飞秒涡旋激光在空气密度孔中成丝延长的理论研究

doi:10.7523/j.ucas.2023.024

摘要/Abstract

摘要： 数值模拟空气密度孔对飞秒涡旋激光在空气中成丝的影响。研究结果表明，对于不同初始能量的飞秒涡旋激光，通过在涡旋光成丝起点附近引入适当长度的空气密度孔，其成丝长度都可以得到极大的延长，最大可延长为无密度孔情况的4倍多。进一步研究揭示其物理机制，空气密度孔的引入导致脉冲中心涡旋环的散焦，改变了原有的电子密度及其分布，削弱了对后沿脉冲的散焦，使得飞秒涡旋脉冲后沿能够再聚焦，进而延长了成丝过程。

关键词: 涡旋光, 飞秒脉冲, 空气密度孔, 成丝

Abstract: We study the influence of air density holes on the filamentation of femtosecond vortex laser beams. The result shows that for the femtosecond vortex laser beams of different initial energies, the filamentation can be greatly elongated by introducing an air density hole which is located near the filamentation onset position. The maximal filamentation length is four times more than that without density hole. The mechanism is that the defocus of the most intense vortex ring induced by air density hole changes the density and distribution of the electrons. As a result, the defocus of trailing pulse edge is weakened, and the trailing edge of femtosecond vortex pulse can refocus, leading to the extension of the filamentation.

Key words: vortex beam, femtosecond laser pulse, air density hole, filamentation

中图分类号:

O437.5

杨炼彬, 徐立桐, 奚婷婷. 飞秒涡旋激光在空气密度孔中成丝延长的理论研究[J]. 中国科学院大学学报, 2023, 40(4): 433-440.

YANG Lianbin, XU Litong, XI Tingting. Filamentation extension of femtosecond vortex beams by air density holes[J]. Journal of University of Chinese Academy of Sciences, 2023, 40(4): 433-440.

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