Quantum interference-enhanced deep sub-Doppler cooling of 39 K atoms in gray molasses

Abstract

We report enhanced sub-Doppler cooling of the bosonic atoms of ${}^{39}$K facilitated by formation of dark states tuned for the Raman resonance in the $\Lambda -$configuration near the D1 transition. Temperature of about 12 $\mu$K is achieved in the two stage D2-D1 molasses and spans a very large parameter region where quantum interference persists robustly. We also present results on enhanced radiation heating with sub-natural linewidth (0.07$\Gamma$) and signature Fano like profile of a coherently driven 3-level atomic system. The Optical Bloch Equations relevant for the three-level atom in bichromatic light field is solved with the method of continued fractions to show that cooling occurs only for a small velocity class of atoms, emphasizing the need for pre-cooling in D2 molasses stage.

7 pages,10 images

References in corpus (4)

• 39-K Bose-Einstein condensate with tunable interactions
• Feshbach resonances in ultracold K(39)
• Λ-enhanced Sub-Doppler Cooling of Lithium Atoms in D1 Gray Molasses
• Sub-Doppler laser cooling of fermionic 40K atoms in three-dimensional gray optical molasses

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