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Chin. Phys. B, 2012, Vol. 21(11): 114201    DOI: 10.1088/1674-1056/21/11/114201
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Laser feedback interferometer with oscillating feedback mirror

Wang Zhi-Guo (汪之国), Wang Fei (王飞), Xiao Guang-Zong (肖光宗 )
Department of Optoelectronic Engineering, College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
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.
Keywords:  He-Ne laser      laser feedback interferometer      dithering  
Received:  08 March 2012      Revised:  04 May 2012      Accepted manuscript online: 
PACS:  42.25.Hz (Interference)  
  42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy)  
Corresponding Authors:  Wang Zhi-Guo     E-mail:  maxborn@nudt.edu.cn

Cite this article: 

Wang Zhi-Guo (汪之国), Wang Fei (王飞), Xiao Guang-Zong (肖光宗 ) Laser feedback interferometer with oscillating feedback mirror 2012 Chin. Phys. B 21 114201

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