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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 4, Iss. 4 — Apr. 1, 1987
  • pp: 470–480

Two-tone optical heterodyne spectroscopy with diode lasers: theory of line shapes and experimental results

David E. Cooper and Russell E. Warren  »View Author Affiliations

JOSA B, Vol. 4, Issue 4, pp. 470-480 (1987)

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This paper presents a theoretical analysis of the line shapes and signal-to-noise ratios obtained in two-tone optical heterodyne spectroscopy with tunable lead-salt diode lasers. The theory is described in terms of the frequency-modulation (FM) index β, the amplitude-modulation (AM) index M, their relative phase shift ψ, and the ratio of modulation frequency to the absorption-line half-width ν ¯ m. Synthetic spectra are presented for both Gaussian and Lorentzian line shapes and show considerable structural variation with the theoretical parameters. Experimental two-tone optical heterodyne spectra were obtained by modulating a specially modified lead-salt diode laser in the radio-frequency region. The experimental spectra obtained from NH3 absorption lines confirm the theoretical results.

© 1987 Optical Society of America

Original Manuscript: September 12, 1986
Manuscript Accepted: December 18, 1986
Published: April 1, 1987

David E. Cooper and Russell E. Warren, "Two-tone optical heterodyne spectroscopy with diode lasers: theory of line shapes and experimental results," J. Opt. Soc. Am. B 4, 470-480 (1987)

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