High photorefractive sensitivity and fast response time of near-stoichiometric and MgO doped LiNbO3:Fe crystals by Shaolin Chen, Hongde Liu, Yongfa Kong, Ziheng Huang, and Jingjun Xu

Crystal Research and Technology

Cryst. Res. Technol. 41, 790 (2006) - Abstract -

High photorefractive sensitivity and fast response time of near-stoichiometric and MgO doped LiNbO₃:Fe crystals

Shaolin Chen, Hongde Liu, Yongfa Kong, Ziheng Huang, and Jingjun Xu

The Key Laboratory of Advanced Technique and Fabrication for Weak-Light Nonlinear Photonics Materials, Ministry of Education, Nankai University, Tianjin 300457, China

Keywords	lithium niobate, near stoichiometry, response time, photorefractive sensitivity
PACS	42.70.Ln, 42.40.Lx, 42.65.Hw
DOI	10.1002/crat.200510670

Congruent LiNbO₃:Fe and LiNbO₃:Mg,Fe crystals were grown by Czochralski method, and vapor transport equilibration technique was employed to improve the [Li]/[Nb] ratios of these crystals. The influence of stoichiometry and MgO dopant on the photorefractive sensitivity and response time of LiNbO₃:Fe crystals was investigated. Both stoichiometry and MgO dopant can effectively reduce the amount of intrinsic defects, but MgO can also decrease the concentration of Fe²⁺ ions in Li-sites. Near-stoichiometric and MgO doped LiNbO₃:Fe crystal has high photorefractive sensitivity and fast response time.

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