MIC Sapphire

Dimensional range, limit deviation (mm)

Item Radius of curvature(SR) Caliber(D) Wall thickness(T) Dome height(H)
Dimension range 25 ~ 200 φ50 ~φ400 ≥ 2 ≤3/4D

Technical criteria

Item Average Precise Ultraprecise
Facial contour (632.8nm) N 5λ 7/2λ 2λ
Irregularity degree △N 5/2 3/2 1
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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