Wave structure function and long-exposure MTF for laser beam propagation through non-Kolmogorov turbulence

被引：12

作者：

Kotiang, Stephen ^{[1
]}

Choi, Jaeho ^{[1
]}

机构：

[1] Chonbuk Natl Univ, CAIIT, Dept Elect Engn, Chonju 561756, Chonbuk, South Korea

来源：

OPTICS AND LASER TECHNOLOGY | 2015年 / 74卷

关键词：

Atmospheric turbulence; Non-Kolmogorov turbulence; Modulation transfer function; MODULATION TRANSFER-FUNCTION; ATMOSPHERIC-TURBULENCE; OPTICAL COMMUNICATION; TROPOSPHERE; AEROSOL; POWER;

D O I：

10.1016/j.optlastec.2015.05.011

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The degrading effects of atmospheric turbulence on an imaging system can be characterized by the atmospheric modulation transfer function (MTF). In this paper, we derived analytically a new expression for the wave structure function (WSF) of a Gaussian-beam based on the weak fluctuation theory. We assumed the beam-wave is propagating through a horizontal path experiencing isotropic and homogeneous non-Kolmogorov atmospheric turbulence where the power spectrum has a generalized spectral power-law exponent which varies between 3 and 4 instead of the fixed classical Kolmogorov power-law exponent of 11/3. Using the WSF, we derived mathematical expressions for the spatial coherence radius and the long-exposure turbulence MTF of the Gaussian-beam wave. These new expressions were used to analyze the influence of power-law variations and beam sizes on the WSF and quality of imaging systems. The simulation results show that different exponent values produce varying effects on both WSF and imaging systems. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：87 / 92

页数：6

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