MDC vacuum viewports are engineered using state-of-the-art vacuum brazing technology to ensure unmatched seal reliability and leak-tight performance in ultrahigh vacuum (UHV) applications. Standard window materials include Single Crystal Sapphire and Fused Silica, both selected for their outstanding optical, thermal, and dielectric properties.

Sapphire viewports utilize a synthetic, hexagonal single crystal material with anisotropic properties, providing strength and stability at high temperatures. MDC's standard orientation is 90° (parallel to window surface), but 0° crystal orientation (parallel to optical axis) is available upon request.

Fused Silica is an isotropic, non-crystalline material offering excellent UV transparency, high abrasion resistance, and low thermal expansion. MDC provides UV grade as standard, with optional Deep UV (DUV-200), Excimer UV (EUV-185), and Infrared (IR) grades available upon request.

Key Features

UV grade synthetic Sapphire and UV grade fused silica viewports
Zero length geometry minimizes flange-to-window distance
Vacuum-brazed seals using Corning type 7056 glass and Fused Quartz
High thermal stability — withstands repeated bake-outs up to 842°F (450°C)
Available in both magnetic and non-magnetic construction
Custom optical coatings and low OH IR grade (up to 141.7 in (3600 mm)) on request

Industry Applications

These high-performance optical viewports are essential in semiconductor manufacturing, synchrotron beamlines, surface science, laser systems, and materials analysis. Their UV transparency, thermal resistance, and UHV compatibility make them suitable for high-energy light sources, plasma chambers, and spectroscopic instrumentation requiring optical access under extreme vacuum and temperature conditions.