光子学报, 2010, 39 (7): 1253, 网络出版: 2010-08-31
锂铌比对铪铁铌酸锂晶体全息存储性能的影响
Effect of ［Li］/［Nb］ on the Holographic Storage Properties in LiNbO3:Fe:Hf Crystals
摘要
以掺杂4 mol%Hf4+的LiNbO3:Fe:Hf系列晶体(［Li］/［Nb］比变化)为研究对象，研究了系列晶体的可见吸收光谱，在632.8nm的写入光下晶体的衍射效率、灵敏度和抗光散射能力在不同［Li］/［Nb］下的变化规律.研究发现Hf4+的浓度达到阈值浓度后，随着［Li］/［Nb］比的增大，晶体的可见吸收边会发生红移，而且晶格中［Fe2+］/［Fe3+］也会增加，这就导致随着［Li］/［Nb］比的增加，样品的衍射效率逐渐减小，写入时间缩短，灵敏度增大.同时，在晶体中，随着［Li］/［Nb］的增大，陷阱中心Fe2+Li数量增大会使得晶体抗光散射能力减弱.
Abstract
Holographic storage properties and Ultraviolet-Visible absorption spectra of LiNbO3:Fe:Hf crystals adoped with Hf(4 mol%) are measured and analysised.Ultraviolet-Visible absorption edges obviously shift to long waveleng.The ratio of ［Fe2+］/［Fe3+］ increases with the increasing of ［Li］/［Nb］,which results in the deceasing of diffraction efficiency,and improving response speed and sensitivity.Moreover,the ability of light scattering resistance decreased with the increasing of ［Li］/［Nb］.It is contributed to the change of Fe2+Li concentration in crystals.
高丽玮, 孟庆鑫, 石宏新, 孙秀冬. 锂铌比对铪铁铌酸锂晶体全息存储性能的影响[J]. 光子学报, 2010, 39(7): 1253. GAO Li-wei, MENG Qing-xin, SHI Hong-xin, SUN Xiu-dong. Effect of ［Li］/［Nb］ on the Holographic Storage Properties in LiNbO3:Fe:Hf Crystals[J]. ACTA PHOTONICA SINICA, 2010, 39(7): 1253.
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