The effect of the kinetics of the molecular absorption of radiation on the propagation of a pulse with a wavelength of 10.6 microns in the atmosphere
Abstract
The paper is concerned with the unsteady thermal self-defocusing of a collimated Gaussian beam with a wavelength of 10.6 microns propagating in a standard atmosphere containing no dust or aerosol particles along a vertical path up to a height of 20 km above the sea level under conditions of the resonance absorption of radiation by atmospheric carbon dioxide. The length of the rectangular pulse is determined by the onset of beam defocusing in the exist cross section and varies in the range 0.1-2 ms for the range of beam parameters investigated. The effect of kinetic cooling and optical brightening on changes in the beam shape is analyzed numerically for different radiation intensities and humidity levels.
- Publication:
-
PMTF Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki
- Pub Date:
- August 1986
- Bibcode:
- 1986PMTF.........3N
- Keywords:
-
- Atmospheric Optics;
- Electromagnetic Wave Transmission;
- Infrared Lasers;
- Molecular Absorption;
- Pulsed Lasers;
- Carbon Dioxide;
- Collimation;
- Parabolic Differential Equations;
- Thermal Blooming;
- Time Response;
- Lasers and Masers