... :Material: BK7, Fused Silica, SF10, CaF2, Sapphire .etc.Design Wavelength: 632.8nmDimension Tolerance: +0.0/-0.1mm Thickness Tolerance: ±0.2mm ... %Centration: 80%(Small Size), >95%(Laege Size)Surface Accuracy: λ/2@632.8nm Surface Quality: 60/40(General),10/5(High Precision ...