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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 5, Iss. 6 — Jun. 1, 1988
  • pp: 1253–1256

Reduction of residual amplitude modulation in frequency-modulation spectroscopy by using harmonic frequency modulation

Edward A. Whittaker, Chi Man Shum, Haim Grebel, and Haim Lotem  »View Author Affiliations

JOSA B, Vol. 5, Issue 6, pp. 1253-1256 (1988)

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A new technique to improve the sensitivity of frequency-modulation laser absorption spectroscopy is reported. Theoretical analysis and experimental demonstration show that the application of two harmonically related, appropriately phase-shifted rf waves to the electro-optic modulator can reduce the residual amplitude-modulation background signal in the photodetector output current without reducing the absorption-induced signal. When the new method was used, the residual amplitude-modulation background was reduced by a factor of 4. Our results suggest that shot-noise-limited detection sensitivity may eventually be achieved without using dual-beam compensation or dc-biased modulators.

© 1988 Optical Society of America

Original Manuscript: November 12, 1987
Manuscript Accepted: February 23, 1988
Published: June 1, 1988

Edward A. Whittaker, Haim Grebel, Haim Lotem, and Chi Man Shum, "Reduction of residual amplitude modulation in frequency-modulation spectroscopy by using harmonic frequency modulation," J. Opt. Soc. Am. B 5, 1253-1256 (1988)

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