强非局域非线性介质中拉盖尔-高斯型光孤子相互作用

摘要

Based on the modified Snyder-Mitchell model,the optical fields that are produced by two collinear Laguerre-Gaussian solitons （LGS） in a strongly nonlocal nonlinear medium are studied.Various novel kinds of solitons on the profiles which depend on the model-index and the relative amplitude of LGS are shown.It is the phase vortices of the LGS that lead to the optical singularities.The many-ring soliton is produced first with the collinear component LGS.The optical field may rotate in propagation,and the angular velocity of the spiral soliton is given.%利用强非局域非线性介质中傍轴光束传输的线性模型（修正的Snyder-Mitchell模型）讨论了两束共线（即光束中心和传输方向都相同）拉盖尔-高斯型光孤子的传输过程.改变双光束的相对阶数和相对强度比,叠加光场在传输截面上的光强分布呈现出多样性,通过叠加的方法在该介质中产生了多环形光孤子.一定条件下传输光束在传输过程中会出现旋转现象,叠加光场成为旋转光场,给出了旋转光束的旋转条件以及旋转速度.进一步利用拉盖尔-高斯光束在传输过程中特有的螺旋相位特点分析了光场截面强度多样性产生的物理机理.