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Proceedings Paper

Meaningful options for a dichroic unit within the natural & laser guide star AO systems at the Giant Magellan Telescope
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Paper Abstract

The use of tilted elements in fast convergent beams like a dichroic unit is always a delicate matter in optical design. In adaptive optics (AO) applications this issue proves itself to be more severe with respect to classical imaging or spectroscopy: this due to the fact that the laser is co-moving with the launch telescope system while the natural guide star is co-moving with the sky. Because of the GMT design, during AO operations this condition translates as that the laser guide star moves around the target while the natural guide star does not. In this context, we studied two options for a high-optical quality and an easy to-plug-in dichroic unit dividing lasers beacons (reflected) and natural stars (transmitted). Beyond their different optical performances and mechanical implementations, these options are able both to accomplish the main goal of simultaneous operation of natural and laser-oriented AO at the GMT. One of these two has successfully passed the GMT AO Preliminary Design Review (PDR) on July 2013.

Paper Details

Date Published: 21 July 2014
PDF: 9 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91484X (21 July 2014); doi: 10.1117/12.2054601
Show Author Affiliations
Jacopo Antichi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Enrico Pinna, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Simone Esposito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Marco Bonaglia, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Lorenzo Busoni, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Fernando Santoro, Giant Magellan Telescope Corp. (United States)
Antonin Bouchez, Giant Magellan Telescope Corp. (United States)


Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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