Observation of coherent transients in ultrashort chirped excitation of an undamped two-level system

Abstract

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.

4 pages, 4 figures, to appear in PRL

References in corpus (1)

• Transform-limited pulses are not optimal for resonant multiphoton transitions

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