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Proceedings Paper

NPF: mirror development in Chile
Author(s): Sebastián Zúñiga-Fernández; Amelia Bayo; Johan Olofsson; Leslie Pedrero; Claudio Lobos; Elias Rozas; Nicolás Soto; Matthias Schreiber; Pedro Escárate; Christian Romero; Hayk Hakobyan; Jorge Cuadra; Cristopher Rozas; John D. Monnier; Stefan Kraus; Mike J. Ireland; Pedro Mardones
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Paper Abstract

In the era of high-angular resolution astronomical instrumentation, where long and very long baseline interferometers (constituted by many, ∼20 or more, telescopes) are expected to work not only in the millimeter and submillimeter domain, but also at near and mid infrared wavelengths (experiments such as the Planet Formation Imager, PFI, see Monnier et al. 2018 for an update on its design); any promising strategy to alleviate the costs of the individual telescopes involved needs to be explored. In a recent collaboration between engineers, experimental physicists and astronomers in Valparaiso, Chile, we are gaining expertise in the production of light carbon fiber polymer reinforced mirrors. The working principle consists in replicating a glass, or other substrate, mandrel surface with the mirrored adequate curvature, surface characteristics and general shape. Once the carbon fiber base has hardened, previous studies have shown that it can be coated (aluminum) using standard coating processes/techniques designed for glass-based mirrors. The resulting surface quality is highly dependent on the temperature and humidity control among other variables. Current efforts are focused on improving the smoothness of the resulting surfaces to meet near/mid infrared specifications, overcoming, among others, possible deteriorations derived from the replication process. In a second step, at the validation and quality control stage, the mirrors are characterized using simple/traditional tools like spherometers (down to micron precision), but also an optical bench with a Shack-Hartman wavefront sensor. This research line is developed in parallel with a more classical glass-based approach, and in both cases we are prototyping at the small scale of few tens of cms. We here present our progress on these two approaches.

Paper Details

Date Published: 6 July 2018
PDF: 13 pages
Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 107003X (6 July 2018); doi: 10.1117/12.2313983
Show Author Affiliations
Sebastián Zúñiga-Fernández, Univ. de Valparaíso (Chile)
Núcleo Milenio de Formación Planetaria (Chile)
Amelia Bayo, Univ. de Valparaíso (Chile)
Núcleo Milenio de Formación Planetaria (Chile)
Johan Olofsson, Univ. de Valparaíso (Chile)
Núcleo Milenio de Formación Planetaria (Chile)
Leslie Pedrero, Núcleo Milenio de Formación Planetaria (Chile)
Univ. Técnica Federico Santa María (Chile)
Claudio Lobos, Núcleo Milenio de Formación Planetaria (Chile)
Univ. Técnica Federico Santa María (Chile)
Elias Rozas, Univ. Técnica Federico Santa María (Chile)
Nicolás Soto, Núcleo Milenio de Formación Planetaria (Chile)
Univ. Técnica Federico Santa María (Chile)
Matthias Schreiber, Univ. de Valparaíso (Chile)
Núcleo Milenio de Formación Planetaria (Chile)
Pedro Escárate, Large Binocular Telescope Observatory (United States)
Univ. Técnica Federico Santa María (Chile)
Núcleo Milenio de Formación Planetaria (Chile)
Christian Romero, Univ. Técnica Federico Santa María (Chile)
Núcleo Milenio de Formación Planetaria (Chile)
Hayk Hakobyan, Univ. Técnica Federico Santa María (Chile)
Núcleo Milenio de Formación Planetaria (Chile)
Jorge Cuadra, Núcleo Milenio de Formación Planetaria (Chile)
Pontificia Univ. Católica de Chile (Chile)
Cristopher Rozas, Núcleo Milenio de Formación Planetaria (Chile)
Univ. Técnica Federico Santa María (Chile)
John D. Monnier, Univ. of Michigan (United States)
Stefan Kraus, Univ. Austral (Chile)
Mike J. Ireland, The Australian National Univ. (Australia)
Pedro Mardones, Núcleo Milenio de Formación Planetaria (Chile)


Published in SPIE Proceedings Vol. 10700:
Ground-based and Airborne Telescopes VII
Heather K. Marshall; Jason Spyromilio, Editor(s)

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