New fabrication processes for dimensionally stable beryllium mirrors

Details New fabrication processes for dimensionally stable beryllium mirrors New fabrication processes for dimensionally stable beryllium mirrors

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2775..480p&link_type=abstract

Proc. SPIE Vol. 2775, p. 480-490, Specification, Production, and Testing of Optical Components and Systems, Anthony E. Gee; Jean

Computer Science

Scientific paper

Stability of beryllium mirrors is said to be unpredictable. Three recent mirrors demonstrate excellent stability. JPL produced a plano-concave, 0.5 m solid test mirror that was machined from a HIP'ed billet of special I-70 Be powder, polished bare and tested to 4K. It was thermally stable and had no hysteresis. The JPL ITTT 0.85 m primary mirror used similar material and processes, but with more stress relied treatments. Tests of this bare-polished, very lightweight single arch hyperboloidal mirror to 5K showed similar excellent results. The ESO VLT chopping secondary is a 1.12 m, machined lightweight, nickel plated, convex paraboloid. Similar fabrication processes are being used but with higher strength I-220 Be. In-processes testing indicates a stable mirror. The results show beryllium to be a stable and predictable mirror material.

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