Custom-Made Step and Wedge Windows | ARD Optics Introducing ARD Optics' Custom Made Step and Wedge Windows - precision optical solutions designed for demanding applications. Our windows are meticulously crafted from a variety of materials including Sapphire, ... Inquire Price Sold by: ARD-OPTICS Ships from: Armenia Specifications Material: Custom, BK7, GaAs, Sapphire, Chalcogenide Glass, Cleartran, Si, Ge, ZnS, ZnSe, BaF2, MgF2, IR Grade CaF2, CaF2, IR Grade FS, UVFS, FS Surface Flatness: Other, Lambda/10, Lambda/8, Lambda/6, Lambda/4, Lambda/2, Lambda Surface Quality (Scratch-Dig): 10-5, 20-10, 40-20, 60-40, 80-50 Wedge Angle: 1 arc minutes Diameter: 1 mm