Physics – Optics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1113..134p&link_type=abstract
IN: Reflective optics II; Proceedings of the Meeting, Orlando, FL, Mar. 27-29, 1989 (A90-39027 17-74). Bellingham, WA, Society o
Physics
Optics
Atmospheric Lasers, Low Weight, Optical Radar, Telescopes, Transmitter Receivers, Borosilicate Glass, Cassegrain Optics, Concavity, Low Cost, Structural Design
Scientific paper
It is shown here that significant weight and cost savings can be achieved in telescope design by using several new technologies and keeping only the truly essential imaging requirements. Highly coherent sources permit the use of designs with spherical primary mirrors that satisfy the optical requirements while substantially reducing the optical polishing costs. Such designs use a Mangin secondary mirror with aspheric correction on the concave rear surface, eliminating the need for a large optics to test the usual convex, hyperboloidal secondary. The driving factor in the mechanical design is the primary mirror and the use of a lightweight, borosilicate primary mirror slumped to the net shape of the desired curvature, which will eliminate about 3/4 of the weight of a solid blank and the need to generate the sag prior to polishing. A zenith pointing telescope or beam expander can be achieved which is rugged, high-performance, and with a quarter the mass of a more conventional telescope.
Parks Robert E.
Shao Lian Zhen
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