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Plano Metallic Mirrors
Plano metallic mirrors are a common optical component used in a wide range of applications such as laser systems, optical instruments, spectral analysis and industrial processing. The core of the process is to coat a plano glass substrate (e.g. B270, D263T, fused silica, etc.) with a metallic reflective coating to achieve high reflectivity.
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What are the characteristics of different metal coating materials?
Metal Coating Type Reflective Band Reflectance@typical value Feature
Al UV 85%@200nm High reflectivity in the UV  band, but easy to oxidize, often with MgF₂ protective coating
VIS 90% @500nm
NIR 92% @1000nm
Ag VIS 95% @500nm Highest reflectivity in visible, but easily vulcanized and blackened, need protective coating (e.g. SiO₂)
MIR 98% @2000nm
Au NIR 98% @1000nm Excellent performance in the infrared, corrosion resistant, but strong absorption in the visible (yellow color)
FIR 99% @10μm
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