Properties of spatial optical solitons to different degrees of nonlocality

Abstract

The propagation of optical beams in nonlocal nonlinear media is modeled by the nonlocal nonlinear Schrdinger equation.In this paper,discussed is the propagation properties of the optical spatial solitons in the media to different degrees of the nonlocality.An iteration algorithm based on the split_step Fourier method is presented to obtain the solutions of the solitons. The profiles of the solitons to different degrees of the nonlocality are numerically obtained in the assu mption that nonlinear response of the media is Gaussian. The stability of the so lutions is also demonstrated numerically,which shows that the stable solitons ca n survive to different degrees of nonlocality. The amplitude profiles of the sol iton transit gradually and continuously from a Gaussian function in the strongly nonlocal case into a hyperbolic secant function in the local case. The critical power for the solitons decreases as the nonlocality decreases. The weaker the n onlocality,the slower the soliton phase that has a linear relation with the prop agation distance increases.