4.4 Fibre coupling 27
only 5to 10%orless. Take noteof roughlyhowmuch rotationwas
required, so you can easily return to the original position.
12. Adjust the horizontal axis of mirror M1 and maximise for output
power.Comparethenewmaximumoutputpowertotheoutputpower
obtained at step 10.
13. Repeat steps 10 to12 if thepower isincreasing, or repeat but with
reversed direction of adjustment if the power is decreasing.
14. Once horizontalalignment isoptimised, repeattheprocedure but
using vertical adjustments.
15. Iterate horizontalandvertical alignmentuntilcoupling efficiencyis
fullyoptimised.Asoptimumcouplingisapproached,theadjustments
should be reduced at each step.
16. If the coupling efficiency is less than expected, focus adjustment
may be required (see instructions at https://www.sukhamburg.com/
documents/Adjustment_SMS.pdf). Focus adjustmentis notnormally
neededunlesssevereshockhasmovedthelens,orifanewdiode
hasbeen installedinthe laser, leadingto changeofbeam waist
location.
17. Onceoptimised,recordtheinputpowertothefibrecoupler,maximum
output power, and the laser current.
18. Increasethelaser currenttothedesiredoperatingcurrentandop-
timise if needed.
19. Use thefactorytest resultsforyourlaser asreference.Degradation
may indicate facet damage on the fibre patchcord. Reversing or
replacing the fibre patchcord may be helpful.
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