Influence of coma aberration on aperture averaged scintillations in oceanic turbulence

Influence of coma aberration on aperture averaged scintillations in oceanic turbulence
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彗形像差对海洋湍流中孔径平均闪烁的影响

DOI:
10.1016/j.optlastec.2017.07.019
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发表时间:
2018
影响因子:
5
通讯作者:
Yu Hong
Yu Hong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Luo Yujuan;Ji Xiaoling;Yu Hong

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采用数值模拟方法,详细研究了彗差对海洋湍流中孔径平均闪烁的影响。一般来说,在弱海洋湍流中,利用彗差可以有效地抑制孔径平均闪烁,且孔径平均闪烁随彗差系数的增大而减小。然而,在中强海洋湍流中,彗差对孔径平均闪烁的影响可以忽略不计。此外,以盐度湍流为主的孔径平均闪烁大于以温度湍流为主的孔径平均闪烁。特别是,对于彗差高斯光束,孔径平均闪烁指数的行为与点闪烁指数的行为有很大的不同,孔径平均闪烁指数更适合于实际中对闪烁的表征。
The influence of coma aberration on aperture averaged scintillations in oceanic turbulence is studied in detail by using the numerical simulation method. In general, in weak oceanic turbulence, the aperture averaged scintillation can be effectively suppressed by means of the coma aberration, and the aperture averaged scintillation decreases as the coma aberration coefficient increases. However, in moderate and strong oceanic turbulence the influence of coma aberration on aperture averaged scintillations can be ignored. In addition, the aperture averaged scintillation dominated by salinity-induced turbulence is larger than that dominated by temperature-induced turbulence. In particular, it is shown that for coma-aberrated Gaussian beams, the behavior of aperture averaged scintillation index is quite different from the behavior of point scintillation index, and the aperture averaged scintillation index is more suitable for characterizing scintillations in practice.
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