Attosecond inner-shell lasing at ångström wavelengths

Nature, Published online: 11 June 2025; doi:10.1038/s41586-025-09105-9

Strong lasing effects similar to those in the optical regime can occur at 1.5–2.1 Å wavelengths during high-intensity XFEL-driven Kα1 lasing of copper and manganese.

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