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Heavily Yb-doped (14300 ppm) preforms and fibers were prepared by the sol-gel method and dip coating-rapid thermal annealing technique. Optical properties of these preforms and fibers were measured and discussed. A fiber laser at a 1053-nm wavelength was realized and its slope efficiency was measured to be 88.4%. The excellent performance of the fiber laser and repeatability show that the novel approach...
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