The coatings of our protected aluminum broadband SEA-UV front surface mirrors consist of a metallic aluminum layer that is protected by a thin SiO2 (quartz) overcoating.
Unprotected bare-aluminum metal coatings oxidize quickly when exposed to oxygen and are very sensitive to scratching. For these reasons we apply the thin quartz layer to the aluminum coating to prevent oxidization and make the mirrors more scratch resistant. Compared to soft and sensitive bare-aluminum metal coatings our protected aluminum mirror coatings are harder and more resistant to scratches. However, they still are more sensitive to scratching than our SEA-VIS enhanced aluminum mirrors for example, which for physical reasons can have a significantly thicker protection layer. Because a metal coated mirror that should reflect UV-wavelengths can only have a very thin protective quartz overcoating the possible SiO2-layer thickness is limited. Due to the great UV-transmittance and low absorption of the very thin SiO2-layer within the UV-wavelength area the desired high ultraviolet reflection of the metallic aluminum coating to a great extend is retained. If this layer was thicker it would absorb most of the UV-light. This is why the scratch resistance of protected aluminum mirrors generally is limited and such 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. In addition the mirrors feature a high and broadband optical reflection from the ultraviolet to the infrared light range. Only close to around 700-870 nm there is a small reflection drop down to slightly below 80%. Above this wavelength area the reflection stays continuously high up to 10 µm. Therefore, the SEA-UV protected aluminum mirrors can work as laser mirrors for multiple-wavelengths at the same time. For example they can simultaneously reflect an invisible ultraviolet laser beam and a visible or infrared laser beam.
By adding additional thin dielectric coatings the reflectivity of the metallic aluminum mirrors can be modified and increased for a special wavelength or particular optical reflection ranges. Please use our custom coating request form to conveniently request a quotation for mirror optics for your special requirements. Please contact us if you need additional information or technical support.
You might wonder why we don't have standard sized mirrors and a shopping cart? As a manufacturing company we are not limited to a few fix sized optics like most trading companies are. We are specialized in quick fabrication of custom sized mirrors to supply the best possible support to our customers. Hence, our delivery time even for optics with custom dimensions at large quantities based on any of our coatings made regularly is usually less than a week. That is quicker than most re-sellers can be with their fixed size stock mirrors and it often is of great advantage to the user that the size of the optics perfectly fits into the application. So no shopping cart is necessary at all.
To quickly receive a quote for our SEA-UV protected aluminum front surface mirrors, with custom dimensions please click the button below:
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 is optimized for higher VIS reflection. For near infrared wavelengths we make the SEA-NIR mirrors which are enhanced and optimized for NIR-reflectivity.
All given details and specification are mean reference values and are not guaranteed. In addition please consider our "Notes on technical specification"