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| Schematics of pure-quartic solitons: (L) Fourth-order dispersion (FOD) gives rise to temporal pulse broadening (blue output pulse v. black input pulse in time) without affecting the spectrum; (center) self-phase modulation (SPM) generates spectral broadening (red output pulse v. black input pulse in frequency) without affecting the temporal pulse shape; (R) the interplay of FOD and SPM can give rise to pure-quartic solitons which remain nearly unperturbed (green output pulses versus black input pulses in both frequency and time). Credit: Nature Communications / CUDOS. |
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