Abstract
Self-action of a femtosecond optical vortex in fused silica at a wavelength of 1900 nm is analyzed by means of numerical simulations. The formation of a multi-focus ring structure is demonstrated. We show that self-focusing in a ring of relatively large radius occurs without plasma generation. The frequency spectrum of the pulse is broadening mainly into the Stokes band.
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Shlenov, S.A., Vasilyev, E.V., Kandidov, V.P. (2019). Spatio-Temporal and Spectral Transformation of Femtosecond Pulsed Beams with Phase Dislocation Propagating Under Conditions of Self-action in Transparent Solid-State Dielectrics. In: Yamanouchi, K., Tunik, S., Makarov, V. (eds) Progress in Photon Science. Springer Series in Chemical Physics, vol 119. Springer, Cham. https://doi.org/10.1007/978-3-030-05974-3_3
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