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Yb-doped Fibers for Kw-Class Fiber Lasers

Andrea Rosales-Garcia,Jeffrey W. Nicholson,Rasmus V. Jensen,Poul Kristensen,Jose Pincha,Simona Ovtar,Miranda Mitrovic,Kasper Ingerslev, Bent Edvold, Simon Christensen,David J. DiGiovanni,Bera Palsdottir

Optical Fiber Communications Conference and Exhibition（2024）

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Abstract
We demonstrate a TMI-free 5.2 kW single-mode output from a fiber amplifier using Yb 20/400 fibers with reduced core thermo-optic coefficient. The TMI threshold is increased by 50% compared to that of commercial Yb-doped fibers.
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Key words
Fiber Laser,Yb-doped Fiber,Optical Amplifier,Commercial Fiber,Thermo-optic Coefficient,Output Power,Signal Power,Nonlinear Effects,Advanced Design,Higher-order Modes,Long-term Operation,Beam Quality,Large Effective Area,Stimulated Raman Scattering,Bending Loss
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