Inrad Optics fabricates transmission flats from highly homogeneous, bubble-free fused silica, which we then polish to the interferometric standards required by precision optics manufacturers.
Coating Options. Transmission flats are available uncoated, with a standard coating or with a custom coating on each surface. When coated, the front or reference side is coated with a partial reflector to enhance contrast of the fringe patterns. The backside is coated with an anti-reflective coating to eliminate secondary fringe patterns. All transmission flats are coated using proprietary evaporative vacuum coating processes—both Ion Assist and Plasma Assist E-Beam.
Mounting Options. Transmission flats are available as standalone optics or mounted in ring style mounts. The mounted transmission flats fit industry-standard Fizeau interferometers for easy replacement and installation.
Packaging. Each transmission flat is packaged in a PET-G container for unmounted glass or in a wooden box when mounted to the Inrad Optics designed ring.