They can support kilowatt levels of continuous output power because of the fiber's high surface area to volume ratio, which allows efficient cooling. The fiber's waveguide properties reduce or eliminate thermal distortion of the optical path, typically producing a diffraction-limited, high-quality optical beam.
The fiber's high surface area to volume ratio enables it to efficiently dissipate heat, leading to kilowatt-level continuous output power support. The fiber's waveguide properties minimize thermal distortion of the optical path, typically resulting in a diffraction-limited, high-quality optical beam.