掺铁近化学计量比铌酸锂晶体的生长及其光学性能研究  

GROWTH AND OPTICAL PROPERTIES OF NEAR-STOICHIOMETRIC Fe∶LiNbO_3 CRYSTALS

作　　者：周玉祥[1] 郑威[2] 刘彩霞[1] 王锐[1] 

机构地区：[1]哈尔滨工业大学应用化学系,哈尔滨150001 [2]哈尔滨理工大学材料学院,哈尔滨150080

出　　处：《硅酸盐学报》2003年第5期454-457,共4页Journal of The Chinese Ceramic Society

基　　金：国家基础研究 973计划资助项目(G19990 3 3 0);国家高科技发展 863计划资助项目(2 0 0 1AA3 13 0 4)

摘　　要：在LiNbO3(LN)中掺进 0 .0 1%Fe2 O3(质量分数 )和 10 .9%K2 O(摩尔分数 )助熔剂 ,用顶部籽晶 (TSSG)法生长近化学计量比掺铁铌酸锂 (SLN∶Fe) ,以及采用Czochralski法生长同成分掺铁铌酸锂 (CLN∶Fe)。测试了晶体的晶格常数、吸收光谱和红外光谱。Li+取代反位铌(NbLi4 +)和占据锂空位 ,使SLN∶Fe晶体的晶格常数变小。SLN∶Fe晶体的吸收边相对于CLN∶Fe晶体发生了紫移。SLN∶Fe晶体的OH吸收峰移到 3 466cm- 1 。利用二波耦合光路测试了晶体的指数增益系数和响应时间 ,计算了有效载流子浓度。测试结果表明 :SLN∶Fe晶体的指数增益系数达到 2 8cm- 1 ,而CLN∶Fe晶体的指数增益系数为 18cm- 1 ;SLN∶Fe晶体的响应速度比CLN∶Fe晶体提高了 1个数量级。Doping 0.01% Fe 2O 3 (in mass) and 10.9% K 2O (in mole) flux in raw materials of LiNbO 3 crystal, Fe doped near stoichiometric LiNbO 3 (SLN∶Fe) crystal were grown by top seeded solution growth (TSSG) method and Fe doped congruent LiNbO 3(CLN∶Fe) were grown by Czochralski method. The lattice constants, absorption spectra and infrared spectra were measured. Li + ions replace the anti site Nb and occupy the Li vacancy site, which results in the decrease of lattice constants of SLN∶Fe crystals compared with those of CLN∶Fe. The absorption edge of SLN∶Fe shifts to the shorter wavelength compared with that of CLN∶Fe, at 3 466 cm -1 . The exponential gain coefficient and the response time of SLN∶Fe crystal are measured by two wave coupling light. The result indicates that the exponential gain coefficient of SLN∶Fe crystals reaches to 28 cm -1 , while it is 18 cm -1 for CLN∶Fe; and the response time of SLN∶Fe crystal is one order of magnitude higher than that of CLN∶Fe crystal.

关 键 词：近化学计量比 掺铁铌酸锂 晶体生长 光学性能 研究 提拉法 顶部籽晶溶液 

分 类 号：O781[理学—晶体学] O781.5