Wavelength variable generation and detection of photon pairs in visible and mid-infrared regions via spontaneous parametric downconversion
Wavelength variable generation and detection of photon pairs in visible and mid-infrared regions via spontaneous parametric downconversion
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DOI：
10.1364/josab.425550
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发表时间：
2021-05
影响因子：
1.9
通讯作者：
Masaya Arahata;Y. Mukai;Bo Cao;T. Tashima;R. Okamoto;S. Takeuchi
中科院分区：
文献类型：
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作者：
Masaya Arahata;Y. Mukai;Bo Cao;T. Tashima;R. Okamoto;S. Takeuchi
我们报告了一个波长可变的实验演示，并通过自发参数下转换在2-5µm的宽光谱范围内检测可见光和中红外（MIR）区域的光子对。尽管最近对这种光子对源的兴趣有所增加，但由于缺乏合适的单光子探测器，对通过低增益下转换过程产生的发射光子的详细评估很少。通过改变非线性晶体的角度，不断调整相位匹配条件，产生波长为600 ~ 965 nm的信号光子和波长为1186 ~ 4694 nm的空闲光子对。我们利用波长为2µm的超导纳米线单光子探测器，使用单光子计数和巧合计数来评估产生的光子对，并使用具有锁定探测系统的InSb探测器检测波长为5µm的光子强度。由此分析，一对生成率为${10^5}\；{{\rm s}^{- 1}}$每兆瓦的泵浦功率是在这个波长范围内实验得到的。这项工作为MIR区域量子技术在MIR单光子源、红外成像和红外光谱等应用的实现提供了基础。
We report an experimental demonstration of wavelength variable generation and detection of photon pairs in the visible and mid-infrared (MIR) regions over a wide spectral range of 2–5 µm via spontaneous parametric downconversion. Despite the recent increase in interest in such a photon-pair source, there have been few detailed evaluations of emitted photons generated via the downconversion process in the low gain regime, due to the lack of suitable single-photon detectors. By changing the angle of the nonlinear crystal, we continuously tune the phase-matching condition and generate photon pairs as signal photons in the wavelength range of 600–965 nm and idler photons in the wavelength range of 1186–4694 nm. We evaluate the generated photon pairs using single and coincidence counts by superconducting nanowire single-photon detectors up to a wavelength of 2 µm and detect the intensity using an InSb detector with a lock-in detection system up to 5 µm. From this analysis, a pair generation rate of ${10^5}\;{{\rm s}^{- 1}}$ per mW of pump power is experimentally obtained for this wavelength range. This work provides a basis for the realization of applications such as heralded MIR single-photon sources, infrared imaging, and infrared spectroscopy based on quantum technologies in the MIR region.