RT Journal Article
T1 MEGARA anti-reflective coatings: theoretical and observed throughput estimations
A1 Ortiz, R.
A1 Carrasco, E.
A1 Paez, G.
A1 Pompa, O.
A1 Sánchez Blanco, E.
A1 Gil De Paz, Armando
A1 Gallego Maestro, Jesús
A1 Iglesias Paramo, J.
AB MEGARA is the new integral field unit (IFU) and multi-object (MOS) spectrograph successfully commissioned at Gran Telescopio Canarias, in August 2017. MEGARA provides spectral resolutions R (fwhm) similar to 6000, 12000 and 20000, via volume phase holographic gratings, at very high efficiency in both IFU and MOS modes. In the case of MEGARA main optics and pupil elements optics, the surfaces in contact with air have an anti-reflective (AR) coatings to minimize the Fresnel losses at the interface glass-air. In this work we present the designs and calculation of the total throughput of the optical system based in the transmission measurements of the AR coated witness samples. The results reflect the benefits of having implemented customized AR coatings for the mean angle of incidence on each surface as the measured throughput was better than the requirements. We analyze the effects of the pupil elements AR coatings for each spectral configuration.
PB SPIE-Int Soc Optical Engineering
SN 0277-786X
YR 2018
FD 2018
LK https://hdl.handle.net/20.500.14352/18699
UL https://hdl.handle.net/20.500.14352/18699
LA eng
NO © (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only. Conference on Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation (III. 2018. Austin, TX)
DS Docta Complutense
RD 15 abr 2025