Surface shape: λ/10@632.8nm or better
Surface quality: S/D 40/20 or better
Diameter Tolerance: +0.000/ -0.01mm
Thickness Tolerance: ±0.01mm 
Focal Length Tolerance: ±2%
Typical Centricity: ≤3 minutes or better
Chamfer: 0.02″at 45°typical
Size: Φ5～Φ400mm
Antireflection Coating: According to customer requirement
R<0.15% for V-type AR coating
Damage Threshold: 10J/cm2, 8 nsec pulse, 1MW/cm2, CW at 1550nm, 1064nm, 888nm, 808nm, 532nm, 355nm, 266nm typical  Rave<0.5% for BBAR coating per surface
Clear aperture: Exceeds central 90% of dimension