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.
Christophe A. Codemard, Andy Malinowski, and 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 (Presented at SPIE LASE: February 01, 2017; Published: 22 February 2017); https://doi.org/10.1117/12.2252091.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon