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Applied Optics

Applied Optics


  • Vol. 37, Iss. 28 — Oct. 1, 1998
  • pp: 6684–6689

Absolute distance measurement with an optical feedback interferometer

Flore Gouaux, Noël Servagent, and Thierry Bosch  »View Author Affiliations

Applied Optics, Vol. 37, Issue 28, pp. 6684-6689 (1998)

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An important use of the self-mixing effect inside a frequency-modulated single-mode laser diode is in laser velocimetry and range-finding applications. The optical beam reflected by a target and injected into the laser diode cavity modulated by a reshaped current is mixed with the light inside the cavity, causing variations of the optical output power. A theoretical analysis of this effect is proposed, based on the determination of the beat frequencies of the optical power variations, to improve the accuracy of laser distance measurement. A resolution of ±1.5 mm from 50 cm to 2 m is obtained when thermal effects are taken into account.

© 1998 Optical Society of America

OCIS Codes
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.4630) Instrumentation, measurement, and metrology : Optical inspection
(130.6010) Integrated optics : Sensors
(150.5670) Machine vision : Range finding

Original Manuscript: March 31, 1998
Revised Manuscript: July 13, 1998
Published: October 1, 1998

Flore Gouaux, Noël Servagent, and Thierry Bosch, "Absolute distance measurement with an optical feedback interferometer," Appl. Opt. 37, 6684-6689 (1998)

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