Ultra-broadband UV/VIS spectroscopy enabled by resonant dispersive wave emission of a frequency comb

We introduce a novel ultra-broadband ultraviolet and visible frequency comb light source covering more than 240 THz by resonant dispersive wave emission in a gas-filled hollow-core fiber waveguide. The light source allows tuning from ~340 nm to 465 nm (645 THz to ~885 THz) with conversion efficienci...

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Bibliographic Details
Published in:arXiv.org 2024-11
Main Authors: Kirchner, Adrian, Eber, Alexander, Fürst, Lukas, Hruska, Emily, Frosz, Michael H, Tani, Francesco, Bernhardt, Birgitta
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Broadband
Emission spectroscopy
Light sources
Nitrogen dioxide
Ultraviolet spectroscopy
Wave dispersion
Waveguides
Ytterbium
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Summary:We introduce a novel ultra-broadband ultraviolet and visible frequency comb light source covering more than 240 THz by resonant dispersive wave emission in a gas-filled hollow-core fiber waveguide. The light source allows tuning from ~340 nm to 465 nm (645 THz to ~885 THz) with conversion efficiencies of 1.5 %. Ultra-broadband absorption spectroscopy is demonstrated by studying nitrogen dioxide, a molecular species of major atmospheric relevance strongly absorbing across the ultraviolet and visible spectral region. We show that the coherence of the 80 MHz ytterbium fiber-based frequency comb seeding the frequency up-conversion process is conserved, paving the way toward further ultra-broadband (dual) comb spectroscopy across the ultraviolet/visible range.
ISSN:2331-8422