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Lens Savers® Premium grade protection windows are suitable for most YAG applications. Windows are available with and without anti-reflective (AR) coatings. Uncoated windows will transmit 92% of the available energy at 1.064 microns. Coated windows transmit in excess of 99% of available energy at 1.064 microns. Material: BK-7Tolerances - Diameter +0.00/-0.25mm/Thickness +0.00/-0.25mmFlatness: 1/5 wave per inch at 632.8nm over clear apertureParallelism: Less than 3 arc minSurface: 60-40Clear aperture: 90% of diameterAR coating: Less than 0.5% reflection/side 1064nm