中国物理B ›› 2005, Vol. 14 ›› Issue (10): 1984-1989.doi: 10.1088/1009-1963/14/10/011

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

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

刘刚, 张书练, 李岩, 朱钧   

  1. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University,Beijing 100084, China
  • 收稿日期:2005-03-09 修回日期:2005-06-03 出版日期:2005-10-20 发布日期:2005-10-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60437030).

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)   

  1. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University,Beijing 100084, China
  • Received:2005-03-09 Revised:2005-06-03 Online:2005-10-20 Published:2005-10-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60437030).

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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 nm, and the sensor can discriminate the target's moving direction easily.

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.

Key words: dual-frequency laser, optical feedback, self-mixing, displacement sensor

中图分类号:  (Modulation, tuning, and mode locking)

  • 42.60.Fc
42.25.Lc (Birefringence)