自衍射中的槽包络相位效应理论
Theory of groove-envelope phase effects in self-diffraction
摘要：
当两束激光在介质中以小角度相交时，激光感生光栅仅由少量的沟槽组成。在这种情况下，光栅的凹槽与其包络之间的相位是非线性效应的决定性参数。在这里，模型被建立用于再现已经在自衍射干涉图样中观察到的沟槽包络相位效应。四波混频导致在衍射级之间的空间区域中占主导地位的干涉，并且在横向坐标与脉冲延迟的图中具有倾斜的干涉条纹。垂直干涉条纹，直接占主导地位的衍射级，实验观察到在高强度接近损伤阈值，需要一个超越四波混频的模型。一个模型的建议，是基于光传输的变化与限制在介质中的区域小于槽间距。
英文摘要：
If two laser beams cross in a medium under shallow angle, the laser-induced grating consists of only a few grooves. In this situation, the phase between the grooves of the grating and its envelope is a decisive parameter for nonlinear effects. Here, models are established for reproducing the groove-envelope phase effects that have been observed in the interference pattern of self-diffraction. Four-wave mixing leads to interferences that are dominant in the spatial region between the orders of diffraction and with tilted interference fringes in the diagram of transverse coordinate vs. pulse delay. The vertical interference fringes that are dominant directly on the diffraction orders, experimentally observed at high intensity close to the damage threshold, require a model beyond four-wave mixing. A model is suggested that is based on optical transmission changes with confinement to regions in the medium that are smaller than the groove spacing.
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