Abstract

We demonstrate high-power operation from a singly ${\mathrm{Ho}}^{3+}$-doped silica fiber laser that is cladding pumped directly with diode lasers operating at $1150\mathrm{nm}$. Internal slope efficiencies approaching the Stokes limit were produced, and the maximum output power was $2.2\mathrm{W}$. This result was achieved using a low ${\mathrm{Ho}}^{3+}$-ion concentration and ${\mathrm{La}}^{3+}$-ion codoping, which together limit the transfer of energy between excited ${\mathrm{Ho}}^{3+}$ ions.

© 2007 Optical Society of America

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