| 近化学计量比LiNbO3晶体的生长及其组分测定 |
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| 引用本文： | 陈晓军,李兵,朱登松,李冠告,陈绍林,黄自恒,吴仲康.近化学计量比LiNbO3晶体的生长及其组分测定[J].人工晶体学报,2001,30(2):129-134. |
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| 作者姓名： | 陈晓军 李兵 朱登松 李冠告 陈绍林 黄自恒 吴仲康 |
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| 作者单位： | 南开大学物理科学学院, |
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| 基金项目： | 国家自然科学基金(No.699080030),国家863计划(NO.863-715-001-0102),973计划(No.1999033004)资助项目 |
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| 摘 要： | 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-1064nm2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。
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| 关 键 词： | 铌酸锂晶体 化学计量比 晶体生长 组分 测定 |
| 文章编号： | 1000-985X(2001)02-0129-06 |
| 修稿时间： | 2000年11月12 |
Growth of
Near-stoichiometric LiNbO3 Crystal and Composition Determination |
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| CHEN Xiao-jun,LI Bing,ZHU Deng-song,LI Guan-Gao,CHEN Shao-lin,HUANG Zi-heng,WU Zhong-kang.Growth of
Near-stoichiometric LiNbO3 Crystal and Composition Determination[J].Journal of Synthetic Crystals,2001,30(2):129-134. |
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| Authors: | CHEN Xiao-jun LI Bing ZHU Deng-song LI Guan-Gao CHEN Shao-lin HUANG Zi-heng WU Zhong-kang |
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| Abstract: | 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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