MDC Precision Sapphire Viewports are designed to perform reliably in high and ultrahigh vacuum (UHV) environments, supporting bake-out temperatures of up to 842°F (450°C). Each viewport is assembled using high-purity synthetic sapphire, a hexagonal single crystal material known for its anisotropic properties—meaning its optical, thermal, and dielectric characteristics vary depending on the crystal axis.

Standard viewports feature a 90° crystal orientation (parallel to the window surface), ideal for optical applications requiring consistent transmission. MDC supports integration into various vacuum systems with three flange mount styles: Conflat (CF), Kwik-Flange™ (KF), and Weldable. Custom configurations and feedthrough assemblies are available upon request.

Industry Applications

Sapphire viewports are widely used in vacuum coating systems, laser chambers, surface analysis instruments, plasma reactors, and semiconductor fabrication tools. Their high UV transparency, chemical resistance, and thermal durability make them ideal for demanding optical tasks in UHV environments where high temperatures and precise imaging are critical.