Innovative Systemkomponenten für die Faserlasertechnologie (English shop)

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The elimination of complex and expensive optics for shaping the strongly asymmetric pump radiation of laser diodes is a central research topic in the field of fibre laser technologies. With this aspect in mind, the present work developed and investigated an innovative concept of pump light delivery based on an arrangement of parallel fused silica ridge waveguides. The targeted use of the directional coupling effect of pump mode fields within the passive ridge waveguides and the laser-active glass fibre ensures optical excitation of the glass fibre beyond the length of the passive structures. The concept has a modular design and allows power scaling of the fibre laser by increasing the number of individual ridge waveguide modules. In order to enhance the resistance of optical system components, such as the glass fibre end face, to high optical powers, a technology for producing dirt-repellent glass surfaces was additionally developed. Based on a plasma etching process, a specific nanostructure was formed on the glass in a self-organising manner. The treated surfaces exhibited hydrophobicity and oleophobicity, excellent particle repellency, as well as increased spectrally broadband transmission.