Abstract
In this article we present an investigation of three different fiber optic vacuum feedthroughs. Using Swagelok-type tube fittings, metal tubings containing the optical fibers are sealed into a vacuum flange. This allows for easy replacement of the feedthrough without replacing the entire flange. Employing only epoxy resin for sealing the optical fiber into the feedthough we have measured a helium diffusion rate of 2.5⋅10−10 mbar ⋅ l/s, whereas with a combination of a solderglass and epoxy resin seal we have obtained a diffusion rate below 1⋅10−12 mbar ⋅ l/s. In a third approach, using small tolerance fiber optic ferrules in our feedthroughs, we have obtained helium diffusion rates of below 1⋅10−12 mbar ⋅ l/s, making these feedthroughs well suited for ultra-high vacuum applications.
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