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从实验和理论分别获得甲基红掺杂聚乙烯醇薄膜的衍射效率 η随两 P偏振写入光夹角 2 θ的变化曲线 η- 2 θ,发现实验曲线的峰值相对理论曲线向小角度偏移 .将实验系统振动作为影响两曲线峰值偏移的重要因素 ,引入振动调制因子对样品衍射效率的理论公式进行了修正 ,缩小了理论曲线相对实验曲线的峰值偏移 .
The diffraction efficiency η of the methyl red-doped polyvinyl alcohol film was obtained experimentally and theoretically respectively. The peak value of the experimental curve relative to the theoretical curve was shifted to a small angle The vibration of the experimental system is taken as an important factor that affects the peak-to-peak shift of the two curves. The vibration modulation factor is introduced to correct the theoretical formula of the diffraction efficiency of the sample, and the peak offset of the theoretical curve from the experimental curve is reduced.