中文摘要：

分析了泵浦光的谱宽以及测量所选用的滤波器的带宽对下转换产生的信号光和闲置光分布范围影响。分别给出当泵浦为单色波和飞秒脉冲时下转换的分布范围和符合宽度范围。并将理论结果与飞秒脉冲泵浦的自发参量下转换（SPDC）实验进行了对比，理论与实验基本吻合。

英文摘要：

We theoretically analyzed the effect of both pump and detection bandwidth to the distribution range of photon pairs generated by SPDC process. The distribution and the coincidence range of the photon pairs are shown in both of CW wave and femto-second pulses used as pump. Finally, the theoretical results are compared with experiments in case of femto-second pulses used as pump.