Abstract
Yb-doped high power fibre lasers are attracting a lot of interest thanks to the unique combination of high efficiency, high beam quality, mechanical robustness and low maintenance costs [1]. However a phenomenon called “photodarkening” severely affects the performance of the lasers by gradually decreasing output power: the main problem is the occurrence of so called absorption centres in the laser system which may lead in time to a decrease of device performance [2].
© 2013 IEEE
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