Substrate Material: BK7, UVFS, CAF2, ZNSE, ZNS, etc.
Surface shape: λ/10@632.8nm or better
Size:Φ5～Φ700 mm
Size Tolerance: +0.000/ -0.1mm
Thickness Tolerance: ±0.05mm
Flatness: ≤1 arcmin or better
Chamfer: 0.02″at 45°typical  
Clear aperture >90% or better 
Surface quality: S/D 40/20 or better
Coating wavelength: 200nm-12um