Vacuum Viewports
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Materials Available:

Calcium Fluoride (CaF
2); both IR grade and Excimer grade,
Magnesium Fluoride  (MgF
2),   Barium Fluoride  (BaF2),
Lithium Fluoride (LiF),   Potassium Bromide (KBr),
Potassium Chloride (KCl),   Sodium Chloride (NaCl)
Zinc Selenide (ZnSe),   Germanium (Ge),
Fused Silica and other glasses.