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Fused Silica Viewports

Zero-Length Fused Silica Viewport Show Products
Zero-Length Fused Silica Viewports

Fused Silica Viewports

Zero-Length Fused Silica Viewport

Larson Electronic Glass’s  fused silica viewports are preferred over glass because of their transparency to ultraviolet radiation, higher abrasion resistance, and low coefficient of thermal expansion which makes them very resistant to thermal shock. While fused quartz and fused silica viewports are both silicon dioxide (SiO2), fused silica, which is synthetically grown, is superior to a fused quartz viewport in most regards and does not fluoresce when exposed to UV radiation at 253.7µm as will fused quartz.

NOTE: Maximum bakeout temperature limited to 200°C due to low temperature braze alloy.

Fused silica viewports are offered with Conflat® compatible CF, and ISO NW KF and LF flanges. Viewport window surfaces offer a minimum of distortion and provide maximum transmission for most applications.

Fused Silica Viewports:


  • High purity fused silica UV grade
  • Low loss ultraviolet transmission
  • Resistant to thermal shock
  • Nonmagnetic 304 stainless steel to fused silica, brazed seal
  • >90% Transmission from 230nm to 2000nm
  • Optional AR Coatings available
  • CF flanges bakeable to 200°C, 25°C/Min gradient
  • ISO NW KF and LF elastomer seal flanges bakeable to 200°C, 25°C/Min gradient


Request a quote today, or contact Larson Electronic Glass for help in selecting the right fused silica viewports for your application.