Abstract
We outline a novel method for estimating a fixed aberration that is in
the image path but not in the wave-front-sensor (WFS) path of an adaptive
optics (AO) imaging system. We accomplish this through a nontraditional application
of the Gonsalves [Proc. SPIE 207, 32 (1997)] least-squares phase-diversity technique, using an ensemble of images
and WFS data. The diversity phases required for this technique are provided
by the temporal differences in WFS residual phase measurements for different
members of the ensemble. We demonstrate the technique by using actual observations
from an operational AO system exhibiting such an aberration. An estimate of
this aberration was obtained by the proposed algorithm that agrees reasonably
well with the observed point-spread function.
© 1997 Optical Society of America
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