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Our protected aluminum front surface mirrors of the SEA-UV series are based on a metallic aluminum coating that is protected by a thin SiO2 (quartz) layer. Unprotected bare-aluminum metal coatings quickly oxidize when exposed to oxygen and such optics are sensitive to scratching. For these reasons, we deposit this thin quartz layer on top of the aluminum coating to prevent oxidization and make the mirrors more scratch resistant. Compared to the soft and sensitive bare-aluminum metal mirrors, the coatings of our protected aluminum mirrors are harder and more resistant to scratching. However, a protected aluminum mirror coating is still more sensitive to scratching than our SEA-VIS enhanced aluminum mirrors for example, which for physical reasons can have a significantly thicker protection layer. Since a metal-coated mirror optics, which is supposed to reflect UV wavelengths, can only have a very thin quartz protective coating, the possible thickness of the SiO2 coating layer 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 were thicker it would absorb most of the UV-light which is why the scratch resistance of protected aluminum mirrors generally is limited and such optics 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 reflection from the ultraviolet to the infrared light 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 optics 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 mirror optics can be modified and increased for a specific wavelength or particular optical reflection ranges. Please use our custom coating request form to conveniently get a quotation for mirror optics based on your particular requirements. Please contact us if you need additional information or technical support.
You might wonder why we don't have standard sized mirrors and there is no shopping cart? As a manufacturing company, we are not limited to a few optics with standard dimensions as most trading companies are. We specialize in the 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 significant advantage to the user that the size of the optics perfectly fits into his 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 we have optimized for higher VIS reflection by dielectric overcoatings. 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. Also, please consider our "Notes on technical specification".
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