Nonlinear refractive indices of polystyrene films doped with azobenzene dye Disperse Red 1

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Nonlinear refractive indices of polystyrene films doped with azobenzene dye Disperse Red 1

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Nonlinear refractive indices of polystyrene films containing azobenzene dye Disperse Red 1 (DR1) have been measured as a function of wavelength using the single beam Z-scan technique with a Fourier analysis of the transmittance time evolution. Although the C.W. excitation is carried out far from the absorption resonance region, the large nonlinear optical response has its origin in a thermal effect. We were able to find the thermal diffusivity coefficient of the sample.

Inspec keywords: nonlinear optics; refractive index; Fourier analysis; polymer films

Other keywords: transmittance time evolution; thermal diffusivity coefficient; polystyrene films; Disperse Red 1; Fourier analysis; thermal effect; azobenzene dye; nonlinear refractive indices; single beam Z-scan technique; nonlinear optical response

Subjects: Beam trapping, self focusing, thermal blooming, and related effects; Nonlinear optics and devices

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