Optimization of multiple filamentation of femtosecond laser pulses in air using a pinhole.
The robustness and prolongation of multiple filamentation (MF) for femtosecond laser propagation in air are investigated experimentally and numerically. It is shown that the number, pattern, propagation distance, and spatial stability of MF can be controlled by a variable-aperture on-axis pinhole. The random MF pattern can be optimized to a deterministic pattern. In our numerical simulations, we configured double filaments to principlly simulate the experimental MF interactions. It is experimentally and numerically demonstrated that the pinhole can reduce the modulational instability of MF and is favorable for a more stable MF evolution.
Hao
Zuo-Qiang
ZQ
Zhang
Jie
J
Xi
Ting-Ting
TT
Yuan
Xiao-Hui
XH
Zheng
Zhi-Yuan
ZY
Lu
Xin
X
Yu
Ming-Young
MY
Li
Yu-Tong
YT
Wang
Zhao-Hua
ZH
Zhao
Wei
W
Wei
Zhi-Yi
ZY