The described method and system allow the simultaneous detection of multicolored samples, e.g. in live cells or tissues, in a simple experimental geometry. It relies on combining ultrashort ultra-broadband laser sources (10) with a fluorescence microscope setup able to collect fluorescence intensities and/or photon arrival times per excitation volume, as well as nonlinear signals, such as second/third-harmonic and sum-frequency generation. In the description, the presented method is referred to as “SyncRGB method”.