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Atmospheric and Oceanic Optics

2015 year, number 12

The microstructure of multi-filamentation region of femtosecond laser radiation in solid dielectric

Yu.E. Geints1, S.S. Golik2, A.A. Zemlyanov1, A.M. Kabanov1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2Far Eastern Federal University, 8, Suhanova St., Vladivostok, 690950, Russia
Keywords: фемтосекундное лазерное излучение, множественная филаментация, лазерная плазма, femtosecond laser radiation, multiple filamentation, laser plasma


Peculiarities of multiple filamentation of femtosecond laser pulses with gigawatt-level power in optical glass are considered. We analyze experimentally and by numerical simulations the fine structure of the plasma region accompanying light filaments and being created upon photoionization of dielectric. For the first time, the dependence of the number, position, and length of the individual generations of plasma channels on the laser energy is investigated. The role of pulse refocusing events in the formation of plasma region is discussed.