中国物理B ›› 2012, Vol. 21 ›› Issue (11): 114201-114201.doi: 10.1088/1674-1056/21/11/114201

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Laser feedback interferometer with oscillating feedback mirror

汪之国, 王飞, 肖光宗   

  1. Department of Optoelectronic Engineering, College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • 收稿日期:2012-03-08 修回日期:2012-05-04 出版日期:2012-10-01 发布日期:2012-10-01

Laser feedback interferometer with oscillating feedback mirror

Wang Zhi-Guo (汪之国), Wang Fei (王飞), Xiao Guang-Zong (肖光宗 )   

  1. Department of Optoelectronic Engineering, College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • Received:2012-03-08 Revised:2012-05-04 Online:2012-10-01 Published:2012-10-01
  • Contact: Wang Zhi-Guo E-mail:maxborn@nudt.edu.cn

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摘要： A method is proposed to solve the problem of direction discrimination for laser feedback interferometer. By vibrating the feedback mirror with a small-amplitude and high-frequency sine wave, laser intensity is modulated accordingly. The modulation amplitude can be extracted with a phase sensitive detector (PSD). When the feedback mirror moves, the PSD output shows a quasi-sine waveform similar to laser intensity interference fringe but with a phase difference of approximate ±π/2. If movement direction of the feedback mirror changes, the phase difference sign reverses. Therefore, the laser feedback interferometer offers a potential application in displacement measurement with a resolution of 1/8 wavelength and in-time direction discrimination. Without using optical components such as polarization beam splitter and wave plate, the interferometer is very simple, easy to align and less costly.

关键词: He-Ne laser, laser feedback interferometer, dithering

Abstract: A method is proposed to solve the problem of direction discrimination for laser feedback interferometer. By vibrating the feedback mirror with a small-amplitude and high-frequency sine wave, laser intensity is modulated accordingly. The modulation amplitude can be extracted with a phase sensitive detector (PSD). When the feedback mirror moves, the PSD output shows a quasi-sine waveform similar to laser intensity interference fringe but with a phase difference of approximate ±π/2. If movement direction of the feedback mirror changes, the phase difference sign reverses. Therefore, the laser feedback interferometer offers a potential application in displacement measurement with a resolution of 1/8 wavelength and in-time direction discrimination. Without using optical components such as polarization beam splitter and wave plate, the interferometer is very simple, easy to align and less costly.

Key words: He-Ne laser, laser feedback interferometer, dithering

中图分类号:  (Interference)

  • 42.25.Hz
42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy)