摘要
Transparent films ofPoly （methylmethacrylate） doped with different concentrations （0, 3 and 4）wt% of Sb203 nanoparticles were prepared using solution cast technique. The transmission and absorption spectra have been recorded in the wavelength range 200-800 nm. Optical constants （absorption coefficient, optical band gap, refractive index and extinction coefficient） of as prepared and after CO2 laser irradiated films have been studied as a function of photon energy. It has been found that the optical parameters of the films were changed significantly after laser treatments. Results show that the energy gaps and the absorption edges shifted to lower energies with the increase in dopant concentration and laser irradiation. The results are interpreted in terms of the change in concentration of localized states.
