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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 16 — Jun. 1, 2008
  • pp: 3027–3031

Radio frequency controlled synthetic wavelength sweep for absolute distance measurement by optical interferometry

Sébastien Le Floch, Yves Salvadé, Rostand Mitouassiwou, and Patrick Favre  »View Author Affiliations


Applied Optics, Vol. 47, Issue 16, pp. 3027-3031 (2008)
http://dx.doi.org/10.1364/AO.47.003027


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Abstract

We present a new technique applied to the variable optical synthetic wavelength generation in optical interferometry. It consists of a chain of optical injection locking among three lasers: first a distributed-feedback laser is used as a master to injection lock an intensity-modulated laser that is directly modulated around 15 GHz by a radio frequency generator on a sideband. A second distributed-feedback laser is injection locked on another sideband of the intensity-modulated laser. The variable synthetic wavelength for absolute distance measurement is simply generated by sweeping the radio frequency over a range of several hundred megahertz, which corresponds to the locking range of the two slave lasers. In this condition, the uncertainty of the variable synthetic wavelength is equivalent to the radio frequency uncertainty. This latter has a relative accuracy of 10 7 or better, resulting in a resolution of ± 25 μm for distances exceeding tens of meters. The radio frequency generator produces a linear frequency sweep of 1 ms duration (i.e., exactly equal to one absolute distance measurement acquisition time), with frequency steps of about 1 MHz . Finally, results of absolute distance measurements for ranges up to 10 m are presented.

© 2008 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(140.3520) Lasers and laser optics : Lasers, injection-locked

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: January 24, 2008
Revised Manuscript: April 21, 2008
Manuscript Accepted: May 5, 2008
Published: May 26, 2008

Citation
Sébastien Le Floch, Yves Salvadé, Rostand Mitouassiwou, and Patrick Favre, "Radio frequency controlled synthetic wavelength sweep for absolute distance measurement by optical interferometry," Appl. Opt. 47, 3027-3031 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-16-3027


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References

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