10 July 2018 High uniformity IBS coatings for the world’s largest Fabry-Perot etalon of the VTF instrument
Author Affiliations +
Abstract
The first large Fabry-Perot etalon (Ø35 cm) of the VTF instrument was coated successfully using IBS technique. The High Reflective (HR) coatings need to meet the reflectivity specifications (95 +/- 1%) over the entire wavelength range 520-870 nm and the entire aperture (Ø25 cm) and also preserve the plate's flatness and airgap uniformity between the two platesto be better than 3 nm RMS. The change of the figure error of the individual faces after HR coating was exceptionally small: For plate 1 (upper) it changed from 1.7nm RMS before coating to 2.12 nm after coating, no change at all for plate 2 (lower).
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. Pinard, C. Michel, B. Sassolas, J. Teillon, G. Cagnoli, M. Sigwarth, T. Kentischer, W. Schmidt, and B. Reichman "High uniformity IBS coatings for the world’s largest Fabry-Perot etalon of the VTF instrument", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107061R (10 July 2018); doi: 10.1117/12.2312007; https://doi.org/10.1117/12.2312007
PROCEEDINGS
8 PAGES + PRESENTATION

SHARE
Advertisement
Advertisement
Back to Top