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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 7 — Jul. 1, 2014
  • pp: 1499–1507

Doppler broadened NICE-OHMS beyond the triplet formalism: assessment of optimum modulation index

Patrick Ehlers, Junyang Wang, Isak Silander, and Ove Axner  »View Author Affiliations


JOSA B, Vol. 31, Issue 7, pp. 1499-1507 (2014)
http://dx.doi.org/10.1364/JOSAB.31.001499


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Abstract

The dependence of Doppler broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) on the modulation index, β, has been investigated experimentally on C2H2 and CO2, both in the absence and the presence of optical saturation. It is shown that the maximum signals are obtained for β that produce more than one pair of sidebands: in the Doppler limit and for the prevailing conditions (unsaturated transition and the pertinent modulation frequency and Doppler widths) around 1 and 1.4 for the dispersion and absorption detection phases, respectively. The results verify predictions given in an accompanying work. It is also shown that there is no substantial broadening of the NICE-OHMS signal for β<1. The use of β of unity has yielded a Db-NICE-OHMS detection sensitivity of 4.9×1012cm1Hz1/2, which is the lowest (best) value so far achieved for NICE-OHMS based on a tunable laser. The number of sidebands that needs to be included in fits of the line-shape function to obtain good accuracy has been assessed. It is concluded that it is enough to consider three pairs of sidebands whenever the systematic errors in a concentration assessment should be below 1% when β<2 are used and <1 for β<1.5.

© 2014 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(140.4780) Lasers and laser optics : Optical resonators
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6380) Spectroscopy : Spectroscopy, modulation
(300.6390) Spectroscopy : Spectroscopy, molecular
(140.3518) Lasers and laser optics : Lasers, frequency modulated

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: January 29, 2014
Revised Manuscript: April 30, 2014
Manuscript Accepted: May 2, 2014
Published: June 11, 2014

Citation
Patrick Ehlers, Junyang Wang, Isak Silander, and Ove Axner, "Doppler broadened NICE-OHMS beyond the triplet formalism: assessment of optimum modulation index," J. Opt. Soc. Am. B 31, 1499-1507 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-7-1499

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