铟钬铌酸锂晶体的光谱特性

铟钬铌酸锂晶体的光谱特性摘要采用Czochralski提拉法生长出无宏观缺陷、光学质量较好的不同掺铟钬量的单晶In:Ho:LiNbO3。用X射线粉末衍射法，紫外可见吸收光谱，红外吸收光谱来研究In:Ho:LiNbO3的晶体结构，通过分析In+、Ho+掺杂浓度对OH吸收峰位峰位的影响，从而解释了In+、Ho3+在LiNbO3中的占位规律，结果表明Ho3+占据反位铌的位置，n3+占据Nb#位，而In浓度达到3mol%时，n3则占据Nb位。测试了晶体(300)面的X射线衍射，分析了n+、Ho3+掺杂浓度对衍射峰半高宽的影响，从而得知晶体结晶质量随3+、Ho3+摻杂浓度的升高而降低。用透射光斑畸变法测试了晶体的抗光损伤性能，研究了3+、Ho3+摻杂浓度对晶体抗光损伤能力的影响，结果表明晶品体抗光损伤能力随3+Ho3+掺杂浓度增大而提高，但Ho3+摻杂浓度超过1mol%后晶体抗光损伤能力变化不大。关键词In:Ho:LiNbO3晶体：光谱性能：Judd-Ofelt理论-I-Spectroscopic properties of In:Ho:LiNbO3AbstractSingle crystals with different indium holmium content without macroscopicdefect and with good optical quality were grown by Czochralski lifting methodIn:Ho:LiNbO3.X-ray powder diffraction,ultraviolet visible absorption spectrum andinfrared absorption spectrum were used to study In:Ho:By analyzing theinfluence of In3+and Ho3+doping concentration on the peak of OH-absorption,the occupying rule of In3+and Ho3+In LiNbO3 was explained.The resultsshowed that Ho3+occupied the position of antiniobium,In3+occupied theposition,and when the concentration of In reached 3 mol%,In3+occupies theNb bit.The X-ray diffraction of the crystal (300)plane was measured,and theinfluence of In3+and Ho3+doping concentration on the half-height and widthof the diffraction peak was analyzed.It is known that the crystal qualitydecreases with the increase of In3+and Ho3+doping concentration.The effect of In3+and Ho3+doping concentrations on the optical damageresistance of the crystal was studied by using the transmitted spot distortionmethod.The results show that the optical damage resistance of the crystalincreases with the increase of In3+and Ho3+doping concentrations,but theoptical damage resistance of the crystal changes little when the Ho3+dopingconcentration exceeds 1mol%.Keywords In:Ho:LiNbO3 crystal,Spectral property,Judd-Ofelt theory-Ⅱ-目录摘要a.mm.---m------m----m------.IAbstract.…Π第1章绪论51.1课题背景51.1.1研究意义51.1.2国内外研究现状分析1.1.3论文研究的主要内容…7第2章铌酸锂晶体生长及加工82.1实验材料的准备及配比方案82.2实验设备92.3晶体生长工艺92.3.1温度场的确定102.3.2晶体转速的选择102.3.3晶体生长速度的选择2.4晶体生长过程.…。.11122.4.1预烧结122.4.2熔料…122.4.3引晶122.4.4放肩132.4.5等径生长132.4.6拉脱132.4.7降温退火132.5晶体的加工处理132.5.1退火和极化处理132.5.2晶体加工152.6本章小结16第3章n:Ho:LiNbO3晶体结构与缺陷173.1引言173.2 LiNbO3晶体的结构和性能173.2.1 LiNbO3的晶体结构173.2.2铌酸锂晶体的缺陷结构183.2.3铌酸锂晶体的性能.203.2.4铌酸锂晶体的特点及应用20-Ⅲ-