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We report on a monolithic thulium fiber laser with 567 W output power at 1970nm, which is the highest power reported so far directly from a thuliumoscillator. This is achieved by optimization of the splice parameters for theactive fiber (minimizing signal light in the fiber cladding) and direct watercooling. Dual transverse mode operation is visible from the optical spectrumand can also be deduced from the measured beam quality of M^2 = 2.6.\c{opyright} 2016 Optical Society of America under Open Access PublishingAgreement. Users may use, reuse, and build upon the article, or use the articlefor text or data mining, so long as such uses are for non-commercial purposesand appropriate attribution is maintained. All other rights are reserved.

Monolithic Thulium Fiber Laser with 567 W output power at 1970 nm