Gold Mirror Pack, Borofloat, 12.7 mm, λ/10, 650-20,000 nm, Qty 10

This is a 10-pack of the very popular 05D20ER.4 Broadband Gold Mirrors. These mirrors are excellent general purpose, broadband reflectors. The 12.7 mm (1/2 inch) diameter mirrors are made from a 3.1 mm thick Borofloat® 33 substrate which is coated with the ER.4 gold coating. Borofloat® 33 has low thermal expansion and is an excellent substrate for most applications. The ER.4 protected gold coating is ideal for applications requiring broadband reflectance in the near IR to the far IR. A multilayer dielectric overcoat provides protection to the gold from the environment. The 05D20ER.4 has an average reflectivity greater than 96% from 650–1700 nm and greater than 98% from 1.7–20 μm. These mirrors have a λ/10 surface flatness and a 15-5 surface quality.