Physics – Optics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1494..481r&link_type=abstract
IN: Space astronomical telescopes and instruments; Proceedings of the Meeting, Orlando, FL, Apr. 1-4, 1991 (A92-45151 19-89). Be
Physics
Optics
1
Aluminum, Mechanical Properties, Metal Surfaces, Mirrors, Telescopes, Figure Of Merit, Thermal Conductivity, Thermal Diffusivity
Scientific paper
Present-day glass mirrors for telescopes, including the most recent results obtained with aluminum mirrors developed within the European EUREKA procedure (LAMA program) are reviewed. The major advantages of the aluminum-alloy solution, which can be extrapolated today for large size, are discussed. It is shown that aluminum-alloy meniscus blanks, polished on a thin nickel coating, are appropriate to manufacture mirrors of astronomical quality. With the technique of electron-beam welding, large sizes can be envisaged. The development of active optics makes it possible to easily compensate for real-time deformations. The good thermal diffusivity of aluminum alloys leads to a better and faster thermal equilibrium than all other glass structures.
Leblanc Jean-M.
Rozelot Jean-Pierre
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