A cladding-pumped, high-power amplifier was built incorporating a star-shaped, Yb-doped filter fiber. Pulsed amplifier measurements demonstrate strong suppression of stimulated Raman scattering accomplished by a special index profile with an up-doped ring.|A cladding-pumped, high-power amplifier was built incorporating a star-shaped, Yb-doped filter fiber. Pulsed amplifier measurements demonstrate strong suppression of stimulated Raman scattering accomplished by a special index profile with an up-doped ring.

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