Adaptive optics techniques have been developed over the past half century and routinely
used in large ground-based telescopes for more than 30 years. Although this technique has …

For high-contrast imaging systems, the time delay is one of the major limiting factors for the
performance of the extreme adaptive optics (AO) sub-system and, in turn, the final contrast …

Adaptive optics systems are extensively used in astronomy to obtain diffraction-limited
images of celestial objects with ground-based telescopes. The crucial point is to control a …

Perturbations affecting image formation on ground-based telescopes are composed of
signals that are not only generated by the atmosphere. They often include vibrations …

Efficient and optimal prediction of frozen flow turbulence using the complete observation
history of the wavefront sensor is an important issue in adaptive optics for large ground …

Based on the dynamic characteristics of human eye aberration, a microadaptive optics retina
imaging system set is established for real-time wavefront measurement and correction. This …

Current high contrast imaging systems are limited at small angular separations, preventing
the direct imaging of Earth-size exoplanets close to their host stars. One primary cause of …

Mechanical vibrations have a deleterious effect on the performance of high accuracy
astronomical instruments. In particular the future generation of astronomical instruments is …

An H2-optimal control approach for Adaptive Optics has been validated in an on-sky
experiment on a solar telescope. A substantial performance improvement over the integrator …

In an adaptive optics (AO) system, finite time delays contribute a relatively large amount to
the overall wavefront error. The temporal error, due to the time delays, adds to the speckle …