Photorefractive properties of lithium and copper in-diffused lithium niobate crystals

被引：18
作者：
Imbrock, J [1 ]
Wirp, A
Kip, D
Krätzig, E
Berben, D
机构：
[1] Univ Osnabruck, Fachbereich Phys, D-49069 Osnabruck, Germany
[2] Univ Bonn, Inst Phys, D-53115 Bonn, Germany
来源：
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2002年 / 19卷 / 08期
关键词：
D O I：
10.1364/JOSAB.19.001822
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Near-stoichiometric copper-doped lithium niobate crystals are fabricated by in-diffusion of thin layers of evaporated copper and a subsequent vapor transport equilibration treatment. The crystals are heated in a Li-rich atmosphere to increase the Li content. To determine the photorefractive properties, holographic as well as electrical measurements are performed. Saturation values of the refractive-index changes Deltan(S), bulk photovoltaic current densities j(phv), photoconductivities sigma(ph), and holographic sensitivities S are measured for light intensities up to 10(4) W/m(2). Comparison with experimental data of congruent crystals indicates that the specific photoconductivity is 15 times larger after a vapor transport equilibration treatment. The specific bulk photovoltaic coefficient beta* is 2 times larger, refractive-index changes are 7 times smaller, and the holographic sensitivity is up to 4 times larger. (C) 2002 Optical Society of America.
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收藏
页码：1822 / 1829
页数：8
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