Low power continues wave nonlinear optics in red BS dye doped PVA thin film

Effect of laser beam intensity and red BS dye on the nonlinear optical properties of red BS dye doped commercial Polyvinil Alcohol (PVA) film is studied employing different techniques. Nonlinearity measurement was performed using the second harmonic of a continuous Nd-YAG laser beam at 532 nm wavelength and 50 mW power. The nonlinear refractive index and nonlinear absorption coefficient of samples were measured using Z-scan method. Second order nonlinear refractive index of samples was measured to be in the range of 10−5 cm2/W which was increased with increasing the amount of dye in the films structure. Both nonlinear refractive index and absorption coefficient of samples increased with increasing the amount of dye in the structure of the films and laser intensity.