国产Yb∶YAG薄片再生放大器输出功率突破300 W  

Output Power of Domestic Yb∶YAG Thin-Disk Regenerative Amplifier Exceeding 300 W

作　　者：雷希音 戴隆辉 苏盟 刘锐[1] 李想 滕飞[1] 吕起鹏[1] 李刚[1] 金玉奇[1] Lei Xiyin;Dai Longhui;Su Meng;Liu Rui;Li Xiang;Teng Fei;LüQipeng;Li Gang;Jin Yuqi(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Superwave Technology Co.Ltd.,Beijing 100049,China)

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学,北京100049 [3]北京盛镭科技有限公司,北京100049

出　　处：《中国激光》2024年第19期296-299,共4页Chinese Journal of Lasers

基　　金：大连化物所创新重点基金项目(DICPI202333);深圳市创新创业计划科技重大专项项目(重202309D333);中国科学院国防科技重点实验室基金项目(CXJJ-22S010)。

摘　　要：基于自主研制的Yb∶YAG 72通薄片泵浦模块设计并搭建了薄片再生放大器,实现了重复频率在50~200 kHz可调、输出功率为312 W、脉冲宽度为720 ps、最大脉冲能量超过6 mJ的近衍射极限激光输出,x方向和y方向的光束质量因子分别为1.05和1.09,近场激光光斑圆度为91%,光-光转换效率高达48.1%。输出激光的中心波长为1030.8 nm,光谱宽度为1.80 nm,该光谱宽度可支持将脉宽压缩至867 fs。据查,这是国内首次使用国产多通薄片模块和自主封装薄片晶体实现的重复频率为50 kHz、平均功率超过300 W、光-光转换效率超过48%的皮秒激光输出。Objective Kilowatt-level high-repetition-frequency picosecond lasers are widely used in fields such as free-electron lasers,attosecond science,and high-precision material processing.Currently,the average output power of commercial ultrafast lasers is on the order of hundreds of watts,and the pulse energy is on the order of tens of millijoules.However,some scientific and industrial applications require a higher average output power with high pulse energy.Thin-disk lasers have centimeter-level laser spots on the gain medium and low-thermal-distortion characteristics,thus rendering them ideal for achieving average power levels on the order of kilowatts and pulse energies on the order of millijoules.Methods Based on the 72-pass self-developed thin-disk pump module,a thin-disk regenerative amplifier with a large stable range was designed,thus allowing the regenerative amplification cavity to achieve favorable mode matching within the operation range.To avoid damage to key optical components,the thin-disk regenerative amplifier was designed based on chirped pulse-amplification technology.The experimental setup is shown in Fig.1.After injecting the seed laser,the high-voltage loading time of the Pockels cell or the number of round trips in the regeneration cavity was controlled,and a high-power picosecond laser output was obtained.Results and Discussions As shown in Fig.2(a),under a maximum continuous pump power of 650 W,a regenerative-amplifier laser output with an average power of 312 W and a repetition frequency of 50 kHz is obtained,which corresponds to an optical efficiency of 48.1%and a slope efficiency of 53.8%.The output pulse sequences at repetition rates of 50/100/200 kHz are shown in Fig.2(d);the RMS of the single-pulse energy is 0.5%at 50 kHz.The beam quality factor M2 at a maximum output power of 312 W is 1.05/1.09 and the near-field output laser spot roundness is 91%.Owing to the gain-narrowing effect,the spectral width of the amplified laser is 1.80 nm,which theoretically supports the compression of the p

关 键 词：薄片激光器 再生放大器 啁啾脉冲放大 高重复频率 

分 类 号：O436[机械工程—光学工程]