Accu-Glass Products' demountable substrate vacuum viewport flanges are an economical "alternative" to fused and/or brazed viewport solutions. They are available with Accu-Sol high-transmission glass or quartz (fused silica) substrate materials. Quartz versions are offered in coated and uncoated configurations. Substrate Transmission varies by material and/or coating option. Accu-Sol glass has greater than 90% transmission over the 350~2200nm spectral range. Quartz substrates are available with specially formulated broadband (BBAR) anti reflection coatings for better than 99% transmission in the following discrete wavelength ranges... 290~370nm (UV), 350~700nm (A), 650~1050nm (B), 1050~1620nm (C). Uncoated quartz transmission varies from 70~95% over the 200~2200nm range.
The substrate removal (demountable) feature of these vacuum viewports allows optional (custom) optical coatings or for easy cleaning of the window substrate. For high temperature applications up to 250°C, Kalrez® O-rings can be used. Accu-Glass demountable vacuum viewports employ a unique recessed zero profile substrate design, providing widest viewing angles while offering maximum protection.