LiNbO(3):Hf 的紫外光光折变性能研究。

Investigations on the UV photorefractivity of LiNbO(3):Hf.

机构信息

School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China.

出版信息

Opt Lett. 2010 Feb 15;35(4):601-3. doi: 10.1364/OL.35.000601.

DOI:10.1364/OL.35.000601

PMID:20160831

Abstract

The UV photorefractivity of LiNbO(3):Hf was investigated by beam distortion and two-wave coupling experiments. A sharp decrease of beam distortion was found between Hf concentrations of 2 and 2.5 mol.%, indicating a significant increase of photoconductivity there. The energy-transfer direction of the two-wave coupling and the effect of chemical reduction on the UV photorefractivity reveal that electrons are the carriers responsible for the UV photorefraction. Moreover, dissimilar with LiNbO(3) highly doped with Mg, Zn, and In, the grating recorded in LiNbO(3):Hf was found to be nearly stable in the dark but sensitive to red light, which can be attributed to the special location of Fe ions in the crystal lattice.

摘要

采用光束变形和双波耦合实验研究了 LiNbO(3):Hf 的紫外光光折变性能。在 Hf 浓度为 2mol%和 2.5mol%之间，发现光束变形明显减小，表明该处的光导电性显著增强。双波耦合的能量传递方向以及化学还原对紫外光光折变性能的影响表明，电子是产生紫外光光折射的载流子。此外，与 Mg、Zn 和 In 高度掺杂的 LiNbO(3)不同，LiNbO(3):Hf 中记录的光栅在黑暗中几乎稳定，但对红光敏感，这可归因于 Fe 离子在晶格中的特殊位置。