Abstract
Peak power in single frequency fiber amplifiers is limited by stimulated Brillouin scattering (SBS) especially for pulse duration longer than the phonon lifetime (~10 ns). The SBS threshold can be increased by scaling the fundamental mode effective area. This is difficult to do without compromising the beam quality in Erbium-ytterbium doped fibers (Er-Yb) for which the use of phosphorous leads to large NA and perturbated refractive index profile. Alternatively, low-NA ytterbium-free erbium doped LMA fibers have been recently introduced in the P2O5-Al2O3-SiO2 (PAS) glass matrix. Peak power as large as 950W with 12% efficiency and 4 kW with 4% efficiency have been demonstrated in single mode fibers [1]. In this work we report on results obtained with an erbium-ytterbium doped PAS fiber. It has been previously demonstrated that the simultaneous codoping by alumina and phosphorous reduces the refractive index leading to lower NA cores [1, 2]. However, it was also shown that this can strongly reduce the erbium-ytterbium fibers optical efficiency although the cause was not clearly identified [2]. This work shows that good beam quality can be obtained with high efficiency and high peak power in Er-Yb PAS.
© 2015 IEEE
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