Rice University

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Seminar

Physics & Astronomy

Speaker: Luis Marcassa
University of Sao Paulo, Sao Carlos, Brazil

AMO - PHOTOASSOCIATION, VIBRATIONAL COOLING AND TRAPPING OF Rb2 BY A SINGLE HIGH-POWERED LIGHT BEAM

Monday, April 3, 2017

TBA  Brockman Hall for Physics
Rice University
6100 Main St
Houston, Texas, USA

Photoassociation of a pair of ultracold atoms is a quite simple and rapid approach for cold molecule formation. It relies on the absorption of a single photon, mostly at large internuclear distance in a classical view, towards an excited electronic molecular state followed by radiative relaxation down to the electronic ground state. The main limitation of PA is that the latter step is incoherent, so that the population of the created molecules is spread over many vibrational levels with weak or moderate binding energies. If the excited electronic molecular state exhibits a peculiar feature at short internuclear distance like a potential barrier or an avoided crossing, the population of deeply-bound ground state levels may be significantly enhanced. In this work, we use a single high power light beam to photoassociate rubidium molecules in a MOT. The same light beam vibrational cool the molecules, producing v=0 molecules, which can be trapped by the same light beam in a molecular optical dipole trap.

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