采用提拉法,从Li/Nb变化(0.94,1.05,1.20,1.38)的熔体中生长出Mg:Sc:Fe:LiNbO3晶体.Li/Nb=1.05的晶体OH-振动吸收峰在3504cm-1处出现的主吸收峰,且在3466cm-1、3481m-1处有两附加峰.Li/Nb=1.38的晶体OH-振动吸收峰在3535cm-1处出现附加吸收峰.红外光谱结果表示Li/Nb=1.05的晶体是近化学剂量比的,且Sc掺质优先于Mg掺质达到阈值浓度.采用透射光斑畸变法测得Mg:Sc:Fe:LiNbO3晶体(Li/Nb=1.05)的抗光损伤能力为2.0×104W/cm2,比Fe:LiNbO3提高了三个数量级.采用波长为632.8nm的He-Ne激光器作为光源,通过二波耦合方法测试晶体全息存储性能.实验结果表明:随着Li/Nb的增加,晶体的写入时间缩短,晶体的衍射效率降低,光折变灵敏度增加,动态范围减少.在一系列晶体中,Mg:Sc:Fe:LiNbO3晶体(Li/Nb=1.05)更加适合作为全息存储介质.
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