Atoms and Molecules in Laser and External Fields

Man Mohan

Yuqing Li, Guosheng Feng, Wenliang Liu +4 more

We investigate an effective control of the laser-induced frequency shift of ultracold cesium molecules formed by photoassociation (PA) in a magnetically levitated crossed dipole trap via an external magnetic field. A series of molecular PA spectra have been measured with increasing the PA laser intensity at different bias fields. We find that the slope of laser-induced frequency shift is strongly dependent on the external magnetic field: the slope can be increased up to a maximum of ∼6 times compared with a slope without an external magnetic field. A qualitatively theoretical explanation has been offered by considering the external magnetic field that can be used to manipulate the interaction between ultracold atoms.

André D. Bandrauk

Nikolai L. Manakov, Vitalii D Ovsiannikov, Л. П. Рапопорт

Hirofumi Sakai, C. P. Safvan, Jakob Juul Larsen +3 more

Summary form only given. The use of cw lasers to manipulate the external degrees of freedom of atoms is a central subject of atomic physics. Here, we report experimental evidence that a strong, nonresonant, linearly polarized, laser pulse can align a sample of neutral molecules without causing ionization or dissociation.

Zhao Xiu-Niao, Sun Jian-An, Dou Fu-Quan

By changing the Rabi frequency of the photoassociation laser and the atom-polymer coupling strength, we investigate the effect of external field shape on atom-polymer conversion efficiency. First, by defining time-index, the external filed shape given in literature is improved. We discuss the influence of time-index on conversion efficiency, and then choose a more optimized external filed shape, it has good parameter robustness. Under the action of the external field, the adiabatic process has almost no oscillation, the adiabatic fidelity is close to 1, and the error of the system is less. The ultracold atom-polymer molecules conversion can be realized stably and efficiently.