论文和技术资料

We have studied ultrafast all-optical switching devices based on two-photon absorption, which are expected to have ultrafast response less than 1 ps in wideband and to be independent of polarization of light. In our laboratory, we have obtained the analytical solution for the equation of light propagation in our model that the two-photon absorption occurs in a sample. Though we have used the analytical expression to obtain the two-photon absorption coefficient with our experimental data, the assumption in our model has remained uncertain. In this study, we simulated the propagation of Gaussian beam in a semiconductor sample occurring two-photon absorption using COMSOL Multiphysics, and analyzed the simulation results with our expression.