Multiple filaments generation of ultrafast laser pulse by a periodic gas lattice

Yajun Guo; Jianji Wang; Xiaowei Song; Jingquan Lin

doi:10.1117/12.2605123

9 September 2021 Multiple filaments generation of ultrafast laser pulse by a periodic gas lattice

Yajun Guo, Jianji Wang, Xiaowei Song, Jingquan Lin

Proceedings Volume 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021); 119090H (2021) https://doi.org/10.1117/12.2605123
Event: Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 2021, Chengdu, China

Abstract

Multiple filaments generation and manipulation are crucial to numerous applications. The refractive index of medium has essentially influenced nonlinear effects in the ultrafast optical process of femtosecond laser filamentation, which is an effective method to tailor and manipulate filamentation. We have proposed a new method that using a periodic gas lattice as transmission medium to generate multiple filaments of femtosecond laser pulse. The periodic gas lattice is consisted of air waveguides, which has the special refractive index change distribution with alternating positive and negative. Our results show that the properties of multi-filament can be well controlled by changing the parameters of the gas lattice. A multi-filament array is formed by the gas lattice along the beam propagation direction, which are systemically investigated with different parameters of lattice at filamentation stages. The underlying physical mechanism of the multi-filament array formation is discussed, which has been demonstrated that the effects of extra focusing and discrete diffraction introduced by the gas lattice medium to promote a new competition and balance in the nonlinear filamentation process. The findings in this work provide a new way for many potential and promising applications that based on the controlled and optimized the femtosecond laser multi-filament array.

Citation Download Citation

Yajun Guo, Jianji Wang, Xiaowei Song, and Jingquan Lin "Multiple filaments generation of ultrafast laser pulse by a periodic gas lattice", Proc. SPIE 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 119090H (9 September 2021); https://doi.org/10.1117/12.2605123

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KEYWORDS

Refractive index

Femtosecond phenomena

Modulation

Diffraction

Ultrafast lasers

Waveguides

3D modeling

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