Manufacturing of primary mirrors from Sitall CO-115M for European projects TTL, NOA, and VST

Details Manufacturing of primary mirrors from Sitall CO-115M for European projects TTL, NOA, and VST Manufacturing of primary mirrors from Sitall CO-115M for European projects TTL, NOA, and VST

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001spie.4451..131a&link_type=abstract

Proc. SPIE Vol. 4451, p. 131-137, Optical Manufacturing and Testing IV, H. Philip Stahl; Ed.

Astronomy and Astrophysics

Astronomy

Scientific paper

JSC LZOS under the contract with Carl Zeiss Jena, Germany produced three 2050 mm (F/3) primary hyperbolic mirrors for TTL project (Telescope Technologies Limited, Great Britain) during 1997-2001. The asphericity is approximately 20 micrometers from the nearest sphere. The telescope field of view is approximately 40 arcmin. 80% encircle energy within less than 0.2 arcsec was achieved from all mirrors. The surface error RMS is less than 9 nm. 2280 mm (F/2.3) primary mirror for NOA project (Astronomical Institute - National Observatory of Athens, Greece) was produced. The asphericity is approximately 40 micrometers . The telescope field of view with corrector is approximately 1.04 degrees. The primary mirror is classical one with 300 mm thickness and mirror diameter to mirror thickness ratio (aspect ratio) of 7.6:1. The primary mirror has 80% encircle energy within less than 0.2 arcsec and surface error RMS less than 9 nm. 2650 mm (F/1.8) primary mirror for VST project (VLT Survey Telescope, Osservatorio Astronomico di Capodimonte Napoli) was produced. The asphericity is approximately 100 micrometers . 1.5 degrees telescope field of view with corrector will be achieved. VST primary adaptive mirror is 140 mm meniscus. The aspect ratio is 19:1.

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