论文部分内容阅读
光折变晶体是当前高科技领域,尤其是在国防、航天、通讯等领域中应用广泛的功能材料,可用作全息记录介质、相位共轭反射镜、放大器、光开关等,铌酸锂(LiNbO_3)是其中重要的一类.掺杂可以有效地改善LiNbO_3晶体的光折变性能,如掺镁可提高晶体的抗光损伤能力,掺铁可提高晶体的光折变灵敏度.适当的氧化和还原处理可以改变晶体中掺杂离子的价态和晶体中的缺陷分布,从而影响晶体的光折变性能.我们生长的Fe:LiNbO_3,经过氧化和还原处理后,晶体的光折变性能有较大变化.这里介绍了掺铁铌酸锂的氧化和还原处理工艺条件,研究了处理前后晶体光折变性能的变化,并对这种氧化、还原作用的机理进行了初步探讨.
Photorefractive crystal is currently used in high-tech fields, especially in the fields of national defense, aerospace and communications. It can be used as a holographic recording medium, a phase conjugate mirror, an amplifier, an optical switch, etc. Lithium niobate LiNbO_3) is one of the most important types.Doping can effectively improve the photorefractive properties of LiNbO_3, such as magnesium can improve the light damage resistance of the crystal, iron can improve the photorefractive sensitivity of the crystal.Appropriate oxidation and The reduction treatment can change the valence state of doping ions in the crystal and the distribution of defects in the crystal and thus affect the photorefractive properties of the crystal.Our Fe: LiNbO_3 grown by oxidation and reduction shows better photorefractive properties This paper introduces the oxidation and reduction conditions of iron-doped lithium niobate, and studies the changes of the photorefractive properties of the crystals before and after treatment. The mechanism of this oxidation and reduction is also discussed.