Study On The Evolution And Propagation Characteristics Of Gaussian Beams In A Series Photorefractive Crystal Circuit

In recent years,the theory and application of optical soliton have made a huge progress,photorefractive spatial solitons have been a topic of research in the nonlinear optics since the 1990 s.However,in the study of the photorefractive spatial solitons in the reality,the incident beam on the photorefractive crystal is often not solitary wave,but the Gaussian beams.The research about the dynamical evolution and self-deflection of the Gauss beams in this article and mainly through the following aspects:(1)The basic knowledge of the photorefractive spatial solitons(2)the uniform theory of separate spatial soliton pairs.(3)The interaction between two solitons in one separate spatial soliton pair and forming conditions of separate spatial soliton pair in different kinds of serial crystal circuit.(4)The effect of the input intensity of the dark soliton or dark soliton crystal temperature on the dynamical evolution of solitons or Gauss beams in the other crystal,these are what we focus on in this article.Based on the theory of separate spatial soliton pairs and the evolution of Gaussian beams in a photorefractive crystal,we investigate the effect of the dark soliton crystal temperature or the input intensity on the dynamical evolution and self-deflection of Gaussian beams numerically,these are very important and have not been researched previously.The results of my research are as follows,(1)The input intensity of the dark solitons can affect the dynamical evolution of bright solitons in the other crystal,whereas the bright one cannot in the separate spatial soliton pair.(2)Varying the temperature of the dark soliton crystal or input intensity of the dark soliton can modulate the dynamical evolution of Gaussian beams in the other crystal.For example,the matched Gaussian beams cannot evolve into a solitary wave when the change of the dark soliton crystal temperature is large enough and a mismatched Gaussian beam can evolve into a stable bright soliton by adjusting the temperature or input intensity of the dark soliton.(3)The temperature of the dark soliton crystal or input intensity can strongly affect the self-deflection of Gauss beams in the other crystal.