Filamentation of non-Gaussian beams with different geometrical divergence along an atmospheric path
D.V. Apeksimov, Yu.E. Geints, A.A. Zemlyanov, A.M. Kabanov, G.G. Matvienko, A.N. Stepanov
Keywords: ультракороткое лазерное излучение, фокусировка, филаментация, ultrashort laser radiation, focused propagation, filamentation
Abstract
The results of atmospheric experiments on propagation of femtosecond IR-pulses with complex initial transverse profile of intensity under self-focusing and filamentation conditions are presented. The effect of initial geometric divergence of radiation on transverse structure of light energy of a beam at the end of the path is studied. Numerical simulation of the problem is carried out and parameters of the generated filaments and plasma channel are determined. It is shown that geometric focusing or defocusing of radiation allow the transfer of the nonlinear focus and filamentation region connected with it along the path in sufficiently wide range.
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