Abstract

Thermally induced output power enhancement and threshold reduction in an ${\mathrm{Er}}^{3+}/{\mathrm{Yb}}^{3+}$-codoped optical fiber laser at $1.54 \mathit{\mu }\mathrm{m}$ pumped by $1.064‐\mathit{\mu }\mathrm{m}$ cw radiation is demonstrated. Steady fourfold output power increase and threshold decrease were achieved by heating of the ${\mathrm{Yb}}^{3+}$-sensitized ${\mathrm{Er}}^{3+}$-doped fiber laser medium in the temperature range 23–150 °C. The laser efficiency thermal behavior is assigned to the temperature-dependent effective absorption cross section of the ytterbium sensitizer through the so-called multiphonon-assisted anti-Stokes excitation process.

© 1999 Optical Society of America

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