Specifications:
Substrate Material: sapphire
Orientation: C A R or free
Diameters Available:2mm to 320mm
Diameter ToleranceL+0.00/-0.05mm
Surface Quality:40-20 or better
Surface Flatness:1/4 lambda
Surface Irregularity (Peak to Valley):1/2lambda
Clear Aperture:>90% of diameter
Ovality:+0.00/-0.02mm
Coating: on request
For more details, please visit http://www.betteroptics1.com