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Cold atom control with an optical one-way barrier

Elizabeth A. Schoene

Published Dec 1, 2010• 1 citation
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Bulletin of the American Physical Society•Mar 16, 2021•0 citations
We present an all-optical one-way barrier for cold rubidium 87 atoms. Along with the basic theory on how the barrier works, we describe the experimental setup and demonstrate an actual realization of the barrier. Such a barrier appears at first glance to violate the second law of thermodynamics; we examine that law and show explicitly that it is not violated for a general class of one-way barriers including our particular realization. As our lab is going to continue on to a different set of experiments requiring very sensitive imaging techniques, we finish with the development and application of a theory for comparing electron-multiplying charge-coupled device (EMCCD) cameras.
Different laser devices working as ``atom diodes'' or ``one-way barriers'' for ultra-cold atoms have been proposed recently. They transmit ground state level atoms coming from one side, say from the left, but reflect them when they come from the other side. We combine a previous model, consisting of the stimulated Raman adiabatic passage (STIRAP) from the ground to an excited state and a state-selective mirror potential, with a localized quenching laser which produces spontaneous decay back to the ground state. This avoids backwards motion, provides more control of the decay process and therefore a more compact and useful device.