以K_2O作为助熔剂,采用顶部籽晶熔融法生长近化学计量比Mg∶ Fe∶ LiNbO_3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∶ LiNbO_3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∶ LiNbO_3 crystals were grown by top-seeded solution growth method with K_2O 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 LiNbO_3 crystals is between 2% and 3%.
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