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Metallic Mirrors

issue date:2016-3-31 15:35:44 visit frequency:1922

Metallic Mirrors

Metal coated mirrors are mirrors (optical reflectors) based on a thin metal coating, produced with an evaporation or sputtering technique. The metallic coating is placed on a substrate, which is often consisting of a glass, or possibly also of a metal. Common metal coatings consist of aluminum, silver or gold; less common are copper, chrome and various nickel/chrome alloys.

 

Often, the metal layer is covered with a thin layer or multiple layers of a dielectric material such as amorphous SiO2(silica) or Si3N4(silicon nitride),which protects the coating against oxidation(tarnish) and scratches. Such protected coatings are definitely more abrasion-resistant than uncoated ones, but still they tend to be more sensitive than dielectric mirrors. This implies that greater care is required for cleaning of meta-coated optics. Also, metallic mirrors are more or lenss sensitive to humidity and corrosive gases.

 

Multilayer protection coatings can also be used to enhance the reflectivity(see below):



Specifications

Material

N-BK7 ; UV Fused Silica;other optical glass

Dimension Tolerance

±0.0.5mm

Thickness Tolerance

±0.1mm

Surface quality

60/40

Flatness

λ/4@633nm

Parallelism

<3'

Clear Aperture

>90%

Bevel

<0.25mm X 45°

Coating

One surface(S1): Polished and Metallic coating (Al, Ag, Au)

The other surface: Fine ground

Protected Aluminum :Ravg> 85%at400nm-800nm


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