高功率分布反射式直接液冷薄片阵列激光放大设计与实验研究  

Design and Experimentation on a High-Power Direct-Liquid-Cooled Disk-Array Distributed-Reflective-Type Laser Amplification

作　　者：易家玉[1,2] 王君涛 周唐建[1,2] 尚建力 曹海霞[1,2] 涂波 高清松[1,2] Yi Jiayu;Wang Juntao;Zhou Tangjian;Shang Jianli;Cao Haixia;Tu Bo;Gao Qingsong(Institute of Applied Electronics,China Academy of Engineering Physics,Mianyang 621900,Sichuan,China;National Key Laboratory of Science and Technology on Advanced Laser and High Power Microwave,Mianyang 621900,Sichuan,China)

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900 [2]先进激光与高功率微波全国重点实验室,四川绵阳621900

出　　处：《中国激光》2025年第2期43-54,共12页Chinese Journal of Lasers

基　　金：国家自然科学基金(62105313)。

摘　　要：设计了一种分布反射式直接液冷激光放大构型,其采用数十片Nd∶YAG增益介质密集堆叠构成激光增益模块,通过特种冷却液在增益介质间平板微流道内的流动实现直接冷却,同时在增益模块中设计了类似Zig-Zag的放大路径,以实现激光放大输出。本设计效结合了直接液冷激光器高效冷却、无热沉焊接的特点以及Zig-Zag光路像差自补偿及高效提取激光的优势。对激光放大构型、增益介质参数、激光增益、热致波前等开展了理论仿真和分析。搭建了分布反射式直接液冷激光放大实验系统,实现了输出功率为21.2 kW、光光效率为36.9%、光束质量参数β为4.8倍衍射极限的准连续(QCW)线偏振激光输出。本研究验证了分布反射式直接液冷激光放大技术路线的可行性。Objective Solid-state lasers represent a class of compact and efficient high-power laser sources,which are attractive for a broad range of medical,commercial,scientific,and military applications.However,due to the risk of serious thermal optical aberration and fracture of the gain medium,thermal effects become the primary limiting factors in further increasing the output power and beam quality of the laser.To meet the requirements of various practical applications,a compact high-power system with efficient thermal management needs to be developed.Direct-liquid-cooled configuration lasers(DLCLs)have become highly attractive in the highpower laser field due to their excellent heat dissipation capabilities.Multiple disk pieces,arranged as an array,are integrated into a single gain module(GM),leading to a low heat density in each gain disk by dispersing the heat across the entire gain disk array.The circulating liquid flows over the largest surface of the disk,efficiently carrying away the heat.Thanks to easier laser output,DLCL resonators have been extensively studied.However,due to the repetitive superposition of complex wavefront aberrations in DLCL resonators—caused by the coolant flow and gain medium—the laser beam quality is compromised.To overcome the challenge of achieving both high power and good beam quality,new DLCL configurations must be explored.This study demonstrates a new DLCL scheme with high performance(high power,high beam quality,and high efficiency)referred to as the thermal-dispersed reflectivity-type Nd∶YAG disk array MOPA(master oscillator power-amplifier)laser.Methods This study employs a research method that combines configuration proposal,parameter design,and experimental integration verification.A novel high-power direct-liquid-cooled distributed-reflective-type laser is designed,featuring a distributed gain system composed of tens of Nd∶YAG disks densely stacked.A specialized laser cooling liquid flows through planar microchannels between the gain media disks.Additionally,a Zig-Za

关 键 词：激光器 固体激光 直接液冷 Zig-Zag光路 薄片激光器 

分 类 号：TN248.1[电子电信—物理电子学]