Abstract

The operation of a diode-pumped Tm-doped silica fiber laser that uses the cladding-pumping arrangement to produce high-power cw output at wavelengths near $2 \mathit{\mu }\mathrm{m}$ is reported. We obtained a maximum output power of 5.4 W at a slope efficiency of 31% with respect to the launched pump power at a total optical-to-optical efficiency of 22%. The fiber-laser output wavelength was tuned between 1.880 and $2.033 \mathit{\mu }\mathrm{m}$ by adjustment of the fiber length, with $>4 \mathrm{W}$ of power obtainable from 1.94 to $2.01 \mathit{\mu }\mathrm{m}$. Self-pulsations detected in the output from the double-clad fiber laser may indicate the presence of ion-clustering effects.

© 1998 Optical Society of America

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