Mainz 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
SYLX: Symposium Laser Driven X-Rays: Generation and Application
SYLX 1: Symposium Laser Driven X-Rays: Generation and Application
SYLX 1.3: Invited Talk
Friday, March 6, 2026, 15:30–16:00, RW 1
Near-relativistic ytterbium fiberlaser plasma source for high-flux hard X-ray generation from a liquid-metal jet — •Robert Klas1,2, Maximilian Benner2, Mohammed Almassarani2, Maximilian Karst2,3, Lucas Eisenbach1,2,3, Philipp Gierschke1,2, Warunya Röder1,2, Arno Klenke1,2,3, Jan Rothhardt1,2,3, and Jens Limpert1,2,3 — 1Fraunhofer, Germany — 2Friedrich Schiller University Jena, Germany — 3Helmholtz-Institute Jena, Germany
We demonstrate a compact, high-flux hard-X-ray source driven by a Ytterbium fiber laser tightly focused onto a flowing liquid-metal jet target composed of In- and Bi-based alloys, operating in the near-relativistic regime. Using ultrashort pulses from a high-average-power fiber system, we reach intensities corresponding to a 3E17 to 1.5E18 W/cm^2 at 1030 nm wavelelength, enabling sub-cycle electron acceleration and re-injection into the dense liquid to generate high-flux In Kα (~24.2 keV) and Bi Lα (~10.8 keV) emission superimposed on a broadband bremsstrahlung continuum. The fiber-laser platform provides a high stability, excellent beam quality, and multi-kHz repetition rates, while the liquid jet offers a continuously refreshed interaction surface with manageable debris operation. We report (i) X-ray spectrum with element-specific Kα/Lα peaks with tunability through the jet composition, (ii) absolute flux scaling with repetition rate and intensity, and (iii) the emission spot size. These results are enabling practical, laboratory-scale ultrafast X-ray spectroscopy and diffraction.
Keywords: High average power lasers; Nonlinear Pulse Compression; X-ray generation