Multiple filamentation of laser beams with different diameters in the air at a 100-meter path
D.V. Apeksimov1, A.A. Zemlyanov1, A.N. Iglakova1, A.M. Kabanov1, O.I. Kuchinskaya1,2, G.G. Matvienko1,2, V.K. Oshlakov1, A.V. Petrov1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia
Keywords: лазерное излучение, фемтосекундный импульс, самофокусировка, филаментация, атмосфера, фокусировка, дефокусировка, спектр, laser radiation, femtosecond pulse, self-focusing, filamentation, atmosphere, focusing, defocusing, spectrum
Abstract
Results of experiments on controlling the position and length of the filamentation zone of femtosecond laser pulses at atmospheric paths 150 m long using different initial spatial focusing and defocusing are presented. The distribution of filaments along the filamentation zone is found, the dependences of the length of the filamentation zone on the numerical aperture of the beam, its initial radius, and pulse power are measured. Emission spectra of the illumination of targets of various materials, placed in the region of the filament far from the radiation source, are recorded.
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