Abstract
A steady-state analysis of Gaussian laser beam in a nonlinear medium has been presented. It is shown that an oscillatory self-guided beam (whose width is oscillating with the propagation distance) in a saturable nonlinear medium can be uptapered by material gain. Moreover, the present investigation suggests that under certain conditions it is possible to obtain a stationary self-guided beam (planar wavefront) in a nonabsorbing medium from an initially oscillatory (nonplanar wavefront) beam in a nonabsorbing medium by uptapering it in a gain medium.
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