title: Optimization of multiple filamentation of femtosecond laser pulses in air using a pinhole.
abstract: 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.
authors: Zuo-Qiang
authors: ZQ
authors: Hao
authors: Jie
authors: J
authors: Zhang
authors: Ting-Ting
authors: TT
authors: Xi
authors: Xiao-Hui
authors: XH
authors: Yuan
authors: Zhi-Yuan
authors: ZY
authors: Zheng
authors: Xin
authors: X
authors: Lu
authors: Ming-Young
authors: MY
authors: Yu
authors: Yu-Tong
authors: YT
authors: Li
authors: Zhao-Hua
authors: ZH
authors: Wang
authors: Wei
authors: W
authors: Zhao
authors: Zhi-Yi
authors: ZY
authors: Wei