Coating on special substrates
LASEROPTIK uses dedicated equipment for dielectric coatings on large optics up to 2 m in length (long axis for rectangular shapes) or 1 m in diameter with a superior spectral uniformity over the complete surface and high LIDT values. Approved automated ultrasonic and manual cleaning procedures are deployed to guarantee an optimum cleanliness also on these large scale geometries. The possible sizes are listed in the table below.
The uniformity of the coatings is a critical factor for applications in industrial laser systems for laser beam expansion or in projects for gravitational and petawatt laser research. Coating design, inner architecture of the machine and in-situ process control help to reduce gradient effects to a minimum. The uniformity can also be adapted to radii of curvature, e.g. of cylindrical lenses.
A variance in central wavelength of below ± 1% can be achieved for optics up to 2000 mm in length.
The 8 measured curves below show the excellent uniformity on a large optic (long axis > 1300 mm) coated with an IBS broadband AR.
A tailored environment made of separated cleanrooms, dedicated inspection metrology and optics' cleaning solutions was built for and around the innovative equipment. It is part of a department that specializes in large round and rectangular optics, addressing highest demands for LIDT, losses and spectral performance.
A space-resolved quality inspection is performed on the whole dimension for surface defects and spectral properties. Large optics are being escorted in custom-built lifting and handling tools for inspection, transportation and fixing in the coating machine.