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• W2079398478 abstract "While the standard scenario of third-harmonic generation (THG) by a dispersive-wave pump involves the emission of light with a frequency $3ensuremath{omega}$, thrice the frequency $ensuremath{omega}$ of the input pump field, solitons undergoing a continuous shift of their central frequency $ensuremath{omega}$ due to the Raman effect in a multimode optical fiber can generate the third harmonic in a different fashion. In the experiments reported here, we provide the first direct experimental evidence of THG by a continuously red-shifting soliton pump by studying the third-harmonic buildup in relation to the spectral evolution of the soliton pump field in a silica photonic-crystal fiber (PCF). We show that solitons excited in a PCF by unamplified femtosecond pulses of a Cr:forsterite laser sweep through the spectral range from $1.25phantom{rule{0.3em}{0ex}}text{to}phantom{rule{0.3em}{0ex}}1.63phantom{rule{0.3em}{0ex}}ensuremath{mu}mathrm{m}$, scanning through a manifold of THG phase-matching resonances with $3ensuremath{omega}$ dispersive waves in PCF modes. As a result, intense third-harmonic peaks build up in the range of wavelengths from $370phantom{rule{0.3em}{0ex}}text{to}phantom{rule{0.3em}{0ex}}550phantom{rule{0.3em}{0ex}}mathrm{nm}$ at the output of the fiber, making PCF a convenient fiber-format multifrequency source of short-wavelength radiation. Time-resolved fluorescence measurements with photoexcitation provided by the third-harmonic PCF output are presented, demonstrating the high potential of PCF sources for an ultrafast photoexcitation of fluorescent molecular systems in physics, chemistry, and biology." @default.
• W2079398478 created "2016-06-24" @default.
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• W2079398478 date "2007-01-25" @default.
• W2079398478 modified "2023-10-17" @default.
• W2079398478 title "Multifrequency third-harmonic generation by red-shifting solitons in a multimode photonic-crystal fiber" @default.
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• W2079398478 doi "https://doi.org/10.1103/physreve.75.016614" @default.
• W2079398478 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17358282" @default.
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