Abstract
A novel tri-branched copolymer is synthesized to show strongtwo-photon absorption and intense two-photon absorption inducedfluorescence emission under the excitation of the femtosecond laserpulses at wavelength of 800 nm. The dynamics of the excited state wasmeasured by the pump–probe technique. In a one-colour pump–probeexperiment at 800 nm, there was an ultrafast transient absorption,followed by other two relaxation processes. The two-photon absorptionprocess could be one origin for this ultrafast photoabsorption signal,which was further proven by two-colour pump–probe experiments. Theother two decaying processes in the transient absorption dynamics have lifetime of about 15 ps and 129 ps, which reflect the intrabandvibrational relaxation and the decay of two-photon excited state,respectively.
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