A ytterbium-doped large-mode-area step-index fiber perform was fabricated by chelate precursor doping technique. For
the purpose of raising the threshold of nonlinear effects and transverse mode instability simultaneously, a long tapered
fiber was drew by changing the perform drawing speed. The core/cladding diameter of this tapered fiber was varied from
10/155 to 26/400 μm in 18m-long with the tapering ratio of 2.6. Using this fiber as a gain medium for a fiber laser in
amplifier, the beam quality factor M2 was ~1.2 when the output power obtained over 1.2kW with slope efficiency of
74.5%. The laser output spectrum was centered at 1063.8nm with narrow 3dB bandwidth of 0.26nm. The stimulated
Raman scattering suppression ratio was about ~34.7dB.
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