TY CONF TI Multifocal structure of high-power femtosecond laser radiation during filamentation in pressured gases KW femtosecond laser pulse KW nonlinear focus KW self-focusing KW laser filamentation KW pressured gas KW laser beam structure JO XVII International conference on pulsed lasers and laser applications – AMPL-2025 AU Geync, Y.E. AU Minina, O.V. PY 2025 PB V.E. Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences