We report the design of an inexpensive and flexible fibre-optic bundle high vacuum feed-through that\udcan be constructed from easily available Swagelok Ultra-TorrTM stock parts. The fibre bundle extends\udthrough the vacuum envelope and thus does not suffer the transmission losses encountered when using\udface-to-face couplings. The flexibility of construction allows the fitting to be customised to suit all flange\uddesigns such as CF, KF or custom mountings. The use of VitonTM o-rings allows modest baking (max\ud200 C) for high vacuum applications and fibre bundles can be easily repositioned, removed or replaced.
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