Longitudinally thickness-controlled nanofilms on exposed core fibres enabling spectrally flattened supercontinuum generation

• DOI: 10.37188/lam.2021.021
• Publication Date: 2021-08-16T06:16:36Z
• Authors: Tilman A. K. Lühder; Henrik Schneidewind; Erik P. Schartner; Heike Ebendorff-H...; Markus A. Schmidt
• Keywords: Supercontinuum; Flatness (cosmology)

Nonlinear frequency conversion is a pathway to unlock undiscovered physics and implement tailored light sources for spectroscopy or medicine. A key challenge the establishment of spectrally flat outputs, which particularly demanding in context soliton-based at low pump energy. Here, we introduce concept controlling nonlinear by longitudinally varying resonances, allowing shaping soliton dynamics achieving broadband spectra with substantial spectral flatness. Longitudinally resonances are realised nanofilms gradually changing thicknesses located on core an advanced microstructured fibre. Nanofilms engineered thickness profiles fabricated tilted deposition, representing waveguide-compatible approach nano-fabrication, inducing well-controlled into system, unique dispersion control along fibre length. Key features dependencies examined experimentally, showing improved bandwidth flatness via multiple dispersive wave generation dispersion-assisted Raman shifts while maintaining excellent pulse-to-pulse stability coherence simulations, suggesting relevance our findings basic science as well sources.