Maufoy J, Fressengeas N, Wolfersberger D, Kugel G
Supélec, 2 rue Edward Belin, 57078 Metz Cedex 3, France.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 1999 May;59(5 Pt B):6116-21. doi: 10.1103/physreve.59.6116.
We consider the propagation of light beams in photorefractive media in the framework of a (1+1)-dimensional model. The Kukhtarev band transport model is introduced both in a time-dependent differential equation describing the evolution of the space charge field and in a nonlinear wave propagation equation. This latter is then numerically solved with a beam propagation method routine. The evolution in time and space of an initially diffracting laser beam is simulated as a function of initial profiles and waists. The beam is shown to go through a transient overfocused state prior to relaxing to a steady state soliton. Additional features such as the stability condition of the system or effects such as optical branching and soliton interactions are studied.
我们在(1 + 1)维模型的框架内考虑光束在光折变介质中的传播。库赫塔廖夫能带输运模型既被引入到描述空间电荷场演化的含时微分方程中，也被引入到非线性波传播方程中。然后使用光束传播方法程序对后者进行数值求解。根据初始轮廓和束腰模拟初始衍射激光束在时间和空间上的演化。结果表明，光束在弛豫到稳态孤子之前会经历一个瞬态过聚焦状态。还研究了系统的稳定性条件等附加特征以及诸如光分支和孤子相互作用等效应。
