... , including BK7 glass, other specific glass, Fused Silica, Sapphire, CaF2, etc..BK7 Windows High ... Expansion!Wide Wavelength RangeHigh Precision Fused Silica WindowsStandard Fused Silica WindowsSpecifications:Material: UV grade Fused SilicaTransmission Range: 0.185-2 ... 633nmWavefront Distortion: l /8 per 25mmSpecifications:Material: UV grade Fused SilicaTransmission: 0.185-2.5 μmDiameter Tolerance ...