飞秒脉冲在熔融石英中非线性传播模式区分的数值模拟研究

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

作者信息

Liu Faqian, Xi Tingting, Zhang Lanzhi, Li Dongwei, Hao Zuoqiang

机构信息

Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Devices, School of Physics and Electronics, Shandong Normal University, Jinan, 250358, China.

School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 101407, China.

出版信息

Sci Rep. 2024 Mar 9;14(1):5824. doi: 10.1038/s41598-024-56460-0.

DOI:10.1038/s41598-024-56460-0

PMID:38461366

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10925035/

Abstract

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.

摘要

我们进行数值模拟，以研究飞秒高斯光束和涡旋光束在熔融石英中的非线性传播动力学。通过分析光谱展宽的程度，我们能够区分线性、自聚焦和丝状化区域。此外，针对不同的入射激光能量，分析了涡旋光束横截面内的最大强度和通量分布。结果表明，光谱展宽与飞秒激光脉冲的峰值强度之间存在直接关联。因此，这为区分不同的传播区域以及确定飞秒高斯光束和结构化光束自聚焦和丝状化的临界功率提供了理论基础。