  Optically trapped laser-cooled polar molecules hold promise for new science
and technology in quantum information and quantum simulation. Large numerical
aperture optical access and long trap lifetimes are needed for many studies,
but these requirements are challenging to achieve in a magneto-optical trap
(MOT) vacuum chamber that is connected to a cryogenic buffer gas beam source,
as is the case for all molecule laser cooling experiments so far. Long distance
transport of molecules greatly eases fulfilling these requirements as molecules
are placed into a region separate from the MOT chamber. We realize a fast
transport method for ultracold molecules based on an electronically
focus-tunable lens combined with an optical lattice. The high transport speed
is achieved by the 1D red-detuned optical lattice, which is generated by
interference of a focus-tunable laser beam and a focus-fixed laser beam.
Efficiency of 48(8)% is realized in the transport of ultracold calcium
monofluoride (CaF) molecules over 46 cm distance in 50 ms, with a moderate
heating from 32(2) {\mu}K to 53(4) {\mu}K. Positional stability of the
molecular cloud allows for stable loading of an optical tweezer array with
single molecules.
