Transient Absorption in As2Se3 and Ag(Cu)-Doped As2Se3 Glasses Photoinduced at 1.06 µm

Transient photoinduced absorption in As2Se3 and Ag(Cu)-doped As2Se3 glasses was measured after the samples were excited with an intense laser pulse with a pulse width of 10 ns, a peak optical intensity of ?100 MW/cm2, and a wavelength of 1.064 ?m. The decay time of the nonlinear absorption was within 15?21 ms. A photocurrent experiment was also performed under the same illumination conditions, but we observed no photocurrent. Such a slow nonlinearity is presumably attributed not to free-carrier effects, but to photoinduced effects related to wrong bonds in the glasses.