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Proceedings Paper

Angular divergence of laser beams disturbed by an aero-engine exhaust jet
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Paper Abstract

The results of experimental studies of angular divergence for laser beams intersecting an aero-engine jet at different angles to its axis - 90 degree(s), 45 degree(s) and 10 degree(s), are presented. The experiments were carried out on the ground with radiation wavelengths of 1.06 and 0.53 microns. Depending on conditions of the experiment, the angular divergence of radiation impacted by the jet increased 6-35 times as compared to the initial values for undisturbed beams. It has been found that the angular width of the half- micron beam is significantly (two or three times) higher than that of the one-micron beam, which does not fit in with the model of radiation scattered by typical a turbulent medium. Besides, radiation intensity angular distribution demonstrated azimuthal asymmetry correlating with physically selected spatial directions - along and across the jet stream. Based on relevant selection of spectral density for refractive index fluctuations (composition of a turbulent spectrum and additional high frequency spectral components, anisotropy in the outer scales of turbulence) analytical relationships for evaluation of the angular divergence of disturbed beams matching experimental data have been obtained.

Paper Details

Date Published: 28 February 2002
PDF: 9 pages
Proc. SPIE 4678, Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, (28 February 2002); doi: 10.1117/12.458429
Show Author Affiliations
Vladmir S. Sirazetdinov, Research Institute for Complex Testing of Optoelectronic Devices (Russia)
Dmitry I. Dmitriev, Research Institute for Complex Testing of Optoelectronic Devices (Russia)
Inga V. Ivanova, Research Institute for Complex Testing of Optoelectronic Devices (Russia)
David H. Titterton, Defence Evaluation and Research Agency Farnborough (United Kingdom)


Published in SPIE Proceedings Vol. 4678:
Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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