论文标题
用于表征单光子检测器的宽量范围波长可传输光子源
A wide-range wavelength-tunable photon-pair source for characterizing single-photon detectors
论文作者
论文摘要
通常通过测量其对短脉冲激光源的脉冲响应来获得单光子检测器的时间响应。在这项工作中，我们使用自发参数下转换（SPDC）中产生的时间相关的光子对提出了另一种方法。通过测量用未知和参考光电探测器记录的检测时间之间的互相关，可以提取未知检测器的时间响应函数。更改SPDC过程的临界相匹配条件，提供了光子对波长的源。我们证明了一对的一个光子的连续波长可连续可连接性从526 nm到661 nm，而另一个光子的连续波长可连接性。原则上，该来源可以通过简单地更改基于SPDC的源的泵激光来访问更宽的波长范围。作为初始演示，我们表征了对两个不同的波长带敏感的单光子宣传探测器，一个基于硅，另一个基于Indim艾森尼。
The temporal response of single-photon detectors is usually obtained by measuring their impulse response to short-pulsed laser sources. In this work, we present an alternative approach using time-correlated photon pairs generated in spontaneous parametric down-conversion (SPDC). By measuring the cross-correlation between the detection times recorded with an unknown and a reference photodetector, the temporal response function of the unknown detector can be extracted. Changing the critical phase-matching conditions of the SPDC process provides a wavelength-tunable source of photon pairs. We demonstrate a continuous wavelength-tunability from 526 nm to 661 nm for one photon of the pair, and 1050 nm to 1760 nm for the other photon. The source allows, in principle, to access an even wider wavelength range by simply changing the pump laser of the SPDC-based source. As an initial demonstration, we characterize single photon avalance detectors sensitive to the two distinct wavelength bands, one based on Silicon, the other based on Indim Gallium Arsenide.
