Numerical simulation study on distinguishing nonlinear propagation regimes of femtosecond pulses in fused silica

被引：0
|
作者：
Liu, Faqian [1 ,2 ]
Xi, Tingting [3 ]
Zhang, Lanzhi [1 ,2 ,4 ,5 ,6 ]
Li, Dongwei [1 ,2 ,4 ,5 ,6 ]
Hao, Zuoqiang [1 ,2 ,4 ,5 ,6 ]
机构：
[1] Shandong Normal Univ, Shandong Prov Engn & Tech Ctr Light Manipulat, Sch Phys & Elect, Jinan 250358, Peoples R China
[2] Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Key Lab Opt & Photon Devices, Jinan 250358, Peoples R China
[3] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 101407, Peoples R China
[4] Shandong Normal Univ, Collaborat Innovat Ctr Light Manipulat & Applicat, Jinan 250358, Peoples R China
[5] China Normal Univ, Joint Res Ctr Light Manipulat Sci & Photon Integra, Shanghai 200241, Peoples R China
[6] East China Normal Univ, Shandong Normal Univ, Shanghai 200241, Peoples R China
来源：
SCIENTIFIC REPORTS | 2024年 / 14卷 / 01期
基金：
中国国家自然科学基金;
关键词：
CRITICAL POWER; LASER-PULSE; LIGHT FILAMENTS; VORTEX BEAMS; INTENSITY; AIR;
D O I：
10.1038/s41598-024-56460-0
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
We perform numerical simulations to investigate the nonlinear propagation dynamics of femtosecond Gaussian and vortex beams in fused silica. By analyzing the extent of spectral broadening, we are able to distinguish between the linear, self-focusing, and filamentation regimes. Additionally, the maximum intensity and fluence distribution within the cross-section of the vortex beams are analyzed for different incident laser energies. The results demonstrate a direct correlation between the spectral broadening and the peak intensity of the femtosecond laser pulse. As a result, this provides a theoretical foundation for distinguishing different propagation regimes, and determining critical powers for self-focusing and filamentation of both femtosecond Gaussian and structured beams.
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页数：7
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