Abstract
In this work we measure how photodarkening affects the optical efficiency for three different -doped silica fibers operating at , one of which is codoped with cerium. A volume Bragg grating is used for linewidth control and added rejection of amplified spontaneous emission. Several hours of degradation-resistant operation is obtained with the Ce-codoped fiber, while for the doped fibers a large drop in efficiency is observed within the first hour of operation. Our results show that -doped fibers could be excellent candidates for high-power fiber laser sources.
© 2010 Optical Society of America
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