KW-power single power single-mode fiber lasers mode fiber lasers using 20 using 20-µm core Yb-doped DC fibers doped DC fibers

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Demonstrated 810-W SM output with 20 W SM output with 20µm core fiber core fiber. Predicted >5 kW SRS threshold in 20 Predicted >5 kW SRS threshold in 20µm core @ R(λR)<42 dB