湍流大气中激光辐射的相位前沿畸变。

Phase-front distortion of laser radiation in a turbulent atmosphere.

作者信息

Born G K, Bogenberger R, Erben K D, Frank F, Mohr F, Sepp G

出版信息

Appl Opt. 1975 Dec 1;14(12):2857-63. doi: 10.1364/AO.14.002857.

DOI:10.1364/AO.14.002857

PMID:20155123

Abstract

The phase-front distortion of laser radiation propagating through the turbulent atmosphere has been measured simultaneously at several wavelengths in the visible using a long-range Mach-Zehnder interferometer with high spatial and temporal resolution (476 nm </= lambda </= 647 nm, 0.5 mm </= Deltar 60 mm Deltat = 0.5 msec, z </= 2 km, C(n) = 1.3 x 10(-7) M(-1/3)). Phase-structure function, transverse coherence length, and arrival-angle fluctuations are interpreted in terms of the meteorological quantities turbulence strength and turbulence structure and inner and outer scale. The investigation covers the strong turbulence regime (scintillation saturation regime) where wave coherence is essentially determined by phase effects. In this regime a breakup of the phase front is found to occur.

摘要

利用具有高空间和时间分辨率的远程马赫-曾德尔干涉仪，在可见光的几个波长下同时测量了激光辐射在湍流大气中传播时的相位前沿畸变（476纳米≤λ≤647纳米，0.5毫米≤Δr≤60毫米，Δt = 0.5毫秒，z≤2千米，C(n)=1.3×10⁻⁷米⁻¹/³）。根据气象量湍流强度、湍流结构以及内尺度和外尺度，对相位结构函数、横向相干长度和到达角起伏进行了解释。该研究涵盖了强湍流区域（闪烁饱和区域），在该区域中波的相干性主要由相位效应决定。在这个区域中发现相位前沿会发生破裂。