Abstract
Femtosecond Direct Laser Writing (fs-DLW) is a powerful technique of fabricating 3D photonic microstructures in transparent dielectric materials doped with rare-earth ions for waveguide (WG) laser applications [1]. It benefits from high precision of inscriptions, short fabrication times, and a variety of available WG geometries. Laser waveguides based on thulium ions (Tm3+) with emission around 2 µm (the 3F4 → 3H6 transition) are appealing as seed sources for WG and fiber amplifiers for medical and sensing applications. Calcium fluoride (CaF2) is an attractive host matrix for rare-earth doping because of its high thermal conductivity and strong ion clustering leading to broadband (“glassylike”) emission properties. In the present work, we report on the first Tm3+:CaF2 waveguide laser.
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