Vidal F. Canales, Manuel P. Cagigal Random aberrations on the
pupil of the telescope due to atmospheric turbulence determine
the angular resolution of ground-based telescopes. The
compensation of the wave-front degradation before detection
(adaptive optics) and the extraction of diffraction-limited
information from the image series (speckle interferometry) are
the two techniques able to overcome this limitation. Although
adaptive optics systems with a large number of subapertures in
the wave-front sensor and a large number of actuators in the
deformable mirror provide the best results, they are complicated
and expensive. In contrast, the use of simpler adaptive optics
systems has great potential application. This is the reason why
we will deal with partially compensated adaptive optics systems
(fewer than one actuator per atmospheric coherence diameter) in
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