  We experimentally demonstrate the up-conversion of light carrying an image
from the infrared spectrum to the visible spectrum using four-wave mixing via a
ladder-type configuration in an atomic vapor. The results we obtained show the
high correlation between the input image and the up-converted image. We also
discuss the possible influences of experimental parameters on the resolution.
Our work might be useful for research in astrophysics, night-vision technology,
and chemical sensing.
