  We report on the fabrication and diffraction-limited characterization of
parabolic focusing micromirrors. Sub - micron beam waists are measured for
mirrors with 10 {\mu}m radius aperture and measured fixed focal lengths in the
range from 24 {\mu}m to 36 {\mu}m. Optical characterization of the 3D intensity
in the nearfield produced when the device is illuminated with collimated light
is performed using a modified confocal microscope. Results are compared
directly with angular spectrum simulations, yielding strong agreement between
experiment and theory, and identifying the competition between diffraction and
focusing in the regime probed.
