Characteristics of multiple filaments generated by femtosecond laser pulses in air: Prefocused versus free propagation

被引：30
作者：
Hao, Zuoqiang
Zhang, Jie
Zhang, Zhe
Yuan, Xiaohui
Zheng, Zhiyuan
Lu, Xin
Jin, Zhan
Wang, Zhaohua
Zhong, Jiayong
Liu, Yunquan
机构：
[1] Chinese Acad Sci, Inst Phys, Lab Opt Phys, Beijing 100080, Peoples R China
[2] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710068, Peoples R China
[3] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
来源：
PHYSICAL REVIEW E | 2006年 / 74卷 / 06期
关键词：
D O I：
10.1103/PhysRevE.74.066402
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The characteristics of the multiple filaments formed by prefocused and freely propagating femtosecond laser pulses are investigated and compared. It is shown in our experiments that the diameter, length, stability, and interaction for the two cases can be quite different. The filaments formed by prefocused beam indicate dynamic spatial evolution with higher laser intensity and electron density. They have a typical diameter of 100 mu m are of shorter length. In the free propagation case, the filaments exhibit interesting properties such as hundred-meter propagation distance and mm-size diameter. Moreover, only the interaction of the filaments with the energy background affects the evolution of the filaments. Filament-filament interactions such as the filament splitting and merging were not observed in this case.
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页数：5
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