O'Donnell Kevin A, U'Ren Alfred B
División de Física Aplicada, Centro de Investigación Científica yde Educación Superior de Ensenada, Ensenada, Baja California, 22800 Mexico.
Opt Lett. 2007 Apr 1;32(7):817-9. doi: 10.1364/ol.32.000817.
We report spontaneous parametric downconversion having an unusually wide spectral bandwidth. A collinear type 1 phase-matching configuration is employed with degeneracy near the zero group-velocity dispersion frequency. With a spectral width of 1080 nm and degenerate wavelength of 1885 nm, the source also emits a high flux of 3.4 x 10(11) s(-1)W(-1) photon pairs constrained to a cone of only approximately 2 degrees half-angle. A rigorous theoretical approach is developed that confirms the experimental observations. The source properties are consistent with an ultrashort photon-pair correlation time and, for a narrowband pump, extremely high-dimensional spectral entanglement.
我们报道了具有异常宽光谱带宽的自发参量下转换。采用了共线1型相位匹配配置，在零群速度色散频率附近实现简并。该光源的光谱宽度为1080 nm，简并波长为1885 nm，还发射出高通量的3.4×10¹¹ s⁻¹W⁻¹光子对，这些光子对被限制在半角仅约2度的圆锥内。我们开发了一种严格的理论方法，证实了实验观察结果。该光源的特性与超短光子对关联时间一致，并且对于窄带泵浦而言，具有极高维度的光谱纠缠。
