Zero Length Viewport, CF-4.5 in., Fused Silica, DUV Laser Grade, AR Coating at 532nm and 1064nm, 2.69" View Diameter, 304 Stainless Steel.
These zero length viewport are on a CF-4.5 in. flange and have a 2.69" view diameter (clear aperture). They are used for ultra-high vacuum applications are dual coated for antireflection at 532nm and 1064nm on both sides. These fittings use a copper gasket and steel knife-edge to achieve an ultra high vacuum compatible seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 200 °C for bake out. North American flange sizes are given by flange outer diameter in inches. These vacuum fittings are made of stainless steel.
Specifications:
Material: Corning HPFS 7980 Fused Silica
TWD <4 @ 632nm (Peak to Valley)
Parallelism < 10 arc seconds
Surface Finishc: 20/10 Scratch-Dig
Thermal Range: -100 °C to +200 °C
Homogeneity Grade: A
Inclusion Class: 0
Dual AR Coating Both Sides @ 532 & 1064nm, R < 0.25% Per Surface
Laser Damage Threshold: 10 J/cm
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