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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 28, Iss. 8 — Aug. 1, 2011
  • pp: 1741–1746

Experimental comparison of autodyne and heterodyne laser interferometry using an Nd : YVO 4 microchip laser

Olivier Jacquin, Eric Lacot, Wilfried Glastre, Olivier Hugon, and Hugues Guillet de Chatellus  »View Author Affiliations


JOSA A, Vol. 28, Issue 8, pp. 1741-1746 (2011)
http://dx.doi.org/10.1364/JOSAA.28.001741


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Abstract

Using an Nd : YVO 4 microchip laser with a relaxation frequency in the megahertz range, we have experimentally compared a heterodyne interferometer based on a Michelson configuration with an autodyne interferometer based on the laser optical feedback imaging (LOFI) method regarding their signal-to-noise ratios. In the heterodyne configuration, the beating between the reference beam and the signal beam is realized outside the laser cavity, while in the autodyne configuration, the wave beating takes place inside the laser cavity, and the relaxation oscillations of the laser intensity then play an important part. For a given laser output power, object under investigation, and detection noise level, we have determined the amplification gain of the LOFI interferometer compared to the heterodyne interferometer. LOFI interferometry is demonstrated to show higher performance than heterodyne interferometry for a wide range of laser powers and detection levels of noise. The experimental results are in good agreement with the theoretical predictions.

© 2011 Optical Society of America

OCIS Codes
(280.3420) Remote sensing and sensors : Laser sensors
(110.3175) Imaging systems : Interferometric imaging

ToC Category:
Imaging Systems

History
Original Manuscript: May 10, 2011
Revised Manuscript: June 17, 2011
Manuscript Accepted: June 24, 2011
Published: July 28, 2011

Citation
Olivier Jacquin, Eric Lacot, Wilfried Glastre, Olivier Hugon, and Hugues Guillet de Chatellus, "Experimental comparison of autodyne and heterodyne laser interferometry using an Nd:YVO4 microchip laser," J. Opt. Soc. Am. A 28, 1741-1746 (2011)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-28-8-1741

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