Filamentation extension of femtosecond vortex beams by air density holes

doi:10.7523/j.ucas.2023.024

Abstract

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

CLC Number:

O437.5

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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