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Polarisation control for the generation of Laser Induced Periodic Surface Structures upon femtosecond laser processing

  • This thesis investigated the generation of laser induced periodic surface structures (LIPSS) using femtosecond laser irradiation at a central wavelength of 775 nm. The metals stainless steel and copper as well as a semiconducting thin film, ITO on glass substrate were investigated. The impact of the processing parameters was studied for single and multiple pulse irradiation to determine the ablation threshold of the materials and the different types of LIPSS. These observations allowed the optimisation of area structuring with regards to processing speed and LIPSS quality. The feasibility of the LIPSS generation in dynamic, real time polarisation control was then explored. By using a fast response, liquid-crystal polarisation rotation device, the direction of the linear polarisation of the laser beam could be dynamically controlled and synchronised to the scanning during laser processing. As a result, a range of complex micro- and nano-scale patterns with orthogonal direction of LIPSS were created. The samples were analysed using optical and electron microscopy. The orientation of the LIPSS was determined also from detection of light diffracted by the LIPSS. Finally, two applications of large area LIPSS patterning were demonstrated, information encoding on metals and periodic structuring of a thin film conducting oxide for solar cells.

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Author:Linda Pabst
Document Type:Master's Thesis
Year of Completion:2015
Granting Institution:Hochschule Mittweida
Release Date:2018/01/08
GND Keyword:Femtosekundenlaser
Institutes:03 Mathematik / Naturwissenschaften / Informatik
DDC classes:621.366 Laser, Lasertechnologie
Open Access:Innerhalb der Hochschule
Licence (German):License LogoUrheberrechtlich gesch├╝tzt