Spectral region for purely refractive third-order nonlinearity in vanadium-oxide phthalocyanine micro-crystals

Summary form only given. We report the study of the resonant third-order nonlinear optical response of vanadium oxide phthalocyanine micro-crystals. The refractive and absorptive contributions to the nonlinear response at several wavelengths across resonance were determined employing the z-scan technique with a tunable picosecond pulsed laser source.