高光光效率百瓦级薄片再生放大器  

Hundred-Watt Thin-Disk Regenerative Amplifier with High Optical-to-Optical Efficiency

作　　者：李祖强 肖奇 潘雪[1] 卢兴华[1] 王江峰[1] 张生佳[1] 汪小超[1] 姜有恩[1] 范薇[1] 李学春[1] 朱健强[1] Li Zuqiang;Xiao Qi;Pan Xue;Lu Xinghua;Wang Jiangfeng;Zhang Shengjia;Wang Xiaochao;Jiang Youen;Fan Wei;Li Xuechun;Zhu Jianqiang(Key Laboratory of High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2024年第17期82-89,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(11604350);中国科学院战略性先导科技专项(XDA25020307,XDA25020103)。

摘　　要：基于粒子速率方程对单薄片结构的单程单通和单程双通再生放大器的动力学过程进行理论建模,基于Yb∶YAG单薄片激光模块设计并搭建了单程双通再生放大系统,在500 W连续泵浦功率下实现了重复频率为10 kHz、脉冲宽度为3.4 ns、平均功率为130 W的1030 nm单纵模激光输出,光光效率达26.0%,与单程单通薄片再生放大器13.3%的光光效率相比提高了近一倍,水平方向上的光束质量因子(M^(2)_(x))和竖直方向上的光束质量因子(M^(2)_(y))分别为1.20和1.15。在不采用主动反馈控制的情况下,3.5 h激光输出平均功率的峰谷(PV)值和均方根(RMS)值分别为5.77%和0.77%,优化后的薄片再生放大器的光光效率和输出功率稳定性大大提高。Objective In recent years,thin-disk lasers have been applied in various fields such as basic scientific research,industrial production,biomedicine,and defense.Owing to their significant advantages in terms of power scalability,thermal performance,and nonlinear effects,thin-disk lasers show promise for combining high average power and high peak power with excellent beam quality.Regenerative amplification is the technology that best suits thin disk lasers.The output power of the amplifier is increased by increasing gains and reducing the losses.Currently,regenerative amplifiers typically increase the gain by either enlarging the pump area or employing multiple thin-disk modules.However,in the former method,the amplified spontaneous emission(ASE)also increases simultaneously,whereas the latter method involves a more complex and uneconomical optical path.Double-pass regeneration is a promising technology in which a beam passes through a thin disk four times in a round trip,ultimately reducing the total loss by decreasing the number of round trips.In this study,we report a compact Yb∶YAG thin-disk double-pass regenerative amplifier.The amplifier has a maximum output power of 130 W and an optical-to-optical efficiency of 26%.Methods The thermal focal length of a thin-disk medium determines the mode distribution in the resonator cavity and should be measured before designing the cavity.Using a wavefront sensor based on the principle of four-wave lateral shearing interferometry,the thermal focal length is measured at various pump power levels.By applying the ABCD matrix theory,the optical resonator of the thin-disk regenerative amplifier is designed and optimized to ensure operation in the fundamental mode and insensitivity to cavity misalignment.The pulses are passed through the thin-disk medium twice at intervals longer than the pulse width.Additionally,the beam diameters in the medium are similar.The optical layout of the thin-disk double-pass regenerative amplifier is shown in Fig.1.It includes a seed laser with a

关 键 词：激光器 薄片激光器 再生放大器 单程双通放大 光光效率 

分 类 号：TN248.1[电子电信—物理电子学]