采用365nm的门光束和633nm的记录光,在双掺杂LiNbO3:Ce:Cu晶体中实现厂全息图像的双色记录和无损读出。探讨了双色存储全息图的图像保真度,采用信噪比(SNR)损失描述双色固定过程对全息图像的像质影响。利用角度寻址器件,采用等时曝光时序,实现了50幅全息图像的双色复用记录和同定.并对其噪声的特点进行了初步分析。结果表明.固定后50幅全息图像的信噪比损失平均值为1.14;50幅仓息图像的衍射效率基本相等.平均衍射效率达7.64×10^-6。
Two-color holographic image storage was performed experimentally in LiNbO3: Ce: Cu crystal (w(Ce) : 0. 085%, w(Cu) : 0. 011%) with gating light at 365 nm and recording light at 633 nm, and the image fidelity of the hologram was analyzed. The loss of signal to-noise ratio (SNR) (LXNR) was used in comparing the noise performance of holograms before and after fixing. 50 angle multiplexed holograms with almost equal diffraction efficiencies were multiplexed in a LiNbO3: :Ce:Cu crystal with equivalent exposure schedule. And their average LSNR is 1.14, and the average efficiency reaches 7.64×10 ^-6.