Abstract

We demonstrate an efficient, ytterbium-doped low-NA fiber with core glass containing high levels of Al<sup>2</sup>O<sup>3</sup>and P<sup>2</sup>O<sup>5</sup>in silica host that shows low-photodarkening and generated 175 W of continuous-wave output power with 80% laser efficiency.

© 2010 The Optical Society

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