单光子探测条件下Rb法拉第反常色散滤波器的研究  

Study of Rubidium Faraday Atomic Dispersive Optical Filter with the Single Photon Detector

作　　者：李若虹[1] 孙献平[1] 罗军[1] 曾锡之[1] 詹明生[1] 

机构地区：[1]中国科学院武汉物理与数学研究所波谱与原子分子物理国家开放实验室,湖北武汉430071

出　　处：《中国激光》2004年第8期967-970,共4页Chinese Journal of Lasers

基　　金：国家 973计划 (2 0 0 1CB30 930 0 );中国科学院知识创新工程项目经费 (KGCX2 SW 10 3)资助项目

摘　　要：报道了单光子探测条件下的法拉第反常色散滤波器 (FADOF)滤波特性的实验结果。测量结果表明 ,工作在D2 共振线的Rb原子 780nm法拉第反常色散滤波器的翼谱透射率为 2 8% ,滤光带宽为 0 7GHz ,以及最小可探测激光功率为 0 16 pW/cm2 。由于使用了单光子探测器测量法拉第反常色散滤波器物理参数的方法 ,极大地提高了实验测量的探测灵敏度。通过实验数据分析 ,给出了相关的讨论。在日光情况下 ,如果使用这种 780nmRb法拉第反常色散滤波器代替干涉滤波片 ,将极大地降低背景光噪声和减少误码率 。A 780 nm Rb Faraday atomic dispersive optical filter (FADOF) that operates in the wings of Rb D 2 resonance line is experimentally studied with a single photon detector. The measure result shows that the maximum transmission of the 780nm Rb FADOF is 28% and the full width at half maximum is 0.7 GHz. A minimum detectable laser power of 0.16 pW/cm 2 is obtained with the signal to noise ratio of transmission spectrum of 2. Therefore, the detection sensitivity of Rb FADOF is remarkably increased when a single photon detector is used. If the Rb FADOF is used to replace a interferential optical filter in laser communication, it can lead to a lower bit error ratio and the system that operates with single photon detector is able to work during daytime when optical background is much larger.

关 键 词：光电子学 单光子探测 弱激光 法拉第反常色散 

分 类 号：O436.4[机械工程—光学工程]