Details
| Original language | English |
|---|---|
| Article number | 025005 |
| Number of pages | 13 |
| Journal | JPhys Photonics |
| Volume | 6 |
| Issue number | 2 |
| Publication status | Published - 7 Mar 2024 |
Abstract
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.
Keywords
- differential pumping, femtosecond laser micromachining, frequency conversion, third-harmonic generation, ultrafast optics, ultrafast UV spectroscopy, ultraviolet radiation
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Engineering(all)
- Electrical and Electronic Engineering
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In: JPhys Photonics, Vol. 6, No. 2, 025005, 07.03.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Ultraviolet supercontinuum generation using a differentially-pumped integrated glass chip
AU - Wanie, Vincent
AU - Barbato, Pasquale
AU - Hahne, Josina
AU - Ryabchuk, Sergey
AU - Wahid, Ammar Bin
AU - Amorim, David
AU - Månsson, Erik P.
AU - Trabattoni, Andrea
AU - Osellame, Roberto
AU - Martínez Vázquez, Rebeca
AU - Calegari, Francesca
N1 - Funding Information: This work was funded by the European Research Council under the ERC-2014-StG STARLIGHT (Grant No. 637756), the Cluster of Excellence ‘CUI: Advanced Imaging of Matter’ of the Deutsche Forschungsgemeinschaft (DFG)—EXC 2056—project ID 390715994, the DFG—SFB-925—Project ID 170620586, the Helmoltz-Lund International Graduate School (HELIOS) and the European Union’s Horizon 2020 Research and Innovation Program under the Grant Agreement No. 964588 (XPIC). V W acknowledges support from the Partnership for Innovation, Education and Research (PIER) (PIF-2021-03). A T acknowledges support from the Helmholtz association under the Helmholtz Young Investigator Group VH-NG-1603.
PY - 2024/3/7
Y1 - 2024/3/7
N2 - 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.
AB - 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.
KW - differential pumping
KW - femtosecond laser micromachining
KW - frequency conversion
KW - third-harmonic generation
KW - ultrafast optics
KW - ultrafast UV spectroscopy
KW - ultraviolet radiation
UR - http://www.scopus.com/inward/record.url?scp=85187229477&partnerID=8YFLogxK
U2 - 10.1088/2515-7647/ad2bd3
DO - 10.1088/2515-7647/ad2bd3
M3 - Article
AN - SCOPUS:85187229477
VL - 6
JO - JPhys Photonics
JF - JPhys Photonics
IS - 2
M1 - 025005
ER -