First Surface Mirrors, Protected & Enhanced Aluminum

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Evaporated Metal Films (EMF)

First Surface Mirrors

Protected and enhanced aluminum curve — Protected and Enhanced Aluminum Reflectance Curve 250 – 10,000nm

Front Surface Mirror

A front or first surface mirror provides superior optical quality for engineering and scientific applications. Unlike a standard household mirror, which is coated on the second surface of the glass, a first surface mirror provide an accurate reflection without ghost images. Optical experts recommend first surface mirrors for use in precision optics applications.

Metal coatings are typically very fragile without a protective overcoat. A dielectric coating on a metallic mirror increases the durability of the metal coating as well as provides a barrier to help prevent oxidation. The overcoat has little impact on the performance of the metal coating.

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Protected Aluminum Mirror

Standard Protected Aluminum is our most popular mirror coating for applications in the visible and near-infrared. A layer of Silicon Dioxide (SiO2) is typically used as an overcoat to protect the aluminum layer. This addition to the coating provides an abrasion-resistant surface while maintaining the performance of aluminum mirror. Another option for the overcoat is Magnesium Fluoride (MgF2).

Enhanced Aluminum Mirror

In our Enhanced Aluminum coating, a multi-layer film of dielectrics on top of aluminum is used to increase the reflectance in the visible regions. This coating is ideal for applications requiring increased reflectance from 400 – 650nm. The multi-layer film also provides the same durability characteristics as the protected aluminum coating.

Product SKUs

Optical Coating	Protected Aluminum	Substrate	Soda Lime Float Glass
Size (mm)	76.2 Diameter	Size Tolerance	±0.76
Thickness	6.0	Angle of Incidence	45°
Clear Aperture	90%	Surface Flatness	4 – 6λ
Coating Specification	Ravg >85% @ 400 – 700nm	Wavelength Range	400-700nm
Edges	Cut, 0.5mm Maximum Edge Chip	Surface Quality	80-50
Typical Energy Density Limit	0.3 J/cm2 @ 532nm & 1064nm, 10ns

Optical Coating	Protected Aluminum	Substrate	Soda Lime Float Glass
Size (mm)	81.0 x 100.0	Size Tolerance	±0.76
Thickness	1.0	Angle of Incidence	45°
Clear Aperture	90%	Surface Flatness	4 – 6λ
Coating Specification	Ravg >85% @ 400 – 700nm	Wavelength Range	400-700nm
Edges	Cut, 0.5mm Maximum Edge Chip	Surface Quality	80-50
Typical Energy Density Limit	0.3 J/cm2 @ 532nm & 1064nm, 10ns

Optical Coating	Protected Aluminum	Substrate	Soda Lime Float Glass
Size (mm)	85.0 x 101.0	Size Tolerance	±0.76
Thickness	3.0	Angle of Incidence	45°
Clear Aperture	90%	Surface Flatness	4 – 6λ
Coating Specification	Ravg >85% @ 400 – 700nm	Wavelength Range	400-700nm
Edges	Cut, 0.5mm Maximum Edge Chip	Surface Quality	80-50
Typical Energy Density Limit	0.3 J/cm2 @ 532nm & 1064nm, 10ns

Optical Coating	Protected Aluminum	Substrate	Soda Lime Float Glass
Size (mm)	9 x 9	Size Tolerance	±0.76
Thickness	1.0	Angle of Incidence	45°
Clear Aperture	90%	Surface Flatness	4 – 6λ
Coating Specification	Ravg >85% @ 400 – 700nm	Wavelength Range	400-700nm
Edges	Cut, 0.5mm Maximum Edge Chip	Surface Quality	80-50
Typical Energy Density Limit	0.3 J/cm2 @ 532nm & 1064nm, 10ns

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First Surface Mirrors

Evaporated Metal Films (EMF)