Substrate Material: BK7, SI, GE, etc.
Surface shape: λ/4@632.8nm or better
Size:Φ5～Φ700
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
Coating: AL, Ag, Au