9 January 2014 Design and development of a freeform active mirror for an astronomy application
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The advent of extremely large telescopes will bring unprecedented light-collecting power and spatial resolution, but it will also lead to a significant increase in the size and complexity of focal-plane instruments. The use of freeform mirrors could drastically reduce the number of components in optical systems. Currently, manufacturing issues limit the common use of freeform mirrors at short wavelengths. This article outlines the use of freeform mirrors in astronomical instruments with a description of two efficient freeform optical systems. A new manufacturing method is presented which seeks to overcome the manufacturing issues through hydroforming of thin polished substrates. A specific design of an active array is detailed, which will compensate for residual manufacturing errors, thermoelastic deformation, and gravity-induced errors during observations. The combined hydroformed mirror and the active array comprise the Freeform Active Mirror Experiment, which will produce an accurate, compact, and stable freeform optics dedicated to visible and near-infrared observations.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Zalpha Challita, Zalpha Challita, Tibor Agócs, Tibor Agócs, Emmanuel Hugot, Emmanuel Hugot, Attila Jaskó, Attila Jaskó, Gabby Kroes, Gabby Kroes, William Taylor, William Taylor, Chris Miller, Chris Miller, Hermine Schnetler, Hermine Schnetler, Lars Venema, Lars Venema, László Mosoni, László Mosoni, David Le Mignant, David Le Mignant, Marc Ferrari, Marc Ferrari, Jean-Gabriel Cuby, Jean-Gabriel Cuby, } "Design and development of a freeform active mirror for an astronomy application," Optical Engineering 53(3), 031311 (9 January 2014). https://doi.org/10.1117/1.OE.53.3.031311 . Submission:


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