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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Effect of power losses on self-focusing of high-intensity laser beam in gases
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Effect of power losses on self-focusing of high-intensity laser beam in gases

机译：功率损耗对气体中高强度激光束自聚焦的影响

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摘要

A theoretical study of power loss from periphery of an ultrashort pulse laser beam and temporally resolved defocusing produced by laser-induced plasma are performed using paraxial approximation. Our analysis incorporates consideration of spatial distribution of the laser beam irradiance and the results show that substantial power losses (10-80%) occur from the beam periphery limiting the length of a filament. It was also shown that the generally accepted concept of self-focusing critical power is inconsistent with consideration of self-induced refraction of spatially distributed laser beam. A new criterion for self-focusing and hypothesis for multiple filamentation are proposed.
机译：使用近轴近似对超短脉冲激光束的功率损耗和激光诱导的等离子体产生的时间分辨散焦进行了理论研究。我们的分析综合考虑了激光束辐照度的空间分布，结果表明，光束周长限制了灯丝的长度，造成了相当大的功率损耗（10-80％）。还表明，自聚焦临界功率的普遍接受的概念与考虑空间分布激光束的自感应折射是不一致的。提出了一种新的自聚焦准则和多重丝状化的假设。

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