双掺杂LiNbO3微观光学参量对衍射效率的影响

通过联立两中心带输运物质方程和双光束耦合波方程，建立了双掺杂LiNbO3晶体采用双色光(紫外敏化光和HeiNe记录光)实现非挥发性全息存储的动力学模型。理论上分析了深、浅两杂质中心的微观光学参量(包括敏化光的深中心和浅中心光激发系数、记录光的浅中心光激发系数以及深中心和浅中心的电子复合系数)对记录饱和衍射效率和固定衍射效率的影响。数值计算表明，在双掺杂LiNbO3晶体的非挥发性全息存储中，为了得到高的固定衍射效率，应该选择复合系数较大、记录光激发系数较高、敏化光激发系数较低的浅杂质中心以及敏化光激发系数较高、复合系数最佳的深杂质中心。

Effect of Microcosmic Optical Parameters of Doubly Doped LiNbO3 on Diffraction Efficiency

By jointly solving the two center material equations and the coupled wave equations, a dynamic model to study the nonvolatile hologram realized by the two color recording scheme (UV light for sensitizing and He Ne laser for recording) in doubly doped LiNbO 3 crystals is set up. The aim is to study the effects of the microscopic optical parameters of the deep and shallow doping centers on the saturation and fixed diffraction efficiencies. These parameters include the photo excitation coefficients of deep and shallow centers for sensitizing light, the photo excitation coefficient of shallow center for recording light, and the electron recombination coefficients of deep and shallow centers. Numerical solutions show that, for the nonvolatile holographic storage in doubly doped LiNbO 3 crystals, in order to obtain high fixed diffraction efficiency, one should select the shallow center with large electron recombination coefficient, with high photo excitation coefficient for recording light and with low photo excitation coefficient for sensitizing light; and select the deep center with high photo excitation coefficient for sensitizing light and with optimal electron recombination coefficient.