Spatial evolution of multiple filaments in air induced by femtosecond laser pulses.
The spatial evolution of plasma filaments in air induced by femtosecond laser pulses is investigated experimentally. Several major filaments and small scaled additional filaments are detected in the plasma channel. The complicated interaction process of filaments as splitting, fusion and spreading is observed. The major filaments propagate stably, and the small scaled additional filaments can be attracted to the major filaments and merged with them. The major filaments are formed due to the perturbation of initial beam profile and the small scaled filaments are mainly caused by the transverse modulational instability.
Hao
Zuo-Qiang
ZQ
Zhang
Jie
J
Lu
Xin
X
Xi
Ting-Ting
TT
Li
Yu-Tong
YT
Yuan
Xiao-Hui
XH
Zheng
Zhi-Yuan
ZY
Wang
Zhao-Hua
ZH
Ling
Wei-Jun
WJ
Wei
Zhi-Yi
ZY