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Protected Aluminum Mirrors

AL-front surface mirrors for ultraviolet light

SEA-UV Series

Special Properties

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

Typical Applications

  • Ultraviolet mirrors
  • Mirrors for ultraviolet lasers
  • 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 mirror optics
  • UV mirrors for disinfection systems

Related mirror types

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48h-Express Service Also available in 48 h Express-Service

Protected aluminum front surface mirrors are used whenever a high reflection in the ultraviolet wavelength range is required. Our SEA-UV protected aluminum mirror series has an aluminum metal coating covered by a thin SiO2 (quartz) layer. Unprotected bare-aluminum metal coatings quickly oxidize when exposed to oxygen. Also, such optics are very sensitive to scratching. For these reasons, we deposit a thin quartz layer on top of the aluminum coating of the SEA-UV to prevent oxidization and make the mirrors more scratch-resistant and durable. Therefore, compared to soft and sensitive bare-aluminum metal mirrors, our protected aluminum mirrors' surface is more rigid and resistant to scratching. However, a protected aluminum mirror coating is still soft and more sensitive 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. Hence, protected aluminum mirrors should not be used in harsh environments or when exposed to mechanical abrasion.

The reflection of our protected aluminum mirror coatings is far less angle-dependent than that of dielectric mirror coatings. Moreover, the mirrors feature a high and broadband optical reflectivity from 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. Therefore, 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 metallic mirror's reflectivity for a specific wavelength or a particular optical reflection range by adding thin dielectric coatings. Please use 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 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–h 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 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

In case you need mirror optics solely for the visible wavelength range, please take a look at our SEA-VIS- enhanced aluminum front surface mirror, which we have optimized for higher VIS reflection by dielectric overcoatings. Also, check out our SHP-silver metal mirrors. For the near-infrared wavelength spectrum, you can use 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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