Saint-Gobain Crystals has released a high-reflectance coating for Excimer laser-based scanning applications needing high reflectivity over a range of incident angles and broad-wavelength bandwidths.
The Alpine Research Optics thin film is a UV-enhanced aluminium coating that delivers more than 95 per cent reflectivity at 193nm (at 45 degrees incidence), while also offering an average reflectivity of greater than 85 per cent over the 400 to 1000nm spectral range.
The metal/dielectric hybrid coating also delivers more than 90 per cent reflectivity at 193nm over an angle of incidence range of +/-10 degrees, which is difficult to accomplish with an all-dielectric design.
The primary application for this high-reflectance coating is in Excimer laser-based systems used for ophthalmic procedures, such as Lasik and PRK.
In these instruments, the scan mirror for the Excimer laser beam can also form part of the optical path for a visual inspection system or near-infrared camera system, so high reflectance in both spectral regions is necessary.
Saint-Gobain Crystals can supply this coating on a variety of substrates suitable for galvanometer scanners.
These include rectangular fused silica substrates with chamfered edges.
Other materials and substrate shapes are available upon request.
