The third harmonic (TH) vortex generated by the filamentation of femtosecond vortex beam in air is simulated. The influences of perturbation distribution and peak power of the initial fundamental wave (FW) on the evolution of the two-color vortex are investigated. For the initial FW with symmetrical perturbation, the intensity annulus of the two-color vortex is not influenced by the initial peak power and can be kept in the filamentation regime. But the spiral phase distribution is influenced by multiple filamentation under the high peak power condition. In this case, the spiral phase distribution of the two-color vortex is destroyed due to the phase accumulation of the multiple filaments. For the initial FW with asymmetrical perturbation, both the spatial annulus and the spiral phase distribution of the two-color vortex are destroyed when multiple filaments are formed.
ZHAN Lindi
,
ZHONG Zhiping
,
XU Litong
,
XI Tingting
,
HAO Zuoqiang
. Co-propagation of femtosecond vortex beam and the generated third harmonic in air[J]. Journal of University of Chinese Academy of Sciences, 2021
, 38(4)
: 450
-458
.
DOI: 10.7523/j.issn.2095-6134.2021.04.003
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