铜铁双掺近化学计量比铌酸锂晶体生长及其光折变性能研究

Study on growth and photorefractive of near-stoichiometric LiNbO_3 crystal of double-doped with Cu and Fe

采用优化工艺参数,在掺有6(mol)%K2O助溶剂熔体中,利用提拉法生长出系列铜、铁双掺近化学计量比LiNbO3晶体。通过二波耦合和透射光斑畸变法测试可知,在未掺和掺铁量不变情况下,随着掺铜量的增加,衍射效率逐渐增大且铜铁双掺铌酸锂晶体衍射效率要高于单掺铜铌酸锂晶体。而其写入时间和擦除时间逐渐减小;抗光损伤能力随着掺铜量的增加逐渐增强,且单掺铜铌酸锂晶体抗光损伤能力远远大于铜铁双掺铌酸锂晶体。

A series of near-stoichiometric LiNbO3 crystal of double doped with Cu and Fe were grew by czochralski method from congruent LiNbO3 batch added with 6% （in mole）K2O through using the best technical parameters. Through the two-wave coupling and transmission distortion facular experiments, we can see that in the without doped Fe or doped Fe case, with the doped copper increases, the diffraction efficiency is gradually increas- ing and copper-iron double- doped lithium niobate crystal diffraction efficiency are higher than a single copper- doped crystal, and the write time and erase time decreases; photo-damage resistance of copper doped increased gradually, and the single copper-doped lithium niobate crystal photo-damage resistance is much larger than the crystal of double-doped Cu and Fe.