Large mirror fabrication of low expansion glasses

Details Large mirror fabrication of low expansion glasses Large mirror fabrication of low expansion glasses

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.160..199s&link_type=abstract

(Group of Optical and Infrared Astronomers in Japan, Astronomical Society of Japan, Inamori Foundation, et al., International Sy

Astronomy and Astrophysics

Astrophysics

1

Glass, Mirrors, Telescopes, Design Analysis, Manufacturing, Mechanical Properties, Silicon Oxides, Thermodynamic Properties

Scientific paper

In the framework of low expansion glasses for use as mirror blank materials, fused silica, Corning Code 7940, and ULE titanium silicate, Code 7971, produced by the flame hydrolysis process, are highly considered due to high purity and homogeneity. The ability of the glasses to fusion-seal offers mirror manufacturing design freedom of shape and size. The fabrication of a large mirror blank such as the 7.5 meter blank for the Japanese National Large Telescope (JNLT) would utilize the hex-seal proven fusion techniques. This technique consists of fusing preselected boules of glass into a monolith to achieve the required thickness and diameter of a mirror blank. The material and fabrication of mirror blanks are major considerations for the success of any telescope.

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