基于半导体外腔激光器的光反馈研究  

Optical Feedback of Semiconductor External Cavity Laser

作　　者：龙睿[1] 王海龙[1] 龚谦[2] 宋志棠[2] 封松林[2] 

机构地区：[1]曲阜师范大学物理工程学院,山东曲阜273165 [2]中科院上海微系统与信息技术研究所,上海200050

出　　处：《通信技术》2013年第6期142-144,151,共4页Communications Technology

基　　金：国家自然科学基金项目(批准号:60976015);山东省自然科学基金项目(No.ZR2010FM023);信息功能材料国家重点实验室开放课题资助

摘　　要：以光栅外腔半导体激光器的理论知识为基础,对Littrow型的外腔半导体激光器的结构进行了说明。根据等效反射系数的概念,推导出外腔反馈作用下阈值增益的公式和线宽压窄公式,并详细地讨论了外腔半导体激光器的线宽压窄机制。同时,对影响Littrow型光栅外腔半导体激光器阈值增益和线宽压窄的各种因素进行了分析,发现外腔的反馈相当于增加了端面的反射率,阈值增益变小,在相同的输出功率下,增大受激辐射,抑制自发辐射,从而使线宽减小。Based on the theory of grating external cavity semiconductor lasers, the structure of Littrow-type external cavity semiconductor laser is described, the threshold gain of semiconductor lasers with external feedback calculated, and according to the definition of equivalent reflection factor, the linewidth reduction of the semiconductor external cavity laser discussed in detail. In addition, the influences of different factors on the threshold gain and linewidth reduction of the Littrow-type external cavity semiconductor lasers are numerically simulated, and it is found that the feedback of external cavity is equivalent to increasing the reflectivity of mirror and reducing the threshold gain. At the same output power, the linewidth decreases with the increase of stimulated emission and the suppression of spontaneous emission.

关 键 词：外腔激光器 稳定性 阈值增益 线宽 

分 类 号：TN243[电子电信—物理电子学] TN248