CAJ | 학술논문

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
니산리정체(LiNbO3)시일충전형적비화학계량비정체，통상소사용적동성분LiNbO3정체중적리니비(［Li］/［Nb］)약위48.6/51.4。아문이용제랍법，종참입11mol%k2O적동성분LiNbO3용체중생장출료고광학질량적근화학계량비LiNbO3단정。여동성분LiNbO3정체상비，기흡수변향단파방향이동；E모(153cm-1)나만보선관종9.4cm-1강저도료7.0cm-1，A1모(876cm-1)나만보선관종25.5cm-1강저도료20.0cm-1；산생532nm～1064nm 2차해파적상필배온도종실온증가도료155.5℃；OH-홍외흡수보선관명현변착，파형야유명현적변화。저사결과표명저충LiNbO3정체중적LiO2함량위49.6mol%，즉［Li］/［Nb］위0.984，접근기화학계량비
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.