Large-mode area (LMA) thulium-doped fibers (TDF) are one of the key components when designing 2μm laser and amplifier systems aiming to further scale deliverable output powers. Current design limitations of LMA TDF’s affecting optical-to-optical efficiency and output beam quality are well-understood. In the present work, design optimizations focused on the core and pedestal waveguides of the active fiber are proposed. Using experimental and numerical tools, the effect of splice-induced heat on the refractive index profile of the active fiber is investigated. We demonstrate that fibers designed with larger pedestal-to-core ratios suffer less index distortions during splicing allowing the end-user to achieve high coupling efficiencies and high beam qualities in a reliable fashion.
C. Jollivet, K. Farley, M. Conroy, H. Dabhi, J. Edgecumbe, A. Carter, and K. Tankala, "Design optimization of Tm-doped large-mode area fibers for power scaling of 2 µm lasers and amplifiers," Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100830I (Presented at SPIE LASE: January 31, 2017; Published: 7 March 2017); https://doi.org/10.1117/12.2250549.
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