  We have demonstrated an atom-optical lens, with the advantage of a small
scale and flexible adjustment of the parameters, realized by a far red-detuned
Gaussian laser beam perpendicular to the propagation direction of the cold
atomic cloud. The one-dimensional transverse focusing effect of cold atomic
clouds at the temperature order of 1 $\mu$K freely falling through the
atom-optical lens on the micron scale have been studied theoretically and then
verified experimentally. It is found that theory and experiment are in good
agreement.
