22 February 2017 Numerical optimisation of pump absorption in doped double-clad fiber with transverse and longitudinal perturbation
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Abstract
We report on the impact of the cross-sectional shape of the inner cladding of double-clad fiber on pump absorption using a Beam Propagation Method based on azimuthal harmonics expansions and the so-called "superformula" to describe complex shapes. The impact of shaped cladding and of the fiber layout on pump absorption of double-clad fiber is studied. We observe that for nearly circular cross-section fibers the pump absorption can be enhanced to match that of fiber with strong azimuthal asymmetry, through optimised fiber layout that maximizes pump mixing.
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Christophe A. Codemard, Andy Malinowski, Michalis N. Zervas, "Numerical optimisation of pump absorption in doped double-clad fiber with transverse and longitudinal perturbation", Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 1008315 (22 February 2017); doi: 10.1117/12.2252091; https://doi.org/10.1117/12.2252091
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