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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Anthony J. Campillo
  • Vol. 31, Iss. 6 — Mar. 15, 2006
  • pp: 826–828

Frequency-resolved coherent lidar using a femtosecond fiber laser

W. C. Swann and N. R. Newbury  »View Author Affiliations


Optics Letters, Vol. 31, Issue 6, pp. 826-828 (2006)
http://dx.doi.org/10.1364/OL.31.000826


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Abstract

We demonstrate a coherent lidar that uses a broadband femtosecond fiber laser as a source and resolves the returning heterodyne signal into N spectral channels by using an arrayed-waveguide grating. The data are processed incoherently to yield an N-times improvement in the Doppler measurement of a surface vibration. For N = 6 , we achieve a sensitivity of 153 Hz, corresponding to a 0.12 mm s motion, in 10 ms despite a signal that is speckle broadened to 14 kHz. Alternatively, the data are processed coherently to form a range image. For a flat target, we achieve a 60 μ m range resolution, limited mainly by the source bandwidth, despite the dispersion of 1 km of optical fiber in the signal path.

© 2006 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(140.3510) Lasers and laser optics : Lasers, fiber
(280.3640) Remote sensing and sensors : Lidar

ToC Category:
Remote Sensing

History
Original Manuscript: September 22, 2005
Manuscript Accepted: November 7, 2005

Citation
W. C. Swann and N. R. Newbury, "Frequency-resolved coherent lidar using a femtosecond fiber laser," Opt. Lett. 31, 826-828 (2006)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-31-6-826

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