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            These Fused-silica Windows are in UV grade material (Spectrosil B or equivalent) and usable down to 170nm. They have excellent chemical and radiation resistance, and are usable up to 1050°C, and have very low fluorescence. They are listed both coated and with a multiplayer AR-coating for 248-400nm.
            When the broadest transmission spectrum is required (from 185nm to over 2 microns) together with high durability, all for a reasonable cost, these windows are ideal. Fused silica is physically robust and resists chipping and scratches. The coefficient of thermal expansion is quite low, so these windows maybe subjected to higher levels of thermal shock than glass or sapphire can withstand. Circular, square and rectangular shapes available.

            Standard Specification

            Material: BK7 grade A optical glass
            Diameter Tolerance: +0.0, -0.1mm
            Thickness Tolerance: ± 0.2mm
            Clear Aperture> 85%
            Parallelism<1 arc minute
            Surface Quality: 60-40 scratch and dig
            Flatness: λ/4 per 25mm @632.8nm
            Wavefront Distortion: λ/4 per 25mm @632.8nm
            Bevel: 0.25mm x 45°
            High precision specification and coaitng are available upon request


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