Improvement in refractive-index change in LiNbO3:Ce:Cu by applying an external electric field

• 来源期刊: 中国物理(英文版)
• 关键词: non-volatile holographic recording external electric field refractive-index change LiNbO3:Ce:Cu crystals
• 年，卷（期）: 2005,（12）
• 页码范围: 2491-2495
• 页数: 5页
• 语种: 英文

摘要

By jointly solving two-centre material equations with a nonzero external electric field and coupled-wave equations,we have numerically studied the dependence of the non-volatile holographic recording in LiNbO3:Ce:Cu crystals on the external electric field. The dominative photovoltaic effect of the non-volatile holographic recording in doubly doped LiNbO3 crystals is directly verified. And an external electric field that is applied in the positive direction along the c-axis (or a large one in the negative direction of the c-axis) in the recording phase and another one that is applied in the negative direction of the c-axis in the fixing phase are both proved to benefit strong photorefractive performances.Experimental verifications are given with a small electric field applied externally.