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Proceedings Paper

Soft x-ray high order harmonic generation driven by high repetition rate ultrafast thulium-doped fiber lasers
Author(s): Martin Gebhardt; Tobias Heuermann; Ziyao Wang; Mathias Lenski; Christian Gaida; Robert Klas; Alexander Kirsche; Steffen Hädrich; Jan Rothhardt; Jens Limpert
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Paper Abstract

Intense, ultrafast laser sources with an emission wavelength beyond the well-established near-IR are important tools for exploiting the wavelength scaling laws of strong-field, light-matter interactions. In particular, such laser systems enable high photon energy cut-off HHG up to, and even beyond, the water window thus enabling a plethora of subsequent experiments. 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 in this regard. These lasers already deliver ~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 hollow-core fiber based nonlinear pulse compression is a promising approach to realize high photon energy cut-off HHG drivers. Herein, we show that thulium-doped, fiber-laser-driven HHG in argon can access the highly interesting spectral region around 90 eV. Additionally, we show the first water window high-order harmonic generation experiment driven by a high repetition rate, thulium-doped fiber laser system. In this proof of principle demonstration, a photon energy cut-off of approximately 400 eV has been achieved, together with a photon flux <105 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 subject of our future work.

Paper Details

Date Published: 21 February 2020
PDF: 6 pages
Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 112600U (21 February 2020); doi: 10.1117/12.2546151
Show Author Affiliations
Martin Gebhardt, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Tobias Heuermann, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Ziyao Wang, Friedrich-Schiller-Univ. Jena (Germany)
Mathias Lenski, Friedrich-Schiller-Univ. Jena (Germany)
Christian Gaida, Friedrich-Schiller-Univ. Jena (Germany)
Active Fiber Systems GmbH (Germany)
Robert Klas, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Alexander Kirsche, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Steffen Hädrich, Friedrich-Schiller-Univ. Jena (Germany)
Active Fiber Systems GmbH (Germany)
Jan Rothhardt, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Jens Limpert, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF (Germany)


Published in SPIE Proceedings Vol. 11260:
Fiber Lasers XVII: Technology and Systems
Liang Dong, Editor(s)

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