共线SPDC下剩余脉冲泵浦光滤光特性研究

Research on the filtering characteristic of the remaining pulsed pump light after collinear SPDC

从宽带脉冲泵浦光的光谱及滤光片的滤光特性参数出发,分析了自发参量下转换(SPDC)产生纠缠光源的系统中各类滤光片对剩余脉冲泵浦光的滤除效率。分析结果表明,适当组合不同类型的滤光片可以有效地滤除剩余脉冲泵浦光,并从实验上验证了分析结果的正确性。该研究为脉冲泵浦光条件下SPDC过程产生的纠缠光源的有效测量提供了理论指导和实验验证。

Based on the broadband pulsed pump beam spectrum and the filtering characteristic of optical filters, we analyzed the filtering efficiency of the remaining pump light caused by several kinds of filters in the system of generating entangled light source from the spontaneous parametric down-conversion process（SPDC）. It turned out that the filtering efficiency of remaining pump light can be improved greatly by combining different filters properly. We further proved the validity of this analysis through an experiment. This study provides useful theory proved by experiment for future measurement.