  We shape fs optical pulses and deliver them in a single spatial mode to the
input of a multimode fiber. The pulse is shaped in time such that at the output
of the multimode fiber an ultrashort pulse appears at a predefined focus. Our
result shows how to raster scan an ultrashort pulse at the output of a stiff
piece of square-core step-index multimode fiber and in this way the potential
for making a nonlinear fluorescent image of the scene behind the fiber, while
the connection to the multimode fiber can be established via a thin and
flexible single-mode fiber. The experimental results match our numerical
simulation well.
