Vacuum Feed-Throughs
The fiber cables with vacuum feed-through made by Schäfter+ Kirchhoff are equipped with single-mode fibers, polarization-maintaining single-mode or multi-mode fibers for wave lengths from 360 to 1800 nm (in case of single-mode: cut off wavelengths 360 - 1550 nm with a bandwidth up to 300 nm). For the available fiber and connector types, see Tables 2, 3 and 4, p. 52 ff. The feed-throughs are sui table for vacuums down to 10 -7 mbar and are supplied with either a small flange KF16 (DIN 28403, stainless steel) D or a screw-type flange (M12 x 1 mm, nickel silver) E .
Also available are multiple fiber cable feed-throughs with flange type KF40 or KF50. Arbitrary fiber cable types can be combined in one flange. On the vacuum side, the fiber cables have a Ø 900 μm buffer made of Hytrel. Outside the vacuum, there is a Ø 3 mm cable with Kevlar strain-relief at the fiber connector and at the flange. For vacu um feed-throughs with single-mode fibers, the connector away from the vacuum can be core-aligned as an option (< 0.5 μm). Single-mode and polarization-maintaining fiber cables can be equipped with end caps for reducing the power density at the fiber end-face (type V-E).