Request InfoEdmund Optics Inc.Quarter-wave window coatings from Edmund Industrial Optics reduce reflections and distortions in laser and electronic imaging applications. The units have a maximum peak-to-valley surface roughness of approximately 150 nm and have parallel surfaces to 1 arc min. The windows are available with diameters that range from 5 to 50 mm and thicknesses of 2, 3 or 4 mm. 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