双掺铜锰铌酸钾锂晶体的高光折变增益

HIGH PHOTOREFRACTIVE GAIN OF Cu, Mn CO-DOPED POTASSIUM LITHIUM NIOBATE CRYSTAL

在铌酸钾锂(potassium lithium niobate,KLN)中掺入CuO和MnCO3,以提拉法首次生长了Cu:Mn:KLN晶体。用X射线衍射测试并计算了晶体的晶格常数,并以二波耦合实验光路测试了晶体的指数增益系数和响应时间。结果表明:Cu:Mn:KLN晶体的3个晶格常数均比KLN晶体的小;Cu离子和Mn离子在KLN晶体中取代了K+并占据K+位,两种掺杂离子掺入晶体后,减少了晶体的开裂程度。Cu:Mn:KLN晶体的指数增益系数比KLN晶体要提高约2倍,其响应速度比KLN晶体快一个数量级。Cu:Mn:KLN晶体指数增益系数有薄晶片效应,即:晶片厚度变薄时,指数增益系数增加,用光爬行效应对该效应进行了解释。

By doping CuO and MnCO3 into potassium lithium niobate （KLN）, Cu：Mn：KLN crystals were grown by the Czochralski method for the first time. The lattice constants of the crystals were measured and computed by X-ray diffraction. The experimental path of two-wave coupling was used to measure the exponential gain coefficient and response time of the crystals. The results show that the termite lattice constants of Cu：Mn：KLN crystal are all smaller than those of KLN crystal. It is determined that Cu ion and Mn ion in KLN crystal replace K^＋ and then occupy the K^＋ position. After doping Cu and Mn ions into the KLN crystal, the crystal has fewer cracks. Comparing the Cu：Mn：KLN crystal with the KLN crystal, the exponential gain coefficient of the former is double that of the latter and the response speed is also one order of magnitude faster. The exponential gain coefficient of Cu：Mn：KLN crystal has the thin crystal plate effect, i.e. as the crystal plate is thinning, the exponential gain coefficient increases. This effect can be explained by the light crawling effect.