2-6 September 2013
STIAS Conference Centre
Africa/Johannesburg timezone
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Real-time high speed adaptive optical system for imaging and laser beam control

Presented by Prof. Alexis KUDRYASHOV on 3 Sep 2013 from 18:00 to 18:20
Track: Oral Presentation

Abstract content

In this paper we consider the low-cost high-speed adaptive optical system to be used for a real-time turbulence correction. It consists of standard, high-speed (up to 2 kHz frame rate) Shack-Hartmann wavefront sensor, electronics, software and … stacked actuator deformable mirror. We discuss the advantages and disadvantages of the use of such a correctors compare to standard bimorph mirrors. Also, various algorithms of correction are considered. We suggest to use simple phase conjugation method to obtain the best speed result. Though, for better correction simple hill-climbing approach would be preferable. Timing diagrams of correction are presented and discussed. Important question – how fast should be adaptive system if we want to compensate turbulence changing with the frequency f is considered. As a result – we built the adaptive system that can compensate for real-time aberrations with the closed-loop frequency of 200 Hz. The amplitude of corrected aberrations is in the range of +/- 1.5 μ (local wavefront distortions). Maximum phase aberrations could be compensated are up to 8 μ.


Location: STIAS Conference Centre
Address: Stellenbosch Institute for Advanced Study Wallenberg Research Centre 10 Marais Road Stellenbosch South Africa www.stias.ac.za

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