Abstract: A lightweight mirror is disclosed in which the core and backsheet of the mirror are constructed from a single piece of glass. The core is lightweighted by drilling or otherwise forming a series of pockets in the core with the machining process proceeding from the front of the core toward the backsheet. A plurality of walls left between each of the adjacent machined-out areas to provide the core with rigidity and to aid in supporting a facesheet on which a reflecting surface is formed. The facesheet is fastened to the rim of the core and to the walls which remain between the adjacent pockets in the core using a frit bonding process.

Abstract: A fast, large aperture, electrically actuated shutter mechanism capable of ithstanding high power densities. The shutter's ability to withstand high power densities is achieved by making the shutter plate highly reflective on one side and providing cooling means on the opposite side.