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High-power and tunable operation of erbium-ytterbium Co-doped cladding-pumped fiber lasers

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6 Author(s)
Nilsson, J. ; Optoelectronics Res. Centre, Univ. of Southampton, UK ; Alam, S. ; Alvarez-Chavez, J.A. ; Turner, P.W.
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We describe erbium-ytterbium co-doped fiber lasers in different free-running and tunable configurations. The lasers were cladding-pumped by high-power multimode diode sources. We compare pumping at 915 and 980 nm. With a free-running laser, we obtained slope efficiencies of up to 50% with 915-nm pumping and 38% with 980-nm pumping, with respect to absorbed pump power. We reached a double-ended output power of 16.8 W from the free-running laser. Thanks to a high rare-earth concentration and a small inner cladding area (possible with the high-brightness pump sources we used), the operating pump absorption of the fiber reached 8 dB/m. With such high absorption, short fibers with high nonlinear thresholds are possible even with cladding pumping. The tunable fiber laser had a tuning range from 1533 to 1600 nm and emitted 6.7 W of output power at 1550nm in a high-brightness, single-polarization, narrow linewidth beam.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:39 ,  Issue: 8 )

Date of Publication:

Aug. 2003

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