Metalllic mirror coating is appied to the situation where a consistent high reflection on a wide spectral range is needed. Their reflecatance is lower than dielectric high reflection coating. But their spectrum can cover near-UV, visible and near-IR. Dielectric coating is typically applied on the layer of metallic coating to prevent metallic coating from oxidization.
Protected Aluminum Mirror( Ravg>87%@400-1200nm )
Standard protected aluminum is our most popular mirror coating for applications in the visible and near infrared. A λ/2 coating of Silicon Monoxide (SiO) is typically used as an overcoat to protect the delicate aluminum. This treatment provides an abrasion-resistant surface while maintaining the performance of aluminum mirror.
Enhanced Aluminum Mirror( Ravg>93%@400-1200nm )
In an Enhanced Aluminum coating, a multi-layer film of dielectrics on top of aluminum is used to increase the reflectance in the visible or ultraviolet regions. This coating is ideal for applications requiring increased reflectance from 400 – 650nm while the UV and DUV Enhanced Aluminum coatings yield increased reflectance from 120 – 400nm range. The multi-layer film also provides the improved handling characteristics of the protected aluminum coating.
Protected Silver Mirror ( Ravg>95%@450-12000nm )
Silver offers high reflectance in the visible and infrared spectral regions, making it an excellent choice for broadband applications that span multiple spectral regions. A protective coating reduces silver’s tendency to tarnish but the coating still performs best in low humidity environments.
Protected Gold Mirror( Ravg>98%@2000-12000nm )
Gold coatings are effective for applications requiring high reflectance in the NIR and IR regions. Since a durable coating is necessary in many applications, we offer gold with a protective overcoat.
Comparison between different Metallic Mirror reflectance curve
