Elsner Robert, Ullmann Roland, Heuer Axel, Menzel Ralf, Ostermeyer Martin
1University of Potsdam, Karl-Liebknecht-Str. 24/25, 14467 Potsdam, Germany.
Opt Express. 2012 Mar 26;20(7):6887-96. doi: 10.1364/OE.20.006887.
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.
提出了一个描述饱和增益介质内简并四波混频的瞬态二维模型。将新模型与现有的一维模型进行了比较，证实了它们的定性结果。观察到在峰值反射率和最佳泵浦通量方面存在较大的定量差异。此外，使用改进后的模型研究了光束聚焦尺寸、横向位置和交叉角对光栅反射率的影响。结果表明，相位共轭反射率敏感地依赖于相互作用光束的横向特征，泵浦光束位置的横向偏移使反射率提高了三倍。
