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为了缩短单光子探测器工作的死时间,提高单光子计数率,在分析单光子探测器被动抑制工作模式的基础上,针对硅雪崩光电二极管的工作特点,实验设计了精密快速的抑制电路,用以控制探测器的雪崩淬灭和电压恢复,实施了主动淬灭与快恢复相结合的全主动抑制技术。结果表明,该技术使探测器工作在更加安全高效的全主动抑制模式下,最后实验测得探测器总的死时间由原被动抑制模式下大于2μs缩短至120ns,单光子计数率由被动模式下低于1MHz上升到8MHz 以上,从而达到了提高计数率的目的,满足一些单光子高效检测和计数的需要。
In order to shorten the dead time of single-photon detector and improve the single-photon counting rate, based on the analysis of the passive photodetector operation mode, aiming at the working characteristics of silicon avalanche photodiode, a fast and accurate suppression circuit was designed experimentally To control the detector avalanche quenching and voltage recovery, the implementation of active quenching and fast recovery combined with full active suppression technology. The results show that this technique can make the detector work in a safer and more efficient active rejection mode. Finally, the total dead time of the detector is shortened from more than 2μs to 120ns in the original passive mode. The single-photon counting rate is controlled by the passive mode Below 1MHz rose to 8MHz above, so as to achieve the purpose of increasing the count rate, to meet the needs of some single-photon detection and counting of high efficiency.