  A novel cesium (Cs) two-color magneto-optical trap (TC-MOT), which partially
employs the optical radiation forces due to photon scattering of the 6P3/2
(F'=5) - 7S1/2 (F"=4) excited-state transition in the Cs 6S1/2 - 6P3/2 - 7S1/2
(852 + 1470 nm) ladder-type system, has been proposed and experimentally
investigated. One of the three pairs of 852 nm cooling/trapping beams (CTBs) in
a conventional Cs MOT is replaced with a pair of the 1470 nm CTBs (type-I) or
with one 852 nm CTB plus another counter-propagating 1470 nm CTB (type-II).
Both the type-I and type-II Cs TC-MOTs can cool and trap atoms on both the red-
and blue-detuning sides of the two-photon resonance. The Cs TC-MOT demonstrated
in this work may have applications in the background-free detection of cooled
and trapped atoms, and the photon-pair sources compatible with the
ensemble-based quantum memory and the long-distance quantum communication via
optical fiber.
