title: Femtosecond laser-induced surface structures on carbon fibers.
abstract: The influence of different polarization states during the generation of periodic nanostructures on the surface of carbon fibers was investigated using a femtosecond laser with a pulse duration τ=300  fs, a wavelength λ=1025  nm, and a peak fluence F=4  J/cm². It was shown that linear polarization results in a well-aligned periodic pattern with different orders of magnitude concerning their period and an alignment parallel and perpendicular to fiber direction, respectively. For circular polarization, both types of uniform laser-induced periodic surface structures (LIPSS) patterns appear simultaneously with different dominance in dependence on the position at the fiber surface. Their orientation was explained by the polarization-dependent absorptivity and the geometrical anisotropy of the carbon fibers.
authors.forename: Roman
authors.initials: R
authors.lastname: Sajzew
authors.forename: Jan
authors.initials: J
authors.lastname: Schröder
authors.forename: Clemens
authors.initials: C
authors.lastname: Kunz
authors.forename: Sebastian
authors.initials: S
authors.lastname: Engel
authors.forename: Frank A
authors.initials: FA
authors.lastname: Müller
authors.forename: Stephan
authors.initials: S
authors.lastname: Gräf