TY CONF TI SIMULATION OF EVOLUTION OF THE EFFECTIVE RADIUS OF A HIGH-POWER ULTRASHORT LASER BEAM IN A TURBULENT MEDIUM KW laser radiation KW self-focusing KW self-channeling KW turbulence JO International Symposium Atmospheric and Ocean Optics. Atmospheric Physics AU Zemlyanov, A.A. AU Zemlyanova, O.D. PY 2026 PB V.E. Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences