High efficiency ultrafast water-window harmonic generation for single-shot soft X-ray spectroscopy
Autor: | Pengfei Lan, Kotaro Nishimura, Katsumi Midorikawa, Renzhi Shao, Yuxi Fu, Eiji J. Takahashi, Akira Suda |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Materials science
Attosecond Astrophysics::High Energy Astrophysical Phenomena General Physics and Astronomy lcsh:Astrophysics 02 engineering and technology 01 natural sciences law.invention Optics law 0103 physical sciences lcsh:QB460-466 High harmonic generation 010306 general physics Absorption (electromagnetic radiation) Water window business.industry Energy conversion efficiency 021001 nanoscience & nanotechnology Laser lcsh:QC1-999 Femtosecond 0210 nano-technology business Ultrashort pulse lcsh:Physics |
Zdroj: | Communications Physics, Vol 3, Iss 1, Pp 1-10 (2020) |
ISSN: | 2399-3650 |
Popis: | Fully coherent, soft X-ray attosecond pulses are now available through high-order harmonic generation (HHG); however, the output energy is insufficient for various applications, such as attosecond-scale soft X-ray nonlinear experiments, the seeding of soft X-ray free-electron lasers, attosecond-pump-attosecond-probe spectroscopies, and single-shot imaging. In this paper, we combine a newly developed TW class mid-infrared femtosecond laser and a loose focusing geometry for HHG. A soft X-ray harmonic beam up to the water window region is demonstrated, which is more than 100 times intense compared to previous works. We achieve a high conversion efficiency, low beam divergence and a significantly reduced medium gas pressure. As the first application, we demonstrate near edge X-ray absorption fine structure experiments with clear fine absorption spectra near the K- and L-edges observed. The robust energy scaling method on HHG opens the door for demonstrating single-shot absorption spectrum and live-cell imaging with a femtosecond time resolution. While high harmonic x-ray sources are well established sources for ultrafast spectroscopy, the decrease in efficiency towards higher energies limits their application. Here, a loose-focused, TW mid-IR laser is used to generate high harmonic soft x-rays with pulse energies of a few nJ in the water window and easy energy scaling. |
Databáze: | OpenAIRE |
Externí odkaz: | |
Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |