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High-power Efficient Yb-doped Fiber Laser with Low Quantum Defect

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Abstract

Using an ytterbium-doped-phosphosilicate double-clad leakage channel fiber with ~50µm core and ~420µm cladding, we have achieved ~70% optical-to-optical efficiency at 1018nm. The much larger cladding enables use of high-power low-brightness diodes, a key for efficient kW operation.

© 2015 Optical Society of America

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