Robust two-dimensional subrecoil Raman cooling by adiabatic transfer in a tripod atomic system

Abstract

We demonstrate two-dimensional robust Raman cooling in a four-level tripod system, in which velocity-selective population transfer is achieved by a STIRAP pulse. In contrast to basic 2D Raman cooling with square envelope pulses [Phys. Rev. A 83, 023407 (2011)], the technique presented here allows for a wide variation in the pulse duration and amplitude once the adiabaticity criterion is satisfied. An efficient population transfer together with attaining of a narrow spread of the resonant-velocity group leads to the narrowing of the velocity-distribution spread down to $0.1v_{\mathrm{rec}}$, corresponding to an effective temperature equal to $0.01T_{\mathrm{rec}}$. This robust method opens new possibilities for cooling of neutral atoms.

8 pages, 3 figures

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