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Applied Optics

Applied Optics


  • Vol. 35, Iss. 34 — Dec. 1, 1996
  • pp: 6754–6761

Laser vibrometer based on optical-feedback-induced frequency modulation of a single-mode laser diode

P. A. Roos, M. Stephens, and C. E. Wieman  »View Author Affiliations

Applied Optics, Vol. 35, Issue 34, pp. 6754-6761 (1996)

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We describe a sensitive and inexpensive vibrometer based on optical feedback by diffuse scattering to a single-mode diode laser. Fluctuations in the diode laser’s operating frequency that are due to scattered light from a vibrating surface are used to detect the amplitude and frequency of surface vibrations. An additional physical vibration of the laser provides an absolute amplitude calibration. The fundamental bandwidth is determined by the laser response time of roughly 10−9 s. A noise floor of 0.23 nm/Hz1/2 at 30 kHz with 5 × 10−5 of the incident light returning is demonstrated. This instrument provides an inexpensive and sensitive method of noncontact measurement in solid materials with low or uneven reflectivity. It can be used as a vibration or velocity sensor.

© 1996 Optical Society of America

Original Manuscript: February 5, 1996
Revised Manuscript: April 12, 1996
Published: December 1, 1996

P. A. Roos, M. Stephens, and C. E. Wieman, "Laser vibrometer based on optical-feedback-induced frequency modulation of a single-mode laser diode," Appl. Opt. 35, 6754-6761 (1996)

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