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Yb-doped photonic-bandgap fiber sources operating at the long-wavelength edge of the gain band are presented. Novel gain-profile engineering by the bandpass distributed filtering enables amplified-spontaneous-emission-free gain and power scaling to >;15dB and >;160W at 1178nm.
Here we report an 1178 nm all Yb-fiber laser source power-scaled by solid-core photonic bandgap fiber (SC-PBGF) for 589 nm generation. A 1.4 W output at 589 nm with an input power of 9 W at 1178 nm were obtained. One important advantage of PBGF is distributed filtering. Hence the gain spectrum can be designed artificially in an active-ion-doped SC-PBGF, desirable for long-wavelength Yb fiber laser...
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.
We have succeeded in direct lasing at 1178 nm with linear polarization from ytterbium-doped fiber. By composing high Q-value cavity with all-fiber configuration, parasitic lasing was suppressed. The output power amounts to 3.03 W with 49.5% slope efficiency and bandwidth of 0.037 nm. A maximum of 205 mW output power at 589 nm was obtained at the maximum of 3.03 W input power of 1178 nm laser.
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