论文部分内容阅读
生长了系列掺杂低铁(质量分数分别为0×10-6,3×10-6,5×10-6,10×10-6,25×10-6,50×10-6、100×10-6)的近化学配比铌酸锂(SLN)晶体,测量了它们的紫外-可见光谱,并通过477nm处的线性吸收系数估算晶体中Fe2+和Fe3+的浓度。利用抽运(365nm)-探测(632.8nm)法测量不同掺杂浓度晶体光致吸收的动态过程和稳态特性,结果表明光致吸收是以扩展指数的形式衰减的,其衰减时间常数(即小极化子的寿命)随掺杂浓度和抽运光强增加而减小,扩展指数因子随抽运光强的增加而减少。根据电子的输运方程,利用四阶龙格-库塔方法对电子输运过程进行数值求解,模拟了掺铁铌酸锂(Fe:SLN)晶体的光致吸收的全过程,与实验所得结果符合得很好。
Growth of a series of doped low iron (mass fraction of 0 × 10-6, 3 × 10-6, 5 × 10-6, 10 × 10-6, 25 × 10-6, 50 × 10-6, 100 × 10-6) near-stoichiometric lithium niobate (SLN) crystals, their UV-Vis spectra were measured and the concentration of Fe2 + and Fe3 + in the crystals was estimated by the linear absorption coefficient at 477 nm. The dynamic process and steady-state properties of photodsorption in different doping concentrations were measured by pumping (365nm) -detection (632.8nm) method. The results showed that photoluminescence was attenuated by an expansive index, and its decay time constant The lifetime of small polaron decreases with the increase of doping concentration and pumping light intensity, and the expansion exponent decreases with the increase of pumping light intensity. According to the electron transport equation, the fourth-order Runge-Kutta method is used to numerically solve the electron transport process to simulate the whole process of photoluminescence of iron-doped niobate (Fe: SLN) crystals. Compared with the experimental results In good agreement.