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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 7: Laser-Beam Matter Interaction - Laser Applications II
K 7.6: Vortrag
Donnerstag, 17. März 2022, 15:15–15:30, K-H4
X-ray dose rate and spectral measurements generated from ultrafast laser machining and research-grade laser systems — •Philip Mosel1, Pranitha Sankar1, Jan Düsing2, Elisa Appi1, Günter Dittmar3, Uwe Morgner1, and Milutin Kovacev1 — 1Institute of Quantum Optics, Cluster of Excellence PhoenixD and Quantum Frontiers, Leibniz Universität Hannover, Hannover, 30167 — 2Laser Zentrum Hannover e. V., Hannover, 30419 — 3Engineering office Prof. Dr.-Ing. Günter Dittmar, Aalen, 73433
In ultrashort pulsed laser machining, process speeds are increased by scaling the average power and pulse repetition rate, which can lead to potentially dangerous X-ray emission [1]. We present measurements with a novel calibrated X-ray detector in the detection range from 2 keV to 20 keV and show the dependence of X-ray dose rate and spectral emission of commonly used metals, alloys, and ceramics for ultrafast laser processing [2]. Our studies include the dependence of dose rate on various laser parameters available in ultrafast laboratories as well as on industrial laser systems. The results presented show that focused sub-picosecond pulses with intensity above 1013 W/cm2 can exceed the annual irradiation limit even in just one hour, requiring adequate shielding for the safety of researchers.
[1] Legall, Herbert, et al., Applied Physics A 125.8 (2019): 1-8.
[2] Mosel, Philip, et al., Materials 14.16 (2021): 4397.