  We present a table-top coherent diffraction imaging (CDI) experiment based on
high-order harmonics generated at 18 nm by a high average power femtosecond
fiber laser system. The high photon flux, narrow spectral bandwidth and high
degree of spatial coherence allow for ultra-high sub-wavelength resolution
imaging at a high numerical aperture. Our experiments demonstrate a half-pitch
resolution of 13.6 nm, very close to the actual Abbe-limit of 12.4 nm, which is
the highest resolution achieved from any table-top XUV or X-ray microscope. In
addition, 20.5 nm resolution was achieved with only 3 sec of integration time
bringing live diffraction imaging and 3D tomography on the nanoscale one step
closer to reality. The current resolution is solely limited by the wavelength
and the detector size. Thus, table-top nanoscopes with only a few-nm
resolutions are in reach and will find applications in many areas of science
and technology.
