Dynamics of self-focusing and self-phase modulation of elliptic Gaussian laser beam in a Kerr-medium

TARSEM SINGH, NARESHPAL SINGH SAINI and SHYAM SUNDER KAUL*

Department of Physics, Guru Nanak Dev University, Amritsar 143 005, India

* Department of Physics, Sikh National College, Banga 144 505, India

Email: nspst99@yahoo.com

Abstract.

Using a direct variational technique involving elliptic Gaussian laser beam trial function, the combined effect of non-linearity and diffraction on wave propagation of optical beam in a homogeneous bulk Kerr-medium is presented. Particular emphasis is put on the variation of beam width and longitudinal phase delay with the distance of propagation. It is observed that no stationary self-trapping is possible. The regularized phase is also seen to be always negative.

Keywords: Self-focusing; elliptic; Kerr-medium; self-phase modulation.

Pacs No. 42.65