An ytterbium-doped solid-core photonic bandgap fiber oscillator in an all-fiber format is investigated for high power at an extreme long wavelength. The photonic bandgap fiber is spliced with two fiber Bragg gratings to compose the cavity. The sharp-cut bandpass distributed filtering effect of the photonic bandgap fibers efficiently suppresses amplified spontaneous emission in the conventional high-gain region. Fine adjustment of the short cut-off wavelength by coiling with tighter diameter is performed to suppress parasitic lasing. A record output power of 53.6 W with a slope efficiency of 53% at 1178 nm was demonstrated.
1178nm ytterbium-doped photonic bandgap fiber amplifier with strictly amplifiedspontaneous-emission-free, 167W output has been achieved with 61% slope efficiency. Singlepass frequency doubling to 14.5W 589nm light was also demonstrated with 34% conversion efficiency.
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