Laser cooling with adiabatic transfer on a Raman transition

Author
Abstract
Sawtooth Wave Adiabatic Passage (SWAP) laser cooling was recently demonstrated using a narrow-linewidth single-photon optical transition in atomic strontium and may prove useful for cooling other atoms and molecules. However, many atoms and molecules lack the appropriate narrow optical transition. Here we use such an atom,\&nbsp;<sup>87</sup>Rb, to demonstrate that two-photon Raman transitions with arbitrarily-tunable linewidths can be used to achieve 1D SWAP cooling without significantly populating the intermediate excited state. Unlike SWAP cooling on a narrow transition, Raman SWAP cooling allows for a final 1D temperature well below the Doppler cooling limit (here, 25 times lower); and the effective excited state decay rate can be modified in time, presenting another degree of freedom during the cooling process. We also develop a generic model for Raman Landau-Zener transitions in the presence of small residual free-space scattering for future applications of SWAP cooling in other atoms or molecules.
Year of Publication
2019
Journal
New Journal of Physics
Volume
21
Number of Pages
073045
Date Published
2019-07
URL
https://iopscience.iop.org/article/10.1088/1367-2630/ab2f3c/meta
DOI
10.1088/1367-2630/ab2f3c
JILA PI
Journal Article