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Applied Optics

Applied Optics


  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 34 — Dec. 1, 2005
  • pp: 7287–7294

In-line interferometer for direction-sensitive displacement measurements by optical feedback detection

Alvarado Tarun, Julius Jecong, and Caesar Saloma  »View Author Affiliations

Applied Optics, Vol. 44, Issue 34, pp. 7287-7294 (2005)

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We demonstrate a compact in-line interferometer for direction-sensitive displacement measurement by optical feedback detection with a semiconductor laser (SL) light source. Two reflected beams from a semitransparent reference mirror and a reflecting test object interfere in the SL medium, causing a variation in its output power. The reference mirror is located between the SL output facet and the test object. The performance of the interferometer is investigated numerically and experimentally to determine its optimal operating conditions. We have verified the operating conditions where the behavior of the SL output power profile could indicate accurately the displacement magnitude and direction of the moving test object. The profile behavior is robust against variations in optical feedback and scale of the interferometer configuration.

© 2005 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis
(140.5960) Lasers and laser optics : Semiconductor lasers

ToC Category:

Original Manuscript: May 3, 2005
Manuscript Accepted: June 9, 2005
Published: December 1, 2005

Alvarado Tarun, Julius Jecong, and Caesar Saloma, "In-line interferometer for direction-sensitive displacement measurements by optical feedback detection," Appl. Opt. 44, 7287-7294 (2005)

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