Soft x-ray high order harmonic generation driven by high repetition rate ultrafast thulium-doped fiber lasers
Gebhardt M, Heuermann T, Wang Z, Lenski M, Gaida C, Klas R, Kirsche A, Haedrich S, Rothhardt J, Limpert J (2020)
Publication Type: Conference contribution
Publication year: 2020
Journal
Publisher: SPIE
Book Volume: 11260
Conference Proceedings Title: Proceedings of SPIE - The International Society for Optical Engineering
Event location: San Francisco, CA, USA
ISBN: 9781510632837
DOI: 10.1117/12.2546151
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.
Involved external institutions
Germany (DE)How to cite
APA:
Gebhardt, M., Heuermann, T., Wang, Z., Lenski, M., Gaida, C., Klas, R.,... Limpert, J. (2020). Soft x-ray high order harmonic generation driven by high repetition rate ultrafast thulium-doped fiber lasers. In Liang Dong (Eds.), Proceedings of SPIE - The International Society for Optical Engineering. San Francisco, CA, USA: SPIE.
MLA:
Gebhardt, Martin, et al. "Soft x-ray high order harmonic generation driven by high repetition rate ultrafast thulium-doped fiber lasers." Proceedings of the Fiber Lasers XVII: Technology and Systems 2020, San Francisco, CA, USA Ed. Liang Dong, SPIE, 2020.
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