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Figure 5-6: Checking the stability of the adjustement
COUPLING ON A MULTI-MODE FIBER
Fiber coupling on the combiner is also available with multimode fibers. The standard fibers have a numerical
aperture of 0.22, a core diameter of 50 microns. Contact Oxxius if you need to connect fibers of alternative
specifications.
The coupler consists of a mechanical holder positioned inside the laser shutter (referring to figure 4-7). On
the front face of the holder are the screws that will define the alignment of the fiber against the beam.
This procedure explains how to retrieve an optimal coupling efficiency.
Figure 5-7: Position of the adjustement screws and counter-screws
- The mechanical holder has been centered with regards to the beam (using the positioning screws of
the shutter). This operation is performed at Oxxius and we recommend not to disturb this
positioning.
Proper protection measures against laser light must be enforced.
To avoid damaging the fiber end face, the following adjustment procedure should be
performed at low optical power (50mW or below)
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