EUV 193 grade viewports offer great transmission at some of the lowest frequencies possible for fused silica (Internal transmission > 99.5% at 193nm).
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A6665-3-CF | EUV Grade Fused Silica Viewport, Re-entrant Design, 3.50″ In-Vacuum Length, 1.40″ View Dia, 4.50″ Conflat Flange

A6667-3-CF | EUV Grade Fused Silica Viewport, Re-entrant Design, 3.50″ In-Vacuum Length, 2.69″ View Dia, 6.00″ Conflat Flange