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Optical Engineering • Open Access

Mirror actively deformed and regulated for applications in space: design and performance
Author(s): Marie Laslandes; Emmanuel Hugot; Marc Ferrari; Claire Hourtoule; Celine Lopez; Frederic Chazallet

Paper Abstract

The need for both high quality images and lightweight structures is one of the main drivers in space telescope design. An efficient wavefront control system will become mandatory in future large observatories, retaining performance while relaxing specifications in the global system’s stability. We present the mirror actively deformed and regulated for applications in space project, which aims to demonstrate the applicability of active optics for future space instrumentation. It has led to the development of a 24-actuator, 90-mm-diameter active mirror, able to compensate for large lightweight primary mirror deformations in the telescope’s exit pupil. The correcting system has been designed for expected wavefront errors from 3-m-class lightweight primary mirrors, while also taking into account constraints for space use. Finite element analysis allowed an optimization of the system in order to achieve a precision of correction better than 10 nm rms. A dedicated testbed has been designed to fully characterize the integrated system performance in representative operating conditions. It is composed of: a telescope simulator, an active correction loop, a point spread function imager, and a Fizeau interferometer. All conducted tests demonstrated the correcting mirror performance and has improved this technology maturity to a TRL4.

Paper Details

Date Published: 30 April 2013
PDF: 13 pages
Opt. Eng. 52(9) 091803 doi: 10.1117/1.OE.52.9.091803
Published in: Optical Engineering Volume 52, Issue 9
Show Author Affiliations
Marie Laslandes, Lab. d'Astrophysique de Marseille (France)
Emmanuel Hugot, Lab. d'Astrophysique de Marseille (France)
Marc Ferrari, Lab. d'Astrophysique de Marseille (France)
Claire Hourtoule, Lab. d'Astrophysique de Marseille (France)
Celine Lopez, Société Européenne de Systèmes Optiques (France)
Frederic Chazallet, Shaktiware (France)

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