Designs of Large Mode Area Solid-Core Photonic Bandgap Fibers for High Power Applications

Solid-Core Photonic BandGap Fibers (SC-PBGF) are interesting candidates for high power delivery and laser/amplifier fiber applications due to their specific guiding properties. For example, mode diameters as large as 36 μm can be obtained in a flexible Yb3+ -doped SC-PBGF with bending radius as small as 10 cm. In addition to specific fiber designs, large diameter pure-silica Yb3+ -doped monoliths are used as raw material for the active core, enabling a reduced refractive index increase as compared to silica. Recent advances will be discussed during this talk.