Spincasting Of A 3.5-m Diameter f/1.75 Mirror Blank In Borosilicate Glass

L W Goble; J . R.P Angel; J. M Hill; E J. Mannery

doi:10.1117/12.948076

29 January 1989 Spincasting Of A 3.5-m Diameter f/1.75 Mirror Blank In Borosilicate Glass

L W Goble, J . R.P Angel, J. M Hill, E J. Mannery

Proceedings Volume 0966, Advances in Fabrication and Metrology for Optics and Large Optics; (1989) https://doi.org/10.1117/12.948076
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

A 3.5-meter-diameter telescope primary-mirror blank was cast from E6 borosilicate glass at the University of Arizona, Steward Observatory Mirror Lab. A light-weighted-hollow design was made with a faceplate and backplate separated by a middle volule of ribs in a honeycomb pattern. The curvature of the F/1.75-mirror face was formed by spinning the melted glass at 8.54 RPM. A telescope on Apache Point in New Mexico will use this mirror.

Citation Download Citation

L W Goble, J . R.P Angel, J. M Hill, and E J. Mannery "Spincasting Of A 3.5-m Diameter f/1.75 Mirror Blank In Borosilicate Glass", Proc. SPIE 0966, Advances in Fabrication and Metrology for Optics and Large Optics, (29 January 1989); https://doi.org/10.1117/12.948076

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