Gabler, T.T.GablerWaldhäusl, R.R.WaldhäuslBräuer, A.A.BräuerHörhold, H.-H.H.-H.HörholdBartuch, U.U.Bartuch2022-03-032022-03-031997https://publica.fraunhofer.de/handle/publica/19130110.1063/1.118462In a polyconjugated main chain polymer strip waveguide the nonlinear, nonresonant refractive index n2 was measured by monitoring the signal spectrum broadening due to self-phase modulation. The two photon absorption coefficient alpha 2 was obtained by calibrating the inverse transmission measurement. The nonlinear coefficients were determined to be n2=0.85*10-14 cm-2/W and alpha 2=0.08 cm/GW at a wavelength lambda =885.6 nm. The used polymer was poly[1,4-phenylene-1,2-di(phenoxyphenyl)vinylene]. The result is in good agreement with interferometer measurements. The material is suitable for all-optical switching.enabsorption coefficientnonlinear opticsoptical phase conjugationoptical polymeroptical waveguidesrefractive indexspectral line broadeningtwo-photon spectra620621journal article