The laser sources composing the combiner can be damaged by optical feedback, especially
the LBX models emitting in the red and infrared spectrum.
Optical feedback occurs on semiconductor laser diodes when their output is collimated and
subsequently retro-reflected. In these conditions, the retro-reflected beam focuses back
onto the laser diode facet and can create a power density high enough to damage this
facet, resulting in an irreversible degradation of the resonator. This failure mechanism is
not covered under Oxxius’ standard warranty.
Oxxius recommends his users to take the following precautions when working with the
combiner:
1) All reflective surfaces in the optical path should be angled slightly so that surface
reflections will not be reflected to the laser source,
2) Use angle-polished or anti-reflection coated fibers when coupling the light into
optical fibers,
3) Avoid using mirrors placed at normal incidence into the light path. If mirrors must
be placed at normal incidence, the use of an isolator is required.
4) Avoid focusing the beam the onto a mirrored surface without installing an isolator
into the light path,
5) Avoid sweeping the beam back and forth across the laser during alignment
operations (for example utilizing a retro-reflected beam to align through a pinhole
in a confocal microscope). If such a possibility is unavoidable, use an isolator at the
output of the laser diode during the alignment process to prevent permanently
damaging the laser
FIBER-TERMINATED OUTPUTS:
Connect the optical connector to your own light path. Make sure to properly fasten the threaded ring of each
optical connector. Small adjustments may be required after positioning the laser head in its final location.
Refer to section 5 for the re-alignment procedure.
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