A polarization-maintaining Yb-doped large mode area fiber with depressed-index inner cladding layer and confinement of rare-earth dopants has been drawn as a long tapered fiber. The larger end features a core/clad diameter of 56/400 μm and core NA ~ 0.07, thus leading to an effective mode area over 1000 μm2. The fiber was tested up to 100 W average power, with near diffraction-limited output as the beam quality M2 was measured < 1.2. As effective single-mode guidance is enforced in the first section due to enhanced bending loss, subsequent adiabatic transition of the mode field in the taper section preserves single-mode amplification towards the larger end of the fiber.
V. Roy, C. Paré, B. Labranche, P. Laperle, L. Desbiens, M. Boivin, and Y. Taillon, "Yb-doped large mode area tapered fiber with depressed cladding and dopant confinement," Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 1008314 (Presented at SPIE LASE: February 01, 2017; Published: 22 February 2017); https://doi.org/10.1117/12.2250864.
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