supported by the National"973"projectof China(No.2012CB933501);the National NaturalScience Foundation of China(Nos.61137003,61025025,61021003);the National"863"Program of China(No.2013AA030501)
We report the dark blue nonlinear Cerenkov radiation by the second harmonic generation (SHG) in a two-layer-stacked hexagonal periodically-poled-MgO: LiNbO3s (PPMgOLNs). Based on the direct wafer bonding of two t...