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.
| Original language | English |
|---|---|
| Pages (from-to) | 346-350 |
| Number of pages | 5 |
| Journal | Chemical Physics Letters |
| Volume | 415 |
| Issue number | 4-6 |
| DOIs | |
| State | Published - 11 Nov 2005 |