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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 18 — Aug. 27, 2012
  • pp: 20255–20265

Dual-frequency laser Doppler velocimeter for speckle noise reduction and coherence enhancement

Chih-Hao Cheng, Chia-Wei Lee, Tzu-Wei Lin, and Fan-Yi Lin  »View Author Affiliations

Optics Express, Vol. 20, Issue 18, pp. 20255-20265 (2012)

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We study the characteristics of a dual-frequency laser Doppler velocimeter (DF-LDV) based on an optically injected semiconductor laser. The laser operated in a period-one (P1) dynamical state with two optical frequencies separated by 11.25 GHz is used as the dual-frequency light source. With a microwave beat signal carried by the light, the DF-LDV possesses both the advantages of good directionality, high intensity, and high spatial resolution from the light and low speckle noise and good coherence from the microwave, respectively. By phase-locking the two frequency components with a microwave signal, the coherence of the dual-frequency light source can be further improved and the detection range can be much extended. In this paper, velocity resolutions of the DF-LDV with different amounts of speckle noise and at different detection ranges are experimentally measured and analyzed. Compared with the conventional single-frequency LDV (SF-LDV), the velocity resolution of the DF-LDV is improved by 8×103 times from 2.5 m/s to 0.31 mm/s for a target with a longitudinal velocity vz = 4 cm/s, a transverse velocity vt = 5 m/s, and at a detection range of 108 m.

© 2012 OSA

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(030.6140) Coherence and statistical optics : Speckle
(140.5960) Lasers and laser optics : Semiconductor lasers
(170.3340) Medical optics and biotechnology : Laser Doppler velocimetry
(190.3100) Nonlinear optics : Instabilities and chaos

ToC Category:
Coherence and Statistical Optics

Original Manuscript: April 18, 2012
Revised Manuscript: July 11, 2012
Manuscript Accepted: August 13, 2012
Published: August 20, 2012

Chih-Hao Cheng, Chia-Wei Lee, Tzu-Wei Lin, and Fan-Yi Lin, "Dual-frequency laser Doppler velocimeter for speckle noise reduction and coherence enhancement," Opt. Express 20, 20255-20265 (2012)

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