  We present a simple and optimal experimental scheme for an all-optical
production of a sodium spinor Bose-Einstein condensate (BEC). With this scheme,
we demonstrate that the number of atoms in a pure BEC can be greatly boosted by
a factor of 5 in a simple setup that includes a single-beam optical trap or a
crossed optical trap. This optimal scheme avoids technical challenges
associated with some all-optical BEC methods, and can be applied to other
optically trappable atomic species. In addition, we find a good agreement
between our theoretical model and data. The upper limit for the efficiency of
evaporative cooling in all-optical BEC approaches is also discussed.
