Multichannel selective femtosecond coherent control based on symmetry properties.
We present and implement a new scheme for extended multichannel selective femtosecond coherent control based on symmetry properties of the excitation channels. Here, an atomic nonresonant two-photon absorption channel is coherently incorporated in a resonance-mediated (2+1) three-photon absorption channel. By proper pulse shaping, utilizing the invariance of the two-photon absorption to specific phase transformations of the pulse, the three-photon absorption is tuned independently over an order-of-magnitude yield range for any possible two-photon absorption yield. Noticeable is a set of "two-photon dark pulses" inducing widely tunable three-photon absorption.
Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, Israel. amitayz@tx.technion.ac.il
Zohar
Z
Amitay
Andrey
A
Gandman
Lev
L
Chuntonov
Leonid
L
Rybak