High-order harmonics in the extreme-ultraviolet regime can be produced and a stable waveform-locked attosecond pulse can be formed when quartz is excited by a strong short-pulsed laser, providing a robust path towards attosecond photonics.
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Ghimire, S. Locking the waveform with a quartz crystal. Nature Photon 12, 256–257 (2018). https://doi.org/10.1038/s41566-018-0161-0
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DOI: https://doi.org/10.1038/s41566-018-0161-0
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