Optical feedback characteristics in a dual-frequency laser during laser cavity tuning

作     者：刘刚 张书练 李岩 朱钧 

作者机构：State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing 100084 China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2005年第14卷第10期

页      面：1984-1989页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 60437030) 

主　　题：dual-frequency laser optical feedback self-mixing displacement sensor 

摘      要：The optical feedback characteristics in a Zeeman-birefringence dual-frequency laser are studied during the laser cavity tuning in three different kinds of optical feedback conditions： （i） only //-light is fed back; （ii） only ⊥-light is fed back; （iii） both lights are fed back. A compact displacement sensor is designed using the experimental result that there is a nearly 90 degrees phase delay between the two lights＇ cosine optical feedback signals when both lights are fed back into the laser cavity. The priority order that the two lights＇ intensity curves appear can be used for direction discrimination. The resolution of the displacement sensor is at least 79 rim, and the sensor can discriminate the target＇s moving direction easily.