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OPTICAL QUALITY STANDARDS The U.S. Military defines Quality Level or Grade as different striae levels per Din 3140 and according to MIL-G-174-B. Striae is localized inhomogeneity within the optical material. Test is UNIVERSAL PHOTONICS INCO RPO R AT E D visual and compared against reference samples. Since this type of test is nonquantitative, the following list is based on homogeneity measurement of the index changes within a material by interferometric testing. C AT E GO RY nd S PE C 1. Commerical Not specified (typical application is front surface) mirror 2. Grade B +/- 1 x 10-4 3. Grade A +/- 1 x 10-4 4. H-1 +/- 2 x 10-5 5. H-2 +/- 5 x 10-6 6. H-3 +/- 2 x 10-6 7. H-4 +/- 1 x 10-6 8. H-5 +/- 5 x 10-7 FORMULA FOR WAVEFRONT DISTORTION TO ND TOLERANCE: Total wavefront distortion ƛ = + Surface Contribution = 2(n-1) δ Inhomogeneity Contribution + (Δ nmax) t 4 SO UR C E: ZY GO C ORP., D Y NA SIL C ORP., AN D A. G.I . Where: • • • • • ƛ is the wavelength of light to be used t is the geometrical thickness along the optical path n is the average refractive index for material in visible δ is the Peak to Valley departure for flatness of one surface 2(n-1) is the worst case contribution of both surfaces Note: A nanogram can be used to determine the specification of inhomogeneity once the limit of the wavefront distortion is determined using the equation: (Δ n max ) = Ʃy t Where: • ƛ is the wavelength of light used in the interferometer • Ʃ is the fringe deviation (P-V) • t is the sample thickness; i.e., dimension along the light path in the interferometer Advanced Surfacing Products & Technology • T: 800.645.7173 T: 516.935.4000 [email protected]