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High-Vacuum CF ComponentsThorlabs offers a growing line of high-vacuum-compatible CF viewports, flanges, components, and hardware. High-vacuum (HV) systems are capable of reaching and maintaining pressures down to 1 × 10-8 Torr. Our Ø2.75" HV CF Viewports support either Ø1" or Ø1.5" windows. Viewports designed for Ø1" windows are compatible with our selection of stock Ø1" windows, while viewports designed for Ø1.5" windows utilize either flat or wedged Ø1.5" High-Precision Vacuum Windows. In addition to these viewports, we offer an adapter for mounting optomechanical components to a Ø2.75" CF vacuum flange.