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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 25, Iss. 7 — Jul. 1, 2008
  • pp: 1166–1177

Sub-Doppler dispersion and noise-immune cavity-enhanced optical heterodyne molecular spectroscopy revised

Ove Axner, Weiguang Ma, and Aleksandra Foltynowicz  »View Author Affiliations


JOSA B, Vol. 25, Issue 7, pp. 1166-1177 (2008)
http://dx.doi.org/10.1364/JOSAB.25.001166


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Abstract

An expression for the peak-to-peak sub-Doppler optical phase shift of two counterpropagating modes of light, to which the noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) dispersion signal is proportional, valid for arbitrary degree of saturation, is derived. For low degrees of saturation it agrees with the expression for weakly saturating ( w s ) conditions, [ ( 1 + S ) 1 2 ( 1 + 2 S ) 1 2 ] α 0 2 , where S is the degree of saturation and α 0 is the unsaturated peak absorption. However, the new expression, which can be written as 0.45 S ( 1 + S ) 1 α 0 2 , does not predict a distinct maximum as the w s expression does; instead it predicts an optical phase shift that increases monotonically with S and levels off to 0.45 α 0 2 for large S. This alters the optimum conditions for the sub-Doppler NICE-OHMS technique and improves its shot-noise-limited detectability. The new expression is based upon the same explicit assumptions as the w s expression but not the Kramers–Kronig relations, which are not valid for nonlinear responses, and is supported by experimental results up to S = 100 . The new expression is expected to be valid for all techniques measuring sub-Doppler dispersion signals.

© 2008 Optical Society of America

OCIS Codes
(020.3690) Atomic and molecular physics : Line shapes and shifts
(140.3510) Lasers and laser optics : Lasers, fiber
(260.2030) Physical optics : Dispersion
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6380) Spectroscopy : Spectroscopy, modulation
(300.6460) Spectroscopy : Spectroscopy, saturation

ToC Category:
Spectroscopy

History
Original Manuscript: March 13, 2008
Revised Manuscript: April 29, 2008
Manuscript Accepted: April 30, 2008
Published: June 24, 2008

Citation
Ove Axner, Weiguang Ma, and Aleksandra Foltynowicz, "Sub-Doppler dispersion and noise-immune cavity-enhanced optical heterodyne molecular spectroscopy revised," J. Opt. Soc. Am. B 25, 1166-1177 (2008)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-25-7-1166


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References

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