Spatial characteristics of the filamentation region of gigawatt laser pulses at their various focusing along an atmospheric path
D. V. Apeksimov1, O. A. Bukin2, S. S. Golik3, A. A. Zemlyanov1, A. N. Iglakova1, A. M. Kabanov1, O. I. Kuchinskaya4, G. G. Matvienko1, V. K. Oshlakov1, A. V. Petrov1, E. B. Sokolova2, E. E. Khoroshaeva1
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: laser radiation, femtosecond pulse, self-focusing, filamentation, atmosphere, focusing, spectrum
Abstract
Results of experiments on controlling the position and length of the filamentation region of femtosecond laser pulses along an atmospheric path 30 m long using different initial spatial focusing are presented. A dependence of the filamentation region length on the values of numerical aperture of beam is derived. The obtained data on the filamentation region length and the amount of filaments are compared with the results of earlier experiments and data of other authors.
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