22 July 2016 MEGARA: large pupil element tests and performance
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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, I. Martínez-Delgado, E. Sánchez-Blanco, E. Sánchez-Blanco, A. Pérez-Calpena, A. Pérez-Calpena, M. L. García-Vargas, M. L. García-Vargas, X. M. Maldonado, X. M. Maldonado, A. Gil de Paz, A. Gil de Paz, E. Carrasco, E. Carrasco, J. Gallego, J. Gallego, J. Iglesias-Páramo, J. Iglesias-Páramo, F. M. Sánchez-Moreno, 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); doi: 10.1117/12.2233298; https://doi.org/10.1117/12.2233298

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