Improvement of the photorefractive response of Fe-doped KNbO3 crystals by MeV proton irradiation

被引：2

作者：

Fluck, D ^{[1
]}

Brülisauer, S

Günter, P

Buchal, C

Beckers, L

机构：

[1] ETH Honggerberg, Inst Quantum Elect, Nonlinear Opt Lab, CH-8093 Zurich, Switzerland

[2] Forschungszentrum Julich, ISI, IT,Inst Schicht & Ionentechnik, D-52425 Julich, Germany

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1999年 / 148卷 / 1-4期

关键词：

photorefractive; waveguide; proton implantation; potassium niobate; reduction process;

D O I：

10.1016/S0168-583X(98)00752-6

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We demonstrate that the photorefractive properties such as gain and response time in Fe-doped KNbO3 crystals can be greatly improved by MeV proton irradiation. The observed reduction of the crystals from p-type to n-type is caused by a change in the ratio of the densities of donors to accepters, denoted by the reduction ratio R = [Fe2+]/[Fe3+]. We have been able to change the reduction ratio R over orders of magnitude by proton implantation. The creation of oxygen vacancies is proposed to be responsible for the observed reduction. Based on our model. we determine key parameters of photorefractive Fe-doped KNbO3 crystals. such as dopant concentration, segregation coefficient, and optical absorption cross section. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：678 / 682

页数：5

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