MEGARA: large pupil element tests and performance

I. Martínez-Delgado; E. Sánchez-Blanco; A. Pérez-Calpena; M. L. García-Vargas; X. M. Maldonado; A. Gil de Paz; E. Carrasco; J. Gallego; J. Iglesias-Páramo; F. M. Sánchez-Moreno

doi:10.1117/12.2233298

22 July 2016 MEGARA: large pupil element tests and performance

I. Martínez-Delgado, E. Sánchez-Blanco, A. Pérez-Calpena, M. L. García-Vargas, X. M. Maldonado, A. Gil de Paz, E. Carrasco, J. Gallego, J. Iglesias-Páramo, F. M. Sánchez-Moreno

Author Affiliations +

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 99124D (2016) https://doi.org/10.1117/12.2233298
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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 arcsec², and a Multi-Object Spectrograph (MOS) with a FOV of 3.5 × 3.5 arcmin². 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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I. Martínez-Delgado, E. Sánchez-Blanco, A. Pérez-Calpena, M. L. García-Vargas, X. M. Maldonado, A. Gil de Paz, E. Carrasco, J. Gallego, J. Iglesias-Páramo, and F. M. Sánchez-Moreno "MEGARA: large pupil element tests and performance", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99124D (22 July 2016); https://doi.org/10.1117/12.2233298

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