Thermal Self-Action of Laser Beams and Filamentation of Pulses in Turbulent Atmosphere
Thermal Self-Action of Laser Beams and Filamentation of Pulses in Turbulent Atmosphere
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DOI：
10.1134/s1024856012030062
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发表时间：
2012-05-01
影响因子：
0.7
通讯作者：
Shlenov, S. A.
中科院分区：
文献类型：
--
作者：
Kandidov, V. P.;Shlenov, S. A.
对湍流大气中非平稳热自作用和高功率激光辐射丝状化下时空不稳定性发展的情景进行了比较分析。结果表明，在非平稳热自作用条件下，强度扰动和大气湍流的空间维度相似。光场的扰动是在成丝过程中形成的，其规模与湍流气氛中折射率的初始波动的大小无关。由此产生的光场不稳定性是由热自作用下热透镜上的辐射像差散焦和激光辐射丝状形成下等离子透镜上的辐射像差散焦决定的。
comparative analysis of scenarios for the development of spatiotemporal instability under nonstationary thermal self-action and filamentation of high-power laser radiation in turbulent atmosphere has been performed. It is shown that the spatial dimensions of intensity perturbations and atmospheric turbulence are similar under conditions of nonstationary thermal self-action. Perturbations of the light field are formed during filamentation at a scale independent of the size of the initiating fluctuations of the refractive index in turbulent atmosphere. The resulting instability of the light field is determined by aberration defocusing of radiation on thermal lenses under thermal self-action and on plasma lenses under laser radiation filamentation.