Self-action nonlinearity is a key aspect – either as a foundational element or a detrimental factor – of several optical spectroscopies and photonic devices. Supercontinuum generation, wavelength converters, and chirped pulse amplification are just a few examples. The recent advent of Free Electron Lasers (FEL) fostered building on nonlinearity to propose new concepts and extend optical wavelengths paradigms for extreme ultraviolet (EUV) and X-ray regimes. No evidence for intrapulse dynamics, however, has been reported at such short wavelengths, where the light-matter interactions are ruled by the sharp absorption edges of core electrons. Here, we provide experimental evidence for self-phase modulation of femtosecond FEL pulses, which we exploit for fine self-driven spectral tunability by interaction with sub-micrometric foils of selected monoatomic materials. Moving the pulse wavelength across the absorption edge, the spectral profile changes from a non-linear spectral blue-shift to a red-shifted broadening. These findings are rationalized accounting for ultrafast ionization and delayed thermal response of highly excited electrons above and below threshold, respectively. [Figure not available: see fulltext.]

Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials / Ferrante, C.; Principi, E.; Marini, A.; Batignani, G.; Fumero, G.; Virga, A.; Foglia, L.; Mincigrucci, R.; Simoncig, A.; Spezzani, C.; Masciovecchio, C.; Scopigno, T.. - In: LIGHT, SCIENCE & APPLICATIONS. - ISSN 2047-7538. - 10:1(2021), p. 92. [10.1038/s41377-021-00531-8]

Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials

Ferrante C.;Principi E.;Marini A.;Batignani G.;Fumero G.;Virga A.;Foglia L.;Scopigno T.
2021

Abstract

Self-action nonlinearity is a key aspect – either as a foundational element or a detrimental factor – of several optical spectroscopies and photonic devices. Supercontinuum generation, wavelength converters, and chirped pulse amplification are just a few examples. The recent advent of Free Electron Lasers (FEL) fostered building on nonlinearity to propose new concepts and extend optical wavelengths paradigms for extreme ultraviolet (EUV) and X-ray regimes. No evidence for intrapulse dynamics, however, has been reported at such short wavelengths, where the light-matter interactions are ruled by the sharp absorption edges of core electrons. Here, we provide experimental evidence for self-phase modulation of femtosecond FEL pulses, which we exploit for fine self-driven spectral tunability by interaction with sub-micrometric foils of selected monoatomic materials. Moving the pulse wavelength across the absorption edge, the spectral profile changes from a non-linear spectral blue-shift to a red-shifted broadening. These findings are rationalized accounting for ultrafast ionization and delayed thermal response of highly excited electrons above and below threshold, respectively. [Figure not available: see fulltext.]
non-linear optics, free electron laser
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Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials / Ferrante, C.; Principi, E.; Marini, A.; Batignani, G.; Fumero, G.; Virga, A.; Foglia, L.; Mincigrucci, R.; Simoncig, A.; Spezzani, C.; Masciovecchio, C.; Scopigno, T.. - In: LIGHT, SCIENCE & APPLICATIONS. - ISSN 2047-7538. - 10:1(2021), p. 92. [10.1038/s41377-021-00531-8]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1556384
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