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15 February 2012 Confined-doped ytterbium fibers for beam quality improvement: fabrication and performance
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By confining the Yb doping within a smaller radius in the center of the core of the few-mode large-mode-area fiber, the fundamental mode, which overlaps better with the Yb ions, sees higher gain than the higher order modes, and dominates the output. Hence, improved beam quality can be achieved. A confined-doped fiber with 41/395μm core/cladding diameters is fabricated by Direct Nanoparticle Deposition (DND) process. The fiber is characterized in an amplified spontaneous emission (ASE) source setup. Near-diffraction-limited beam quality (M2~1.3) is experimentally demonstrated.
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Changgeng Ye, Joona Koponen, Teemu Kokki, Joan Montiel i Ponsoda, Ari Tervonen, and Seppo Honkanen "Confined-doped ytterbium fibers for beam quality improvement: fabrication and performance", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 823737 (15 February 2012);

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