Filamentation of a focused Ti:Sapphire-laser pulse at two harmonics in air D. V. Apeximov, E. E. Bykova, Yu. <...> E. Geints, A. A. Zemlyanov, A. M. Kabanov, G. G. Matvienko, V. K. Oshlakov, A. V. Petrov Zuev Institute of Atmospheric Optics SB RAS 1 Academician Zuev sq., Tomsk, 634021, Russia E-mail: bee@iao.ru O. A. Bukin, A. A. Ilyin, 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 Far-Eastern National University 8 Sukhanov str., Vladivostok, 690950, Russia E-mail: golic_s@mail.ru The results of the experiments on dynamics of filamentation of high-power ultrashort Ti:Sapphire-laser pulses with the wavelengths of 800 and 400 nm during their sharp focusing in air are presented. <...> The laser pulse spectra during its filamentation are measured. <...> PACS: 42.65.Jx, 42.65.Re, 42.68.Mj Keywords: ultrashort laser radiation, filamentation, sharp focusing, plasma channel, Kerr effect, spectrum. <...>