Photoinduced non-linear optics diagnostic of the InBr films doped by Al, In and Sn

Abstract

Photoinduced and second-order optical effects in the interfaces separating InBr (IB) films doped by Al, In, Sn and bare glass substrates were investigated using the photoinduced optical second harmonic generation. The second-order optical susceptibilities (at λ=1.76 μm ) show a good correlation with the shift of the absorption edge. The maximal response of the photoinduced response signal was observed for the pump-probe delaying times equal about 32 ps . The measurements indicate that the observed effects are caused by two cases: by interface potential gradients on the border glass-IB and by polarization of the medium due to impurities. The observed phenomenon may be proposed as a sensitive tool for investigations of thin nanointerfaces appearing between the glass substrate and crystallite layers.