Multiple filamentation of collimated laser radiation in water and glass
D.V. Apeksimov1, S.S. Golik2,3, A.A. Zemlyanov1, A.N. Iglakova1, A.M. Kabanov1, O.I. Kuchinskaya1,4, G.G. Matvienko1,4, V.K. Oshlakov1, A.V. Petrov1, E.B. Sokolova1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2Institute of Automation and Control Prosesses Far Easten Branch of the Russian Academy of Science, 5 Radio Street, Vladivostok, 690041
3Far Eastern Federal University, 8, Suhanova St., Vladivostok, 690950, Russia
4National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia
Keywords: лазерное излучение, фемтосекундный импульс, самофокусировка, множественная филаментация, стекло, вода, laser radiation, femtosecond pulse, self-focusing, multiple filamentation, glass, water
Abstract
Results of experimental investigation of spatial characteristics of the region of multiple filamentstion of giga- and terawatt pulses of Ti:Sapphire laser in the glass and water are presented. The pulse power dependences of the coordinates of the filamentation region, the number of filaments, their distribution along the axis of the laser beam, and the mean length of the filaments on the impulse power are presented. It is shown that the spatial characteristics of filamentation region are qualitatively similar for water and glass. It is found that the number of filaments along the region of multiple filamentation has a unimodal distribution. When increasing the radiation power, the length of individual filaments in the field of multiple filamentation is reduced, and the diameter has a quasi-constant value at all values of power, implemented in the experiments. The filamentation region, when reaching a certain power laser pulses with a Gaussian distribution of energy density, takes the form of a hollow cone with the apex directed to the source of radiation.
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