Li/Nb比变化对Ce:Fe:LiNbO_3晶体的光折变性能的影响  

Influence of Li/Nb Ratio Changes in Ce:Fe:LiNbO_3 Crystals on Photorefractive Performance

作　　者：于晓艳[1] 荣宪伟[1] 关承祥[1] 赵朝中[1] 

机构地区：[1]哈尔滨师范大学理化学院物理系,哈尔滨150080

出　　处：《人工晶体学报》2008年第3期538-542,537,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金资助项目(No.60777006);黑龙江省自然科学基金资助项目(No.GC06A114);黑龙江省教育厅科学技术项目(No.11531250);哈尔滨师范大学科研基金(KM2007-07)

摘　　要：在LiNbO3晶体中掺进0.1wt%CeO2和0.03wt%Fe2O3以Czochralski技术生长不同Li/Nb比(0.94、1.20、1.40)Ce:Fe:LiNbO3晶体,其中Li/Nb=1.40的Ce:Fe:LiNbO3晶体是化学计量比。测试了不同Li/Nb比Ce:Fe:LiNbO3晶体抗光损伤能力,得到随着Li/Nb比的增加,晶体的抗光损伤能力增加。研究了晶体抗光损伤能力增强的机理。随着Li/Nb比的增加,晶体的响应速度和光折变灵敏度增加。测试不同Li/Nb比Ce:Fe:LiNbO3晶体位相共轭效应,利用产生的位相共轭光波消除图像的位相共轭畸变。利用Li/Nb=1.40的Ce:Fe:LiNbO3晶体做记录介质,Li/Nb=1.20的Ce:Fe:LiNbO3晶体作位相共轭镜进行全息关联存储实验。实验结果表明,存储系统具有实时处理,成像质量好,信噪比高和可反复使用的优点。The 0.1wt% CeO2 and 0.03wt% Fe2O3 are doped in LiNbO3 crystals,and then Ce：Fe：LiNbO3 crystals with various Li/Nb ratios（0.94,1.20,1.40）were grown by the Czochralski technique,in which Ce：Fe：LiNbO3 crystals doping a Li/Nb ratio of 1.40 is near stoichiometry.It can be derived from measurement made that the photo-damage resistance ability of Ce：Fe：LiNbO3 crystals become larger along with increased Li/Nb ratios and its enhancing mechanism is thus investigated.Moreover,both the response speed and photorefractive sensitivity of crystals are improved along with increased Li/Nb ratios.The phase conjugation effect of Ce：Fe：LiNbO3 crystals doped with various Li/Nb ratios was measured and phase conjugation distortion of image is eliminated by a phase conjugation wave produced.Furthermore,holographic association storage experiments are performed using the Ce：Fe：LiNbO3 crystals doped a Li/Nb ratio of 1.40 as a recording medium and the Ce：Fe：LiNbO3 crystals doped a Li/Nb ratio of 1.20 as phase conjugation mirror.Experimental results illustrated that the storage system possesses many superior features such as real-time processing,good image quality,high signal-to-noise ratio and repetitive usage.

关 键 词：CE:FE:LINBO3晶体 光折变性能 抗光损伤能力 

分 类 号：O78[理学—晶体学]