摘要
采用步进电机控制光栅角度,对Ф200μm和Ф600μm圆柱透镜准直的体布拉格光栅(VBG)外腔单管C封装半导体激光器进行了系统研究。实验结果表明:激光二极管(LD)驱动电流越大,准直效果越好,VBG的角度调整容差越小;快轴方向的准直效果越好,慢轴方向的光栅调节角度容差越大;对于衍射效率28%、厚1.4mm的光栅,LD快轴发散角为7.3mrad时,快轴方向的角度容差不大于3.2mrad,慢轴方向的角度容差较快轴大约一个数量级。
For high power linewidth-narrowed diode lasers, it＇s important to study rotation angle tolerance of the volume Bragg grating （VBG） for narrowing the spectral linewidth of two dimensional diode laser stacks. The diode laser with the VBG＇ s external cavity and C-mounted modules is collimated by Ф200 μm and Ф600 μm cylindrical lens separately in the paper. The VBG＇s angle tolerance is acquired by two stepper motors. According to the research, more accuracy is needed for the VBG＇s ad- justment with higher driving current and better beam collimation. If the laser diode is collimated better in fast axis direction, rota tion angle tolerance in slow axis direction will be bigger. When a VBG with a diffraction efficiency of 28G and thickness of 1.4 mm is used to lock the wavelength of a laser diode with a fast axis divergence angle of 7.3 mrad, the grating＇s rotation angle tol- erance is no more than 3.2 mrad in the fast axis direction and that for the slow axis direction is one order of magnitude bigger.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第2期310-314,共5页
High Power Laser and Particle Beams
基金
中国科学院电子学研究所创新研究基金项目(5090-03)
