Simplified Sum-Over-States Model Applied to Ultrafast Nonlinear Optical Measurements of Two-Photon Absorbing Chromophores

Abstract

We investigate the nonlinear optical properties of a series of two-photon absorbing chromophores in the femtosecond regime using both two-photon induced fluorescence spectroscopy and the Z-scan technique. We apply a simplified sum-over-states model to the experimental data to predict nonlinear refraction.