Material   Zinc Selenide    Surface figure   Lambda/2 at 633 nm per inch   Scratch-Dig   80 - 50   Diameter   tolerance   ± 0.1 mm   Paraxial   Focal Length   Tolerance   ± 2%   Centration   less than 5 arc minutes   Clear aperture   > 80%   Bevels   (0.2+0.3)mm x 45°

D, mm FLx, mm R, mm tc, mm te, mm Part Number 12.7 12.7 17.78 3.2 2.0 PCX17-01 12.7 19.0 26.67 2.8 2.0 PCX17-02 12.7 25.0 35.00 2.6 2.0 PCX17-03 19.05 19.0 26.67 3.8 2.0 PCX17-04 19.05 25.0 35.00 3.3 2.0 PCX17-05 19.05 50.0 70.00 2.7 2.0 PCX17-06 19.05 75.0 105.00 2.4 2.0 PCX17-07 25.4 25.0 35.00 4.4 2.0 PCX17-08 25.4 50.0 70.00 3.2 2.0 PCX17-09 25.4 75.0 105.00 2.8 2.0 PCX17-10 25.4 100.0 140.00 2.6 2.0 PCX17-11 38.1 50.0 70.00 5.6 3.0 PCX17-12 38.1 75.0 105.00 4.7 3.0 PCX17-13 38.1 100.0 140.00 4.3 3.0 PCX17-14 38.1 150.0 210.00 3.9 3.0 PCX17-15 50.8 50.0 70.00 7.8 3.0 PCX17-16 50.8 100.0 140.00 5.3 3.0 PCX17-17 50.8 150.0 210.00 4.5 3.0 PCX17-18 50.8 200.0 280.00 4.2 3.0 PCX17-19 50.8 250.0 350.00 3.9 3.0 PCX17-20 * Numerical parameters correspond to Lambda=10.6 µm (n=2.4)

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