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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 12 — Jun. 15, 2013
  • pp: 2026–2028

Comb-calibrated frequency-modulated continuous-wave ladar for absolute distance measurements

Esther Baumann, Fabrizio R. Giorgetta, Ian Coddington, Laura C. Sinclair, Kevin Knabe, William C. Swann, and Nathan R. Newbury  »View Author Affiliations

Optics Letters, Vol. 38, Issue 12, pp. 2026-2028 (2013)

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We demonstrate a comb-calibrated frequency-modulated continuous-wave laser detection and ranging (FMCW ladar) system for absolute distance measurements. The FMCW ladar uses a compact external cavity laser that is swept quasi-sinusoidally over 1 THz at a 1 kHz rate. The system simultaneously records the heterodyne FMCW ladar signal and the instantaneous laser frequency at sweep rates up to 3400THz/s, as measured against a free-running frequency comb (femtosecond fiber laser). Demodulation of the ladar signal against the instantaneous laser frequency yields the range to the target with 1 ms update rates, bandwidth-limited 130 μm resolution and a 100nm accuracy that is directly linked to the counted repetition rate of the comb. The precision is <100nm at the 1 ms update rate and reaches 6nm for a 100 ms average.

OCIS Codes
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(140.3500) Lasers and laser optics : Lasers, erbium
(280.3640) Remote sensing and sensors : Lidar

ToC Category:
Lasers and Laser Optics

Original Manuscript: March 29, 2013
Manuscript Accepted: April 23, 2013
Published: June 4, 2013

Esther Baumann, Fabrizio R. Giorgetta, Ian Coddington, Laura C. Sinclair, Kevin Knabe, William C. Swann, and Nathan R. Newbury, "Comb-calibrated frequency-modulated continuous-wave ladar for absolute distance measurements," Opt. Lett. 38, 2026-2028 (2013)

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