Power-Scalable Photonic Bandgap Fiber Sources with 167 W, 1178 nm and 14.5 W, 589 nm Radiations

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<jats:p>1178nm ytterbium-doped photonic bandgap fiber amplifier with strictly amplified-spontaneous-emission-free, 167W output has been achieved with 61% slope efficiency. Single pass frequency doubling to 14.5W 589nm light was also demonstrated with 34% conversion efficiency.</jats:p>

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