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从Kukhtarev方程组和基于载流子光伏迁移机制的简化模型出发,对不同强度分布的片光在LiNbO3:Fe晶体中导致的折射率变化分布进行了理论分析.数值模拟的结果与简化模型得出的解析表达式相吻合.采用切片干涉法对矩形、Gauss和平方律分布的片光辐照LiNbO3:Fe晶体导致的折射率变化进行了实验测量.利用理论分析得到的解析表达式很好地拟合了测量数据点.根据衍射的角谱理论和射线方程分别对写入光强度分布沿传播方向上的一致性以及晶体自散焦效应的影响进行了数值模拟,结果表明实验测量的结果是可靠的.因而在LiNbO3:Fe晶体中可以通过改变写入光的强度分布得到不同的折射率变化分布,利用数值模拟或由简化模型得出的解析表达式可以对给定强度分布的片光导致的折射率变化分布进行预测.
Based on the Kukhtarev equation and the simplified model based on carrier photovoltaic (PV) transport mechanism, the distribution of refractive index changes induced by LiNbO3: Fe crystals with different intensity distributions is analyzed theoretically.The results of numerical simulation and simplified model The analytical expressions of the LiNbO3: Fe crystals are experimentally measured by the slice interferometry with the rectangular light, the Gauss and the square law of the distribution of the plate light irradiation, and the analytic expression obtained by theoretical analysis is well The measured data points are combined.According to the diffraction angle-angle theory and the ray equation, the numerical simulation of the consistency of the written light intensity along the propagation direction and the self-defocusing effect of the crystal are carried out respectively. The results show that the experimental measurement results are reliable . Therefore, different refractive index change distributions can be obtained by changing the intensity distribution of written light in LiNbO3: Fe crystals. Using numerical simulations or analytical expressions derived from simplified models, it is possible to obtain a Refractive index change distribution to predict.