Vol. 29, issue 01, article # 6

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.

Keywords:

laser radiation, femtosecond pulse, self-focusing, filamentation, atmosphere, focusing, defocusing, spectrum

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