Study the Optical Properties of Polyvinyl Alcohol / Methyl Red Composite Irradiated by Violet Laser

The present work investigates optical parameters of Polyvinyl alcohol / Methyl red (PVA/MR) thick films.The work aims to enhance the optical properties of a PVA/MR composite by laser irradiation.The composite has been deposited on a petri dish by casting method with 9000 nm thickness.The PVA/MR thick films were irradiated by a violet laser with wavelength is 405 nm. and 20 mW power for different irradiation intervals (0, 20, 30 and 40) minutes.The optical properties were investigated in the spectral range nm as a function of the irradiating time.The absorption coefficient and the optical bandgap (Eg) increased while refractive index (n) and extinction coefficient (kex) values, dielectric constants ( , ) and the optical conductivity decreased with increasing the laser exposure time.