Optical feedback characteristics in a dual-frequency laser during laser cavity tuning
Liu Gang (刘刚), Zhang Shu-Lian (张书练), Li Yan (李岩), Zhu Jun (朱钧)
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University,Beijing 100084, China
Abstract 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 nm, and the sensor can discriminate the target's moving direction easily.
Received: 09 March 2005
Revised: 03 June 2005
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 60437030).
Cite this article:
Liu Gang (刘刚), Zhang Shu-Lian (张书练), Li Yan (李岩), Zhu Jun (朱钧) Optical feedback characteristics in a dual-frequency laser during laser cavity tuning 2005 Chinese Physics 14 1984
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