We present a novel technique of efficient optical pumping of open, high-angular-momentum systems. The method combines two well-established approaches of population manipulation (conventional optical pumping and coherent population transfer), offering the ability to achieve higher population of a sublevel with the highest or lowest quantum number m (the “end state”) than obtainable with either of the techniques. To accomplish this task, we propose to use coherent-population-transfer technique (e.g., adiabatic fast passage) to arrange the system in such a way that spontaneously emitted photon (conventional optical pumping) carries away more entropy than in conventional schemes. This enables reduction of a number of spontaneous decays Nsd required to pump the system with the total angular momentum J from Nsd = J decays in the conventional scheme to Nsd ≲ log2(2J) decays in the proposed scheme. Since each spontaneous-emission event is potentially burdened with a loss of population (population is transferred to a dark state), this enables increasing population accumulated in the “end state”, which is important for many applications.
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Simon Rochester ; Szymon Pustelny ; Konrad Szymański ; Mark Raizen ; Marcis Auzinsh, et al.
Efficient polarization of high-angular-momentum systems
", Proc. SPIE 9763, Slow Light, Fast Light, and Opto-Atomic Precision Metrology IX, 97630D (March 8, 2016); doi:10.1117/12.2220208; http://dx.doi.org/10.1117/12.2220208