Amazing stuff!
"In brief
- Researchers developed a method to indirectly measure the duration of X-ray pulses created by SLAC’s Linac Coherent Light Source.
- The pulses lasted only 100 to 400 attoseconds, making them the shortest high-energy X-ray pulses ever recorded at an X-ray free-electron laser.
- The pulses can be used by scientists to capture the real-time motion of electrons in dense systems like plasmas and the inner orbitals of atoms.
..."
From the abstract:
"We present the experimental confirmation of attosecond pulse generation in the hard X-ray regime with a free-electron laser.
Our experiment is based on the measurements of a nonlinear optical phenomenon known as amplified spontaneous emission from 3d transition metals.
By analysing the yield of the collective X-ray fluorescence induced by ultrashort pulses at the Linac Coherent Light Source, we identify the generation of attosecond pulses and shot-to-shot fluctuations in their duration, ranging from 100 as to 400 as. The inferred time–bandwidth product for 100-as pulses is approximately 2 fs eV, indicating that a fraction of the pulses is nearly transform-limited pulses.
Our results confirm the generation of attosecond hard X-ray pulses that can be used to simultaneously probe matter on the timescales of electronic phenomena and with atomic spatial resolution.
Furthermore, attosecond hard X-ray pulses can outrun the fastest radiation damage processes, paving the way to single-shot damage-free X-ray measurements."
Experimental demonstration of attosecond hard X-ray pulses (no public access)
Experimental demonstration of attosecond hard X-ray pulses (preprint, open access, however this preprint dates back to June 2025)
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