CN-116845686-B - Wavelength-adjustable multi-medium efficient laser amplification device and method

CN116845686BCN 116845686 BCN116845686 BCN 116845686BCN-116845686-B

Abstract

The invention provides a wavelength-adjustable multi-medium high-efficiency laser amplifying device and a method, the device comprises a pumping source, a primary laser amplifying system and a secondary laser amplifying 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, 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 reflector which are sequentially arranged, wherein the first gain laser beam enters the second gain medium through the second pumping mirror, is amplified by the second gain medium and is transmitted to the second partial reflector. The SiO 2 crystal, the Au thin film and the plastic shell are sequentially laminated and wrapped on the outer side of the first gain medium, nano wires are mixed between the SiO 2 crystal and the Au thin film, and the laser wavelength can be tuned by selecting a proper film thickness proportion K of the SiO 2 crystal and the Au thin film.

Inventors

ZHANG YUZE
REN XUDONG
Pan Eryi
TONG ZHAOPENG
Ge Yongzhou
YU TIANQI
YANG HAOJIE

Assignees

江苏大学

Dates

Publication Date: 20260512
Application Date: 20230711

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); The method comprises the steps that a SiO 2 crystal (41), an Au thin film (43) and a plastic shell (44) are sequentially laminated and wrapped on the outer side of a first gain medium (4), a nanowire (42) is mixed between the SiO 2 crystal (41) and the Au thin film (43), the laser wavelength is tuned by adjusting the film thickness proportion K of the SiO 2 crystal and the Au thin film, and the nanowire (42) is made of tungsten diselenide; 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 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 apparatus 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 larger longitudinal cross-sectional area than 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, and the second gain medium (22) has one of a circular, square, and rectangular longitudinal cross-sectional shape.
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 a film thickness proportion K of a SiO 2 crystal (41) and an Au thin film (43) according to the wavelength requirement of a first gain laser beam (20), sequentially laminating and packaging a first gain medium (4) by the SiO 2 crystal (41), the Au thin film (43) and a plastic shell (44), and mixing a nanowire (42) between the SiO 2 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.

Description

Wavelength-adjustable multi-medium efficient laser amplification device and method 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 efficient laser amplifying device and a wavelength-adjustable multi-medium efficient laser amplifying method, and the burst-Moss effect can be regulated and controlled by selecting a proper film thickness proportion K of SiO 2 crystals and Au films, so that the laser wavelength can be tuned. 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. The outer side of the first gain medium is sequentially laminated and wrapped with SiO 2 crystals, an Au film and a plastic shell, and nanowires are mixed between the SiO 2 crystals and the Au 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, and any pair of opposite angles on 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,