Abstract
A method has been proposed to suppress the 1030 nm amplified spontaneous emission (ASE) of 980 nm ytterbium-doped fiber laser (YDFL) by embedding a chirped and tilted fiber Bragg grating (CTFBG) within the cavity. The influences of the positions, pieces, and cascaded methods of CTFBG on the performance of 980 nm YDFL were investigated. By embedding a single CTFBG in the cavity of 20/80 μm 980 nm YDFL, 6.4 W output power with a slope efficiency of 27 % was achieved. To the best of our knowledge, it was the highest slope efficiency of the 980 nm all-fiber oscillator with cost-effective 20 μm core diameter double-cladding YDF. The output power was increased by 17 % and the slope efficiency was increased by 6 % compared to the situation without CTFBG at the same peak-to-peak suppression ratio of 1030 nm ASE. The beam quality factor M2 was measured at about 1.2, demonstrating a near-diffraction-limited laser. The study results have provided valuable insights for the design of a high-brightness 980 nm YDFL.
Published Version
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