Two-laser differential absorption for wide molecular bands

Richard W. Fox; Y. Rudich; Ranajit K. Talukdar; A. R. Ravishankara; Leo W. Hollberg

doi:10.1117/12.256131

31 October 1996 Two-laser differential absorption for wide molecular bands

Richard W. Fox, Y. Rudich, Ranajit K. Talukdar, A. R. Ravishankara, Leo W. Hollberg

Proceedings Volume 2830, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research II; (1996) https://doi.org/10.1117/12.256131
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

To measure trace concentrations of the atmospheric radical NO₃ we are investigating the use of two amplitude stabilized diode lasers, one tunes to the center of the absorption profile, and the second tuned to a wavelength outside the absorption. This approach is taken because the absorption feature is much broader than the visible diode laser's tuning range and removing the sample concentration from the beam path to measure the baseline is difficult. This paper describes the preliminary system design, interferences expected from water, and electronics design.

Citation Download Citation

Richard W. Fox, Y. Rudich, Ranajit K. Talukdar, A. R. Ravishankara, and Leo W. Hollberg "Two-laser differential absorption for wide molecular bands", Proc. SPIE 2830, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research II, (31 October 1996); https://doi.org/10.1117/12.256131

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