Newport's Broadband Metallic mirrors are excellent general purpose, broadband reflectors. We offer four standard metallic mirror coatings, covering the UV, visible, and IR. These mirrors are available in round sizes from 12.7 203.2 mm (0.5 8.0 in.) with Borofloat® 33 or Zerodur® substrates. Also available in 12.7, 19.05, 25.4, and 50.8 mm (0.5, 0.75, 1.0, and 2.0 in.) square sizes and two elliptical sizes with Borofloat® substrates. Borofloat has low thermal expansion and is an excellent substrate for most applications. Zerodur is a glass-ceramic material where thermal expansion is nominally zero. This extra stability can be critical for applications requiring diffraction limited performance.Our AL.2 UV enhanced aluminum coating is a durable, broadband UV reflector with average reflectivity greater than 90% from 250 600 nm. The aluminum film is overcoated with UV transparent magnesium fluoride to prevent oxidation of the metal.Our ER.1 enhanced aluminum coating may be used wherever a broadband visible and near infrared reflector is needed. A multilayer dielectric stack deposited over the aluminum film boosts reflectance and improves the durability of the coating. Average reflectivity is greater than 93% from 450 700 nm.Our 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. Average reflectivity is greater than 96% from 480 1100 nm and greater than 98.5% from 1.1 20 µm. This silver mirror is a favorite for Ultrafast scientists who want an inexpensive option. Click here for Autocorrelation Results for Popular Mirrors Used for Ultrafast Applications.Our 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. Average reflectivity is greater than 96% from 650 1700 nm and greater than 98% from 1.7 2.0 µm.