Deceleration of polar molecules by synchronous stimulated radiation force with low power light

We propose a theoretical approach for rapid deceleration over short distance on polar molecules by using stimulated force combined with a phase compensation and frequency chirping. First, we simulate the dynamic processes of the decelerated magnesium fluoride (MgF) and ytterbium fluoride (YbF) molecules using the 3D Monte-Carlo method, and find that a buffer-gas-cooled molecular beam with a longitudinal velocity of 200 m/s can be decelerated to be below 5 m/s at a laser power of only 0.44 W for MgF and 0.21 W for YbF per traveling wave. Second, we estimate the number of molecules loaded into the magneto-optical trap (MOT). This scheme overcomes the spatial inhomogeneity of stimulated radiation force and reduces the high laser power requirement, which have not been reported before. Such new results will provide a timely useful way for optical slowing and loading the dense molecule species into a MOT for realization of quantum degeneracy.