Interaction of GW laser pulses with water droplets D. V. Apeximov, E. E. Bykova, Yu. <...> E. Geints, A. A. Zemlyanov, A. M. Kabanov, G. G. Matvienko, V. K. Oshlakov, R. R. Khabibullin Zuev Institute of Atmospheric Optics, SB RAS 1 Academician Zuev sq., Tomsk, 634021, Russia E-mail: kam@iao.ru O. A. Bukin, E. B. Sokolova Institute for Automation and Control Processes, FEB RAS 5 Radio str., Vladivostok, 690041, Russia E-mail: o_bukin@mail.ru S. S. Golik, A. A. Ilyin Far-Eastern National University 8 Sukhanov str,, Vladivostok, 690950, Russia E-mail: golic_s@mail.ru Al. <...> A. Zemlyanov Siberian Physical-Technical Institute at Tomsk State University 1 Novosobornaya sq., Tomsk, 634050, Russia E-mail: zeml16@mail.ru The results of the experiments on femtosecond GW laser pulse interaction with isolated millimeter-sized water droplets are presented. <...> Temporal and spatial dynamics of optical breakdown in a liquid particle volume is investigated. <...> The mechanical fragmentation of the droplet as a result of the evaporation and explosion of superheated areas is also discussed. <...> The spectral characteristics of water particle emission during its explosive boiling are investigated. <...> PACS: 42.65.Jx, 42.65.Re, 42.68.Mj Keywords: femtosecond laser radiation, water droplet, photoionization, optical breakdown, particle explosive fragmentation. <...>