Commercial Quality Windows, Square, S1-UV Grade Fused Silica

Diameter Tolerance +/- 0.125 mm Thickness Tolerance +/- 0.125 mm Surface Accuracy ≤ 2λ per inch Surface Quality 60-40 Scratch-Dig or better Parallelism <10' Edges Fine ground and safety beveled* Clear Aperture 85% *parts under 25.4mm in diameter may not have beveled edges Commercial windows are used for sight glasses, instrument windows, beamsplitter substrates, vacuum windows and welding window substrates. Esco carries a complete inventory of square commercial optical windows made from S1-UV Grade Fused Silica. Don't see a part that matches exactly what you need, perhaps you'd like to modify a dimension or add a coating?  Use our fast online quote tool to find out what a modification would cost.