通过数值仿真研究了高斯光束在贝塞尔晶格中的传输特性，贝塞尔晶格是在光折变晶体中通过光诱导产生的。在有晶格和无晶格的情况下，高斯光束的传输特性有很大差别。高斯光束在均匀介质中传输时会呈现出线性衍射和自聚焦现象，当晶体中存在晶格时，光束可以克服光在均匀介质中的衍射和自聚焦效应，在不同的初始输入条件下，高斯光束在传输的过程中会演变成一个环形孤子或者圆形孤子。

The numerical analysis of the dynamics of a Gaussian beam in Bessel lattices which are induced by transvering the focusing photorefractive nonlinearity crystal is presented. The propagation properties of the Gaussian beam can be different with and without the lattices. In the absence of the lattice, the beam will present linear diffraction and nonlinear focusing in a homogeneous medium. The beam can overcome these effects in a homogeneous medium after transfering in a crystal with lattices. With different initial input conditions in the case of lattices, the input beam can overcome these effects and form a ring-shaped soliton or a circle-shaped soliton.