Femtosecond pump and probe experiments on thiophene-based polymers by a hybridly mode-locked cavity dumped dye laser

Results on the bleaching decay observed in low-band gap thiophene-based polymers by femtosecond pump and probe experiments are presented. The laser used for excitation and probe is a newly developed cavity dumped femtosecond dye laser. The excited state kinetics of these materials presents a fast biexponential time behavior that may be related to the formation and decay of self-trapped excitons