Physics – Atomic Physics
Scientific paper
2007-09-05
Phys. Rev. A 76, 053419 (2007)
Physics
Atomic Physics
23 pages, 5 figures
Scientific paper
10.1103/PhysRevA.76.053419
We study in detail coherent phase control of femtosecond resonance-mediated (2+1) three-photon absorption and its dependence on the spectral bandwidth of the excitation pulse. The regime is the weak-field regime of third perturbative order. The corresponding interference mechanism involves a group of three-photon excitation pathways that are on resonance with the intermediate state and a group of three-photon excitation pathways that are near resonant with it. The model system of the study is atomic sodium (Na), for which experimental and numerical-theoretical results are obtained. Prominent among the results is our finding that with simple proper pulse shaping an increase in the excitation bandwidth leads to a corresponding increase in the enhancement of the three-photon absorption over the absorption induced by the (unshaped) transform-limited pulse. For example, here, a 40-nm bandwidth leads to an order-of-magnitude enhancement over the transform-limited absorption.
Amitay Zohar
Chuntonov Lev
Gandman Andrey
Rybak Leonid
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