TY - CONF A1 - Krüger, Jörg T1 - X-ray emission during ultrashort pulse laser material processing N2 - The unwanted emission of X-rays during ultrashort pulse laser material processing in air was already reported more than 20 years ago for pulse repetition rates in the 1 kHz range [1]. It was stated that an enclosure of the experimental setup is necessary to protect the operator from X-rays. By now, the use of ultrashort pulse laser technology has become established in industry using repetition rates in the multi 100 kHz up to the GHz range and laser average powers up to the kW level. Since 2018/2019, more and more investigations have been carried out on the hazards from X-rays at higher laser pulse repetition rates [2-4]. Recently, maximum X-ray skin dose rates of the order of 1 Sv/h (iron target [5]) and X-ray photon energies of up to 40 keV (tungsten target [6]) were reported. Measures must be taken to shield the unwanted X-rays. T2 - 10th Conference on Applications of Femtosecond Lasers in Materials Science (FemtoMat) CY - Mauterndorf, Austria DA - 24.02.2025 KW - Ultrashort pulse laser KW - Material processing KW - X-ray emission KW - Radiation protection PY - 2025 AN - OPUS4-62665 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -