Military Performance Specifi cation MIL-PRF-13830B describes surface quality using a “scratch” number followed by a “dig” number based on calibrated standards prescribed therein. Military Performance Specifi ca-tion MIL-PRF-13830B and ISO 10110. There are several standards for specifying surface quality such as U.S. This makes understanding surface quality specifi -cations and how they impact system performance essential to the suc-cess and cost-eff ectiveness of a system. The specifi ed surface quality directly impacts cost, therefore over-specifying your optics and using a better surface quality than required will unneces-sarily increase costs. Optics used with UV wavelengths require tighter surface quality tolerances than optics used with visible or IR systems because shorter wavelengths experience higher amounts of scatter. Sensitive systems where maximum signal strength is essential can also suff er from throughput variations and increased scattering from surface imperfections. Surface quality is more important for laser applications than imaging applications be-cause surface imperfections can be the initiating sites for laser induced damage. Section 2: Surface Quality The surface quality of an optical component is an evaluation of the sur-face imperfections, such as scratches and pits, or digs, which may be caused during the manufacturing or handling process.
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