Three-dimensional laser creation of a Near-IR laser-gain medium based on hydride donor/acceptor complexes made of coupled laser-induced silver nanoclusters with ytterbium ions
Résumé
Femtosecond laser inscription in a ytterbium-doped silver-containing phosphate glass is demonstrated by achieving 3D highly localized laser-induced silver photochemistry. The produced fluorescent silver nanoclusters lead to high optical contrast in the visible range, showing that the coinsertion of Yb3+ ions is not detrimental to the silver-based photochemistry. We demonstrate efficient energy transfer from these silver nanoclusters to the rare-earth Yb3+ ions, leading to near-IR background-free fluorescence emission. Indeed, we demonstrate the 3D-localized near-IR emission of homogeneously distributed Yb3+ ions thanks to their spatially selective excitation by colocalized silver nanoclusters. This creation of hybrid donor/acceptor systems, composed of coupled laser-inscribed silver nanoclusters and Yb3+ ions, respectively, allows for the 3D-distribubed creation of a laser-active gain medium. The reported effective laser gain results from the silver nanocluster-mediated excitation of the Yb3+ lasing ions, demonstrating the energy-transfer-based achievement of inversion population and optically induced transparency of the material. This opens the route for the all-optical fabrication of near-IR micron-scale multiscale architectures compatible with the development of new laser-active media especially for integrated waveguides and active photonic integrated circuits. This includes perspectives of versatile 3D laser-integrated architectures allowing for evanescent coupling under lasing operation with their environment, to achieve enhanced photonic sensing abilities beyond those offered by usual conventional planar of unidirectional architectures.
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AlassaniF_ACSApplMaterInterf_2025_license.pdf (1.65 Mo)
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AlassaniF_ACSApplMaterInterf_SI_2025.pdf (818.11 Ko)
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