Nonlinear and Linear Optical Properties of Eosin B Dye-AgNO₃-Polyvinylprrolidone Films

Organic molecules such as laser dyes (Eosin B) and PVP polymer have attracted a great attention due to their large nonlinear optical susceptibility and the opportunity of tailoring their properties which allow these materials to be used to protect optical detection elements such as human eyes and optical sensors, by controlling the fluency on the image plane below the preferred level. Films from Eosin B dye-AgNO₃-PVP have been prepared by casting method. Optical properties; (absorbance and transmittance spectra, reflectivity, refraction coefficient and the optical absorption coefficient) of these films have been studied. Also, the nonlinear optical properties; (nonlinear refraction coefficient and nonlinear absorption coefficient) were accounted. This experiment was performed using (CW) Diode laser with a wavelength of 650 nm. The calculated nonlinear refractive index for EB/AgNO₃ 0.004 g/PVP film, n ₂ = 26.7520 × 10^–6 cm²/W and nonlinear absorption coefficient β = 126.97524 cm/W and n ₂ = 7.49779 × 10^–6 cm²/W, β = 335.79386 cm/W for EB/AgNO₃ 0.008 g/PVP film. An optical limiting characteristic of the dye-doped polymer film was studied. The result reveals that Eosin B can be a promising material for optical limiting applications.