Pulse repetition rate effect on the plasma inside femtosecond laser filament in air  

作　　者：尹富康 王铁军 刘尧香 龙娟 魏迎霞 朱斌 周凯南 冷雨欣 Fukang Yin;Tie-Jun Wang;Yaoxiang Liu;Juan Long;Yingxia Wei;Bin Zhu;Kainan Zhou;Yuxin Leng(State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser Science,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Laser Fusion Research Center and Science&Technology on Plasma Physics Laboratory,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser Science,Chinese Academy of Sciences,Shanghai 201800,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]Laser Fusion Research Center and Science&Technology on Plasma Physics Laboratory,China Academy of Engineering Physics,Mianyang 621999,China

出　　处：《Chinese Optics Letters》2024年第1期135-140,共6页中国光学快报（英文版）

基　　金：in part supported by the NSAF(No.U2130123);the International Partnership Program of Chinese Academy of Sciences(Nos.181231KYSB20200033 and 181231KYSB20200040);the Shanghai Science and Technology Program(No.21511105000)。

摘　　要：The characteristics of plasmas play an important role in femtosecond laser filament-based applications.Spectroscopic analysis is used to experimentally investigate the plasma density and its temperature of the air filament under different pulse repetition rates.In our experiments,the measured average plasma density of the filament is 1.54×10^(17)cm^(-3)and the temperature of the plasma is about 5100 K under 100 Hz pulse repetition rate.The plasma density decreases to1.43×10^(17)cm^(-3)and the temperature increases to 6230 K as the pulse repetition rate increases to 1000 Hz.The experimental observation agrees with the numerical simulation by solving the nonlinear Schr?dinger equations with repetition rate related“low density hole”correction.

关 键 词：femtosecond laser filamentation cumulative effects electron density 

分 类 号：TN24[电子电信—物理电子学] O53[理学—等离子体物理]