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Allen MG, Carleton KL, Davis SJ, et al. Ultrasensitive dual-beam absorption and gain spectroscopy: applications for near-infrared and visible diode laser sensors. Appl Opt. 1995;34(18):3240-9doi: 10.1364/AO.34.003240.
Allen, M. G., Carleton, K. L., Davis, S. J., Kessler, W. J., Otis, C. E., Palombo, D. A., & Sonnenfroh, D. M. (1995). Ultrasensitive dual-beam absorption and gain spectroscopy: applications for near-infrared and visible diode laser sensors. Applied optics, 34(18), 3240-9. https://doi.org/10.1364/AO.34.003240
Allen, M G, et al. "Ultrasensitive dual-beam absorption and gain spectroscopy: applications for near-infrared and visible diode laser sensors." Applied optics vol. 34,18 (1995): 3240-9. doi: https://doi.org/10.1364/AO.34.003240
Allen MG, Carleton KL, Davis SJ, Kessler WJ, Otis CE, Palombo DA, Sonnenfroh DM. Ultrasensitive dual-beam absorption and gain spectroscopy: applications for near-infrared and visible diode laser sensors. Appl Opt. 1995 Jun 20;34(18):3240-9. doi: 10.1364/AO.34.003240. PMID: 21052129.
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Appl Opt. 1995 Jun 20;34(18):3240-9. doi: 10.1364/AO.34.003240.

Ultrasensitive dual-beam absorption and gain spectroscopy: applications for near-infrared and visible diode laser sensors.

Applied optics

M G Allen, K L Carleton, S J Davis, W J Kessler, C E Otis, D A Palombo, D M Sonnenfroh

PMID: 21052129 DOI: 10.1364/AO.34.003240

Abstract

A dual-beam detection strategy with automatic balancing is described for ultrasensitive spectroscopy. Absorbances of 2 × 10(-7) Hz(-½) in free-space configurations and 5 × 10(-6) Hz(-½) in fiber-coupled configurations are demonstrated. With the dual-beam technique, atmospherically broadened absorption transitions may be resolved with InGaAsP, AlGaAs, and AlGaInP single-longitudinal-mode diode lasers. Applications to trace measurements of NO(2), O(2), and H(2)O are described by the use of simple, inexpensive laser and detector systems. Small signal gain measurements on optically pumped I(2) with a sensitivity of 10(-5) are also reported.

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