CN116845686A - Wavelength-adjustable multi-medium efficient laser amplification device and method - Google Patents
Wavelength-adjustable multi-medium efficient laser amplification device and method Download PDFInfo
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- CN116845686A CN116845686A CN202310843409.9A CN202310843409A CN116845686A CN 116845686 A CN116845686 A CN 116845686A CN 202310843409 A CN202310843409 A CN 202310843409A CN 116845686 A CN116845686 A CN 116845686A
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- 239000005371 ZBLAN Substances 0.000 claims description 3
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Abstract
The invention provides a wavelength-adjustable multi-medium efficient laser amplification device and a method. The first-stage laser amplification system comprises a first pumping mirror, a first gain medium and a first partial reflector which are sequentially arranged, pumping light emitted by a pumping source enters the first gain medium through the first pumping mirror, and is amplified by the first gain medium and then transmitted to the first partial reflector. The second-stage laser amplification system comprises a second pumping mirror, a second gain medium and a second partial reflecting mirror which are sequentially arranged, wherein a first gain laser beam enters the second gain medium through the second pumping mirror and is amplified by the second gain medium and then is transmitted toA second partial mirror. SiO is sequentially laminated and wrapped on the outer side of the first gain medium 2 Crystal, au film and plastic housing, siO 2 The nano wire is mixed between the crystal and the Au film, and the nano wire can be formed by selecting proper SiO 2 The film thickness ratio K of the crystal and the Au thin film tunes the laser wavelength.
Description
Technical Field
The invention belongs to the technical field of laser amplification, and particularly relates to a wavelength-adjustable multi-medium efficient laser amplification device and method.
Background
The high-energy laser has the characteristics of high energy and specific wavelength, and has wide application in the fields of industrial precision machining, medical treatment, military national defense and the like. The current advanced laser amplification technology is to amplify by using a cooled end-pumped slab laser, so that the absorption of the gain medium to the pumping light can be effectively improved, and the laser output with high power and high beam quality can be obtained. By combining the power amplification technology of the master oscillator, the output power of the laser can be further improved, and high-power fundamental frequency light can be obtained. Although the method can realize high-power laser output, the fatal defect that the wavelength of the output laser beam is not adjustable exists, and only the laser output with fixed wavelength can be realized, so that the corresponding solid gain medium is difficult to be matched accurately, and the application field of high-power laser is limited. Therefore, it is of great significance to study the multi-stage laser amplification method with tunable high-power laser wavelength.
Disclosure of Invention
Aiming at the problems that the wavelength of the output laser beam of the existing laser is not adjustable, the solid gain medium is difficult to match and the gain medium is single, the invention provides a wavelength-adjustable multi-medium high-efficiency laser amplifying device and method, which can be realized by selecting proper SiO (silicon oxide) 2 The film thickness ratio K of the crystal and the Au film regulates the burst-Moss effect, thereby tuning the laser wavelength.
The present invention achieves the above technical object by the following means.
The wavelength-adjustable multi-medium efficient laser amplification device is characterized by comprising a pumping source, a primary laser amplification system and a secondary laser amplification system which are sequentially arranged.
The first-stage laser amplification system comprises a first pumping mirror, a first gain medium and a first partial reflector which are sequentially arranged, wherein the left end and the right end of the first pumping mirror are respectively opposite to a pumping source and a first gain medium inlet on the first gain medium, and the first partial reflector is opposite to a first gain medium outlet on the first gain medium, so that pumping light emitted by the pumping source enters the first gain medium through the first pumping mirror, amplified by the first gain medium and then transmitted to the first partial reflector.
SiO is sequentially laminated and wrapped on the outer side of the first gain medium 2 Crystal, au film and plastic housing, siO 2 Nanowires are mixed between the crystal and the Au thin film.
The second-stage laser amplification system comprises a second pumping mirror, a second gain medium and a second partial reflector which are sequentially arranged, wherein the left end and the right end of the second pumping mirror are respectively opposite to the first partial reflector and a second gain medium inlet on the second gain medium, and the second partial reflector is opposite to a second gain medium outlet on the second gain medium, so that a first gain laser beam amplified by the first-stage laser amplification system enters the second gain medium through the second pumping mirror and is amplified by the second gain medium and then is transmitted to the second partial reflector.
Further, a first collimating mirror is arranged between the first partial reflecting mirror and the second pumping mirror, and the first gain laser beam transmitted from the first partial reflecting mirror is collimated into parallel light.
Further, the right end of the second partial reflector is sequentially provided with a second collimating mirror and a focusing mirror, so that the second gain laser beam transmitted from the second partial reflector is collimated into parallel light by the second collimating mirror and then focused by the focusing mirror.
Further, the second gain medium is wrapped with a high-reflection film.
Further, the first gain medium is arranged in a first cooling box containing cooling liquid; the second gain medium is arranged in a second cooling box containing cooling liquid; any pair of diagonal corners of the first cooling box and the second cooling box are respectively provided with an inlet and an outlet for cooling liquid to enter and exit.
Further, the first gain medium is arranged in a coil shape.
Further, the first gain medium material is one of germanium doped quartz, ZBLAN fiber and sulfide.
Further, the nanowire is made of tungsten diselenide; the plastic housing may be of a thermally conductive material.
Further, the second gain medium is made of one of ND, YAG, yb, S-FAP and Yb, and the ND is LuAG ceramic, ND, caF, YAG.
Further, the cooling liquid is one of glycerin type cooling liquid, glycol type cooling liquid and water.
Further, the first gain medium inlet end face forms an acute angle or an obtuse angle with the horizontal plane; the inlet end face of the second gain medium forms an acute or obtuse included angle with the horizontal plane.
Further, a certain distance is arranged between the first collimating mirror and the first partial reflecting mirror; and the second gain medium longitudinal cross-sectional area is greater than the first gain medium longitudinal cross-sectional area.
Further, the longitudinal section of the first gain medium is circular; the second gain medium has a longitudinal section in one of a circle, a square and a rectangle.
The wavelength-adjustable multi-medium efficient laser amplification method adopts the wavelength-adjustable multi-medium efficient laser amplification device and comprises the following specific steps:
s1, determining SiO according to the requirement of the wavelength of the laser beam with the first gain 2 Film thickness ratio K of crystal and Au film, and SiO 2 The crystal, the Au film and the plastic shell are sequentially stacked to wrap the first gain medium, and SiO 2 Nanowires are mixed between the crystal and the Au thin film;
s2, placing the wrapped first gain medium in a first cooling box;
s3, selecting a corresponding second gain medium according to the wavelength of the first gain laser beam, and wrapping a high-reflection film outside the second gain medium;
s4, placing the wrapped second gain medium in a second cooling box;
s5, adding cooling liquid at the inlets of the first cooling box and the second cooling box, so that the first cooling box and the second cooling box are filled with flowing cooling liquid;
s6, controlling the pump source to emit pump light, and enabling the pump light to be amplified by the primary laser amplifying system and the secondary laser amplifying system in sequence and then emitted to the target object from the focusing mirror;
s7, turning off all the devices after finishing, and turning off the power supply.
The beneficial effects of the invention are as follows:
the laser amplifying device can be prepared by selecting proper SiO 2 The film thickness ratio K of the crystal and the Au film regulates and controls the burst-Moss effect, so that the laser wavelength is tuned, and the nanowire is used for enhancing the burst-Moss effect, so that the laser wavelength can be better tuned; specifically, through the mutual coupling action of the plasmons between the SiO2 crystal reinforced by the nano wire and the film of the Au film and the excitons of the first gain medium, the energy band distribution of the first gain medium can be finally changed, and the emission spectrum peak position, namely the center wavelength of laser output, is influenced. And meanwhile, according to the wavelength after tuning, a corresponding second gain medium is selected, so that a better effect can be achieved when the first gain laser beam amplified by the primary laser amplification system is amplified again.
According to the invention, the first gain medium inlet end face and the second gain medium inlet end face form an acute angle or an obtuse angle with the horizontal plane, and the Au thin film and the high-reflection film are matched for reflecting light, so that the light can be transmitted in the first gain medium and the second gain medium in a zigzag manner, the transmission distance of the light in the first gain medium and the second gain medium is greatly increased, and the amplification effect of the light is improved. The first partial reflector is matched with the first pumping mirror, and the second partial reflector is matched with the second pumping mirror, so that light can be amplified for multiple times in the first gain medium and the second gain medium, the amplifying effect of the light is greatly improved, and the high-efficiency amplification of the light is realized.
Drawings
FIG. 1 is a schematic diagram of a wavelength tunable multi-medium high efficiency laser amplifying device according to the present invention.
Fig. 2 is a longitudinal cross-sectional view of a first gain medium according to the present invention.
FIG. 3 is a schematic distribution diagram of nanowires according to the present invention.
Fig. 4 is a schematic diagram illustrating the propagation of pump light in a first gain medium according to the present invention.
In the figure, 1. Pump source, 2. Pump light, 3. First gain medium inlet, 4. First gain medium, 5. Cooling liquid, 6. First cooling tank inlet, 7. First collimating mirror, 8. Second pump mirror, 9. Second gain medium inlet, 10. High reflection film, 12. Second cooling tank inlet, 13. Second collimating mirror, 14. Focusing mirror, 15. First pump mirror, 16. First cooling tank outlet, 17. First cooling tank, 18. First gain medium outlet, 19. First partial mirror, 20. First gain laser beam, 21. Second cooling tank outlet, 22. Second gain medium, 23. Second cooling tank, 24. Second partial mirror, 25. Second gain laser beam, 26. Second gain medium outlet, 41.SiO2 crystal, 42. Nanowire, 43.Au thin film, 44. Plastic housing.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
The wavelength-adjustable multi-medium efficient laser amplification device disclosed by the invention, as shown in fig. 1, comprises a pumping source 1, a primary laser amplification system and a secondary laser amplification system which are sequentially arranged, wherein pumping light 2 emitted by the pumping source 1 is sequentially amplified by the primary laser amplification system and the secondary laser amplification system, so that laser output with high power and high beam quality is obtained.
The first-stage laser amplification system comprises a first pump mirror 15, a first gain medium 4 and a first partial reflector 19 which are sequentially arranged, wherein the left end and the right end of the first pump mirror 15 are respectively opposite to the pump source 1 and a first gain medium inlet 3 on the first gain medium 4, the first partial reflector 19 is opposite to a first gain medium outlet 18 on the first gain medium 4, so that pump light 2 emitted by the pump source 1 enters the first gain medium 4 through the first pump mirror 15, and is amplified by the first gain medium 4 and then transmitted to the first partial reflector 19. The first gain medium 4 is made of one of germanium doped quartz, ZBLAN fiber and sulfide, and can amplify the pump light 2 emitted by the pump source 1. The first pump mirror 15 is capable of fully transmitting the pump light 2 from the pump source 1, and exhibits total reflection for light directed to the first pump mirror 15 in the reflection direction. The first partial reflector 19 reflects the pump light 2 amplified by the first gain medium 4 into the first gain medium 4, and amplifies the pump light again by the first gain medium 4 and emits the pump light to the first pump mirror 15, and the first pump mirror 15 reflects the light reflected in the reflecting direction into the first pump mirror, so that part of the pump light 2 can be amplified in the first gain medium 4 for multiple times until the amplification threshold of the first gain medium 4 is reached.
As shown in fig. 2-3, the longitudinal section of the first gain medium 4 is circular, and the outside of the first gain medium 4 is sequentially laminated and wrapped with SiO 2 Crystal 41, au film 43 and plastic housing 44, siO 2 The nano wire 42 is mixed between the crystal 41 and the Au film 43 by selecting proper SiO 2 The film thickness ratio K of the crystal and the Au film regulates the burst-Moss effect, thereby tuning the laser wavelength; the nanowire 42 is used to enhance the burst-Moss effect, thereby enabling better tuning of the laser wavelength; specifically, through the mutual coupling interaction between the film plasmons of the SiO2 crystal reinforced by the nano wire 42 and the Au thin film and the excitons of the first gain medium 4, the energy band distribution of the first gain medium 4 can be finally changed, and the emission spectrum peak position, namely the center wavelength of the laser output, is influenced. The nanowire 42 is made of tungsten diselenide. Referring to fig. 4, the end face of the first gain medium inlet 3 forms an acute angle or an obtuse angle with the horizontal plane, that is, the end face of the first gain medium inlet 3 is inclined with respect to the horizontal plane, so that after the horizontal pump light 2 enters the first gain medium 4, the pump light 2 is refracted, and the Au film 43 can reflect the pump light 2, so that the pump light 2 propagates in a zigzag manner when propagating in the first gain medium 4, the propagation distance of the pump light 2 in the first gain medium 4 is greatly increased, and the first gain medium is improvedThe amplification effect of the pump light 2 by the mass 4. The first gain medium 4 is arranged in a coil shape, so that the propagation distance of the pump light 2 in the first gain medium 4 is increased, and the pump light 2 can achieve better amplification effect. The first gain medium 4 is arranged in a first cooling tank 17 containing cooling liquid 5, a first cooling tank inlet 6 is arranged at the right upper corner of the first cooling tank 17, and a first cooling tank outlet 16 is arranged at the left lower corner of the first cooling tank 17, so that the cooling liquid 5 in the whole first cooling tank 17 is in a flowing state, and the cooling effect is enhanced; the cooling liquid 5 is one of glycerin-type cooling liquid, glycol-type cooling liquid and water, and is used for cooling the first gain medium 4, so as to avoid heat influence on unstable change of material properties and wavelength of the first gain medium 4. The plastic housing 44 is a heat conductive material for isolating the Au thin film 43 from the cooling liquid 5 and for heat exchange between the cooling liquid 5 and the first gain medium 4, the SiO2 crystal 41, the Au thin film 43.
The second-stage laser amplification system comprises a second pump mirror 8, a second gain medium 22 and a second partial reflector 24 which are sequentially arranged, wherein the left end and the right end of the second pump mirror 8 are respectively opposite to a first partial reflector 19 and a second gain medium inlet 9 on the second gain medium 22, the second partial reflector 24 is opposite to a second gain medium outlet 26 on the second gain medium 22, so that a first gain laser beam 20 amplified by the first-stage laser amplification system enters the second gain medium 22 through the second pump mirror 8, is amplified by the second gain medium 22 and then is transmitted to the second partial reflector 24. A first collimator lens 7 is provided between the first partial mirror 19 and the second pump mirror 8, and collimates the first gain laser beam 20 transmitted from the first partial mirror 19 into parallel light. A certain distance is arranged between the first collimating mirror 7 and the first partial reflecting mirror 19, which is used for expanding the first gain laser beam 20 amplified by the primary laser amplifying system, so that the situation that the energy of the first gain laser beam 20 is too concentrated to hurt the second gain medium 22 is avoided, and the longitudinal section area of the second gain medium 22 is larger than the longitudinal section area of the first gain medium 4, so that the expanded first gain laser beam 20 can completely enter the second gain medium 22.
The second gain medium 22 is made of one of ND LuAG ceramic, ND CaF2 crystal, ND YAG crystal, yb S-FAP crystal and Yb YAG, and is used for amplifying the first gain laser beam 20 amplified by the first-stage laser amplifying system again, and the material of the corresponding second gain medium 22 can be selected according to the wavelength of the first gain laser beam 20. The second gain medium 22 is arranged in a second cooling tank 23 containing cooling liquid 5; the upper right corner of the second cooling box 23 is provided with a second cooling box inlet 12, and the lower left corner is provided with a second cooling box outlet 21, so that the cooling liquid 5 in the whole second cooling box 23 is in a flowing state, and the cooling effect is enhanced; the cooling liquid 5 is one of glycerin-type cooling liquid, glycol-type cooling liquid and water, and is used for cooling the second gain medium 22, so as to avoid heat affecting unstable changes of material properties and wavelengths of the second gain medium 22. The longitudinal section of the second gain medium 22 is one of a circle, a square and a rectangle, and the high-reflection film 10 is wrapped outside the second gain medium 22, so that the second gain medium 22 and the cooling liquid 5 in the second cooling box 23 are isolated, and light can be reflected. The end face of the second gain medium inlet 9 forms an acute angle or an obtuse angle with the horizontal plane, namely, the end face of the second gain medium inlet 9 is obliquely arranged relative to the horizontal plane, so that the first gain laser beam 20 collimated by the first collimating mirror 7 horizontally enters the second gain medium inlet 9, the first gain laser beam 20 is refracted, and the reflection of the high reflection film 10 on the first gain laser beam 20 is matched, so that the first gain laser beam 20 propagates in a zigzag manner when the second gain medium 22 propagates, the propagation distance of the first gain laser beam 20 in the second gain medium 22 is greatly increased, and the amplification effect of the second gain medium 22 on the first gain laser beam 20 is improved. The second collimating mirror 13 and the focusing mirror 14 are sequentially disposed at the right end of the second partial reflecting mirror 24, so that the second gain laser beam 25 transmitted from the second partial reflecting mirror 24 is collimated into parallel light by the second collimating mirror 13, focused by the focusing mirror 14, and emitted from the focusing mirror 14 to the target object.
A wavelength-adjustable multi-medium efficient laser amplification method comprises the following steps:
s1, determining a film thickness ratio K of a SiO2 crystal 41 and an Au thin film 43 according to the wavelength requirement of a required first gain laser beam 20, sequentially laminating and packaging the SiO2 crystal 41, the Au thin film 43 and a plastic shell 44 to form a first gain medium 4, and mixing a nanowire 42 between the SiO2 crystal 41 and the Au thin film 43;
s2, placing the wrapped first gain medium 4 in a first cooling box 17;
s3, selecting a corresponding second gain medium 22 according to the wavelength of the first gain laser beam 20, and wrapping the high-reflection film 10 outside the second gain medium 22;
s4, placing the wrapped second gain medium 22 in a second cooling box 23;
s5, adding cooling liquid 5 at inlets of the first cooling box 17 and the second cooling box 23, and filling the first cooling box 17 and the second cooling box 23 with the flowing cooling liquid 5;
s6, controlling the pump source 1 to emit pump light 2, and enabling the pump light 2 to be amplified by the primary laser amplifying system and the secondary laser amplifying system in sequence and then emitted to the target object from the focusing mirror 14;
s7, turning off all the devices after finishing, and turning off the power supply.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.
Claims (10)
1. The wavelength-adjustable multi-medium efficient laser amplification device is characterized by comprising a pumping source (1), a primary laser amplification system and a secondary laser amplification system which are sequentially arranged;
the first-stage laser amplification system comprises a first pumping mirror (15), a first gain medium (4) and a first partial reflector (19) which are sequentially arranged, wherein the left end and the right end of the first pumping mirror (15) are respectively opposite to a pumping source (1) and a first gain medium inlet (3) on the first gain medium (4), and the first partial reflector (19) is opposite to a first gain medium outlet (18) on the first gain medium (4), so that pumping light (2) emitted by the pumping source (1) enters the first gain medium (4) through the first pumping mirror (15) and is amplified by the first gain medium (4) and then transmitted to the first partial reflector (19);
first oneSiO is sequentially laminated and wrapped on the outer side of the gain medium (4) 2 Crystal (41), au film (43) and plastic housing (44), siO 2 Nanowires (42) are mixed between the crystal (41) and the Au thin film (43);
the second-stage laser amplification system comprises a second pumping mirror (8), a second gain medium (22) and a second partial reflector (24) which are sequentially arranged, wherein the left end and the right end of the second pumping mirror (8) are respectively opposite to a first partial reflector (19) and a second gain medium inlet (9) on the second gain medium (22), the second partial reflector (24) is opposite to a second gain medium outlet (26) on the second gain medium (22), so that a first gain laser beam (20) amplified by the first-stage laser amplification system enters the second gain medium (22) through the second pumping mirror (8), and is amplified by the second gain medium (22) and then is transmitted to the second partial reflector (24).
2. The wavelength-tunable multi-medium high-efficiency laser amplification device according to claim 1, wherein a first collimating mirror (7) is disposed between the first partial reflecting mirror (19) and the second pumping mirror (8), and the first gain laser beam (20) transmitted from the first partial reflecting mirror (19) is collimated into parallel light;
the right end of the second partial reflector (24) is sequentially provided with a second collimating mirror (13) and a focusing mirror (14), so that the second gain laser beam (25) transmitted from the second partial reflector (24) is collimated into parallel light by the second collimating mirror (13) and then focused by the focusing mirror (14).
3. The wavelength-tunable multi-medium high-efficiency laser amplification device according to claim 1, wherein the second gain medium (22) is wrapped with a high-reflection film (10) outside.
4. The wavelength-tunable multi-medium high-efficiency laser amplification device according to claim 1, wherein the first gain medium (4) is disposed in a first cooling tank (17) containing a cooling liquid (5);
the second gain medium (22) is arranged in a second cooling box (23) containing cooling liquid (5);
any pair of diagonal angles on the first cooling box (17) and the second cooling box (23) are respectively provided with an inlet and an outlet for cooling liquid (5) to enter and exit.
5. The wavelength tunable multi-medium high efficiency laser amplification apparatus according to claim 1, wherein the first gain medium (4) is arranged in a coil shape.
6. The wavelength-adjustable multi-medium efficient laser amplification device according to claim 1, wherein the first gain medium (4) is one of germanium-doped quartz, ZBLAN fiber and sulfide;
the nanowire (42) is made of tungsten diselenide;
the plastic housing (44) is a thermally conductive material;
the second gain medium (22) is made of one of ND, caF2 crystal, ND YAG crystal, yb, S-FAP crystal and Yb YAG;
the cooling liquid (5) is one of glycerol type cooling liquid, glycol type cooling liquid and water.
7. The wavelength-tunable multi-medium high-efficiency laser amplification device according to claim 1, wherein the end surface of the first gain medium inlet (3) forms an acute or obtuse included angle with a horizontal plane;
the end face of the second gain medium inlet (9) forms an acute angle or an obtuse angle with the horizontal plane.
8. The wavelength-tunable multi-medium high-efficiency laser amplification device according to claim 2, wherein a distance is provided between the first collimating mirror (7) and the first partial reflecting mirror (19); and the second gain medium (22) has a longitudinal cross-sectional area greater than that of the first gain medium (4).
9. The wavelength-tunable multi-medium high-efficiency laser amplification apparatus according to claim 1, wherein the first gain medium (4) has a circular longitudinal cross-sectional shape; the second gain medium (22) has one of a circular shape, a square shape and a rectangular shape in longitudinal section.
10. A wavelength-adjustable multi-medium efficient laser amplification method, which is characterized by adopting the wavelength-adjustable multi-medium efficient laser amplification device according to any one of claims 1-9, and comprising the following specific steps:
s1, determining SiO according to the wavelength requirement of a first gain laser beam (20) 2 Film thickness ratio K of crystal (41) and Au thin film (43), and SiO 2 The crystal (41), the Au film (43) and the plastic housing (44) are sequentially stacked to wrap the first gain medium (4), and SiO 2 Nanowires (42) are mixed between the crystal (41) and the Au thin film (43);
s2, placing the wrapped first gain medium (4) in a first cooling box (17);
s3, selecting a corresponding second gain medium (22) according to the wavelength of the first gain laser beam (20), and wrapping a high-reflection film (10) outside the second gain medium (22);
s4, placing the wrapped second gain medium (22) in a second cooling box (23);
s5, adding cooling liquid (5) at the inlets of the first cooling box (17) and the second cooling box (23), and filling the first cooling box (17) and the second cooling box (23) with the flowing cooling liquid (5);
s6, controlling the pump source (1) to emit pump light (2), and enabling the pump light (2) to irradiate the target object from the focusing mirror (14) after being amplified by the primary laser amplifying system and the secondary laser amplifying system in sequence;
s7, turning off all the devices after finishing, and turning off the power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310843409.9A CN116845686A (en) | 2023-07-11 | 2023-07-11 | Wavelength-adjustable multi-medium efficient laser amplification device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310843409.9A CN116845686A (en) | 2023-07-11 | 2023-07-11 | Wavelength-adjustable multi-medium efficient laser amplification device and method |
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| CN116845686A true CN116845686A (en) | 2023-10-03 |
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| CN202310843409.9A Pending CN116845686A (en) | 2023-07-11 | 2023-07-11 | Wavelength-adjustable multi-medium efficient laser amplification device and method |
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