Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Time-resolved spectroscopy

A 6.2: Hauptvortrag

Montag, 6. März 2017, 17:30–18:00, HS 20

Amplitude and phase control of an atom's optical response — •Alexander Blättermann, Andreas Kaldun, Veit Stooß, Thomas Ding, Christian Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

The optical response of an atom to ultrashort bursts of light gives rise to a characteristic fingerprint of its electronic system - the atomic absorption spectrum. Originating from the superposition of quantum states, we are able to control the optical response by acting on the very same quantum states with an intense laser pulse. Varying the timing and intensity of this laser pulse allows us to modify the amplitude and phase of the optical response anytime during the decay of the excited state. These degrees of freedom enable a variety of experimental schemes, such as a static pulse configuration with tunable intensity up to a dynamic configuration with tunable delay. While the former scheme granted control over the Fano-q parameter of a spectral line [1], the latter recently enabled us to observe the formation of a Fano resonance in time [2]. A third scheme even allows for an in situ characterization of the NIR pulse providing helpful information for data analysis [3]. Our experiments are supported by an analytic model of the laser-controlled dipole moment [4], which establishes a direct link between time and frequency domain.

[1] Science 340, 716 (2013)

[2] Science 354, 738 (2016)

[3] Opt. Lett. 40, 3464 (2015)

[4] J. Phys. B: At. Mol. Opt. Phys. 47, 124008 (2014)