中国激光, 2012, 39 (11): 1102006, 网络出版: 2012-09-26
长腔长体布拉格光栅外腔半导体激光器 下载: 527次
Laser Diode with Long External Cavity of Volume Bragg Grating
摘要
为了实现体布拉格光栅外腔半导体激光器(VBL)的外腔腔内光束合成,研究了长腔长VBL的激光输出特性。采用焦距为25 mm的平凸柱透镜作为单管激光二极管(LD)的慢轴准直镜,同时快轴方向体布拉格光栅(VBG)离轴放置,使得VBL的外腔腔长达到约240 mm,线宽从自由运转时的1.8 nm压窄至0.14 nm。在实验中,改变LD的偏振特性,VBL的激光输出特性不变。通过调节VBG温度,该长腔长VBL的激光中心波长从779.18 nm到779.75 nm连续可调,调谐过程中线宽基本不变。
Abstract
In order to achieve beam combination of volume Bragg grating diode lasers (VBLs) in the external cavity, characteristics of VBL with long cavity length is studied. A plane convex cylindrical lens with focal length of 25 mm is used to collimate the single emitter laser diode (LD) in slow axis direction. Meanwhile, volume Bragg grating (VBG) is positioned off-axis in fast axis of the LD. External cavity length of about 240 mm is established, and the linewidth is narrowed from 1.8 nm of free-running diode to 0.14 nm. In the experiment, characteristics of the VBL are unchanged for different polarizations of laser. By adjusting the VBG′s temperature, a tunable range from 779.18 nm to 779.75 nm of the VBL with long cavity length is realized while the linewidth remains the same.
李志永, 谭荣清, 黄伟, 徐程, 李琳. 长腔长体布拉格光栅外腔半导体激光器[J]. 中国激光, 2012, 39(11): 1102006. Li Zhiyong, Tan Rongqing, Huang Wei, Xu Cheng, Li Lin. Laser Diode with Long External Cavity of Volume Bragg Grating[J]. Chinese Journal of Lasers, 2012, 39(11): 1102006.