# Laboratoire Collisions Agrégats Réactivité - UMR5589

Université Paul Sabatier - Bat. 3R1b4 - 118 route de Narbonne 31062 Toulouse Cedex 09, France

## Enhancing the probability of three-photon absorption in iodine through pulse shaping

We demonstrate experimentally that several classes of phase functions are capable of enhancing the amount of three-photon fluorescence from molecular iodine by at least a factor 3 with respect to an unshaped pulse. The investigated functions include third-order Taylor expansions, p-steps and highly structured forms identified by an evolution strategy. The mechanism of the observed control is investigated using wavepacket simulations and found to be due to a time-delay in the second resonance of the excitation ladder.

doi : 10.1088/0953-4075/41/7/074011

Voir en ligne : J. Phys. B : At. Mol. Opt. Phys. 41, 074011 (2008)