不同能量背景的环形艾里飞秒激光光束大气成丝特性（英文）

发布时间：2018-01-05 16:04

本文关键词：不同能量背景的环形艾里飞秒激光光束大气成丝特性（英文）　出处：《红外与激光工程》2017年08期 　论文类型：期刊论文

【摘要】：自从第一次观察到飞秒激光大气成丝后,光丝备受科学家的关注。它的潜在应用价值主要包括电子加速、激光雷达远程遥感、太赫兹辐射和超短脉冲压缩。利用数值仿真的方法,通过改变艾里光束的衰减系数,研究了不同能量背景的环形艾里光束飞秒激光大气成丝特性,得到的光丝长度长于拥有相同峰值功率、弱能量背景高斯光束形成的光丝。通过分析飞秒激光光丝演化过程的时间和空间特性,发现了环形能量背景是环形艾里光束沿传播方向形成高能量密度光丝的前提条件。比较了环形艾里光束和高丝光束在成丝过程中的光谱展宽特性,发现不同衰减系数的环形艾里光束具有相似的光谱展宽特性,但要明显弱于高斯光束的光谱展宽。研究成果对与提升飞秒激光成丝效果具有参考意义。
[Abstract]:Since the first observation of femtosecond laser filaments in the atmosphere, optical filaments have attracted the attention of scientists. Their potential applications include electronic acceleration and remote sensing of lidar. Terahertz radiation and ultrashort pulse compression. By changing the attenuation coefficient of the Ellie beam, the filamentary characteristics of femtosecond laser with different energy backgrounds are studied by numerical simulation. The length of the obtained fiber is longer than that formed by Gao Si beam with the same peak power and weak energy background. The temporal and spatial characteristics of the evolution process of femtosecond laser fiber are analyzed. It is found that the annular energy background is the prerequisite for the formation of high energy density optical fiber along the propagation direction of annular Ai beam, and the spectral broadening characteristics of annular Ai beam and high filament beam in the process of filamination are compared. It is found that the annular Airius beams with different attenuation coefficients have similar spectral broadening characteristics, but they are obviously weaker than those of Gao Si beams. The research results have a reference significance for improving the filamentary effect of femtosecond laser.
【作者单位】：脉冲功率激光技术国家重点实验室;
【分类号】：TN24
【正文快照】： length of filaments can be apparently prolonged0 Introductionthrough the modulation of the confinement parameterof Airy beam.Filamentation induced by femtosecond laserpulses in gases has recently attracted considerable1 Numerical simulation modelinterest

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