MIC Sapphire

Dimensional range, limit deviation (mm)

Item Radius of curvature(SR) Caliber(D) Wall thickness(T) Dome height(H)
Dimension range 10 ~ ∞ φ20 ~φ400 ≥ 1 ≤SR2

Technical criteria

Item Average Precise Ultraprecise
Facial contour (632.8nm) N 5λ 2/5λ λ
Irregularity degree △N 1 1/2 1/4
Surface quality  MIL 80/50 60/40 40/20
Surface roughness（nm） 1.5~2.5 0.5~1.5 < 0.5
Edge thickness difference 0.05 0.02 0.01
Wall thickness uniformity 0.10 0.05 0.02
C axis deviation ≤5° ≤2° ≤0.5°
Center deviation X 5′~  2 2′~  1 ≤ 1′
Crystal orientation C、A、M optional 
Transmittance Under 632.8nm wavelength>85%
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