Propagation of Hermite-cosh-Gaussian laser beams in n-InSb

The propagation of Hermite-cosh-Caussian (HChG) laser beams in n-InSb are investigated for 0, 1 and 2 mode indices. The field distribution in the medium is expressed in terms of beam-width parameter f and decentred parameter b. The differential equations for f-parameter are established by parabolic wave equation approach under paraxial approximation. Analytical solutions are obtained under the condition R-n < R-d, where, R-n is the self-focusing length and R-d is the diffraction length. The behaviour of f-parameter with the dimensionless distance of propagation eta for various b values is examined by numerical estimates. The results are presented graphically. (C) 2008 Elsevier B.V. All rights reserved.