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Viewports |
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| Sapphire Viewports Sapphire is a synthetic, hexagonal single crystal anisotropic material which displays substantially different physical, thermal, dielectric and optical characteristics when measured along different axes. MDC sapphire viewports are constructed using 90° crystal orientation, where the crystal orientation is parallel to a window’s surface. Viewports with crystal orientation parallel to the optical axis, or 0° orientation, can be custom ordered from Insulator Seal. MDC offers a wide selection of sapphire viewport assemblies suitable for high and ultrahigh vacuum applications. The use of high purity sapphire and nickel-iron low expansion alloys enables these viewports to be repeatedly baked to temperatures as high as 450°C. All sapphire viewports up to 1 inch in diameter use ultraviolet grade sapphire material. Those exceeding 1 inch diameters are supplied with regular grade sapphire. Note that limitations in current sapphire crystal growth technology make it difficult to guarantee constant transmission performance at wavelengths below 0.25µm. The sapphire viewports offered in this catalog are supplied with flat faces polished to a 50-20 scratch-dig while quartz viewports are 80-50 scratch-dig. Although these finishes are suitable for most optical applications, the optics industry recommends a 20-10 scratch-dig finish for wavelengths below 0.25µm.
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1 mm thick Reflection Losses Included (1) UV Grade (2) Regular Grade |
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