Abstract

In a recent work, we have developed a robust chainwise atom–molecule adiabatic passage scheme to produce ultracold ground–state molecules via photo-associating free atoms [Phys. Rev. A 81, 013632 (2010) [CrossRef]  ]. With the help of intermediate auxiliary levels, the pump laser intensity requested in the atomic photo-association process can be greatly reduced. In the present work, we extend the scheme to a more generalized $(2n+1)$-level system and investigate its efficiency limitations. As the intermediate levels and auxiliary lasers increase, the atom–molecule adiabatic passage would be gradually closed, leading to a poor transfer efficiency. For the purpose of enhancing the efficiency, we present various optimization approaches to the laser parameters, involving order number $n$, relative strength ratio, and absolute strength. We show that there can remain a limit on the population transfer efficiency given by a three-level $\mathrm{\Lambda }$ system. In addition, we illustrate the importance of selecting an appropriate number of intermediate levels for maintaining a highly efficient transfer under mild experimental conditions.

© 2015 Optical Society of America

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