Corner cube retroreflectors can be coated with aluminum, protected silver, or various other coatings. They are offered with angle tolerance <5 arcs, transmitted wavefront distortion <0.1 waves, flatness of <0.1 waves, surface quality <10-5 scratch-dig, and surface roughness <5 Å. Better tolerances can be custom-made.
Supply Chain Optics
Irvine, CA