A diffractive axicon (a device that diffracts the input light pulse radially) enables complex correlations between the topological charges and the frequencies of ultrashort laser pulses, resulting in a variety of ultrashort coiled light structures.
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Jolly, S.W. Ultrashort coils of light. Nat. Photon. 17, 743–744 (2023). https://doi.org/10.1038/s41566-023-01269-y