We explore laser cooling using light scattering between electronically excited atomic states. In a MOT with the laser beams along z replaced with beams coupling two excited states, we demonstrate efficient 3-D cooling and trapping.
J. (T. ) Porto, S. Wu, R. Brown, and W. P. Phillips, "Multi-Photon Laser Cooling," in Frontiers in Optics 2010/Laser Science XXVI, OSA Technical Digest (CD) (Optical Society of America, 2010), paper STuD3.
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