Abstract

We have fabricated and tested a composite fiber with an Yb3+-doped phosphate glass core and silica cladding. Oscillation with a slope efficiency of 74% was achieved using core pumping at 976 nm with fiber lengths of 48–90 mm in a simple laser configuration, where the cavity was formed by a high-reflectivity Bragg grating and the cleaved fiber end. The measured M2 factors were as low as 1.05–1.22 even though the fiber was multimode at the lasing wavelength.

© 2015 Optical Society of America

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