  We describe the loading of laser-cooled rubidium atoms into a single-mode
hollow-core photonic-crystal fiber. Inside the fiber, the atoms are confined by
a far-detuned optical trap and probed by a weak resonant beam. We describe
different loading methods and compare their trade-offs in terms of
implementation complexity and atom-loading efficiency. The most efficient
procedure results in loading of ~30,000 rubidium atoms, which creates a medium
with optical depth ~180 inside the fiber. Compared to our earlier study this
represents a six-fold increase in maximum achieved optical depth in this
system.
