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采用提拉法生长了掺质量分数分别为0.01%,0.05%和0.10%Fe2O3的近化学计量比掺铁铌酸锂晶体(near stochiometric Fe:LiNbO3,Fe:NSLN)。采用633nm波长的激光作为光源,利用二波耦合实验和光斑畸变法研究了晶体的红光全息性能。结果显示:当铁含量小于0.05%时,随着铁含量的增加,晶体的写入时间和擦除时间变短,灵敏度增加,动态范围增大,最大衍射效率增强,抗光损伤能力降低。但当铁含量为0.10%时,最大衍射效率减小,抗光损伤能力急剧降低。结合晶体的结构缺陷模型对此现象进行了解释。
Near stochiometric Fe: LiNbO3 (Fe: NSLN) crystals with 0.01%, 0.05% and 0.10% Fe2O3 were grown by Czochralski method. Using the 633nm wavelength laser as the light source, the red holographic properties of the crystal were studied by the two-wave coupling experiment and the spot aberration method. The results show that when the iron content is less than 0.05%, the writing time and erasing time are shortened, the sensitivity is increased, the dynamic range is increased, the maximum diffraction efficiency is enhanced, and the ability to resist light damage is reduced with the increase of iron content. However, when the content of iron is 0.10%, the maximum diffraction efficiency decreases and the ability to resist light damage sharply decreases. This phenomenon is explained by the structural defect model of the crystal.