Two-dimensional modeling of transient gain gratings in saturable gain media.
Two-dimensional modeling of transient gain gratings in saturable gain media.
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DOI：
10.1364/oe.20.006887
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发表时间：
2012-03
期刊：
影响因子：
3.8
通讯作者：
R. Elsner;R. Ullmann;A. Heuer;R. Menzel;M. Ostermeyer
中科院分区：
文献类型：
--
作者：
R. Elsner;R. Ullmann;A. Heuer;R. Menzel;M. Ostermeyer
提出了一种描述饱和增益介质内简并四波混频的二维暂态模型。将新模型与现有的一维模型进行了比较，并对定性结果进行了验证。在峰值反射率和最佳泵浦通量方面，观察到了很大的定量差异。在此基础上，利用改进的模型研究了光束焦距、横向位置和交叉角对光栅反射率的影响。结果表明，位相共轭反射率敏感地依赖于相互作用光束的横向特征，泵浦光束的位置发生横向移动，反射率提高三倍。
A transient two-dimensional model describing degenerate four-wave mixing inside saturable gain media is presented. The new model is compared to existing one-dimensional models with their qualitative results confirmed. Large quantitative differences with respect to peak reflectivity and optimum pump fluence are observed. Furthermore, the influence of the beam focus size, the transverse position and the crossing angle on the reflectivity of the grating is investigated using the improved model. It is demonstrated that the phase conjugate reflectivity depends sensitively on the transverse features of the interacting beams with a transverse shift in the position of the pump beams yielding a threefold improvement in reflectivity.