Degradation-resistant lasing at $980\mathrm{nm}$ in a $\mathrm{Yb}∕\mathrm{Ce}∕\mathrm{Al}$ -doped silica fiber

Abstract

In this work we measure how photodarkening affects the optical efficiency for three different $\mathrm{Yb}∕\mathrm{Al}$-doped silica fibers operating at $980\mathrm{nm}$, 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 $\mathrm{Yb}∕\mathrm{Al}$ doped fibers a large drop in efficiency is observed within the first hour of operation. Our results show that $\mathrm{Yb}∕\mathrm{Ce}∕\mathrm{Al}$-doped fibers could be excellent candidates for high-power $980\mathrm{nm}$ fiber laser sources.

© 2010 Optical Society of America

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