Origin of thermal fixing in photorefractive lithium niobate crystals

被引:125
作者
Buse, K
Breer, S
Peithmann, K
Kapphan, S
Gao, M
Kratzig, E
机构
[1] Universität Osnabrück, Fachbereich Physik
来源
PHYSICAL REVIEW B | 1997年 / 56卷 / 03期
关键词
D O I
10.1103/PhysRevB.56.1225
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Macroscopic light patterns are thermally fixed in photorefractive iron- or copper-doped LiNbO3 crystals with different hydrogen concentrations. Spatially resolved absorption measurements reveal unambiguously that migrating hydrogen ions compensate for the space-charge fields at enhanced temperatures if the hydrogen concentration is large enough. However, in crystals with small hydrogen concentrations thermal fixing is also possible and another compensation mechanism appears. Partial depolarization of the crystals does not contribute to the charge compensation processes. The refractive-index pattern is developed by homogeneous illumination and measured by an interferometric technique. The development process is described considering the spatially modulated concentrations of filled and empty electron traps, which cause spatially modulated currents, even for homogeneous illumination.
引用
收藏
页码:1225 / 1235
页数:11
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