Open AccessInfluence of the external focusing and the pulse parameters on the propagation of femtosecond annular Gaussian filaments in air
Author(s) -
Zhifang Feng,
Wei Li,
Chengjun Yu,
Xun Liu,
Yuan Liu,
Jie Liu,
Libin Fu
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.006381
Subject(s) - optics , femtosecond , radius , protein filament , self focusing , focal length , beam (structure) , pulse (music) , rayleigh length , physics , gaussian beam , materials science , lens (geology) , plasma , laser , laser beams , computer security , quantum mechanics , detector , computer science , composite material
We numerically investigate the effects of the external focusing and the pulse parameters on the propagation of the ring Gaussian filaments in air. The simulation results indicate that the onset distance of filament, the length and uniformity of the plasma strings, and the energy deposition strongly depend on these optical parameters. The length of optical filament can be extended greatly by adjusting the lens parameters near the maximum energy deposition. In addition, we find that, under the same initial intensity, the length and uniformity of the plasma strings can be tuned by increasing the beam width better than increasing the beam radius.