title: Decelerating a pulsed subsonic molecular beam by a quasi-cw traveling optical lattice.
abstract: We propose a promising scheme to realize the deceleration of a pulsed subsonic molecular beam by using a multistage optical Stark decelerator (i.e., a 1D quasi-cw traveling optical lattice), which is composed of two nearly counter-propagating, time-varying, red-detuned light fields with an intensity of ~10⁷Wcm⁻² and a fixed frequency difference between them. We also study the influence of the velocity reduced amount of the traveling lattice, the lattice power, the synchronous phase angle, the deceleration-stage number and the temporal profile of laser pulses on the molecular slowing results by using 3D Monte-Carlo method. Our study shows that the proposed decelerator cannot only be used to slow a pulsed subsonic beam from 240m/s to standstill, but also to obtain a cold molecular packet with a temperature of a few µK, and the corresponding fraction of cold molecules is 10⁻⁶-10⁻⁷, which strongly depends on the synchronous phase angle. And we also find that a pair of appropriate rising and falling times of laser pulses will lead to a better slowing effect than that produced by the top-hat temporal ones.
authors.affiliation: State Key Laboratory of Precise Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Ji
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhou
authors.forename: Zhenxing
authors.initials: Z
authors.lastname: Gu
authors.forename: Jianping
authors.initials: J
authors.lastname: Yin
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*