Design of an amplifier model accounting for thermal effect in fully aperiodic large pitch fibers

Carlo Molardi, Federica Poli, Romain Dauliat, Baptiste Laconte, Dia Darwich, Rémi Du Jeu, Marie-Alicia Malleville, Raphaël Jamier, Katia Tragni, Annamaria Cucinotta

2 more authors

Stefano Selleri, Philippe Roy

2018

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DOI 10.1117/12.2290825

Data confidence 85 high

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Abstract

Yb-doped Photonic Crystal Fibers (PCFs) have triggered a significant power scaling into fiber-based lasers. However thermally-induced effects, like mode instability, can compromise the output beam quality. PCF design with improved Higher Order Mode (HOM) delocalization and effective thermal resilience can contain the problem. In particular, Fully- Aperiodic Large-Pitch Fibers (FA-LPFs) have shown interesting properties in terms of resilience to thermal effects. In this paper the performances of a Yb-doped FA-LPF amplifier are experimentally and numerically investigated. Modal properties and gain competition between Fundamental Mode (FM) and first HOM have been calculated, in presence of thermal effects. The main doped fiber characteristics have been derived by comparison between experimental and numerical results.