  Collective two-color photoassociation of a freely-interacting 87Rb
Bose-Einstein condensate is theoretically examined, focusing on stimulated
Raman adiabatic passage (STIRAP) from an atomic to a stable molecular
condensate. In particular, Drummond et al. [Phys. Rev. A 65, 063619 (2002);
cond-mat/0110578] have predicted that particle-particle interactions can limit
the efficiency of collective atom-molecule STIRAP, and that optimizing the
laser parameters can partially overcome this limitation. We suggest that the
molecular conversion efficiency can be further improved by treating the initial
condensate density as an optimization parameter.
