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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 3 CONTRIBUTI IN ATTI DI CONVEGNO (Proceedings)
  4. 3.01 Contributi in Atti di convegno
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27993
Title: Si/SiO2-based filter coatings for astronomical applications in the IR spectral range
Authors: Schlegel, R.
Gäbler, D.
Schürmann, M.
Follert, R.
Seemann, U.
OLIVA, Ernesto 
Schwinde, S.
Issue Date: 2018
Volume: Advances in Optical Thin Films VI
Editors: Lequime, Michel; Macleod, H. Angus; Ristau, Detlev
Series: PROCEEDINGS OF SPIE 
Number: 10691
First Page: 106911E
Abstract: Order sorting filters had to be coated for the CRyogenic InfaRed Echelle Spectrograph upgrade (CRIRES+)-instrument, a high-resolution IR spectrograph to be set up at ESO's Very Large Telescope in Chile. Therefore SiO<SUB>2</SUB> was chosen as material with low refractive index. Si and Ge have been investigated as materials with high refractive index, whereby Si has been chosen for the application of the coating. Three types of high-pass filters were deposited with transmission bands starting at 0.96μm, 1.47μm and 2.9μm. These filters need to block effectively all wavelengths between 0.5 μm and the respective band. Therefore, in the blocking range, an optical density above four, or above three for the filter starting at 2.9 μm respectively, had to be achieved. The filter-coatings also needed to survive thermal cycling down to 65K while only introducing a small wave front error. The lower total thickness, compared to coatings consisting of other materials, and the low film-stress are favorable properties for coatings deposited onto prisms and other more complex optical components.
Conference Name: Advances in Optical Thin Films VI
Conference Place: Frankfurt, Germany
Conference Date: 14-17 May, 2018
URI: http://hdl.handle.net/20.500.12386/27993
URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10691/2311310/Si-SiO2-based-filter-coatings-for-astronomical-applications-in-the/10.1117/12.2311310.full
ISSN: 0277-786X
ISBN: 9781510619203
DOI: 10.1117/12.2311310
Bibcode ADS: 2018SPIE10691E..1ES
Fulltext: open
Appears in Collections:3.01 Contributi in Atti di convegno

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