LiNbO3和LiTaO3晶体Er3+/Yb3+掺杂水热外延层室温吸收光谱分析

本文引入与浓度和厚度有关的k_NL待定参数, 在J-O理论基础上, 对Er³⁺/Yb³⁺掺杂的LiNbO₃和LiTaO₃单晶衬底上 的多晶水热外延样品进行了基于吸收光谱的拟合计算. LiNbO₃:Ω₂=2.34× 10^-20 cm², Ω₄=0.77× 10^-20 cm², Ω₆=0.31×10^-20 cm², k_NL=4.32× 10^-2 mol·m^-2. LiTaO₃:Ω₂=1.68×10^-20 cm², Ω₄=0.84×10^-20 cm², Ω₆=0.45×10^-20 cm², k_NL=9.17×10^-3 mol· m^-2. 该方法可尝试推广到粉体或胶体等难以直接获得浓度和厚度数据的体系. 经上转换发光测试及光谱参数计分析认为Er³⁺/Yb³⁺离子的掺杂浓度比为1:1的情况下, 样品呈现绿色上转换发光光谱; 可尝试以降低基质声子能量的方法提高⁴I_13/2能级 对²H_11/2和⁴S_3/2能级的量子剪裁效率.

Room temperature absorption spectra analysis of Er3+/Yb3+-doped Hydrothermal Epitaxial Layer on LiNbO3 and LiTaO3 Single Crystal Substrates

In this paper we introduce the undetermined parameter k_NL which is related to the concentration and thickness,and perform the fitting calculation that is on the basis of the absorption spectrum about the hydrothermal epitaxial polycrystalline sample on the surfaces of LiNbO₃ and LiTaO₃ doped with Er³⁺/Yb⁹3+) single crystalline substrates according to the J-0 theory at the room temperature.It is obtained that for LiNbO₃Ω₂ = 2.34×10^-20 cm²,Ω₄ = 0.77×10^-20 cm²,Ω₆ = 0.31×10^-20 cm²,and k_NL = 4.32×10^-2mol·m^-2 and for LiTaO₃Ω₂ = 1.68×10^-20 cm²,Ω₄ = 0.84×10²⁰ cm²,Ω₆ = 0.45×10^-20 cm²,and k_NL = 9.17×10⁽-30 mol·m^-2.This method can be extended to the systems in which the data of concentration and thickness such as powder or colloid are difficult to obtain.According to the up-conversion luminescence analysis and the calculation via spectrum parameters,it is confirmed that both the samples have the green up-conversion luminescence at Er³⁺:Yb³⁺ = 1:1,the method of reducing the energy of matrix phonon is tried to improve the quantum cutting yield of ⁴I_13/2 to ²H_11/2 and ⁴S_3/2.