Abstract
Controllable annular multiple filaments (MF) are obtained in fused silica by using two collinear interfered femtosecond vortex laser beams. Both the distribution and number of filaments which are generated from the petaloid interference pattern, can be well controlled with the topological charges of input beams. Moreinterestingly, we find that the MF pattern can be continuously rotated by changing the phase difference between the two interfered beams. This paper provides an effective way to generate annular MF with stable distribution, and a flexible method to control the rotating filamentation pattern through exteriorregulation.
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