Material   Zinc Selenide    Flatness   Lambda at 633 nm per inch   Scratch-Dig   80 - 50   Size tolerance   ± 0.1 mm   Parallelism   less than 5 arc minutes   Clear aperture   90 %   Bevels   (0.2-0.5)mm x 45°
Diameter, mm Thickness, mm Part Number 12.7 2 W17-05 25.4 3 W17-10 38.1 4 W17-15 50.8 6 W17-20 76.2 8 W17-30 101.6 12 W17-40 Sizes up to 200 mm diameter x 20 mm thickness are available by special order.

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