Mg：Fe：LinbO_3晶体光折变增强效应的研究

在铌酸锂晶体中掺ＭｇＯ和Ｆｅ２Ｏ３，生长出Ｍｇ：Ｆｅ：ＬｉＮｂＯ３晶体．由于薄晶片的光爬行效应，晶体的二波耦合指数增益系数高达８０ｃｍ－１，且角度响应范围加宽，响应速度和抗光散射能力都比Ｆｅ：ＬｉＮｂＯ３有较大改善．以Ｍｇ：Ｆｅ：ＬｉＮｂＯ３晶体作光放大器，实现了一次迭代全息关联存储．

STUDY ON THE ENHANCEMENT OF PHOTOREFRECTIVE EFFECT OF Mg: Fe: LiNbO_3 CRYSTAL

With MgO and Fe2O3 doped into LiNbO3 ,the Mg: Fe: LiNbO3 crystal was grown. The highest exponential gain coefficient (r=80cm-1 ) was measured in a thin Mg :Fe: LiNbO3 sample,of which the thickness was 0. 2mm. The sample showed high gain coefficient within a wide angular range. These features were explained by the effect of light crawling, which originated from light scattering with large angles. The response speed and the ability of anti-scattering of Mg:Fe:LiNbO3 were improved as compased with Fe:LiNbO3. The once iteration of output in real-time holographic associative memory was implemented by using Mg:Fe:LiNbO3 as a photorefractive amplifier.