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Wanie, Vincent [Author]; Barbato, Pasquale [Author]; Hahne, Josina [Author]; Ryabchuk, Sergey [Author]; Wahid, Ammar Bin [Author]; Amorim, David [Author]; Månsson, Erik P. [Author]; Trabattoni, Andrea [Author]; Osellame, Roberto [Author]; Martínez Vázquez, Rebeca [Author]; Calegari, Francesca [Author]

Ultraviolet supercontinuum generation using a differentially-pumped integrated glass chip - [published Version]

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  • Media type: E-Article; Text
  • Title: Ultraviolet supercontinuum generation using a differentially-pumped integrated glass chip
  • Contributor: Wanie, Vincent [Author]; Barbato, Pasquale [Author]; Hahne, Josina [Author]; Ryabchuk, Sergey [Author]; Wahid, Ammar Bin [Author]; Amorim, David [Author]; Månsson, Erik P. [Author]; Trabattoni, Andrea [Author]; Osellame, Roberto [Author]; Martínez Vázquez, Rebeca [Author]; Calegari, Francesca [Author]
  • imprint: Bristol : IOP Publishing, 2024
  • Published in: JPhys Photonics (Journal of Physics: Photonics) 6 (2024), Nr. 2 ; JPhys Photonics (Journal of Physics: Photonics)
  • Issue: published Version
  • Language: English
  • DOI: https://doi.org/10.15488/17067; https://doi.org/10.1088/2515-7647/ad2bd3
  • Keywords: femtosecond laser micromachining ; ultrafast optics ; ultraviolet radiation ; frequency conversion ; differential pumping ; ultrafast UV spectroscopy ; third-harmonic generation
  • Origination:
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  • Description: We investigate the generation of ultrabroadband femtosecond ultraviolet (UV) radiation via third-order harmonic generation in highly confined gas media. A dual-stage differential-pumping scheme integrated into a glass microfluidic chip provides an exceptional gas confinement up to several bar and allows the apparatus to be operated under high-vacuum environment. UV pulses are generated both in argon and neon with up to ∼0.8 μJ energy and 0.2% conversion efficiency for spectra that cover the UVB and UVC regions between 200 and 325 nm. Numerical simulations based on the unidirectional pulse propagation equation reveal that ionization plays a critical role for extending the spectral bandwidth of the generated third-harmonic pulse beyond the tripled 800 nm driving laser pulse bandwidth. By delivering UV supercontinua supporting Fourier transform limits below 2 fs, as well as comparable pulse energies with respect to capillary-based techniques that typically provide high spectral tunability but produce narrower bandwidths, our compact device makes a step forward towards the production and application of sub-fs UV pulses for the investigation of electron dynamics in neutral molecules.
  • Access State: Open Access