Adjustment_60SMF-LSA 20.05.2021 © Schäfter+Kirchhoff GmbH
Schäfter+Kirchhoff GmbH Kieler Str. 212 22525 Hamburg, Germany +49 40 85 39 97-0 info@sukhamburg.de www.sukhamburg.com
13
Figure 26:
Finally, lock the focus setting by
fixing the two grub screws using the
screwdriver type 9D-12.
11. Alignment of the Fiber Polarization Axis
When coupling a laser beam into a polarization-maintaining single-mode fiber, the polarization axis of the
fiber must be aligned with respect of the polarization axis of the source in order to obtain a high polarization
extinction ratio. The polarization axis of the fiber is adjusted by rotating the laser beam coupler. Since both
laser beam coupler and fiber are connected, this means that the fiber polarization axis is rotated with respect
to the polarization axis, as well.
The following steps have to be performed only if the laser beam coupler is
used with a polarization-maintaining fiber cable.
Notice:
In order to adjust for the polarization axis, perform the following steps:
Figure 27:
Slightly loosen the three radially
arranged pin screws at the adapter.
Figure 28:
Now, gently rotate the laser beam
coupler. You can use the eccentric
key type 60EX-4 or 60EX-5 just as as a
lever.
The polarization extinction of the laser radiation transmitted by the fiber cable is measured using a polarization