AVERAGE SPREADING OF APERTURED LASER BEAMS WITH BEAM DISTORTIONS IN NON-KOLMOGOROV TURBULENCE

作者：Tao, R M; Si, L; Ma, Y X; Zhou, P^*; Liu, Z J

来源：Journal of Electromagnetic Waves and Applications, 2012, 26(8-9): 1237-1247.

DOI：10.1080/09205071.2012.710723

RMS beam width of an apertured laser beam with beam distortions in non-Kolmogorov turbulence is derived with the help of statistical optics methods and extended Huygens-Fresnel principle. Variations of the beam width of an apertured beam with amplitude modulations and phase fluctuations propagating in non-Kolmogorov turbulence are studied in detail. Numerical examples reveal that the beam width mainly depends on the phase fluctuations and the truncations as well as the exponent value, the inner- and outer-scale parameters of the non-Kolmogorov turbulence. It is shown that phase fluctuations can vary the spreading, weaken the optimum truncation effects, and suppress the dependence of spreading on the inner-and outer-scale parameters. It is interesting to find that the effects of the phase fluctuations are negligible as long as the phase fluctuations are controlled under a certain level, i.e., a > 0.03 for the situation considered in the paper. Thus, there exists a phase fluctuation tolerance, which is meaningful for practical applications.

• 出版日期2012
• 单位中国人民解放军国防科学技术大学