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

Martin Gebhardt; Tobias Heuermann; Robert Klas; Alexander Kirsche; Chang Liu; Ziyao Wang; Mathias Lenski; Christian Gaida; Cesar Jauregui; Jose Antonio-Lopez; Axel Schülzgen; Rodrigo Amezcua-Correa; Jan Rothhardt; Jens Limpert

doi:10.1117/12.2578529

5 March 2021 High repetition rate high-order harmonic generation up to the carbon K-edge in an antiresonant hollow-core fiber

Martin Gebhardt, Tobias Heuermann, Robert Klas, Alexander Kirsche, Chang Liu, Ziyao Wang, Mathias Lenski, Christian Gaida, Cesar Jauregui, Jose Antonio-Lopez, Axel Schülzgen, Rodrigo Amezcua-Correa, Jan Rothhardt, Jens Limpert

Author Affiliations +

Proceedings Volume 11676, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI; 116761D (2021) https://doi.org/10.1117/12.2578529
Event: SPIE LASE, 2021, Online Only

Abstract

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 >10⁶ ph/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.

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Martin Gebhardt, Tobias Heuermann, Robert Klas, Alexander Kirsche, Chang Liu, Ziyao Wang, Mathias Lenski, Christian Gaida, Cesar Jauregui, Jose Antonio-Lopez, Axel Schülzgen, Rodrigo Amezcua-Correa, Jan Rothhardt, and Jens Limpert "High repetition rate high-order harmonic generation up to the carbon K-edge in an antiresonant hollow-core fiber", Proc. SPIE 11676, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI, 116761D (5 March 2021); https://doi.org/10.1117/12.2578529

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