Spectroscopic studies of bulk As_2S_3 glasses and amorphous films doped with Dy, Sm and Mn

摘要

The effect of rare earth (Dy and Sm) and transition metal (Mn) luminescent impurities on the optical properties of As_2S_3 glass is studied in a wide spectral region. The Raman, infrared, band-to-band and edge absorption spectroscopies are employed to obtain information about the incorporation of impurity ions in the host glass structure and the corresponding changes in intrinsic optical characteristics. The effects of light-soaking and thermal treatment on the doped As_2S_3 glasses were examined as well. In the fundamental absorption region a reflectivity maximum at 2.98 eV shows blue (Dy, Sm) or red (Mn) shift depending on the electronegativity of the impurity, in accordance with the corresponding variations of the glass structure. Near the edge absorption the impurity affects strongly the slope and the magnitude of the weak absorption tail. The observed effects of metal dopants on the As_2S_3 glass are discussed in connection with the expected behaviour of the impurities in the glass.