Aluminum First (Front) Surface Mirrors for Precision Optics | Dynasil

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First Surface Mirrors

A 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 provides an accurate reflection without ghost images. Optical experts recommend first surface mirrors for use in precision optics applications.

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

Metal coatings are typically very fragile without a protective overcoat. A dielectric overcoat 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.

Protected Aluminum

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

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.

Round and Square Flat Mirrors available
OEM capabilities – please contact for special pricing
Test samples are available on request

Product SKUs

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

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

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

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

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