Second optical harmonic generation in the cadmium mercury telluride heteroepitaxial structures
Second optical harmonic generation (SHG) in mercury cadmium telluride (MCT), heteroepitaxial structures grown up by molecular beam epitaxy on GaAs substrate is experimentally investigated. Dependences of SHG signal on a direction of pumping radiation and polarization and a position of a laser beam on investigated samples both for monocrystal MCT layer and for functional polycrystalline CdTe layer put on it are measured. In the first case the signal is strictly determined by crystallinity and crystallographic orientation of MCT layer and in the second case varies from a point to a point because of CdTe layer polycrystalline structure heterogeneity.