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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 |
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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.
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Received: 08 March 2012
Revised: 04 May 2012
Accepted manuscript online:
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PACS:
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42.25.Hz
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(Interference)
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42.62.Eh
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(Metrological applications; optical frequency synthesizers for precision spectroscopy)
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Corresponding Authors:
Wang Zhi-Guo
E-mail: maxborn@nudt.edu.cn
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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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