crystal and export from another terminal surface, still be equipped with between the adjacent laser gain crystal and can realize total reflection's imaging module in the laser reflection to the next laser gain crystal from last laser gain crystal.
According to the laser amplifier, the plurality of laser gain crystals are immersed in the cooling liquid, and the cooling liquid flows through two plate surfaces of the laser gain crystals to cool, so that the plurality of laser gain crystals can be cooled by only one cooling box body, and the structure is compact. The refractive index of the laser gain crystal is larger than that of the cooling liquid, namely the laser gain crystal is an optically dense medium, the cooling liquid is an optically sparse medium, seed laser emitted by the seed light source enters from the end face of the laser gain crystal and can realize total reflection in the laser gain crystal, exits from the other end face along the length direction of the laser gain crystal, and is reflected into the next laser gain crystal under the action of the imaging module, and total reflection is repeated in sequence. That is, the seed laser does not pass through the cooling liquid, and the laser is not influenced by the flow field of the cooling liquid to generate wave front distortion. Meanwhile, the laser is transmitted in the laser gain crystal, and the laser does not need to be transmitted through a fluid-solid interface any more, so that interface loss can not be generated in the transmission process, and the light conversion efficiency is improved. And laser propagates along the length direction of the laser gain crystal and moves through a total reflection broken line path in the laser gain crystal, so that the path of the gain is longer, and the light conversion efficiency is further improved.
In the above-mentioned laser amplifier, the both ends of laser gain crystal stretch out the box body and with be sealing connection between the box body, the seed light source is located one side of box body and is relative with one end face of first laser gain crystal, imaging module sets up outside the box body and is located between corresponding two adjacent laser gain crystals, the incident direction of seed laser that the seed light source sent with the length direction of laser gain crystal is unanimous, the both ends face of laser gain crystal is inclined plane and the opposite inclination of the inclination of both ends face is the same. The two ends of the laser gain crystal extend out of the box body, the seed light source is positioned on one side of the box body and opposite to one end face of the first laser gain crystal, and the imaging module is arranged outside the box body, so that seed laser emitted by the seed light source can directly enter the laser gain crystal and spread among the laser gain crystals, laser cannot pass through the box body, interface loss of the laser in the spreading process is avoided, and light conversion efficiency is further improved. Meanwhile, the inclination directions of the two end faces are opposite and the inclination angles are the same, so that the laser incident from one end face of the laser gain crystal can be reflected to the other end face through the total reflection folding line path, can exit along the parallel length direction after being refracted by the end face, and is reflected by the imaging module and then enters the next laser gain crystal along the parallel length direction. Meanwhile, two end faces of the laser gain crystal are designed to be inclined planes, so that laser emitted by the seed light source is incident in parallel relative to the length direction of the laser gain crystal, and the structure is more compact.
In the above-mentioned laser amplifier, the inclination angle θ of the laser gain crystal end face satisfies the following formula:0°＜θ 0 θ < 90 °, where n 0 Is air refractive index, n l For refractive index of cooling liquid, n s Is the refractive index of the laser gain crystal. The incidence direction of the seed laser emitted by the seed light source is consistent with the length direction of the laser gain crystal, the end face of the laser gain crystal is an inclined plane, the inclined angle of the inclined plane is the included angle between the seed laser and the end face, the seed light source is refracted after being incident on the laser gain crystal, then total reflection occurs again, the inclined angle theta of the end face of the laser gain crystal meets the conditions, the incident angle of the seed light source after being incident on the laser gain crystal and being incident on the interface of the laser gain crystal and the cooling liquid after being refracted can be ensured to be larger than the critical angle of the laser gain crystal and the cooling liquid, namely the laser can be ensured to be in fact in the laser gain crystalAt present, the total reflection is carried out to form a zigzag path, so that seed laser does not pass through cooling liquid and is not influenced by a cooling liquid flow field to generate wave front distortion. Meanwhile, laser does not need to be transmitted through a fluid-solid interface any more, loss can not be generated in the transmission process, the gain path is longer, and the light conversion efficiency is improved. Meanwhile, by accurately controlling the inclination angle of the end face of the laser gain crystal, the arrangement position and incidence angle of seed laser and the arrangement position and reflection angle of the imaging module do not need to be adjusted, so that the structure is simpler and more convenient, and meanwhile, the structure can be ensured to be more compact.
In the above laser amplifier, the portion of the laser gain crystal located in the box body adopts Nd: the YAG crystal material is made, the two end parts of the laser gain crystal extending out of the box body are made of undoped YAG crystal material, and the laser gain crystal is of an integrated structure. The laser gain crystal is positioned in the box body, and Nd: the YAG crystal material is made, can absorb pumping light and is mainly used for amplifying laser, the two ends of the laser gain crystal extending out of the box body are made of undoped YAG crystal material, the pumping light can not be absorbed to generate heat, the deformation of the end face of the laser gain crystal can be relieved to a certain extent, the wave front distortion of the laser is prevented, and the light conversion efficiency is further improved.
In the above-mentioned laser amplifier, the imaging module includes two mirrors, the two mirrors are opposite to the extending ends of the corresponding laser gain crystals respectively, the two mirrors are mutually perpendicular to each other, the two mirrors can reflect the seed laser emitted from the previous laser gain crystal to the next laser gain crystal and make the incident direction of the seed laser always keep consistent with the length direction of the laser gain crystal. The two reflectors are mutually perpendicular and respectively opposite to the extending ends of the corresponding laser gain crystals, so that horizontally emergent laser can be reflected to the next laser gain crystal in a horizontal incidence mode, total reflection is realized, the laser is prevented from being influenced by a cooling liquid flow field to generate wave front distortion, loss of the laser in the propagation process is reduced, meanwhile, the gain path is longer, and the light conversion efficiency is improved.
In the above laser amplifier, the imaging module further includes two convex lenses, the two convex lenses are parallel and arranged side by side and respectively opposite to the corresponding laser gain crystals, and the convex lenses are located between the corresponding laser gain crystals and the reflecting mirror. The light is refracted and totally reflected by the laser gain crystal, so that the light spot size can be changed, the light cannot completely enter the laser gain crystal after being reflected by the reflecting mirror, and the laser emitted from the last laser gain crystal can be converged and reflected into the next laser gain crystal again by the light spots with the same size through the action of the two convex lenses by arranging the convex lenses between the laser gain crystal and the reflecting mirror, so that the light conversion efficiency is improved.
In the above-described laser amplifier, the optical propagation path of the seed laser beam, which propagates from the end face of the laser gain crystal to the corresponding convex lens after passing out, is equal to a doubled focal length value, the optical propagation path of the seed laser beam, which propagates from the previous convex lens to the next convex lens, is equal to a doubled focal length value, and the optical propagation path of the seed laser beam, which propagates from the next convex lens to the end face of the next laser gain crystal, is equal to a doubled focal length value. By setting the proportion between the propagation path and the focal length value, seed lasers emitted from the last laser gain crystal can be converged again at the end face of the next laser gain crystal to form a 1:1 image, so that the loss of lasers in the propagation process is further reduced, and the light conversion efficiency is improved.
In the above-mentioned laser amplifier, the box body is the cuboid form, the incident direction of the pumping laser that the pumping source sent is unanimous with the thickness direction of laser gain crystal, still be equipped with the inlet that is used for the coolant liquid inflow on the lateral wall of box body and be used for the coolant liquid to flow out the liquid outlet, the coolant liquid is unanimous with the width direction of laser gain crystal in the flow direction of box body, through circulating line intercommunication between inlet and the liquid outlet. Foretell structural design for seed light source is located box body length direction's one side, and each imaging module is located box body length direction's both sides, and pumping light source is located box body direction's both sides, and inlet and liquid outlet are located box body width direction's both sides, rational arrangement space, and the structure is compacter. And the flowing direction of the cooling liquid is consistent with the width direction of the laser gain crystal, the cooling liquid can flow through two large side surfaces of the laser gain crystal for cooling, and the cooling effect is better.
In the laser amplifier, the two sides of the laser gain crystal in the width direction are fixed on the two side walls of the box body through fixing pieces, and the fixing pieces are made of stainless steel materials. The two sides of the laser gain crystal are fixed on the two side walls of the box body through the fixing piece, so that a plurality of flow channels are formed among the laser gain crystals, the flow channel direction of the cooling liquid flows along the flow channels, and the cooling effect is better. The fixing piece can be a fixing block and a bolt, and also can be a fixing seat.
In the laser amplifier, the cooling liquid is deionized water or heavy water or carbon tetrachloride liquid. The refractive index of the liquid is equal to that of Nd: the YAG crystal has a low refractive index so that the laser light can generate total reflection within the laser gain crystal.
Compared with the prior art, the laser amplifier has the following advantages:
1. the seed laser can not pass through the cooling liquid, and the laser can not be influenced by the flow field of the cooling liquid to generate wave front distortion.
2. Meanwhile, the laser is transmitted in the laser gain crystal, and the laser does not need to be transmitted through a fluid-solid interface any more, so that interface loss can not be generated in the transmission process.
3. The laser propagates along the length direction of the laser gain crystal and moves along the total reflection broken line path in the laser gain crystal, so that the path of the gain is longer, and the light conversion efficiency is further improved.
4. The two ends of the laser gain crystal extending out of the box body are made of undoped YAG crystal materials, so that the deformation of the end face of the laser gain crystal can be relieved to a certain extent, the wave front distortion of laser is prevented, and the light conversion efficiency is further improved.
5. Through the inclination of accurate control laser gain crystal terminal surface, no longer need go to debug seed light source's placement position and incident angle, and imaging module's placement position and reflection angle, it is more simple and convenient, can guarantee simultaneously that the structure is compacter.
6. The two convex lenses are arranged at a distance equal to twice the focal length value, so that laser light emitted from the last laser gain crystal can be re-gathered at the end face of the next laser gain crystal to form 1:1 imaging.
Drawings
Fig. 1 is a structural diagram of the present laser amplifier.
Fig. 2 is a block diagram of the present laser amplifier in another direction.
Fig. 3 is a partial block diagram of the present gain module.
In the figure, 1, a seed light source; 2. a pump source; 3. a gain module; 3a, a box body; 3a1, a liquid inlet; 3a2, a liquid outlet; 3b, laser gain crystal; 4. a cooling liquid; 5. an imaging module; 5a, a reflecting mirror; 5b, convex lens; 6. a circulation pipe; 7. and a fixing piece.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 and 2, the present laser amplifier includes a seed light source 1, a pump source 2, and a gain module 3.
The gain module 3 comprises a box body 3a, the box body 3a is in a cuboid shape, a plurality of long-plate-shaped laser gain crystals 3b which are sequentially arranged in parallel are arranged in the box body 3a, the two sides of the laser gain crystals 3b in the width direction are fixed on the two side walls of the box body 3a through fixing pieces 7, and the fixing pieces 7 are made of stainless steel materials. The box body 3a is also internally provided with a cooling liquid 4 capable of circularly flowing, the cooling liquid 4 is deionized water or heavy water or carbon tetrachloride liquid, and each laser gain crystal 3b is positioned in the cooling liquid 4. The incident direction of the pump laser emitted by the pump source 2 is consistent with the thickness direction of the laser gain crystal 3b, the side wall of the box body 3a is also provided with a liquid inlet 3a1 for the inflow of the cooling liquid 4 and a liquid outlet 3a2 for the outflow of the cooling liquid 4, the flowing direction of the cooling liquid 4 in the box body 3a is consistent with the width direction of the laser gain crystal 3b, and the liquid inlet 3a1 and the liquid outlet 3a2 are communicated through a circulating pipeline 6. The seed light source 1 is located at one side of the box body 3a and opposite to one end face of the first laser gain crystal 3b, the incidence direction of the seed laser emitted by the seed light source 1 is consistent with the length direction of the laser gain crystal 3b, and the space arrangement of each part is reasonable and the structure is more compact.
The seed light source 1 is opposite to one end face of the first laser gain crystal 3b, the refractive index of the laser gain crystal 3b is larger than that of the cooling liquid 4, seed laser emitted by the seed light source 1 enters from the end face of the laser gain crystal 3b and can realize total reflection in the laser gain crystal 3b, the seed laser is emitted from the other end face along the length direction of the laser gain crystal 3b, an imaging module 5 capable of reflecting laser emitted from the last laser gain crystal 3b to the next laser gain crystal 3b to realize total reflection is arranged between the adjacent laser gain crystals 3b, and the imaging module 5 is arranged outside the box body 3a and is positioned between the two adjacent laser gain crystals correspondingly.
Specifically, as shown in fig. 1 and 3, two ends of the laser gain crystal 3b extend out of the box body 3a and are in sealing connection with the box body 3a, two end faces of the laser gain crystal 3b are inclined planes, and the inclination directions of the two end faces are opposite and the inclination angles are the same. The inclination angle θ of the end face of the laser gain crystal 3b satisfies the following formula:0°＜θ 0 θ < 90 °, where n 0 Is air refractive index, n l For refractive index of coolant 4, n s Is the refractive index of the laser gain crystal 3 b. The inclination angle theta of the end face of the laser gain crystal 3b meets the conditions, the arrangement position and the incidence angle of seed laser and the arrangement position and the reflection angle of the imaging module 5 do not need to be adjusted any more, the incidence angle of the seed light source 1 to the interface of the laser gain crystal 3b and the cooling liquid 4 after the seed light source 1 is refracted and the incidence angle of the seed light source to the interface of the laser gain crystal 3b and the cooling liquid 4 is larger than the critical angle of the laser gain crystal 3b and the cooling liquid 4, namely the laser can be ensured to realize a total reflection fold line path in the laser gain crystal 3b, the seed laser does not pass through the cooling liquid 4 and is not influenced by the flow field of the cooling liquid 4 to generate wave front distortion. As same asWhen the seed laser is transmitted through the fluid-solid interface, loss can not be generated in the transmission process, the gain path is longer, the light conversion efficiency is improved, and the structure is more compact.
The portion of the laser gain crystal 3b located in the case 3a employs Nd: the YAG crystal material is made, and the two end parts of the laser gain crystal 3b extending out of the box body 3a are made of undoped YAG crystal material, so that the end face deformation of the laser gain crystal 3b can be relieved to a certain extent, the wave front distortion of laser is prevented, and the light conversion efficiency is further improved. The laser gain crystal 3b is of an integral structure.
The imaging module 5 includes two reflecting mirrors 5a and two convex lenses 5b. The two reflecting mirrors 5a are opposite to the extending ends of the corresponding laser gain crystals 3b, the two reflecting mirrors 5a are perpendicular to each other, the two reflecting mirrors 5a can reflect the seed laser emitted from the previous laser gain crystal 3b to the next laser gain crystal 3b, and the incident direction of the seed laser always keeps consistent with the length direction of the laser gain crystal 3 b. The two convex lenses 5b are arranged in parallel and side by side and are respectively positioned between the corresponding laser gain crystal 3b and the reflecting mirror 5a, the optical propagation path of the seed laser propagating from the end face of the laser gain crystal 3b to the corresponding convex lens 5b is equal to a double focal length value, the optical propagation path of the seed laser propagating from the previous convex lens 5b to the next convex lens 5b is equal to a double focal length value, and the optical propagation path of the seed laser propagating from the next convex lens to the end face of the next laser gain crystal 3b is equal to a double focal length value. Through the action of the two reflectors 5a and the convex lens 5b, laser emitted from the last laser gain crystal 3b can be converged again at the end face of the next laser gain crystal 3b to form a 1:1 image, so that the loss of the laser in the propagation process is further reduced, and the light conversion efficiency is improved.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (9)
1. The laser amplifier comprises a seed light source (1), a pumping source (2) and a gain module (3), wherein the gain module (3) comprises a box body (3 a), a plurality of laser gain crystals (3 b) which are in a long plate shape and are sequentially arranged in parallel are arranged in the box body (3 a), cooling liquid (4) capable of circularly flowing is further arranged in the box body (3 a), each laser gain crystal (3 b) is positioned in the cooling liquid (4), and the laser amplifier is characterized in that the seed light source (1) is opposite to one end face of a first laser gain crystal (3 b), the refractive index of the laser gain crystal (3 b) is larger than that of the cooling liquid (4), seed laser emitted by the seed light source (1) enters from the end face of the laser gain crystal (3 b) and can realize total reflection in the laser gain crystal (3 b), laser beams emitted from the other end face of the laser gain crystal (3 b) along the length direction of the laser gain crystal (3 b), and a laser module capable of reflecting the laser beams reflected from the laser gain crystal (3 b) to the next laser gain crystal (5) is further arranged between the adjacent laser gain crystals (3 b); the two ends of the laser gain crystal (3 b) extend out of the box body (3 a) and are in sealing connection with the box body (3 a), and the part of the laser gain crystal (3 b) located in the box body (3 a) adopts Nd: the laser gain crystal (3 b) is made of a YAG crystal material, two end parts of the laser gain crystal (3 b) extending out of the box body (3 a) are made of undoped YAG crystal materials, and the laser gain crystal (3 b) is of an integrated structure.
2. The laser amplifier according to claim 1, wherein the seed light source (1) is located at one side of the box body (3 a) and opposite to one end face of the first laser gain crystal (3 b), the imaging module (5) is disposed outside the box body (3 a) and located between two adjacent laser gain crystals (3 b), the incidence direction of the seed laser emitted by the seed light source (1) is consistent with the length direction of the laser gain crystal (3 b), and two end faces of the laser gain crystal (3 b) are inclined faces and the inclination directions of the two end faces are opposite and the inclination angles are the same.
3. Root of Chinese characterA laser amplifier according to claim 2, characterized in that the inclination angle θ of the end face of the laser gain crystal (3 b) satisfies the following formula: 0°＜θ 0 θ < 90 °, where n 0 Is air refractive index, n l For the refractive index of the cooling liquid (4), n s Is the refractive index of the laser gain crystal (3 b).
4. A laser amplifier according to claim 2 or 3, wherein the imaging module (5) comprises two reflecting mirrors (5 a), the two reflecting mirrors (5 a) are respectively opposite to the protruding ends of the corresponding laser gain crystals (3 b), the two reflecting mirrors (5 a) are arranged perpendicular to each other, the two reflecting mirrors (5 a) can reflect the seed laser emitted from the previous laser gain crystal (3 b) to the next laser gain crystal (3 b) and enable the incident direction of the seed laser to always keep consistent with the length direction of the laser gain crystal (3 b).
5. The laser amplifier according to claim 4, characterized in that the imaging module (5) further comprises two convex lenses (5 b), the two convex lenses (5 b) being arranged parallel side by side and respectively opposite to the corresponding laser gain crystals (3 b), the convex lenses (5 b) being located between the corresponding laser gain crystals (3 b) and the mirror (5 a).
6. A laser amplifier according to claim 5, characterized in that the optical propagation path of the seed laser light from the end face of the laser gain crystal (3 b) to the corresponding convex lens (5 b) is equal to one time the focal length value, the optical propagation path of the seed laser light from the previous convex lens (5 b) to the next convex lens (5 b) is equal to two times the focal length value, and the optical propagation path of the seed laser light from the next convex lens (5 b) to the end face of the next laser gain crystal (3 b) is equal to one time the focal length value convex lens (5 b).
7. The laser amplifier according to claim 1, 2 or 3, wherein the box body (3 a) is rectangular, the incident direction of the pump laser emitted by the pump source (2) is consistent with the thickness direction of the laser gain crystal (3 b), the side wall of the box body (3 a) is further provided with a liquid inlet (3 a 1) for the inflow of the cooling liquid (4) and a liquid outlet (3 a 2) for the outflow of the cooling liquid (4), the flowing direction of the cooling liquid (4) in the box body (3 a) is consistent with the width direction of the laser gain crystal (3 b), and the liquid inlet (3 a 1) is communicated with the liquid outlet (3 a 2) through a circulating pipeline (6).
8. The laser amplifier according to claim 7, wherein the laser gain crystal (3 b) is fixed on both side walls of the case (3 a) by fixing members (7) on both sides in the width direction, and the fixing members (7) are made of stainless steel material.
9. A laser amplifier according to claim 1 or 2 or 3, characterized in that the cooling liquid (4) is deionized water or heavy water or carbon tetrachloride liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380401.8A CN107104350B (en) | 2017-05-25 | 2017-05-25 | Laser amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380401.8A CN107104350B (en) | 2017-05-25 | 2017-05-25 | Laser amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN107104350A CN107104350A (en) | 2017-08-29 |
| CN107104350B true CN107104350B (en) | 2023-07-28 |
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|---|---|---|---|
| CN201710380401.8A Active CN107104350B (en) | 2017-05-25 | 2017-05-25 | Laser amplifier |
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| CN108110598A (en) * | 2018-02-11 | 2018-06-01 | 中国工程物理研究院应用电子学研究所 | A kind of slab laser gain module |
| CN109378693B (en) * | 2018-12-11 | 2024-02-20 | 中国工程物理研究院激光聚变研究中心 | Laser gain structure and laser |
| CN117117624A (en) * | 2023-08-21 | 2023-11-24 | 重庆师范大学 | Distributed suspended particle gain module and laser |
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