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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 18 — Jun. 20, 2009
  • pp: 3468–3474

Bragg cell laser intensity modulation: effect on laser Doppler velocimetry measurements

Alexander G. Mychkovsky, Natasha A. Chang, and Steven L. Ceccio  »View Author Affiliations

Applied Optics, Vol. 48, Issue 18, pp. 3468-3474 (2009)

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In most laser Doppler velocimetry (LDV) systems, the frequency of one of the two laser beams that intersect to create the probe volume is shifted with an acousto-optic element. It is shown here that Bragg shifting can impose a problematic fluctuation in intensity on the frequency-shifted beam, producing spurious velocity measurements. This fluctuation occurs at twice the Bragg cell frequency, and its relative amplitude to the time average intensity is a function of the ratio of the laser beam diameter to the Bragg cell acoustic wavelength. A physical model and a configuration procedure to minimize adverse effects of the intensity modulations are presented.

© 2009 Optical Society of America

OCIS Codes
(060.4080) Fiber optics and optical communications : Modulation
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(230.1040) Optical devices : Acousto-optical devices

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: April 28, 2009
Manuscript Accepted: May 27, 2009
Published: June 12, 2009

Alexander G. Mychkovsky, Natasha A. Chang, and Steven L. Ceccio, "Bragg cell laser intensity modulation: effect on laser Doppler velocimetry measurements," Appl. Opt. 48, 3468-3474 (2009)

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