Optical figuring and testing of the VLT 8.2-m primary mirrors

Details Optical figuring and testing of the VLT 8.2-m primary mirrors Optical figuring and testing of the VLT 8.2-m primary mirrors

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2536..413b&link_type=abstract

Proc. SPIE Vol. 2536, p. 413-420, Optical Manufacturing and Testing, Victor J. Doherty; H. Philip Stahl; Eds.

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The primary mirrors for the ESO very large telescope project consist of four f/1.8 8.2-m diameter actively supported Zerodur menisci, 175 mm thick. Their optical figuring is under way at REOSC (France) plant. Two mirror blanks have been delivered to the optical manufacturer and the two remaining at the blanks' manufacturer (SCHOOT Mainz, Germany) are due for delivery by the second hald of 1995. Th polishing of the first Zerodur mirror blank is due for completion in the third quarter of 1995. The REOSC optical fabrication and testing methodology will be presented, and the current results will be compared to the specified performance.

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