LiNbO_3∶Cr∶Cu晶体吸收特性及非挥发全息存储研究  

Absorption Characteristic and Nonvolatile Holographic Recording in LiNbO_3∶Cr∶Cu Crystals

作　　者：郭袁俊[1] 刘立人[1] 刘德安[1] 邓绍更[1] 职亚楠[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800

出　　处：《光子学报》2006年第12期1878-1883,共6页Acta Photonica Sinica

基　　金：科技部重大基础研究前期研究专项(2002CCA03500);国家自然科学基金(60177016)资助

摘　　要：研究了LiNbO3∶Cr∶Cu晶体的吸收特性,发现LiNbO3∶Cr∶Cu(含0.14wt.%Cr2O3和0.011wt.%CuO)晶体存在两个明显的吸收峰,中心波长分别位于480nm和660nm;随着Cr的含量逐渐减小,Cu的含量逐渐增大,短波段不存在明显吸收峰,掺Cr的含量越大,中心波长在660nm处的吸收越大;633nm红光虽然位于中心波长为660nm的吸收峰内,但它无助于光折变过程·分别采用390nm紫外光和488nm蓝光作为敏化光,514nm绿光作为记录光的记录方案,实现了非挥发全息记录,掺入适量的Cr(比如NCr=2.795×1025m-3,NCr/NCu=1)有助于全息记录性能的提高·Absorption characteristic.of lithium niobate crystals doped with chromium and copper （Cr and Cu） has been investigated. It is found that there are two apparent absorption bands for LiNbO3 ： Cr ： Cu crystal doped with 0. 14 wt. % Cr2O3 and 0. 011 wt. % CuO; one is around 480 nm, and the other is around 660 nm. With the decrease of doping composition of Cr and the iNcrease of doping composition of Cu, there doesn＇t exist an apparent absorption band in the shorter wavelength range. The higher the doping level of Cr, the larger the absorbancc around 660 nm. Though 633 nm red light locates in the absorption band around 660 nm, the absorption at 633 nm will not help the photorefractive process. For LiNbO3： ; Cr ： Cu crystals, by changing the recording light from 633 nm red light to 514 nm green light, sensitizing with 390 nm ultraviolet light and 488 nm blue light respectively, nonvolatile holographic recording can be realized. Doping appropriate Cr （for instance： NCr = 2. 795 ×10^23 m^-3 and NCr/NCu=1） benefits to the improvement of holographic recording properties.

关 键 词：全息光学 LiNbO2 :Cr: Cu晶体 吸收特性 非挥发全息记录 

分 类 号：O438.1[机械工程—光学工程]