Determination of optical constants and nonlinear optical coefficients of Violet 1-doped polyvinyl alcohol thin film

[摘要] The optical properties of Violet 1-doped polyvinyl alcohol (PVA) have been investigated using Wemble and Didomenico (WD) method. The optical constants such as refractive index 𝑛, the dispersion energy 𝐸𝑑, the oscillation energy 𝐸0, the lattice dielectric constant 𝜀∞, light frequency dielectric constant 𝜀0 and the ratio of carrier concentration to the effective mass 𝑁/𝑚* have been determined using reflection spectra in the wavelength range 300–900 nm. The singlebeam Z-scan technique was used to determine the nonlinear optical properties of Violet 1:polyvinylalcohol (PVA) thin film. The experiments were performed using continuous wave (cw) laser with a wavelength of 635 nm. The calculated nonlinear refractive index of the film, $n_{2} = -2.79 imes 10^{-7}$ cm2/Wand nonlinear absorption coefficient, $eta = 6.31imes10^{−3}$ cm/W. Optical limiting characteristics of the dye-doped polymer film was studied. The result reveals that Violet 1 can be a promising material for optical limiting applications.

[学科分类] 物理（综合）

[关键词] Absorption spectra;nonlinear optics;optical constants;optical limiting.