  It is generally believed that the resolution in digital holography is limited
by the size of the captured holographic record. Here, we present a method to
circumvent this limit by self-extrapolating experimental holograms beyond the
area that is actually captured. This is done by first padding the surroundings
of the hologram and then conducting an iterative reconstruction procedure. The
wavefront beyond the experimentally detected area is thus retrieved and the
hologram reconstruction shows enhanced resolution. To demonstrate the power of
this concept, we apply it to simulated as well as experimental holograms.
