畴工程化周期极化铌酸锂晶体中II型自发参量下转换的特性研究
Characterization of type-II spontaneous parametric down-conversion in domain-engineered PPLN.
作者信息
Kuo Paulina S, Gerrits Thomas, Verma Varun, Nam Sae Woo, Slattery Oliver, Ma Lijun, Tang Xiao
机构信息
Information Technology Laboratory, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, USA 20899-8920.
Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), 325 Broadway, Boulder, CO, USA 80305-3337.
出版信息
Proc SPIE Int Soc Opt Eng. 2016 Mar;9762. doi: 10.1117/12.2218535.
We characterize spontaneous parametric downconversion in a domain-engineered, type-II periodically poled lithium niobate (PPLN) crystal using seeded emission and single-photon techniques. Using continuous-wave (CW) pumping at 775 nm wavelength, the signal and idler are at 1532.5 nm and 1567.5 nm, respectively. The domain-engineered crystal simultaneously phasematches signal and idler pairs: [H(1532.5 nm), V(1567.5 nm)] and [V(1532.5 nm), H(1567.5 nm)]. We observe the tuning curves of these processes through difference-frequency generation and through CW fiber-assisted, single-photon spectroscopy. These measurements indicate good matching in amplitude and bandwidth of the two processes and that the crystal can in principle be used effectively to generate polarization-entangled photon pairs.
我们使用种子发射和单光子技术，对经过畴工程处理的II型周期性极化铌酸锂（PPLN）晶体中的自发参量下转换进行了表征。使用波长为775 nm的连续波（CW）泵浦，信号光和闲频光分别位于1532.5 nm和1567.5 nm处。经过畴工程处理的晶体同时对信号光和闲频光对进行相位匹配：[水平偏振（1532.5 nm），垂直偏振（1567.5 nm）]和[垂直偏振（1532.5 nm），水平偏振（1567.5 nm）]。我们通过差频产生以及连续波光纤辅助单光子光谱法观察了这些过程的调谐曲线。这些测量结果表明这两个过程在幅度和带宽上具有良好的匹配性，并且该晶体原则上可以有效地用于产生偏振纠缠光子对。
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