锰掺杂近化学计量比铌酸锂晶体的电荷输运过程

用泵浦(350 nm)-探测(780 nm)法研究了轻度锰掺杂近化学计量比铌酸锂晶体的光致吸收的特征,结果表明光致吸收的暗衰减过程以扩展指数的形式衰减,并测量了饱和光致吸收、衰减时间常量和扩展因子对泵浦光光强的依赖关系.在z轴方向上加直流电场测量了紫外光照射下光伏打电流强度和光电导,发现它们与光强之间成超线性关系.实验结果可以用考虑本征缺陷能级和掺杂能级之间激发和复合的修正的双中心电荷输运模型进行定量的解释.     

Temperature-Dependent Sellmeier Equation for 1.0 mol% Mg-Doped Stoichiometric Lithium Tantalate

We propose new coefficients for the Sellmeier equations of 1.0mol% Mg-doped stoichiometric LiTaO3. The extraordinary refractive indices for the wavelength range 0.5-4.0μm and for temperature 30-170℃ are based on measured data derived from quasi-phase-matched （QPM） optical parametric oscillator （OPO） and second- harmonic generation （SHG） based on periodically poled Mg-doped stoichiometric LiTaO3 with a pump wavelength of 1064nm. The corrected refractive indices are in good agreement with our experimental data obtained from QPM OPO and SHG pumped at 1064 μm at different temperatures.