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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 30 — Oct. 20, 2000
  • pp: 5512–5517

High-Accuracy Measurement of 240-m Distance in an Optical Tunnel by use of a Compact Femtosecond Laser

Kaoru Minoshima and Hirokazu Matsumoto  »View Author Affiliations


Applied Optics, Vol. 39, Issue 30, pp. 5512-5517 (2000)
http://dx.doi.org/10.1364/AO.39.005512


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Abstract

A high-accuracy optical distance meter with a mode-locked femtosecond laser is proposed for distance measurements in a 310-m-long optical tunnel. We measured the phase shift of the optical beat component between longitudinal modes of a mode-locked laser. A high resolution of 50 μm at 240-m distance was obtained without cyclic error correction. The group refractive index of air is automatically extracted to an accuracy of 6 parts per million (ppm) by two-color measurement with the pulses of fundamental and second-harmonic wavelengths. Finally, an absolute mechanical distance of 240 m was obtained to within 8-ppm accuracy by use of a series of beat frequencies with the advantage of a wide range of intermode frequency, together with the results of the two-color measurement.

© 2000 Optical Society of America

OCIS Codes
(140.3510) Lasers and laser optics : Lasers, fiber
(140.4050) Lasers and laser optics : Mode-locked lasers
(280.3400) Remote sensing and sensors : Laser range finder
(320.7160) Ultrafast optics : Ultrafast technology

Citation
Kaoru Minoshima and Hirokazu Matsumoto, "High-Accuracy Measurement of 240-m Distance in an Optical Tunnel by use of a Compact Femtosecond Laser," Appl. Opt. 39, 5512-5517 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-30-5512

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