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High-power, high-efficiency ytterbium-doped solid-core photonic-bandgap fiber amplification at the long-wavelength edge of the Yb gain band is reported. Amplified-spontaneous-emission-free, 30 W non-polarized and 25 W linearly-polarized 1178 nm outputs have been achieved with <58% slope efficiencies.
The short-wavelength cutoff property of photonic-crystal fiber was applied to Er:Yb fiber amplification. Appropriate bending gives >10 dB/m distributed filtering in the Yb band and suppression of ASE and parasitic lasing has been successfully demonstrated.
All-fiber chirped-pulse amplification based on a large-mode-area Er:Yb-doped photonic-crystal fiber is presented. A dispersion-variable hybrid fiber stretcher compensates the peculiar dispersion of the hollow-core photonic-bandgap fiber compressor yielding transform-limited 440-fs pulses with 1-W average power.
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