Square broadband dielectric mirrors on Borofloat 33 substrates provide better than 99% average reflectivity over a spectral range of up to several hundred nanometers and are ideal for device fabricators or OEMs. For more general purpose or prototype development use, square broadband metallic mirrors on Borofloat 33 substrates operate over a very broad spectral range from UV to IR. And for the least expensive – and least demanding – applications, broadband metallic mirrors on float glass substrates are available to be used as front or back surface reflectors.