超短光脉冲波形对门模单光子探测的影响

Influence of Ultra-short Laser Pulse Shapes on Gate-mode Single Photon Detection

采用两种不同的皮秒光脉冲波形进行了门模单光子探测实验.测量了单光子探测效率随探测器和超短脉冲光源之间的同步延迟细微调节时的变化曲线.结果表明:光脉冲波形直接影响光子到达时间与门脉冲时间窗口之间的精确同步和探测效率,使用其中一种脉宽较短的皮秒光脉冲时探测效率比使用另一种脉冲提高了约9%.

Experiments of gated-mode single photon detection are performed using two picosecond laser pulses with different pulse shapes. The variation of single photon detection efficiency versus synchronous delay between detector and ultra-short pulse laser source is measured. The experimental results show that laser pulse shapes directly influence the precise synchronization between the arrival time of photon and the time window of gating pulse and so the detection efficiency. The detection efficiency can be improved about 9% using the shorter one of picosecond laser pulses compared with the other one.