Large Mode Area Solid-Core Photonic Bandgap Yb-Doped Fiber With Hetero-Structured Cladding for Compact High-Power Laser Systems

Laurent Bigot (1) , Olivier Vanvincq , Andy Cassez , Remi Habert , Hicham El Hamzaoui , Karen Baudelle , Stephane Plus , Damien Labat , Mohamed Bouazaoui , Yves Quiquempois , Geraud Bouwmans , Frederic Audo , Thierry Chartier , Eric Lallier , Benoit Sévigny , Esben Ravn Andresen , Alex Chedid

1 Photonique - Photonique

In its standard implementation, spatially and spectrally resolved (S 2) imaging consists in recording near field intensity patterns as a function of the wavelength, followed by a Discrete Fourier Transform (DFT) to assess differential group delays, as well as optical power distribution between modes for the given injection as long as the higher-order mode powers are low. Here we present a variant of S 2-imaging which does not make use of DFT. The method is more robust to wavelength jitter of the laser source. Furthermore, in special cases, the method allows retrieving relative modal powers without constraints on HOM power.

Domaines: Optique / photonique

Laurent Bigot, Olivier Vanvincq, Andy Cassez, Remi Habert, Hicham El Hamzaoui, et al.. Large Mode Area Solid-Core Photonic Bandgap Yb-Doped Fiber With Hetero-Structured Cladding for Compact High-Power Laser Systems. Journal of Lightwave Technology, 2021, 39 (14), pp.4809-4813. ⟨10.1109/JLT.2021.3073590⟩. ⟨hal-03416409⟩