  Non-Common Path Aberrations (NCPA) are one of the main limitations for
extreme Adaptive Optics (AO) system. NCPA prevent extreme AO systems to achieve
their ultimate performance. These static aberrations are unseen by the wave
front sensor and therefore not corrected in closed loop. We present
experimental results validating new procedures of measurement and
pre-compensation of the NCPA on the AO bench at ONERA. The measurement
procedure is based on new refined algorithms of phase diversity. The
pre-compensation procedure makes use of a pseudo-closed loop scheme to overcome
the AO wavefront sensor model uncertainties. Strehl Ratio obtained in the
images reaches 98.7% @ 632.8 nm. This result allows us to be confident of
achieving the challenging performance required for extrasolar planet direct
observation.
