Ultraviolet photorefractivity features in doped lithium niobate crystals

被引:58
作者
Qiao, HJ
Xu, JJ [1 ]
Zhang, GQ
Zhang, XZ
Sun, Q
Zhang, GY
机构
[1] Nankai Univ, Coll Phys Sci, Photon Ctr, Tianjin 300071, Peoples R China
[2] Nankai Univ, TEDA Appl Phys Sch, Tianjin 300457, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
10.1103/PhysRevB.70.094101
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this work we studied photorefractive effect of lithium niobate (LiNbO3) doped with Zn, In, and Na at ultraviolet (UV) wavelength down to 351 nm. It is found that the UV photorefraction of LiNbO3 doped with Zn, In, or Na was enhanced significantly as compared to that of the nominally pure LiNbO3. Our results show that the statement that the property of resistance against photorefraction in highly Zn and In doped LiNbO3 is correct only in visible light range. By contrary, these crystals exhibit as excellent photorefractive characteristics in UV. We also find that there are doping concentration threshold values of Zn and In for the disappearance of the light-induced lens-like effect both in visible and in UV, but such concentration threshold values are not found for UV photorefraction within the highest doping concentrations we used. In highly Zn or In doped LiNbO3 crystals, diffusion dominates over photovoltaic effect and electrons are determined to be the dominant charge carriers in UV photorefraction. The results are of interest to the study on the defect structure of LiNbO3. Further investigation on this field is greatly urgent.
引用
收藏
页码:094101 / 1
页数:11
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