The IFSW was able to demonstrate the first promising results within its activities in the field of hollow-core fibers. Hollow-core fibers represent the only presently known solution for the flexible delivery of ultrashort laser pulses with high energy and high peak power.
A hollow-core photonic crystal fiber based on "inhibited-coupling" was manufactured completely at the IFSW. The produced fiber has a tubular structure consisting of eight capillaries in its cladding, a core diameter of 40 µm, and a length of several hundred meters. The losses amount to approximately 50 dB/km within a wavelength range of 900 to 1100 nm, making these fibers suitable for the delivery of high-brightness laser beams emitted from common high-power solid-state lasers.