High-Resolution Atmospheric Spectroscopy Using A Diode Laser Heterodyne Spectrometer

James M. Hoell, Jr.; Charles N. Harward; Wayne Lo

doi:10.1117/12.931905

28 July 1981 High-Resolution Atmospheric Spectroscopy Using A Diode Laser Heterodyne Spectrometer

James M. Hoell, Jr., Charles N. Harward, Wayne Lo

Proceedings Volume 0277, Atmospheric Transmission; (1981) https://doi.org/10.1117/12.931905
Event: 1981 Technical Symposium East, 1981, Washington, D.C., United States

Abstract

Atmospheric spectroscopy, employing the sun as a source, has been routinely used for a number of years as a means for identification and quantitative measurements of atmospheric species. Recent improvements in Pb-salt semiconductor laser technology when combined with infrared heterodyne technology provide the capability of obtaining solar spectra with sub-Doppler spectral resolution. In this paper we will discuss ultra-high resolution (0.007cm^-1) atmospheric solar absorption spectra that have been obtained from a Tunable Infrared Heterodyne Radiometer. The radiometer was developed for ground based observations in the 8 to 12 pm region and tunability is achieved through the use of Pb-salt semiconductor laser local oscillators (LO). Spectra have been obtained in a piece-wise fashion from 9.1 to 11.1 pm using laser emission modes that exhibit characteristics suita-ble for LO operation. Spectra showing absorption features of HNO₃, 0₃, CO₂, and H₂O will be presented along with comparisons of experimental and synthetic spectra calculated using a line-by-line atmospheric transmission model.

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James M. Hoell, Jr., Charles N. Harward, and Wayne Lo "High-Resolution Atmospheric Spectroscopy Using A Diode Laser Heterodyne Spectrometer", Proc. SPIE 0277, Atmospheric Transmission, (28 July 1981); https://doi.org/10.1117/12.931905

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KEYWORDS

Absorption

Atmospheric modeling

Heterodyning

Semiconductor lasers

Spectral resolution

Spectroscopy

Infrared radiation

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