Influence of Initial Amplitude Perturbations on Filament Length of Pre-focused Femtosecond Laser Pulses  

作　　者：马媛媛 鲁欣 奚婷婷 龚旗煌 张杰 

机构地区：[1]State Key Laboratory for Mesoscopic Physics,Department of Physics,Peking University [2]Laboratory of Optical Physics,Institute of Physics,Chinese Academy of Sciences [3]Department of Physics,Graduate University of Chinese Academy of Sciences [4]Department of Physics,Shanghai Jiao Tong University

出　　处：《Plasma Science and Technology》2009年第6期637-641,共5页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.60621063,10634020,10734130 and 10521002);the National Basic Research Program of China(973 Program)(Nos.2007CB815101,2006CB806007)

摘　　要：Influence of random initial amplitude perturbations on the lilamentation ot prefocused femtosecond laser pulses is numerically studied. Simulations are performed for the filamentation of laser pulses with different modulation degrees and initial geometric focusings. The transverse waist of the laser beam is 5 mm. The behavior of the filament is strongly affected by the initial non-uniformity of the laser pulse envelope for a short initial focal length （f = 1 m）. In this case, the filament and plasma channel can survive for a longer distance with a small initial amplitude perturbation. For a laser pulse focused by a lens with a long focal length （f = 4 m）, decrease in the initial perturbation does not contribute to the length of the filament and the plasma channel.Influence of random initial amplitude perturbations on the lilamentation ot prefocused femtosecond laser pulses is numerically studied. Simulations are performed for the filamentation of laser pulses with different modulation degrees and initial geometric focusings. The transverse waist of the laser beam is 5 mm. The behavior of the filament is strongly affected by the initial non-uniformity of the laser pulse envelope for a short initial focal length （f = 1 m）. In this case, the filament and plasma channel can survive for a longer distance with a small initial amplitude perturbation. For a laser pulse focused by a lens with a long focal length （f = 4 m）, decrease in the initial perturbation does not contribute to the length of the filament and the plasma channel.

关 键 词：FILAMENTATION SELF-FOCUSING PERTURBATION 

分 类 号：TN241[电子电信—物理电子学]