Dynamics of ultraslow optical solitons in a cold three-state atomic system
Dynamics of ultraslow optical solitons in a cold three-state atomic system
复制标题
冷三态原子系统中超慢光孤子的动力学
DOI：
10.1103/physreve.72.016617
复制
发表时间：
2005-07-01
影响因子：
2.4
通讯作者：
Payne, MG
中科院分区：
文献类型：
--
作者：
Huang, GX;Deng, L;Payne, MG
本文系统地研究了在拉曼激发下，高共振三态冷原子系统中的超慢光孤子的动力学。使用多尺度方法，我们推导出一个修改后的非线性薛定谔方程与高阶修正，描述的线性和微分吸收，非线性色散，非线性折射率的延迟响应，衍射和三阶色散的影响。将这些效应视为微扰，利用标准孤子微扰理论详细研究了超慢光孤子的演化。结果表明，由于这些高阶修正，超慢光孤子发生形变，传播速度发生变化，振荡频率发生偏移。此外，孤子还产生由色散波叠加的小辐射。研究结果对冷原子系统中超慢光孤子的实验研究具有一定的指导意义。
We present a systematic study on the dynamics of a ultraslow optical soliton in a cold, highly resonant three-state atomic system under Raman excitation. Using a method of multiple scales we derive a modified nonlinear Schrodinger equation with high-order corrections that describe effects of linear and differential absorption, nonlinear dispersion, delay response of nonlinear refractive index, diffraction, and third-order dispersion. Taking these effects as perturbations we investigate in detail the evolution of the ultraslow optical soliton using a standard soliton perturbation theory. We show that due to these high-order corrections the ultraslow optical soliton undergoes deformation, change of propagating velocity, and shift of oscillating frequency. In addition, a small radiation superposed by dispersive waves is also generated from the soliton. The results of the present work may provide a guidance that is useful for experimental demonstration of ultraslow optical soliton in cold atomic systems.