High‐Power Fiber Lasers and Amplifiers: Fundamentals and Enabling Technologies to Enter the Upper Limits

Thomas, Sabu; Eberhardt, Ramona; Limpert, Jens; Tünnermann, Andreas

doi:10.1002/9783527648641.ch2

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Air-clad Fibre1

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“…The solution is fully consistent with the FEM simulation of the air-clad fibre presented in Ref. 28. The analytical solution agrees very well with the numerical one, but it underestimates temperature in layers outside the air-clad…”

Section: Air-clad Fibresupporting

confidence: 82%

Opto-Electronics Review

Grábner,

Peterka,

Honzátko

2021

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High power fibre lasers need to be cooled efficiently to avoid their thermal damage. Temperature distribution in fibre should be estimated during the fibre laser design process. The steady-state heat equation in a cylindrical geometry is solved to derive a practical formula for temperature radial distribution in multi-layered optical fibres with arbitrary number of the layers. The heat source is located in one or more cylindrical domains. The validity of the analytical formula is tested by comparison with static heat transfer simulations of typical application examples including octagonal double clad fibre, air-clad fibre, fibre with nonuniform, microstructured core. The accuracy sufficient for practical use is reported even for cases with not exactly cylindrical domains.

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Section: Air-clad Fibresupporting

confidence: 82%