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arXiv · 2411.01513

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

Adrian Kirchner·Alexander Eber·Lukas Fürst·Emily Hruska·Michael H. Frosz·Francesco Tani·Birgitta Bernhardt
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Abstract

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.

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Adrian Kirchner, Alexander Eber, Lukas Fürst, Emily Hruska, Michael H. Frosz, Francesco Tani, Birgitta Bernhardt. 2024-11-03. Ultra-broadband UV/VIS spectroscopy enabled by resonant dispersive wave emission of a frequency comb. https://arxiv.org/abs/2411.01513

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