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Pulse repetition-rate effect on the intensity inside a femtosecond laser filament in air

查看全文 作　　者：Fukang [1,2]Yin;Juan [1,2]Long;Yaoxiang [1]Liu;Yingxia [1]Wei;Bin [3]Zhu;Kainan [3]Zhou;Tie-Jun [1,2]Wang;Yuxin [1,2]Leng;Ruxin [1,2]Li 高影响力作者 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,China;[2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,China;[3]Laser Fusion Research Center and Science&Technology on Plasma Physics Laboratory,China Academy of Engineering Physics,Mianyang,China高影响力机构 出　　处：《High Power Laser Science and Engineering》索引2023年第11卷第4期,共8页高影响力期刊 基　　金：the NSAF(No.U2130123);the International Partnership Program of the Chinese Academy of Sciences(Nos.181231KYSB20200033 and 181231KYSB20200040);the Shanghai Science and Technology Program(No.21511105000). 摘　　要：As intense,ultrashort,kHz-repetition-rate laser systems become commercially available,pulse cumulative effects are critical for laser filament-based applications.In this work,the pulse repetition-rate effect on femtosecond laser filamentation in air was investigated both numerically and experimentally.The pulse repetition-rate effect has negligible influence at the leading edge of the filament.Clear intensity enhancement from a high-repetition pulse is observed at the peak and tailing edge of the laser filament.As the repetition rate of the laser pulses increases from 100 to 1000 Hz,the length of the filament extends and the intensity inside the filament increases.A physical picture based on the pulse repetition-rate dependent‘low-density hole’effect on filamentation is proposed to explain the obtained results well. 关 键 词：clamping intensity cumulative effects femtosecond laser filamentation
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