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Protected Aluminum Mirrors

AL-front surface mirror for ultraviolet light

SEA-UV Series

Special Properties

  • High-reflection optics for ultraviolet wavelengths
  • Broadband reflectivity from about 250 nm to 10 µm
  • Excellent optical characteristics
  • Metallic aluminum thin-film coating
  • High-quality glass substrate material
  • Aluminum coating protected by a thin quartz layer

Typical Applications

  • Ultraviolet mirrors
  • Mirrors for ultraviolet laser applications
  • UV-VIS-IR mirrors
  • Mirrors for medical applications
  • Mirror optics for UV-curing systems
  • Alternative for silver or gold mirrors
  • UV-sensor technology
  • Broadband laser optics
  • UV mirrors for disinfection systems

Related mirror types

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48h-Express Service 48-hour express service

Our SEA-UV-protected aluminum front surface mirrors provide high reflection in the ultraviolet wavelength range. They are based on an aluminum metal coating covered by a thin SiO2 (quartz) layer.

Unprotected bare-aluminum metal coatings quickly oxidize when exposed to oxygen. Furthermore, such optics are very sensitive to scratching. Therefore, we deposit a thin quartz layer above the aluminum coating to prevent oxidization and make the mirrors more scratch-resistant and durable. Compared to soft and sensitive bare-aluminum metal mirrors, our protected aluminum mirrors' surface is more rigid and resistant to scratching.

Still, protected aluminum mirror coatings are more delicate and susceptible to scratching than our SEA-VIS enhanced aluminum mirrors, which can have a significantly thicker protection layer system because they don't need to reflect in the UV range. So, in general, you should not use protected aluminum mirrors in applications with harsh environments or when exposed to mechanical abrasion.

Because of the metallic layer, the reflection of our SEA-UV mirror coatings is far less angle-dependent than that of dielectric coatings. Moreover, the optics feature a high and broadband optical reflectivity for the ultraviolet to infrared wavelength range. Only close to around 700-870 nm, there is a moderate reflection drop down to slightly below 80%. Above this wavelength spectrum, the reflectivity of the mirror stays continuously high, up to 10 µm. The SEA-UV-protected aluminum mirrors can also work as laser mirror optics for multiple wavelengths at limited laser power simultaneously. In some applications, the SEA-UV mirrors can replace gold or silver mirrors.

We can modify and increase the reflectivity of the coatings for a specific wavelength or a particular optical reflection range by adding thin dielectric layers. Please consider using our custom coating request form to conveniently request a quotation for mirror optics based on your specific requirements. Please contact us if you need additional information or technical support.

To quickly receive a quote for our SEA-UV-protected aluminum front surface mirrors with custom dimensions, please click the button below or select a thickness from the table in the specifications:

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SEA-UV Reflectance
SEA-UV protected aluminum mirror reflectance curve
Enlarge the reflectance curve to show details

Standard Thicknesses

Please click on a glass thickness to request a quote.

Thickness (mm)


48h-Express Service
1.00 ±0.10
2.00 ±0.20
SEA-UV with custom thickness.
The thicknesses marked with "" are also available within 48–hour express service.

Optical Reflection (45° incidence angle)

  • Ravg > 85% at 280–700 nm
  • Rabs >/= 90% at 300–400 nm

Coating construction

  • Metallic mirror coating
  • Aluminum, protected by a SiO2 (Quartz) coating layer

Substrate Material


Surface Quality

  • Typ. 80-50 scratch & dig (MIL-0-13830A)
  • Other on request


  • Adherence according to MIL-C-675 C (tape test)
  • Abrasion-resistant according to MIL-M-13508 C

If you need mirror optics solely for the visible wavelength range, please look at our SEA-VIS-enhanced aluminum front surface mirror, which is optimized for higher VIS reflection thanks to dielectric overcoatings. Moreover, please take a look at our SHP-silver metal mirrors. For the near-infrared wavelength spectrum, we created our SEA-NIR mirrors.

All given details and specifications are mean reference values and are not guaranteed. Also, please consider our "Notes on technical specification".

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Last update: May 21, 2024