Analysis of linear and nonlinear optical properties of diffraction gratings inscribed on the surface of single crystals of the KTiOPO 4 family

Abstract

We demonstrate here that it is possible to fabricate 1D and 2D diffraction gratings on the (001) surface of RbTiOPO 4 (RTP) and KTiOPO 4 (KTP) single crystals. We analyzed the linear and nonlinear optical properties of 1D and 2D nonlinear photonic crystals. We show enhanced second harmonics when the samples were illuminated with a pulsed Nd:YAG laser, when compared to non-structured surface of the same materials and mainly there exists an asymmetry on the diffraction patterns of the second harmonic generated light, showing higher intensity in diffraction orders different to the zero order in the reflection configuration.