摘要
在Mn∶Fe∶LiNbO3晶体中加入抗光折变元素铟,使用Czochralski法生长In∶Mn∶Fe∶LiNbO3晶体,并对晶体进行氧化还原处理,测试了晶体紫外-可见吸收光谱.结果表明:铟的掺入使晶体吸收边发生移动,生长态晶体吸收边稍向紫移,氧化处理晶体吸收边紫移程度较大,还原处理晶体吸收边红移.通过二波耦合实验,使用输出功率30 mW的He-Ne激光器进行单光写入与擦除实验,测试了晶体记录过程中的响应时间与擦除时间.研究结果表明:In3+的掺入可通过提高擦除时间与响应时间之比,较大地提高晶体的动态范围;用生长态摩尔分数1%的In∶Mn∶Fe∶LiNbO3晶体进行擦除时,衍射效率达到30%,衍射效率不随时间变化.
With high diffraction efficiency, exponential gain non-volatile holographic storage, In： Mn： Fe： LiNbO3 crystal coefficient, concentration of efficiency carrier and is a good photo-holographic material. But because of its small dynamic range, its application is restricted. In： Mn： Fe： LiNbO3 crystals were grown by Czochralski method and some of the samples were oxidized and reduced. Their absorption spectra were measured by means of UV-Visible spectrophotometer. The results showed that the absorption edge shifted with the doping of In iron, crystals as-grown and oxidized were Violet shift and crystals reduced were Einstein shift. The oxidized crystals shifted greater than the as-grown ones. Writing time and erasure time of crystals were measured by two-beam coupling experiment, and the writing and erasure experiment with one beam was done with the He- Ne laser. The results showed that the dynamic range improved through increasing the ratio of erasure time and writing time, the diffraction efficiency of the In（ 1 mol% ） Mn： Fe： LiNbO3 crystal reached around 30% , which didnt change with time.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2006年第3期279-281,286,共4页
Materials Science and Technology
基金
哈尔滨市科技攻关资助项目(2005AA5CG058)
