Elliptical Mirror, Silver, N-BK7, 25.4 mm x 35.9 mm, λ/10, 480-20,000 nm

The 10E20ER.2 Broadband Silver Elliptical Mirror is an excellent general purpose, broadband reflector. This 25.4 mm (1.0 inch) minor axis, 35.9 mm (1.41 inch) major axis, elliptical mirror is made from a 6.0 mm thick N-BK7 substrate. The ER.2 protected silver coating is composed of a low emissivity silver film fully encapsulated by a multilayer dielectric stack to prevent oxidation. This coating has excellent broadband reflectivity in the IR, while maintaining very good performance in the visible and near IR. The 10E20ER.2 has an average reflectivity greater than 96% from 480 - 1100 nm and greater than 98.5% from 1.1 - 20 µm. This mirror has a λ/10 surface flatness and a 40-20 surface quality.