Physics – Optics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3430..317w&link_type=abstract
Proc. SPIE Vol. 3430, p. 317-324, Novel Optical Systems and Large-Aperture Imaging, Kevin D. Bell; Michael K. Powers; Jose M. Sa
Physics
Optics
Scientific paper
Recent developments in the design and fabrication of very light-weight all-composite mirrors have made possible extremely well balanced, thermally stable, structures which distort very little when cooled. One such mirror is the Composite Optics, Incorporated all-composite mirror, M4, which has a 45.7 cm diameter and 3 cm thickness and a spherical surface of radius-of-curvature 2.92 meters. Relative figure measurements of this mirror were made with the Steward Observatory Light Weight Mirror Low Temperature Test Chamber over a temperature range from 20 C to -60 C using a 10.6 micrometer interferometer. The measurements show a remarkably small increase in the rms figure departure from a spherical surface of fixed radius-of-curvature of 0.27 micrometer over the 80 C temperature change. The effective coefficient of thermal expansion over this temperature range derived from the focus change is 0.66 X 10(superscript -6)/C, close to that of fused silica.
Connell Steven J.
Hoffmann William F.
Kasl Eldon P.
Woida Patrick M.
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