Abstract

Thermally induced output power enhancement and threshold reduction in an Er3+/Yb3+-codoped optical fiber laser at 1.54 µm pumped by 1.064µm cw radiation is demonstrated. Steady fourfold output power increase and threshold decrease were achieved by heating of the Yb3+-sensitized Er3+-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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