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

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作者：
Faqian Liu
Tingting Xi
Lanzhi Zhang
Dongwei Li
Zuoqiang Hao
机构：
[1] Shandong Normal University,Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Devices, School of Physics and Electronics
[2] University of Chinese Academy of Sciences,School of Physical Sciences
[3] Shandong Normal University,Collaborative Innovation Center of Light Manipulation and Applications
[4] China Normal University and Shandong Normal University,Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East
[5] East China Normal University,undefined
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Scientific Reports | / 14卷
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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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