2013/05/31 by Dipankar Nath, R Kollengode Easwaran, G. Rajalakshmi +1
Physics and Astronomy · #physics.atom-ph #quant-ph
paper · pdf · doi:10.1103/physreva.88.053407
7 pages,10 images
arxiv created 2013/09/04 · arxiv updated 2013/11/11
We report enhanced sub-Doppler cooling of the bosonic atoms of 39K facilitated by formation of dark states tuned for the Raman resonance in the Λ-configuration near the D1 transition. Temperature of about 12 μK 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 (0.07Γ) 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.