Random wanderings of laser beams under the effect of a turbulent jet of an aero-engine

Vladmir S. Sirazetdinov; Dmitry I. Dmitriev; Inga V. Ivanova; David H. Titterton

doi:10.1117/12.458430

28 February 2002 Random wanderings of laser beams under the effect of a turbulent jet of an aero-engine

Vladmir S. Sirazetdinov, Dmitry I. Dmitriev, Inga V. Ivanova, David H. Titterton

Proceedings Volume 4678, Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; (2002) https://doi.org/10.1117/12.458430
Event: Eighth Joint International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 2001, Irkutsk, Russian Federation

Abstract

The results of experimental measurements of dispersion of a laser beam centroid's random wanderings for beams disturbed by a high-speed turbulent aero-engine jet stream are presented. The duration of light pulses radiated synchronously at wavelengths of (lambda) equals 1.06 and 0.53 microns did not exceed 50 ns, which made it possible to record instantaneous far-field distributions of radiation intensity. In each experimental cycle that differed from one another by geometry of experiment (beam diameter of 10 or 30 mm, different angles of beam-jet intersection) not less than 1500 frames were recorded in the computer. The range of measured values for dispersion of the laser beam wanderings depends on conditions of experiment and varies within 60 divided by 180 (mu) rad for (lambda) equals1.06 microns and within 110 divided by 300 (mu) rad for (lambda) equals0.53 microns. A certain difference in dispersion of beam wanderings in horizontal and in vertical (orthogonally to jet's axis) directions has been detected. The analytical model to calculate dispersion of laser beam's wanderings agreeable with experimental data is presented. The results of the experiment have allowed it to estimate the type of a high- frequency component of refraction index fluctuations spectrum in the jet, which supplements von Karman's spectrum for a turbulent medium.

Citation Download Citation

Vladmir S. Sirazetdinov, Dmitry I. Dmitriev, Inga V. Ivanova, and David H. Titterton "Random wanderings of laser beams under the effect of a turbulent jet of an aero-engine", Proc. SPIE 4678, Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, (28 February 2002); https://doi.org/10.1117/12.458430

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