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Wang LG, Riris H, Carlisle CB, et al. Comparison of approaches to modulation spectroscopy with GaAIAs semiconductor lasers: application to water vapor. Appl Opt. 1988;27(10):2071-7doi: 10.1364/AO.27.002071.
Wang, L. G., Riris, H., Carlisle, C. B., & Gallagher, T. F. (1988). Comparison of approaches to modulation spectroscopy with GaAIAs semiconductor lasers: application to water vapor. Applied optics, 27(10), 2071-7. https://doi.org/10.1364/AO.27.002071
Wang, L G, et al. "Comparison of approaches to modulation spectroscopy with GaAIAs semiconductor lasers: application to water vapor." Applied optics vol. 27,10 (1988): 2071-7. doi: https://doi.org/10.1364/AO.27.002071
Wang LG, Riris H, Carlisle CB, Gallagher TF. Comparison of approaches to modulation spectroscopy with GaAIAs semiconductor lasers: application to water vapor. Appl Opt. 1988 May 15;27(10):2071-7. doi: 10.1364/AO.27.002071. PMID: 20531708.
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Appl Opt. 1988 May 15;27(10):2071-7. doi: 10.1364/AO.27.002071.

Comparison of approaches to modulation spectroscopy with GaAIAs semiconductor lasers: application to water vapor.

Applied optics

L G Wang, H Riris, C B Carlisle, T F Gallagher

PMID: 20531708 DOI: 10.1364/AO.27.002071

Abstract

Four different forms of modulation spectroscopy were used to study water vapor absorption around 816 nm using GaAIAs semiconductor lasers. They are wavelength modulation at 1 kHz and 100 MHz, single-tone frequency modulation (FM) at 1 GHz, and two-tone FM at I GHz +/- 10 MHz. Extrapolating from measurements on a 1.4% absorption we find that two-tone frequency modulation is sensitive to an absorption of 2.4 x 10(-6). This is at least an order of magnitude more sensitive than single-tone FM and wavelength modulation.

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