近化学计量比LiNbO3晶体的生长及其组分测定

人工晶体学报, 2001, 30(2): 129-134. doi: 10.3969/j.issn.1000-985X.2001.02.004

近化学计量比LiNbO3晶体的生长及其组分测定

陈晓军 ^1, , 李兵 ^2, , 朱登松 ^3, , 李冠告 ^4, , 陈绍林 ^5, , 黄自恒 ^6, , 吴仲康 ^7,

1.南开大学物理科学学院,

2.南开大学物理科学学院,

3.南开大学物理科学学院,

4.南开大学物理科学学院,

5.南开大学物理科学学院,

6.南开大学物理科学学院,

7.南开大学物理科学学院,

基金项目: 国家重点基础研究发展计划(973计划)(1999033004) 国家自然科学基金(699080030) 国家高技术研究发展计划(863计划)(863-715-001-0102)

关键词：铌酸锂晶体 , 化学计量比 , 晶体生长

Growth of Near-stoichiometric LiNbO3 Crystal and Composition Determination

铌酸锂晶体(LiNbO3)是一种典型的非化学计量比晶体，通常所使用的同成分LiNbO3晶体中的锂铌比(［Li］/［Nb］)约为48.6/51.4。我们利用提拉法，从掺入11mol%k2O的同成分LiNbO3熔体中生长出了高光学质量的近化学计量比LiNbO3单晶。与同成分LiNbO3晶体相比，其吸收边向短波方向移动；E模(153cm-1)喇曼谱线宽从9.4cm-1降低到了7.0cm-1，A1模(876cm-1)喇曼谱线宽从25.5cm-1降低到了20.0cm-1；产生532nm～1064nm 2次谐波的相匹配温度从室温增加到了155.5℃；OH-红外吸收谱线宽明显变窄，波形也有明显的变化。这些结果表明这种LiNbO3晶体中的LiO2含量为49.6mol%，即［Li］/［Nb］为0.984，接近其化学计量比

Lithium niobate(LiNbO3) crystal is a kind of typical non-stoichiometric crystal,and generally used one is congruent crystal with ［Li］/［Nb］ ratio of about 48.6/51.4.In this paper,we report that near-stoichiometric LiNbO3 crystal is grown with Czochralski method from a congruent melt with addition of 11mol% K2O.In comparison with congruent one,the position of absorption edge moves to short wave,Ramam linewidth decreases from 9.4cm-1 to 7.0cm-1 for the E mode(153cm-1) and from 25.5cm-1 to 20.0cm-1 for the A1 mode (876cm-1).Its phase-matching temperature for 1064-532nm second harmonic generation increases from room temperature to 155.5℃ and its OH- infrared absorption band is changed distinctly in shape.The linewidth also becomes greatly narrower.According to these measurements,the lithium oxide content in crystal can be estimated to be about 49.6mol%,which is closed to the ideal stoichiometry of LiNbO3 crystal.

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