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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 32 — Nov. 10, 2007
  • pp: 7868–7871

Modulation-enhanced sensitivity of holographic interferometry

Steven M. Hughes and Dana Z. Anderson  »View Author Affiliations

Applied Optics, Vol. 46, Issue 32, pp. 7868-7871 (2007)

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A modulation–demodulation scheme substantially enhances diffusion-dominated–adaptive-interferometric sensitivity. The path length sensitivity is improved by converting a quadratic small-signal response, easily drowned in system noise, to a linear response by mixing with a strong phase modulation. This conversion also shifts low-frequency signals away from 1 / f noise. Experimental results show 180 fm / Hz displacement sensitivity for a 5   Hz signal with a few milliwatts of optical power, an improvement of 3 orders of magnitude over the unenhanced system.

© 2007 Optical Society of America

OCIS Codes
(060.5060) Fiber optics and optical communications : Phase modulation
(090.2880) Holography : Holographic interferometry
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(190.5330) Nonlinear optics : Photorefractive optics

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: July 24, 2007
Manuscript Accepted: September 6, 2007
Published: November 8, 2007

Steven M. Hughes and Dana Z. Anderson, "Modulation-enhanced sensitivity of holographic interferometry," Appl. Opt. 46, 7868-7871 (2007)

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