The mirror coated with metal (Au, Al, or Ag) over coated with silicon monoxide(SiO2). Metallic coatings have low peak reflectance, mechanical durability and damage threshold, but they have extremely broadband and low cost. They are insensitivity to angle of incident light and polarization.
Substrate | Fused silica/ Silica/ BK7 Glass |
Dimension | 2mm~100mm |
Clear aperture | >90% of dimension |
Surface quality | 40/20, 20/10 Scratch-Dig |
Surface Irregularity | λ/2~λ/10 @632.nm |
Thickness | 1mm~20mm |