Abstract

The 0.5 m consortium mirror, which was fabricated as a solid and tested to 100 K¹, has been lightweighted and retested to 20 K. The mirror was machine lightweighted to 80% of a solid with an areal density of 23 kg/m. The light-weighted mirror displayed a distortion pattern reminicent of the raw material processing, the same as seen in the solid. The BRDF was measured at 0.5145 and 3.39 μm to 0.5° and at 10.6 μm to 3°.

© 1990 Optical Society of America