MEGARA anti-reflective coatings: theoretical and observed throughput estimations



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Ortiz, R. and Carrasco, E. and Paez, G. and Pompa, O. and Sánchez Blanco, E. and Gil de Paz, Armando and Gallego Maestro, Jesús and Iglesias Paramo, J. (2018) MEGARA anti-reflective coatings: theoretical and observed throughput estimations. Proceedings of SPIE, 10706 . ISSN 0277-786X

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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.

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© (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)

Uncontrolled Keywords:Antireflection coatings; Optical design; Thin films; Optical testing; Broadband coatings; MEGARA; GTC
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:50836
Deposited On:03 Apr 2019 11:25
Last Modified:03 Apr 2019 11:25

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