Publication: MEGARA. Large pupil element tests and performance
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Publication Date
2016-07-22
Authors
Martínez-Delgado, I.
Sánchez-Blanco, E.
Pérez-Calpena, A.
García-Vergasa, M.L.
Maldonado, X.M.
Gil de Paz, Armando
Carrasco, E.
Iglesias-Páramo, J.
Sánchez Moreno, F.M.
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SPIE-Int. Soc. Optical Engineering
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Abstract
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.
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© 2016 SPIE. Conference on Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II (2016. Edinburgh/UK).