Laser-induced atmospheric transmission windows in the infrared

Sergey V. Ivanov; O. G. Buzykin; Dmitry A. Rusyanov

doi:10.1117/12.340006

5 February 1999 Laser-induced atmospheric transmission windows in the infrared

Sergey V. Ivanov, O. G. Buzykin, Dmitry A. Rusyanov

Proceedings Volume 3732, ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine; (1999) https://doi.org/10.1117/12.340006
Event: ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, 1998, Moscow, Russian Federation

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.

Citation Download Citation

Sergey V. Ivanov, O. G. Buzykin, and Dmitry A. Rusyanov "Laser-induced atmospheric transmission windows in the infrared", Proc. SPIE 3732, ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, (5 February 1999); https://doi.org/10.1117/12.340006

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