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研究了非挥发全息记录中由于紫外光的强吸收而引起的光栅非均匀性,分析了这种非均匀性对光栅衍射效率的影响。结果显示,非均匀性致使光折变光栅的平均强度减弱,衍射效率降低。提出了采用两束等光强的敏化紫外光由晶体两侧入射的优化方案以改善光栅的均匀性,提高光栅的衍射效率。通过联立两中心带输运物质方程和双光束耦合波方程,进行了相应的理论模拟,并给出实验验证。结果表明双侧紫外光照射能够实现均匀性较好的光栅,是提高衍射效率的有效途径之一。
The non-uniformity of the grating due to the strong absorption of ultraviolet light in non-volatile holographic recording was studied. The effect of this non-uniformity on the grating diffraction efficiency was analyzed. The results show that the non-uniformity causes the average intensity of photorefractive gratings to be weakened and the diffraction efficiency to decrease. The optimization scheme of using two light intensities of sensitized UV light incident on both sides of the crystal is proposed to improve the uniformity of the grating and improve the diffraction efficiency of the grating. The corresponding theoretical simulations are carried out by using the equations of simultaneous transport of matter with the two centers and the coupling equations of the two beams, and experimental verification is given. The results show that bilateral UV irradiation can achieve better uniformity of grating, which is an effective way to improve the diffraction efficiency.