饱和非线性介质中艾里孤子的产生与传输调控

Generation and Propagation Regulation of Airy Solitons in Saturable Nonlinear Medium

采用分步傅里叶法,通过数值模拟研究了饱和非线性介质中艾里孤子的产生与传输调控。单艾里光束入射时,在一定的初始振幅范围内可以产生稳定传输的呼吸式孤子。初始振幅增加时,孤子的强度增加,呼吸周期变短,但宽度基本保持不变。衰减系数增加时,孤子的平均峰值强度先增大后减小之后再增大,存在两个极值点。光束入射角度为负值时,形成左倾艾里孤子;光束入射角度为正值时,形成右倾艾里孤子。双艾里光束入射时,入射角同为负值可以减弱光束间的相互作用,入射角同为正值可以增强光束间的相互作用。此外,不同的入射角可以控制孤子或孤子对的传输方向。

The generation and propagation regulation of Airy solitons in saturable nonlinear medium are numerically investigated by split-step Fourier method.For a single incident Airy beam,stably propagated breathing solitons are generated within a certain initial amplitude range.The intensity of solitons increases and breathing period decreases with the increase of initial amplitude,but the solitons width remains unchanged.With the increase of decay coefficient,mean peak intensity of the solitons has two extreme values,and it is found to first increase,then decrease and increase again.Left tilted Airy solitons can be generated with a negative launch angle,and right tilted Airy solitons can be generated with a positive launch angle.When two incident Airy beams interact with each other,the interaction can be weakened with the same negative launch angles,and the interaction can be strengthened with the same positive launch angles.Furthermore,the propagation direction of solitons or soliton pairs can be controlled by different launch angles.