A conventional adaptive optics (AO) system is widely used to compensate atmospheric
turbulence in free space optical (FSO) communication systems, but wavefront …

A major deficiency of piezoelectric actuators is that their open-loop control accuracy is
seriously limited by hysteresis. In this paper, a novel mathematical model is proposed to …

We present in this paper an analysis of several tip-tilt on-sky data registered on adaptive
optics systems installed on different telescopes (Gemini South, William Herschel Telescope …

An adaptive optics (AO) system is composed of three key elements: a wave-front sensor
(WFS) that detects the aberrations, a deformable mirror (DM) that provides the wavefront …

As we know that deformable-mirror (DM) is used in the adaptive optics (AO) systems to
compensate atmospheric turbulence in free space optical (FSO) communication system. In …

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 …

The objective of this study was to evaluate the performance of the different systems and
techniques aimed at suppressing vibrations on optical ground-based telescopes. We …

Vibrations are detrimental to the performance of modern adaptive optics (AO) systems. In
this paper, we describe new methods tested to mitigate the vibrations encountered in some …

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

We describe a new technique to reduce tip and tilt vibrations via the design of adaptive
optics controllers in a frequency framework. The method synthesizes controllers by …