基于自发参量下转换产生参量荧光的光谱分布特性理论分析

Theoretical analysis of spectral properties of parametric fluorescence via spontaneous parametric down-conversion

采用放大传递函数理论模拟和分析了基于自发参量下转换产生参量荧光的光谱分布特性,结果表明:非简并态下随着相位匹配角的增大,参量荧光空间强度角分布呈现变大趋势,而整个荧光光谱成分的分布逐渐倾向于连续的弱分布状态.对于简并态附近出现荧光光谱具有宽带宽集中分布的特征,采用两种不同的抽运光脉冲进行了对比分析,并且对此特征关于相位匹配角变化的敏感特性,采用放大传递函数和光谱成分概率分布函数两种不同理论的模拟结果一致.

In this paper, we use the amplification transfer function （ATF） to numerically calculate and analyze the spectral properties of parametric fluorescence （PF） via spontaneous parametric down-conversion. The results show that the output angle of singlewavelength PF which is nondegenerate is amplified and the whole spectrum of PF gradually becomes weak and has a continuous distribution. About the dense distribution of the broadband spectrum constituents near the degenerate state, we select two different pump pulses to numerically calculate it. With respect to the sensitive character of the phase-matching angle near the degenerate state, we use ATF and the spectrum probability distribution function （SPDC） to calculate and analysis it individually, the two results are consistent with each other.