Nonlinear refraction and optical limiting in solid films of amido black dye under CW laser illumination

摘要

Solid films of the organic dye, Amido Black 10 B was prepared in polyvinyl alcohol host by guest-host method. Refractive nonlin-earity of the solid medium was investigated using single beam z-scan technique under CW laser illumination at 632.8 nm for three dye concentrations. All the samples exhibited a negative (defocusing) nonlinearity and large nonlinear refractive index of the order of 10~(-7) cm~2/W. The optical limiting behavior of the solid film of the dye chromophore is also demonstrated.