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.
Highlights
The propagation of ultra-intense femtosecond laser pulses in air has been extensively investigated recently in view of many potential applications such as lightning control and remote sensing of the atmosphere [1,2,3,4,5,6,7,8,9,10]
It is shown that the number, pattern, propagation distance, and spatial stability of multiple filamentation (MF) can be controlled by a variable-aperture on-axis pinhole
The random MF pattern can be optimized to a deterministic pattern
Summary
The propagation of ultra-intense femtosecond (fs) laser pulses in air has been extensively investigated recently in view of many potential applications such as lightning control and remote sensing of the atmosphere [1,2,3,4,5,6,7,8,9,10]. Mlejnek et al proposed a model of optical turbulent light guiding to explain the breakup and fusion of filaments [14]. This was confirmed experimentally by Bergé et al [15]. Our simulations retrieve the phenomenon that the filaments can be prolonged and stabilized, which is in good agreement with experimental results
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