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Chinese Optics Letters

Chinese Optics Letters


  • Editor: Zhizhan Xu
  • Vol. 10, Iss. 12 — Dec. 1, 2012
  • pp: 121201–121201

Phase invariance in a recently proposed common-path laser interferometer

Can Feng, Lifeng Li, and Lijiang Zeng  »View Author Affiliations

Chinese Optics Letters, Vol. 10, Issue 12, pp. 121201-121201 (2012)

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This study shows that the principle of a recently proposed common-path laser interferometer containing a planar grating is nonexistent and apparently caused by a mathematical derivation error. Both p- and s-polarized beams in the proposed setup experience once the +1st-order diffraction and once the -1st-order diffraction by the grating. As a result, the phase of each beam remains unchanged and the interference fringes formed by the two beams are not expected to move when the grating is translated in the grating vector direction. We perform an experiment to confirm this prediction. Both our analysis and experimental observation cast doubt on the experimental results of the authors who proposed the interferometer.

© 2012 Chinese Optics Letters

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(230.1950) Optical devices : Diffraction gratings
(280.3340) Remote sensing and sensors : Laser Doppler velocimetry

ToC Category:
Instrumentation, Measurement, and Metrology

Can Feng, Lifeng Li, and Lijiang Zeng, "Phase invariance in a recently proposed common-path laser interferometer," Chin. Opt. Lett. 10, 121201-121201 (2012)

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  1. X. Qu, L. Wang, and Y. Fu, Opt. Lett. 34, 3809 (2009).
  2. L. Wang, Shanghai Meas. Test. 36, 2 (2009).
  3. X. Qu and L. Wang, Chin. J. Sci. Instrum. (in Chinese) 31, 1276 (2010).
  4. L. Li, Opt. Commun. 114, 406 (1995).

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