The Shaping of Free Form Mirrors Without Polishing
A. Preumont1, R. Bastaits1, D. Alaluf1, M. Horodinca2, I. Romanescu2, I. Burda3
1Université Libre de Bruxelles, Brussels, Belgium
2Technical University Gheorghe Asachi, Iasi, Romania
3Babes Bolyai University, Cluj-Napoca, Romania
This study considers the fabrication of bimorph deformable mirrors for Adaptive optics (AO) made of a substrate covered by an array of piezoelectric PZT actuators. A technique for gluing the PZT patches under constant voltage was originally developed to allow to use the AO system with a one-sided voltage range [0-Vmax] with a nominally plane mirror. Gluing PZT patches under uniform voltage leads to a spherical initial shape. Using non-uniform voltage distributions during the gluing process allows to achieve any initial shape which can be reached with the AO system. 'Free form' mirrors offer possibilities for improving the performance of optical systems, but are often difficult to achieve by polishing. The technique proposed in this paper allows to produce AO mirrors with a free form nominal shape. This paper also discusses the 'dimples' (local deformations) associated with the shape of the electrodes acting on the PZT array.
ACTUATOR 2014 Manuscript Poster 45
Publication date: 10/04/2015
Manuscript Poster 45 published in Conference Proceedings ACTUATOR 2014
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