28 July 2008 Developing high-performance reflective coatings for the tunable filter and the high-order interferometer of the 3D-NTT
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Abstract
The following article describes the coatings of both Fabry-Perot (FP) etalons to be installed in the integral field spectrometer 3D-NTT. This simultaneous use of two FP etalons of high and low resolution respectively is the new concept upon which the 3D-NTT is built. Design and fabrication of the coatings of those etalons is a critical step to be able to achieve the desired performances of the instrument. More precisely, these etalons will have to show less than a 10% variation of the finesse from 370 to 900nm and a better than lambda/100 cumulative optical uniformity over a Ø100mm surface. The aim is thus to design high-reflectivity coatings for each of the FP etalon. The design process of the two sets of coatings will be described first, then the expected performances of each etalon will be presented and finally the progresses in the making of these coatings will be discussed.
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Marie-Maude de Denus-Baillargeon, Marie-Maude de Denus-Baillargeon, Laëtitia Abel-Tibérini, Laëtitia Abel-Tibérini, Michel Lequime, Michel Lequime, Claude Carignan, Claude Carignan, Benoît Épinat, Benoît Épinat, Jean-Luc Gach, Jean-Luc Gach, Olivier Hernandez, Olivier Hernandez, Michel Marcelin, Michel Marcelin, } "Developing high-performance reflective coatings for the tunable filter and the high-order interferometer of the 3D-NTT", Proc. SPIE 7013, Optical and Infrared Interferometry, 70133N (28 July 2008); doi: 10.1117/12.789498; https://doi.org/10.1117/12.789498
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