Metallic mirrors represent a good mixture of performance and value. These broadband coatings are relatively insen- sitive to wavelength, angle of incidence, and polarization. However high-energy levels should be avoided.
Hontec Optics provides metallic high reflective coatings made of Au,Ag,Al,Cr or Ni-Cr. These coatings are applied where a consistent high reflection over a wide spectral range is necessary. Their reflectivity is not higher than dielectrics HR coatings, but their HR spectrum can cover the near-UV,visible and near-IR. In order to prevent these metallic coat- ings from oxidization, these coatings have dielectric overcoat .
Protected Aluminum——For general broadband use, a protected aluminum coating offers the best option. A SiO coating is used to protect the delicate aluminum coating, making it suitable for laboratory and industrial use. This coat- ing gives a reflectivity that most closely matches the reflection of a bare aluminum coating: Ravg>87% @400-1200nm.
UV Enhanced Aluminum and Vis Enhanced Aluminum ——Aluminum coated mirrors are cost effective and offered in a variety of sizes. Bare aluminum is extremely delicate and susceptible to damage. A protective overcoat is layered over the aluminum to make it damage resistant. Our UV Enhanced coating is made by using an overcoat of MgF2 which is transparent in the UV allowing Ravg > 85% from 200nm to 700nm
Protective Silver and Protective Gold also are available upon request! Protected Silver: Ravg>95% @450-12000nm.
Gold is the most efficient reflective coating throughout the entire IR range. Gold coatings provide a surface that may be easily cleaned while providing 98%@2000-12000nm average reflectance throughout the IR region.
