CN-122000772-A - Large-caliber pulse laser amplification gain module

CN122000772ACN 122000772 ACN122000772 ACN 122000772ACN-122000772-A

Abstract

The application discloses a large-caliber pulse laser amplification gain module, which relates to the solid laser technology and comprises a fixed disc, a gain unit, a support, a rotary driving assembly, a main optical path and a timing control system, wherein the fixed disc is a disc with a plurality of through holes, the through hole is positioned in the center of the disc, the gain unit comprises a gain medium sheet and the support, the gain medium sheet is in a round or polygonal sheet shape, the support is in a barrel-shaped structure matched with the gain medium sheet in shape, an air vent is arranged around the support, the rotary driving assembly comprises a rotary shaft, a fixed bearing and a rotary driving source, the cooling system comprises an annular shell, a plurality of ventilation grooves are formed in the inner wall of the annular shell corresponding to a path through which each gain unit rotates, the main optical path comprises seed laser and pump light, and the timing control system is used for controlling the timing of the seed laser, the pump light and the rotary driving source. The embodiment of the application provides a novel large-caliber pulse laser amplification gain module by adopting a mode of separating and rotating a plurality of thin discs by tightly stacking the modules.

Inventors

CHEN SANBIN
TANG XIAOJUN

Assignees

中国电子科技集团公司第十一研究所

Dates

Publication Date: 20260508
Application Date: 20260129

Claims (9)

1. The large-caliber pulse laser amplification gain module is characterized by comprising a fixed disc, a gain unit, a rotary driving assembly, a main light path, a cooling system and a time domain controller; the fixed disc is a disc with a plurality of through holes, and one through hole is positioned in the center of the disc; the gain unit comprises a gain medium sheet and a bracket, wherein the gain medium sheet is in a circular or polygonal sheet shape; the bracket is of a barrel-shaped structure matched with the shape of the gain medium sheet and is used for supporting and fixing the gain medium sheet, and ventilation openings are formed around the bracket; the rotary driving assembly comprises a rotary shaft, a fixed bearing and a rotary driving source, The cooling system comprises an annular shell, and a plurality of ventilation grooves are formed in the inner wall of the annular shell corresponding to the paths through which each gain unit rotates; The main light path comprises seed laser and pump light, wherein the seed laser is pulse laser amplified by the gain medium module, and the pump light is semiconductor laser excited by the pump source to gain medium sheet; the time sequence control system is used for controlling the seed laser, the pump light and the control circuit system of the time sequence of the rotary driving source, and is used for synchronously controlling the starting of the pump source and the seed laser according to the rotary position of the gain medium unit on the fixed disc.
2. The large-caliber pulse laser amplification gain module according to claim 1, wherein the fixed disk is a ring plate, the shape and the size of the central hole are matched with those of the rotating shaft, and the rest through holes are hole sites for installing gain units and are uniformly distributed on the ring plate.
3. The large-caliber pulse laser amplification gain module according to claim 1, wherein the gain medium pieces are working substances for generating laser, and the number of the gain medium pieces is determined according to the correlation factor of the absorption condition of the medium pieces to pump light.
4. A large caliber pulsed laser amplification gain module according to claim 3, wherein the gain medium sheet is in the shape of a thin sheet with a thickness of the order of tens of millimeters, and both major surfaces of the gain medium sheet are coated with optical films having high transmittance to both pump light and laser light.
5. The large caliber pulsed laser amplification gain module of claim 1, wherein the bracket is open to facilitate smooth passage of air flow through the disc space, and one end of the bracket is abutted with a hole site of the gain unit on the fixed disc; The gain medium plates are installed in the bracket barrel at intervals, and the installed intervals are of the sub-millimeter magnitude.
6. The large-caliber pulse laser amplification gain module according to claim 1, wherein the rotating shaft is a finish machining shaft, is round or polygonal in shape and is precisely matched with the central hole of the fixed disc; the fixed bearing is a precision bearing, so that the swing of the fixed disc during rotation is controlled in a required range; The rotary driving source is a servo motor with precise controllable rotating speed or other precise driving sources.
7. The large caliber pulsed laser amplification gain module of claim 1, wherein a plurality of the vent grooves are used to direct cooling medium to the disc space.
8. The large caliber pulsed laser amplification gain module of claim 1, wherein the timing control system is specifically configured to make the pump light emitted by the pump source and the seed laser reasonably act and pass through the gain unit in time and space when the gain unit rotates to the main optical path region.
9. The large caliber pulsed laser amplification gain module of claim 7, wherein the cooling medium is a gas or a liquid.

Description

Large-caliber pulse laser amplification gain module Technical Field The application relates to the technical field of solid lasers, in particular to a large-caliber pulse laser amplification gain module. Background The large-caliber pulse laser amplification gain module is used as a core capacity amplification unit of a high-power laser system, and becomes a key supporting device in the fields of high-end industrial manufacturing, medical equipment and the like by virtue of high energy storage and peak power output capacity brought by a large-caliber gain medium, so that the large-caliber pulse laser amplification gain module is widely applied to the scenes of a 100 PW-level super-strong ultra-short laser device, a laser weapon, a proton therapy system, precise material processing and the like. Currently, the technical route of the module mainly develops around two core principles of Chirped Pulse Amplification (CPA) and Optical Parametric Chirped Pulse Amplification (OPCPA), and mainly adopts large-caliber crystals such as Nd, YAG, yd, YAG, LBO, DKDP and the like or large-mode-field optical fibers as gain media, so that the energy injection and pulse amplification of the array diode pump are realized. However, as the requirements of the application scenario on pulse energy (target hundred joules to kilojoules), peak power (pursuing clapping level breakthrough), beam quality (required M2 is less than or equal to 1.2), and repeated operation stability continue to increase, the existing large-caliber pulse laser amplification module still faces some core technical bottlenecks. For example, the thermal effect and nonlinear effect restrict performance improvement, the quantum defect generated in the high-power pumping process can cause the gain medium to accumulate a large amount of heat load, the heat dissipation path of the large-caliber gain medium is long, the heat diffusion efficiency is low, the thermal lens, the thermal distortion and even stress cracking are easy to be caused, the beam quality is seriously deteriorated, and meanwhile, the prior art has an obvious short plate on the heavy-frequency operation capability. OPCPA systems above the current level of berva are mostly single-pass modes of operation, with repetition frequencies generally below 1Hz. The front-end scientific research and industrial application need a module working at a repetition frequency of more than 1Hz, and the energy recovery speed of the existing pump source, the relaxation characteristic of the gain medium and the high-efficiency uniformity of the heat dissipation system cannot meet the requirements, so that the market application range of the module is limited. Disclosure of Invention The embodiment of the application provides a large-caliber pulse laser amplification gain module, which is used for providing a high-efficiency thermal management and high-reliability large-caliber pulse laser amplification gain module. The embodiment of the application provides a large-caliber pulse laser amplification gain module, which comprises a fixed disk, a gain unit, a rotary driving assembly, a main light path, a cooling system and a time domain controller, wherein the fixed disk is arranged on the fixed disk; the fixed disc is a disc with a plurality of through holes, and one through hole is positioned in the center of the disc; the gain unit comprises a gain medium sheet and a support, wherein the gain medium sheet is in a circular or polygonal sheet shape; The bracket is of a barrel-shaped structure matched with the shape of the gain medium sheet and is used for supporting and fixing the gain medium sheet, and ventilation openings are formed around the bracket; the rotary driving assembly comprises a rotary shaft, a fixed bearing and a rotary driving source, The cooling system comprises an annular shell, and a plurality of ventilation grooves are formed in the inner wall of the annular shell corresponding to the paths through which each gain unit rotates; The main light path comprises seed laser and pump light, wherein the seed laser is pulse laser amplified by the gain medium module, and the pump light is laser of a pump source for exciting the gain medium sheet; the time sequence control system is used for controlling the seed laser, the pump light and the control circuit system of the time sequence of the rotary driving source, and is used for synchronously controlling the starting of the pump source and the seed laser according to the rotary position of the gain medium unit on the fixed disc. The embodiment of the application provides a novel large-caliber pulse laser amplification gain module by adopting a mode of separating and rotating a plurality of thin discs by tightly stacking the modules. The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make