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Q: Fachverband Quantenoptik und Photonik

Q 51: Poster Ultrakalte Moleküle

Q 51.3: Poster

Donnerstag, 13. März 2008, 16:30–19:00, Poster C2

Formation of Ultracold Ground State Molecules with a Single Short Laser Pulse — •Ruzin Aĝanoĝlu and Christiane P. Koch — Freie Universität zu Berlin, Institut für Theoretische Physik, Arnimallee 14, 14195 Berlin

Bringing ultracold systems and coherent control schemes together is a promising subject of current research. One method to combine ultracold and ultrafast is photoassociation where two colliding atoms are transferred to an electronically excited state coherently with a short laser pulse. Already after a single pulse, formation of ultracold molecules in their electronic ground state is also observed. This is due to the change of the initial scattering wavefunction which leads to molecules in very weakly bound levels of the electronic ground state.

Here we study the creation of ground state molecules with a single short laser pulse. Since the molecule formation is desired only in the electronic ground state, an excited state is chosen with a repulsive potential and the short laser pulse is blue detuned for excitation.The laser parameters can be chosen such that atoms far from each other are blown away while atoms very close to each other are kept and form molecules.

The initial thermal probability density of atoms is expected to be very small at short internuclear distances. However, it can be manipulated by changing the scattering properties of the atoms. In this work an optically induced Feshbach resonance is employed to modify the initial atomic distribution prior to photoassociation by a single short pulse.