In this work, the confined-doped fiber with the core/inner-cladding diameter of 40/250 µm and a relative doping ratio of 0.75 is fabricated through the modified chemical vapor deposition method combined with the chelate gas deposition technique, and subsequently applied in a tandem-pumped fiber amplifier for high power operation and transverse mode instability (TMI) mitigation. Notably, the impact of the seed laser's power
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