IdealPhotonics' double-clad fiber is a special type of fiber with a dual concentric waveguide structure. It efficiently absorbs multimode pump light through a large-size, high numerical aperture (NA) inner cladding, while simultaneously achieving high-brightness laser output in a single-mode core, making it a core component of high-power fiber lasers.The "dual-waveguide synergistic effect" efficiently captures multimode pump energy through the inner cladding (large size/high NA), while the core (single-mode) achieves high-brightness laser output. With a pump conversion efficiency >80%, it becomes the core carrier for 10,000-watt fiber lasers.