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8-2 Maintenance: how to optimizing the fiber
injection
If, for any reason, the output power seems to be lower than its original value, then it might be necessary to
optimize the coupling ratio of the laser sources. This is achieved by re-adjusting the steering elements or the
coupling system.
REQUIRED EQUIPMENT:
- An optical power-meter adapted to the range of power and wavelengths to be measured (typically
a few hundreds of milliwatts from 375nm to 980nm; refer to the manufacturing test report for
specific information about the emitted wavelengths),
- Some individual protections against laser radiation. At this purpose, refer to the wavelength range
label and check its emission wavelength and maximum power. To located this label, refer to
Section 1, “Safety Information”,
- A pair of hexagonal (“Allen”) keys: 1.5mm and 2mm.
Refer to the packing list in section 2, “Getting started”.
Adjusting the mirrors involves a direct access to the illuminated optics. Be sure
to process with care:
• Wear the laser protection equipment adapted to the emitting laser
source
• Operate in a dust-free environment,
• Never touch the mirrors or other optical elements on their active
surface
Proceed through the following steps:
1. Install your power-meter at the output of the delivery fiber
2. Wear your protection equipment against the laser radiation, then power up the combiner
3. Remove the top cover of the optical head using the screws on its side. Note that the safety switch,
released, will then inhibit the laser emission
4. De-activate the safety interlock by pushing the panel safety switch set. Be careful as the emission
will be resumed instantaneously.
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