Attosecond Inner-Shell Lasing at Angstrom Wavelengths

Linker, Thomas M.; Yamada, Jumpei; Guetg, Marc W.; Fransson, Thomas; Bergmann, Uwe; Pellegrini, Claudio; Halavanau, Aliaksei; Lutman, Alberto A.; Boutet, Sebastien; Osaka, Taito; Hara, Toru; Benediktovitch, Andrei; Rohringer, Nina; Marinelli, Agostino; Ronchetti, Daniele; Abhari, Zain; Yano, Junko; Kern, Jan; Weninger, Clemens; Michine, Yurina; Fuller, Franklin D.; Yoneda, Hitoki; Yamaguchi, Gota; Sayed, Farheen N.; Ajayan, Pulickel M.; Inoue, Ichiro; Zhang, Yu; Inubushi, Yuichi; Aquila, Andy; Babu, Ganguli; Yachandra, Vittal K.; Chuchurka, Stasis; Yabashi, Makina; Salpekar, Devashish; Kroll, Thomas; Alonso-Mori, Roberto; Kling, Matthias F.

Preprint

PUBDB-2025-02225

Attosecond Inner-Shell Lasing at Angstrom Wavelengths

Linker, T. M. (Corresponding author)Extern*XFEL.EU* ; Halavanau, A. ; Kroll, T. ; Benediktovitch, A. ; Zhang, Y. ; Michine, Y. ; Chuchurka, S.Extern*DESY* ; Abhari, Z. ; Ronchetti, D.Extern*DESY* ; Fransson, T. ; Weninger, C. ; Fuller, F. D. ; Aquila, A. ; Alonso-Mori, R. ; Boutet, S. ; Guetg, M. W. ; Marinelli, A. ; Lutman, A. A. ; Yabashi, M. ; Inoue, I. ; Osaka, T. ; Yamada, J. ; Inubushi, Y. ; Yamaguchi, G. ; Hara, T. ; Babu, G. ; Salpekar, D. ; Sayed, F. N. ; Ajayan, P. M. ; Kern, J. ; Yano, J. ; Yachandra, V. K. ; Kling, M. F. ; Pellegrini, C. ; Yoneda, H. ; Rohringer, N. ; Bergmann, U. (Corresponding author)Extern*XFEL.EU*

2025

[10.3204/PUBDB-2025-02225]

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Report No.: arXiv:2409.06914

Abstract: Since the invention of the laser nonlinear effects such as filamentation, Rabi-cycling and collective emission have been explored in the optical regime leading to a wide range of scientific and industrial applications. X-ray free electron lasers (XFELs) have led to the extension of many optical techniques to X-rays for their advantages of angstrom scale spatial resolution and elemental specificity. One such example is XFEL driven population inversion of 1s core hole states resulting in inner-shell K$α$ (2p to 1s) X-ray lasing in elements ranging from neon to copper, which has been utilized for nonlinear spectroscopy and development of next generation X-ray laser sources. Here we show that strong lasing effects, similar to those observed in the optical regime, can occur at 1.5 to 2.1 angstrom wavelengths during high intensity (> ${10^{19}}$ W/cm${^{2}}$) XFEL driven inner-shell lasing and superfluorescence of copper and manganese. Depending on the temporal substructure of the XFEL pump pulses(containing ${~10^{6}}$ - ${10^{8}}$ photons) i, the resulting inner-shell X-ray laser pulses can exhibit strong spatial inhomogeneities as well as spectral splitting, inhomogeneities and broadening. Through 3D Maxwell Bloch theory we show that the observed spatial inhomogeneities result from X-ray filamentation, and that the spectral splitting and broadening is driven by Rabi cycling with sub-femtosecond periods. Our simulations indicate that these X-ray pulses can have pulse lengths of less than 100 attoseconds and coherence properties that open the door for quantum X-ray optics applications.

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