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4. MSA: internal seed alignment
WARNING
Do not operate the amplifier above the
Maximum current, unseeded
without an appropriately coupled input seed. Operation exceeding that
condition can cause fatal structural degradation of the
TA
diode. Refer to
the
Maximum current, unseeded
specified in the amplifier test report.
WARNING
The isolators contain very strong magnets - much stronger than ex-
pected. Do not bring any e.g. steel objects within 50 mm of the isola-
tors.
4.1 Small adjustment to seed alignment
After initial setup (chapter 3), an
MSA
system may require a small adjust-
ment to the seed laser alignment. With reference to figure 4.1, optimise
the seed alignment using the procedure outlined below.
1. Ensure proper seed laser operation according to the instructions
provided in the
MOGL
abs
CEL
cateye laser user manual.
2. Take note of the
Maximum current, unseeded
listed in the
MSA
test
report and the maximum expected output power at this
TA
current.
3. Terminate the
TA
output beam path with a power sensor rated to
at least the power noted in step 2, preferably after the isolator at
location
E
in fig. 4.1.
NOTE: Measuring the
TA
output power before isolator could damage
the
TA
diode with a back-reflection from the power sensor. Take care
to avoid normal incidence reflections.
NOTE: If a sufficiently slim power sensor is not available, insert
a mirror in the beam path after (preferably) or before the output
isolator to deflect the beam to a larger sensor.
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