تقرير
Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials
| العنوان: | Non-linear self-driven spectral tuning of Extreme Ultraviolet Femtosecond Pulses in monoatomic materials |
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| المؤلفون: | Ferrante, Carino, Principi, Emiliano, Marini, Andrea, Batignani, Giovanni, Fumero, Giuseppe, Virga, Alessandra, Foglia, Laura, Mincigrucci, Riccardo, Simoncig, Alberto, Spezzani, Carlo, Masciovecchio, Claudio, Scopigno, Tullio |
| سنة النشر: | 2021 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Optics |
| الوصف: | 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. Comment: 20 pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s41377-021-00531-8 |
| الوصول الحر: | http://arxiv.org/abs/2104.09385Test |
| رقم الانضمام: | edsarx.2104.09385 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/s41377-021-00531-8 |
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