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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 31, Iss. 18 — Jun. 20, 1992
  • pp: 3409–3415

Measurement of molecular concentrations and line parameters using line-locked second harmonic spectroscopy with an AlGaAs diode laser

Neil Goldstein, Steven Adler-Golden, Jamine Lee, and Fritz Bien  »View Author Affiliations


Applied Optics, Vol. 31, Issue 18, pp. 3409-3415 (1992)
http://dx.doi.org/10.1364/AO.31.003409


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Abstract

The technique of line-locked wavelength modulation with 2f detection is applied to the measurement of water vapor concentration and absorption line parameters by using an 820-nm AlGaAs communications diode laser. Measurements of the 2f signal as a function of the modulation amplitude yield accurate concentrations and line parameters over a pressure range of an order of magnitude and half-widths from 0.02 to 0.15 cm−1. Using two different spectral lines, we determined concentrations and line parameters with 1% precision, and the absolute accuracy of the line parameters is 3% or better. The results have been used to calculate calibration curves for a diode laser humidity monitor.

© 1992 Optical Society of America

History
Original Manuscript: May 31, 1991
Published: June 20, 1992

Citation
Neil Goldstein, Steven Adler-Golden, Jamine Lee, and Fritz Bien, "Measurement of molecular concentrations and line parameters using line-locked second harmonic spectroscopy with an AlGaAs diode laser," Appl. Opt. 31, 3409-3415 (1992)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-31-18-3409


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