Abstract. The spatial solitons are generated due to perfectly balance between the nonlinear effect and the diffraction in optical waveguide, when high energy optical beam propagated through it. When the medium's response of nonlinearity is instantaneous then it is called local nonlinear medium, otherwise it is called nonlocal nonlinear medium. An attempt has been made to investigate the propagation characteristics of Gaussian beam in highly nonlocal nonlinear media. The optical beam propagation has been modeled by well known nonlocal nonlinear equation (NNLSE). The variational method is employed to obtain various first order differential equations showing the variation of free pulse parameter along the propagation distance and critical power for soliton propagation has also been obtained.

Received: January 10, 2013

AMS Subject Classification: 78A60

Key Words and Phrases: nonlocal solitons, variational method

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