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MEGARA. Large pupil element tests and performance



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Martínez-Delgado, I. and Sánchez-Blanco, E. and Pérez-Calpena, A. and García-Vergasa, M.L. and Maldonado, X.M. and Gil de Paz, Armando and Carrasco, E. and Gallego Maestro, Jesús and Iglesias-Páramo, J. and Sánchez Moreno, F.M. and MEGARA, Team (2016) MEGARA. Large pupil element tests and performance. In Advacnes in optical and mechanical technologies for telescopes and instrumentation II. Conference Proceedings, 9912 . SPIE-Int. Soc. Optical Engineering. ISBN 978-1-5106-0203-8

[thumbnail of gildepaz185libre.pdf]

Official URL: http://dx.doi.org/10.1117/12.2233298


MEGARA is a third generation spectrograph for the Spanish 10.4m telescope (GTC) providing two observing modes: a large central Integral Field Unit (IFU), called the Large Compact Bundle (LCB), covering a FOV of 12.5 × 11.3 arcsec^(2) , and a Multi-Object Spectrograph (MOS) with a FOV of 3.5 × 3.5 arcmin^(2) . MEGARA will observe the whole visible range from 3650A to 10000A allowing different spectral resolutions (low, medium and high) with R = 6000, 11000 and 18000 respectively. The dispersive elements are placed at the spectrograph pupil position in the path of the collimated beam and they are composed of a set of volume phase hologram gratings (VPHs) sandwiched between two flat windows and coupled in addition to two prisms in the case of the medium- and high-resolution units. We will describe the tests and setups developed to check the requirements of all units, as well as the obtained performance at laboratory.

Item Type:Book Section
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© 2016 SPIE. Conference on Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II (2016. Edinburgh/UK).

Uncontrolled Keywords:Megara; Integral field unit (IFU); Multi-object spectrograph (MOS); VPH; Gratings; Holographic gratings; GTC
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:62894
Deposited On:30 Oct 2020 11:20
Last Modified:30 Oct 2020 11:20

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