Title: A Novel Multi-photon MOT for Efficient Detection of Few Trapped Atoms


Saijun Wu and J. V. Porto

Laser Cooling and Trapping Group, NIST Gaithersburg, MD 20899.


We demonstrate a novel Magneto-Optical Trap (MOT) configuration that explores light pressure forces due to multi-photon transitions. With the standard MOT laser beams propagating along the x- and y- directions, the laser beams along the z-direction are operated at a different wavelength, that couple the excited states of the atom with a third set of levels other than the ground states. Using this scheme we demonstrate efficient capture of cesium atoms in a vapor cell, resulting in a trapped atom sample with typical phase-space density smaller than, but approaching that of a standard MOT at large 2-photon detunings. With laser beams along the z-direction easily filtered away, this novel trap configuration may facilitate back-ground-free collection of trapped atom fluorescence.











Mentors Name: Trey Porto

842, Physics

B141, Building 216, Stop 8424


Email: sjwu77@gmail.com


Is your mentor a Sigma Xi Member?     Yes