Femtosecond filamentation of optical vortex in a medium with anomalous group velocity dispersion
Lomonosov Moscow State University, Faculty of Physics and International Laser Center, 119991, Moscow, Russia
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Published online: 31 October 2017
Within the framework of the slowly varying wave approximation method, the pictures of spatio-temporal dynamics of femtosecond pulse in a ring beam with phase singularity were obtained during propagation in CaF2 crystal with anomalous group velocity dispersion. We show formation of tubular structure of the beam and explain reasons of its appearance. Fluence and linear plasma concentration dependencies on propagation distance are analyzed.
© The Authors, published by EDP Sciences, 2017
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