Browsing by Author "Loescher, André"

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    Experimental analysis on CPA-free thin-disk multipass amplifiers operated in a helium-rich atmosphere
    (2022) Bienert, Florian; Loescher, André; Röcker, Christoph; Graf, Thomas; Abou Ahmed, Marwan
    Es wird der Einfluss von Helium als atmosphärisches Gas in Scheibenlaser-multipass-Ultrakurzpulsverstärkern untersucht.
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    Process limits for percussion drilling of stainless steel with ultrashort laser pulses at high average powers
    (2022) Brinkmeier, David; Holder, Daniel; Loescher, André; Röcker, Christoph; Förster, Daniel J.; Onuseit, Volkher; Weber, Rudolf; Abdou Ahmed, Marwan; Graf, Thomas
    The availability of commercial ultrafast lasers reaching into the kW power level offers promising potential for high-volume manufacturing applications. Exploiting the available average power is challenging due to process limits imposed by particle shielding, ambient atmosphere breakdown, and heat accumulation effects. We experimentally confirm the validity of a simple thermal model, which can be used for the estimation of a critical heat accumulation threshold for percussion drilling of AISI 304 steel. The limits are summarized in a processing map, which provides selection criteria for process parameters and suitable lasers. The results emphasize the need for process parallelization.