摘要
By utilizing the extended phase-matching(EPM)method,we investigate the generation of single photons with high spectral-purity in a magnesium-doped periodically-poled lithium niobate(MgO:PPLN)crystal via the spontaneous parametric down-conversion(SPDC)process.By adjusting the temperature and pump wavelength,the wavelength of the single photons can be tuned from telecom to mid-infrared(MIR)wavelengths,for which the spectral-purity can be above 0.95 with high transmission filters.In experiments,we engineer a MgO:PPLN with poling period of 20.35µm which emits the EPM photon pair centered at 1496.6 nm and 1644.0 nm and carry out the joint spectral intensity(JSI)and Glauber’s second-order self-correlation measurements to characterize the spectral purity.The results are in good agreement with the numerical simulations.Our work may provide a valuable approach for the generation of spectrally pure single photons at a wide range of wavelengths which is competent for various photonic quantum technologies.
作者
Chang-Wei Sun
Yu Sun
Jia-Chen Duan
Guang-Tai Xue
Yi-Chen Liu
Liang-Liang Lu
Qun-Yong Zhang
Yan-Xiao Gong
Ping Xu
Shi-Ning Zhu
孙昌伟;孙宇;端家晨;薛广太;刘奕辰;陆亮亮;张群永;龚彦晓;徐平;祝世宁(National Laboratory of Solid State Microstructures and School of Physics,Nanjing University,Nanjing 210093,China;Key Laboratory of Optoelectronic Technology of Jiangsu Province,School of Physical Science and Technology,Nanjing Normal University,Nanjing 210023,China;Faculty of Mathematics and Physics,Huaiyin Institute of Technology,Huaian 223003,China)
基金
supported by the National Basic Research Program of China(Grant Nos.2017YFA0303700 and 2019YFA0308700)
the National Natural Science Foundation of China(Grant Nos.11627810 and 11690031)。
