The MMT7 Mirror: Analysis Of The Rms Difference Specifications And Their Impact On Fabrication And Testing

David S. Anderson; Robert C Crawford

doi:10.1117/12.948080

29 January 1989 The MMT7 Mirror: Analysis Of The Rms Difference Specifications And Their Impact On Fabrication And Testing

David S. Anderson, Robert C Crawford

Author Affiliations +

Proceedings Volume 0966, Advances in Fabrication and Metrology for Optics and Large Optics; (1989) https://doi.org/10.1117/12.948080
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

The figure-quality specifications for the seventh Multiple Mirror Telescope (MMT7) mirror were unusual in that they were defined in terms of rms differences. Recognizing that the atmosphere can be the limiting factor in telescope performance, the specifications for the MMT7 mirror, a 1.8-m, f/2.7 parabola, were derived from analysis of the wavefront irregularities induced by the atmosphere on a nominally perfect planar wavefront from a star. This approach to mirror specifications apparently was first taken with the 4.2-m Herschel Telescope primary mirror, fabricated at Grubb-Parsons.

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David S. Anderson and Robert C Crawford "The MMT7 Mirror: Analysis Of The Rms Difference Specifications And Their Impact On Fabrication And Testing", Proc. SPIE 0966, Advances in Fabrication and Metrology for Optics and Large Optics, (29 January 1989); https://doi.org/10.1117/12.948080

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