Observation of coherent transients in ultrashort chirped excitation of an undamped two-level system.
The effects of coherent excitation of a two-level system with a linearly chirped pulse are studied theoretically and experimentally [in Rb (5s-5p)] in the low field regime. The coherent transients are measured directly on the excited state population on an ultrashort time scale. A sharp step corresponds to the passage through resonance. It is followed by oscillations resulting from interferences between off-resonant and resonant contributions. We finally show the equivalence between this experiment and Fresnel diffraction by a sharp edge.
Zamith
S
S
Laboratoire de Collisions, Agrégats et Reactivité (CNRS UMR 5589), IRSAMC Université Paul Sabatier, 31062 Toulouse, France.
Degert
J
J
Stock
S
S
de Beauvoir
B
B
Blanchet
V
V
Aziz Bouchene
M
M
Girard
B
B