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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 16 — Aug. 3, 2009
  • pp: 13939–13945

Laser feedback interferometry based on phase difference of orthogonally polarized lights in external birefringence cavity

Yidong Tan, Shulian Zhang, and Yinan Zhang  »View Author Affiliations

Optics Express, Vol. 17, Issue 16, pp. 13939-13945 (2009)

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A simple and effective displacement sensor based on external birefringent feedback in Nd:YAG lasers is demonstrated. The measurement is based on the principle that, when linearly polarized light passes through the birefringent external cavity and then is fed back into laser resonator by external object, a phase difference is generated between laser sinusoidal-modulated intensities in the two orthogonal directions. These two sinusoidal intensities with λ/2 period can be subdivided to λ/8 after 4-fold evaluation. Moreover, the directional discrimination can be easily obtained according to the phase relationship between them. The chief advantages of the sensor are that it is compact, small size, flexible, low cost, and robust. Experimental results have shown that the standard deviation of displacement measurement is 0.093μm in a 7mm range and 0.34μm in a 20mm range.

© 2009 OSA

OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(140.3580) Lasers and laser optics : Lasers, solid-state
(260.1440) Physical optics : Birefringence
(260.3160) Physical optics : Interference

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: April 16, 2009
Revised Manuscript: June 28, 2009
Manuscript Accepted: July 5, 2009
Published: August 3, 2009

Yidong Tan, Shulian Zhang, and Yinan Zhang, "Laser feedback interferometry based on phase difference of orthogonally polarized lights in external birefringence cavity," Opt. Express 17, 13939-13945 (2009)

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