Transient Absorption in As₂Se₃and Ag(Cu)-Doped As₂Se₃Glasses Photoinduced at 1.06 µm

Abstract

Transient photoinduced absorption in As 2 Se 3 and Ag(Cu)-doped As 2 Se 3 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/cm 2 , and a wavelength of 1.064 mm. 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.