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.
出处
《光学学报》
EI
CAS
CSCD
北大核心
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)
关键词
激光器
半导体激光器
光谱合束
外腔
光栅
lasers
semiconductor laser
spectral beam combining
external cavity
diffraction grating