The ELT is a project led by the European Southern Observatory (ESO) for a 40-m class optical, near- and mid-infrared, ground-based telescope. When it will enter into operation, the ESO ELT will be the largest and most powerful optical telescope ever built. It will not only offer unrivalled light collecting power, but also exceedingly sharp images, thanks to its ability to compensate for the adverse effect of atmospheric turbulence on image sharpness. The basic optical solution for the ESO ELT is a folded three-mirror anastigmat, using a 39-m segmented primary mirror (M1), a 4-m convex secondary mirror (M2), and a 4-m concave tertiary mirror (M3), all active. Folding is provided by two additional flat mirrors sending the beams to either Nasmyth foci along the elevation axis of the telescope. The folding arrangement (flat M4 and M5 mirrors) is conceived to provide conveniently located flat surfaces for an adaptive shell (M4) and field stabilization (M5). This paper provides an update of the specifications, design, and manufacturing of the ESO ELT optical systems
Marc Cayrel, Philippe Dierickx, Andreas Förster, Frédéric Derie, Liselotte Jochum, Lorenzo Pettazzi, Christian Lucuix, Christoph Haupt, Michael Müller, Elise Vernet, and Jean-François Pirard, "ELT optomechanics: construction status," Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 1070018 (Presented at SPIE Astronomical Telescopes + Instrumentation: June 13, 2018; Published: 6 July 2018); https://doi.org/10.1117/12.2312665.
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