Author/Authors :
Zhang، نويسنده , , Shian and Sun، نويسنده , , Zhenrong and Zhang، نويسنده , , Xiangyun and Xu، نويسنده , , Yu and Wang، نويسنده , , Zugeng and Xu، نويسنده , , Zhizhan and Li، نويسنده , , Ruxin، نويسنده ,
Abstract :
An optimal feedback control of two-photon fluorescence in the Coumarin 515 ethanol solution excited by shaping femtosecond laser pulses based on genetic algorithm is demonstrated experimentally. The two-photon fluorescence intensity can be enhanced by ∼20%. Second harmonic generation frequency-resolved optical gating traces indicate that the optimal laser pulses are positive chirp, which are in favor of the effective population transfer of two-photon transitions. The dependence of the two-photon fluorescence signal on the laser pulse chirp is investigated to validate the theoretical model for the effective population transfer of two-photon transitions. The experimental results appear the potential applications in nonlinear spectroscopy and molecular physics.
