Abstract

A highly efficient double-clad ${\mathrm{Yb}}^{3+}$-doped fiber laser with a novel cladding geometry is described. A round double-clad fiber with a small D-shaped hole for breaking a circular symmetry in a cladding combines the advantages of ease of manufacture and handling round fibers with efficient absorption of pump light. Fiber lasers with a double-D cladding shape and a D-hole cladding are compared. We report what are to our knowledge the highest slope efficiencies of 73% and 69%, respectively, pumping at 915 nm. Output powers in excess of 13 W are demonstrated.

© 2003 Optical Society of America

High-power, low-noise, Yb-doped, cladding-pumped, three-level fiber sources at 980nm

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