近化学计量比Mg∶Fe∶LiNbO_3晶体生长及其光学性能  

Growth of Near Stoichiometric Mg∶Fe∶LiNbO_3 Crystals and Their Optical Performance

作　　者：孟凡伟[1] 赵业权[1] 张学锋[1] 

机构地区：[1]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《硅酸盐通报》2009年第6期1230-1234,共5页Bulletin of the Chinese Ceramic Society

摘　　要：以K2O作为助熔剂,采用顶部籽晶熔融法生长近化学计量比Mg∶Fe∶LiNbO3晶体。测试了晶体的紫外-可见吸收光谱、红外光谱、抗光损伤能力以及衍射效率。结果表明:随掺Mg量的增加,近化学计量比Mg∶Fe∶LiNbO3晶体的紫外吸收边先紫移后红移,晶体的衍射效率减小,抗光损伤能力增加。OH-吸收峰出现双峰结构,给出了掺杂离子的占位模型。晶体中[Li]/[Nb]比在49.7～49.8%之间。确定了掺Mg的阈值浓度在2～3%(物质的量百分比,下同)之间。Near stoichiometric Mg∶Fe∶LiNbO3 crystals were grown by top-seeded solution growth method with K2O as fluxing medium.UV-Vis spectra,IR spectra,photodamage resistance ability and diffraction efficiency are measured.The results show that with the increase of doped Mg,the absorption edge of crystals shift to the violet firstly,and then shift to infrared.The photodamage resistance ability increases,but the diffraction efficiency decreases.The OH-absorption peak is bimodal distribution.Location model of doped Mg,Fe ions are given.[Li]/[Nb] ratio in crystals,attributed indirectly,is about 49.7-49.8%,the threshold concentration of Mg in doped near stoichiometric LiNbO3 crystals is between 2% and 3%.

关 键 词：近化学计量比Mg∶Fe∶LiNbO3晶体 顶部籽晶熔融法 光折变性能 

分 类 号：O374[理学—流体力学]