  Extensive results from the commissioning phase of PUEO, the adaptive optics
instrument adaptor for the Canada-France-Hawaii telescope, are presented and
discussed. Analyses of more than 750 images recorded with a CCD and a near-IR
camera on 16 nights in wavelengths from B to H are used to derive the
properties of the compensated wavefront and images in a variety of conditions.
The performance characteristics of the system are analyzed and presented in
several ways, in terms of delivered Strehl ratios, full-width-half-maxima, and
quantities describing the improvements of both. A qualitative description is
given of how the properties of the corrected images result from the structure
function of the compensated phase. Under median seeing conditions, PUEO
delivers essentially diffraction-limited images at H and K, images with FWHM
~0.1" at J and I, and provides significant gains down to B, with guide stars as
faint as R = 14. During good conditions, substantial gains were realized with
guide stars as faint as R = 17. A simple user-interface and software which
automatically and continuously optimizes the mode gains during observations
makes the operational efficiency extremely high. A few astronomical examples
are briefly discussed.
