- document
-
Bos, A. (author), Henselmans, R. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), te Voert, M.J.A. (author)The baseline design of the European Extremely Large Telescope features a telescope with a 39-meter-class primary mirror (M1), consisting of 798 hexagonal segments. A measurement machine design is presented based on a non-contact single-point scanning technique, capable of measuring the form error of each segment with nanometer uncertainty, fast,...conference paper 2014
- document
-
Agócs, T. (author), Navarro, R. (author), Venema, L. (author), van Amerongen, A.H. (author), Tol, P.J.J. (author), van Brug, H. (author), Brandl, B.R. (author), Molster, F. (author), Todd, S. (author)We present innovative, immersed grating based optical designs for the SMO (Spectrograph Main Optics) module of the Mid-infrared E-ELT Imager and Spectrograph, METIS. The immersed grating allows a significant reduction of SMO volume compared to conventional echelle grating designs, because the diffraction takes place in high refractive index...conference paper 2014