  We investigate fluorescence detection using a standing wave of blue-detuned
light of one or more atoms held in a deep, microscopic dipole trap. The
blue-detuned standing wave realizes a Sisyphus laser cooling mechanism so that
an atom can scatter many photons while remaining trapped. When imaging more
than one atom, the blue detuning limits loss due to inelastic light-assisted
collisions. Using this standing wave probe beam, we demonstrate that we can
count from one to the order of 100 atoms in the microtrap with sub-poissonian
precision.
