基于Mini-bar叠阵的百瓦级光栅-外腔光谱合束半导体激光光源  

Hundred-watt Level Spectral Beam Combining Diode Laser Source Based on Mini-Bar Stack

作　　者：谭昊[1,2] 孟慧成 余俊宏[1,2] 杜维川[1,2] 王昭[1,2] 郭林辉[1,2] 田飞[1,2] 卢飞[1,2] 李建民[1,2] 高松信[1,2] 武德勇[1,2] 

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]中国工程物理研究院高能激光科学与技术重点实验室,四川绵阳621900

出　　处：《光学学报》2015年第11期206-211,共6页Acta Optica Sinica

基　　金：中国工程物理研究院高能激光科学与技术重点实验室基金(HEL2015-05)

摘　　要：半导体激光器光栅-外腔光谱合束是一种实现高亮度半导体激光(DL)输出的有效方法。本文采用mini-bar叠阵作为合束光源,有效减小了"smile"效应对合束效率的影响,匀化了合束后的快慢轴光束质量,便于进一步的光纤耦合输出。采用柱面镜作为外腔镜,有效抑制了合束中的互锁定现象,从而取代了传统的空间滤波,减小了系统规模。在工作电流为75A时得到了159W的高亮度DL输出,合束光谱宽度为11.97 nm,电光效率为47.35%。当工作电流为60A时,合束光的快慢轴光束质量分别为3.145 mm·mrad与3.554 mm·mrad。Spectral beam combining is an effective way to realize high brightness direct semiconductor laser output. A hundred watt level spectral beam combining scheme based on mini-bar stack is demonstrated. Due to the lower ＂smile＂ effect of mini-bar and equal beam quality in both axis of mini-bar stacks, this mini-bar stack based spectral beam combining scheme have more effective optical feedback compared to the standard cm-bar based spectral beam combining scheme. A cylindrical mirror as the output mirror to restrain the cross-talk between emitters is utilized instead of using a traditional spatial filter, which will also lower the system size. A spectral beam combining output of 159 W is achieved, with an electro-optical efficiency of 47.35% and spectral width of 11.97 nm. At the operating current of 60A, the beam quality of 3.145 mm · mrad （fast axis） and 3.554 mm · mrad （slow axis） is demonstrated by spectral beam combining.

关 键 词：激光器 半导体激光器 光谱合束 外腔 光栅 

分 类 号：O439[机械工程—光学工程]