Mid-infrared Spectrally Pure Single-Photon States Generation from 22 Nonlinear Optical Crystals

Figure 3

(a, b): The GVM angle and the corresponding poling period for QPM crystal OP-ZnSe. The solid black line indicates  = 45, and the dashed black line indicates the degenerate case 2 = . In this figure, the QPM nondegenerate wavelengths’ case is under type-0 phase-matching condition. (a) ZnSe-θ (°). (b) ZnSe-Λ (μm).

(a)

(b)