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Proceedings Paper

Laser-induced atmospheric transmission windows in the infrared
Author(s): Sergey V. Ivanov; O. G. Buzykin; Dmitry A. Rusyanov
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Paper Abstract

The reduction of strong interfering absorption of atmospheric water vapor and carbon dioxide in infrared and microwave regions is important in various applications. We present an accurate theoretical model and simulation results for nonequilibrium infrared high-resolution absorption spectra of the atmospheric air aiming to study its laser bleaching. Line- by-line spectra are computed using: HITRAN database, modern continuum absorption models, season-latitude atmospheric data. Time-dependent populations of vibrational levels are simulated using kinetic equations accounting for state-by-state processes of vibrational relaxation and laser pumping. The calculations are performed for different altitudes in the atmosphere for selected pumping frequencies of CO- and HBr- lasers. The effects of vibrational and vibration-rotational population inversion in CO2 and H2O molecules are studied numerically. In particular, marked inversion of CO2 vibrational levels has been found to occur at moderate pumping intensities resulting in negative absorption in 8 - 12-micrometer transmission window. The complex altitude behavior of absorption coefficient in 10.6 micrometer P(20) CO2 line is discussed. The possibility of formation of spectral microwindows with negative absorption in 6.27 micrometer H2O band is demonstrated. The first results regarding water vapor continuum absorption control by IR lasers are presented.

Paper Details

Date Published: 5 February 1999
PDF: 7 pages
Proc. SPIE 3732, ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, (5 February 1999); doi: 10.1117/12.340006
Show Author Affiliations
Sergey V. Ivanov, Scientific Research Ctr. for Technological Lasers (Russia)
O. G. Buzykin, Central Aerohydrodynamics Institute (Russia)
Dmitry A. Rusyanov, Central Aerohydrodynamics Institute (Russia)

Published in SPIE Proceedings Vol. 3732:
ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine
Andrey Yuri Chikishev; Victor N. Zadkov; Alexei M. Zheltikov, Editor(s)

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