The photoinduced change of transmittancy of chalcogenide glasses was investigated under exposure to the laser radiation at 1 .064 and 1 .318 pm. It was established that two-photon absorption in these glasses arises under exposure to radiation with irradiances of 108 W/cm2. It results in irreversible structural transformation of the glasses in the interaction region. This process has threshold character over a narrow range of radiation irradiance (± 0. lIu) and results in appearance of a small-dispersion phase in the bulk glass. Formation of such regions has fluctuating character and causes the appearance of strong light scattering. The effect observed is similar phenomenologically to the known effect of photo-structural transformations in the thin films under exposure to near bandgap light. However, in contrast to the last, the emerged changes of the glass properties are not erased completely by the annealing at the glass transition temperature.
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