Fast calibration of high-order adaptive optics systems |
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Authors: | Kasper Markus Fedrigo Enrico Looze Douglas P Bonnet Henri Ivanescu Liviu Oberti Sylvain |
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Affiliation: | European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany. |
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Abstract: | We present a new method of calibrating adaptive optics systems that greatly reduces the required calibration time or, equivalently, improves the signal-to-noise ratio. The method uses an optimized actuation scheme with Hadamard patterns and does not scale with the number of actuators for a given noise level in the wavefront sensor channels. It is therefore highly desirable for high-order systems and/or adaptive secondary systems on a telescope without a Gregorian focal plane. In the latter case, the measurement noise is increased by the effects of the turbulent atmosphere when one is calibrating on a natural guide star. |
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