Self-modulation of Bessel-Gaussian wave beams in a medium with cubic nonlinearity |
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Authors: | B B Sevruk |
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Institution: | (1) B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 prosp. Nezavisimosti, Minsk, 220072, Belarus |
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Abstract: | A semi-discrete dynamic model has been developed for the formation of the spatial structure of wave fields in a medium with
cubic nonlinearity. The characteristic features of self-focusing and conical modulation of intense Bessel-Gaussian light beams
of different orders have been studied in different stages of their evolution during propagation. It has been shown that as
a result of nonlinear refraction, in the far zone wave structures are formed consisting of three spatially separated conical
beams. Increasing the cone angle of the wave vectors leads to a decrease in the effect of conical modulation of the radiation,
and improves the structural stability of the beam. The considered self-modulation effects can be used for passive limiting
of the laser radiation power.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 5, pp. 626–630, September–October, 2006. |
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Keywords: | numerical modeling self-focusing of radiation medium with cubic nonlinearity formation of wave beams and diffraction Bessel-Gaussian light beams spatial soliton |
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