Author Affiliations
Abstract
1 Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China
2 School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China
We report an all-fiber telecom-band energy-time entangled biphoton source with all physical elements integrated into a compact cabinet. At a pump power of 800 µW, the photon pairs generation rate reaches 6.9 MHz with the coincidence-to-accidental ratio (CAR) better than 1150. The long-term stability of the biphoton source is characterized by measuring the Hong–Ou–Mandel interference visibility and CAR within a continuous operation period of more than 10 h. Benefiting from the advantages of compact size, light weight, and high stability, this device provides a convenient resource for various field turnkey quantum communication and metrology applications.
energy–time entanglement all-fiber biphoton source Hong–Ou–Mandel interference Chinese Optics Letters
2023, 21(3): 032701
研究了偶氮基(AZO)染料掺杂薄膜MO-PVA和EO-PVA的双光子存储特性。在对薄膜用Ar+激光作预激发下实现了HE-Ne激光的红光存储。获得了实时和短时存储照片。结合光电记录存储曲线，分析了双光子四能级系统的存储机制。实验确定了最佳预激发功率约为0.28 W/cm2，最小He-Ne光可存储功率密度低于0.2 W/cm2。
双光子 AZO染料薄膜 有机材料PVA 存储特性
1 南开大学现代光学研究所, 天津 300071
2 吉林大学物理系, 长春130023
首次用MO-PVA、EO-PVA两种样品.在514 nm波长光激发下，实现了633 nm可擦除光存储，并研究了写入光束对预激发光的依赖关系，用四能级双色光子共振模型对各种实验现象进行了解释。
双色光子 光存储
提出了用双色光子存储来测量寿命的新方法:逐渐延长关闭预激发光与打开写入光束的时间间隔，通过分析衍射信号的变化得到相关能级的寿命。用此方法测得偶氮分子甲基橙和乙基橙的亚稳态寿命分别为4 s和2.7 s。
双色光子 光存储 能级寿命
