期刊
PHYSICS LETTERS A
卷 362, 期 5-6, 页码 505-510出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2006.11.025
关键词
self focusing; spatial solitons; cubic quintic nonlinearity; cosh-Gaussian laser beams; flat top solitons
In this Letter, we have investigated the propagation characteristics of a cosh-Gaussian laser beam both in Kerr and cubic quintic nonlinear media. An appropriate nonlinear Schrodinger equation has been solved numerically to reveal the beam dynamics. It is found that these beams are unstable and convert into sech/Gaussian type beam. In Kerr media, they undergo collapse above certain virtual threshold power. In defocussing quintic nonlinear media too, with low and moderate power these beams transform into sech/Gaussian beam. At high power they form flat top beam, where the length of the flat top and sharpness of flatness increase with the increase in power. At very large power the beam first splits into two and again coalesces and this phenomenon recurs. (c) 2006 Elsevier B.V. All rights reserved.
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