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20 March 2000 Astigmatic twisted beams: reducing the peak intensity in high-power waveguides
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We show that under the condition of local field limitation the total power transported through a waveguide can be substantially increased using twisted astigmatic generalized Gaussian beams. Numerical modeling of such beams in a parabolic waveguide with Kerr nonlinearity is carried out basing on the modified generalized moments method. The conditions are found that provide the optimal propagation regime in which the fixed-size beam spot rotates uniformly around the beam axis. It is shown that in this regime the peak intensity of the beam may be sufficiently lower than in stable axially-symmetric beams of the same total power.
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Vladimir L. Derbov and Aleksey I. Bychenkov "Astigmatic twisted beams: reducing the peak intensity in high-power waveguides", Proc. SPIE 4002, Saratov Fall Meeting '99: Laser Physics and Spectroscopy, (20 March 2000);

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