基于Hanbury Brown-Twiss (HBT)实验,我们借助于两个单光子计数模块,一个50/50分束器和一个快速计数卡(FastCom-P7888)研究了不同光场的二阶相干度。我们首先制备了脉冲相干光,连续相干光以及单原子发出的单光子源,并测量这几种不同光场的二阶相干度 g(2)(τ)。我们通过测量俘获在磁光阱(MOT)和远失谐偶极阱(FORT )中的单原子在近共振连续激光激发下所辐射的荧光的二阶相干度,分别得到了 g(2)(τ=0)=0.08和g(2)(τ=0)=0.09,借助于实验中产生的脉冲光与单原子,接下来我们将进行触发式单光子源的实验研究。
We investigated the properties of various light fields based on the Hanbury-Brown-Twiss (HBT) experiment consisted by two single-photon-counting modules (SPCMs) ,one 50/50 beam splitter and the Fast-Com P7888 card .Having experimentally investigated the second-order degree of coherence g2 (τ) for the continuous-wave and the pulse lasers and the single-photon source generated by single atom ,we confirmed the experiment results by theoretical analysis .Specially ,we have achieved a high quality of single-photon source based on single atom trapped in the magnetic-optical trap and the far-off-resonance trap with g(2) (τ=0)=0.09 and g(2) (τ=0)=0.08 ,respectively .Using the pulse laser and the single atom , we can perform the triggered single photon experiment .