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High repetition rate high-order harmonic generation up to the carbon K-edge in an antiresonant hollow-core fiber

: Gebhardt, M.; Heuermann, T.; Klas, R.; Kirsche, A.; Liu, C.; Wang, Z.; Lenski, M.; Gaida, C.; Jauregui, C.; Antonio-Lopez, J.; Schülzgen, A.; Amezcua-Correa, R.; Rothhardt, J.; Limpert, J.


Herman, P.R. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI : 6-11 March 2021, Online Only, United States
Bellingham, WA: SPIE, 2021 (Proceedings of SPIE 11676)
ISBN: 978-1-5106-4187-7
ISBN: 978-1-5106-4188-4
Paper 116761D, 6 pp.
Conference "Frontiers in Ultrafast Optics - Biomedical, Scientific, and Industrial Applications" <21, 2021, Online>
Conference Paper
Fraunhofer IOF ()
high harmonic generation; hollow-core fiber; soft X-ray

Intense, ultrafast laser sources with an operation wavelength beyond the well-established near-IR are valuable tools for exploiting the wavelength scaling laws of strong-field, light-matter interactions. Such laser systems enable the scaling of the phase matching photon energy cut-off in high-order harmonic generation, which allows for the generation of coherent soft X-ray radiation up to, and even beyond, the water window. Such laser-driven sources enable a plethora of subsequent applications. A number of these applications can significantly benefit from an increase in repetition rate. In that regard, ultrafast thulium-doped fiber laser systems (providing a broad amplification bandwidth in the 2 μm wavelength region) represent a promising, average-power scalable laser concept for driving high-order harmonic generation. These lasers are capable of delivering ∼100 fs pulses with multi-GW peak power at hundreds of kHz repetition rate. In this work, we show that combining ultrafast thulium-doped fiber CPA systems with HHG in an antiresonant hollow-core fiber is a promising approach to realize high photon energy cut-off HHG from a compact setup. The realization is based on combining nonlinear pulse self-compression (leading to strong-field waveforms) and phase-matched high-order harmonic generation in a single antiresonant hollow-core fiber. In this demonstration, a photon energy cut-off of approximately 330 eV has been achieved, together with a photon flux >106ph/s/eV at 300 eV. These results emphasize the great potential of exploiting the HHG wavelength scaling laws with 2 μm fiber laser technology. Improvements of the HHG efficiency, the overall HHG yield and further laser performance enhancements will be the subjects of our future work.