Development of an ultra-thin active mirror based on carbon fiber composite

Abstract

Aiming at the application requirements of large synthetic aperture for light-weighted mirrors, a kind of ultra-thin active mirrors based on carbon fiber composites proposed. The structure of the mirror is a four-layer laminated structure, and the total thickness is only about 3mm.Using parallel actuation scheme, it has the advantages of low weight, rapid manufacturing, low cost, and smart surface adjustment ability. The design, numeral calculation, manufacture and surface correction test of this kind active mirror discussed in this article. A Φ85mm aperture, 19-channel active mirror prototype developed, and surface correction test shows that the surface accuracy RMS can be corrected from 1.4 λ to 0.15λ, about 10 times improved.