Midgap photon effects in As2S3 glass

摘要

Photo-induced phenomena in glasses excited by two-photon absorption have been Studied and compared with those produced by bandgap illumination. The two-photon excitation of As2S3 gives a refractive-index increase. unaccompanied by photodarkening. Raman-scattering spectra show that the excitation increases the density of 'wrong' bonds. These observations are discussed and compared with photo-induced changes in SiO2.