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<p>Optical frequency combs have facilitated fast and compact multi-component chemical analysis due to their broad spectral bandwidth. Although dual-comb spectrometers are an established implementation of this technology, their design requires a pair of matched combs with high mutual coherence, making the system considerably complex. In this study, we propose and implement a rapid, compact and broadband spectroscopy technique that operates without moving components, leveraging the stability, controllability and speed of a single Quantum&#xa0;Wwalk Ccomb laser. By using a comb based on a Quantum Cascade Laser, emitting within the molecular fingerprint region of the mid-infrared spectrum, we build a non-interferometric setup for the targeted and non-targeted analysis of various organic solvent vapours. With a time resolution as small as 10 <i>μ</i>s and a high dynamic range reaching three orders of magnitude in concentration, this approach is suitable for the real-time analysis of chemical kinetics.</p>

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Broadband comb spectroscopy through spectral envelope shaping

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月11日

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  • Ina Heckelmann,
  • Davide Pinto,
  • Uwe Schmitt,
  • Mattias Beck,
  • Jérôme Faist

摘要

Optical frequency combs have facilitated fast and compact multi-component chemical analysis due to their broad spectral bandwidth. Although dual-comb spectrometers are an established implementation of this technology, their design requires a pair of matched combs with high mutual coherence, making the system considerably complex. In this study, we propose and implement a rapid, compact and broadband spectroscopy technique that operates without moving components, leveraging the stability, controllability and speed of a single Quantum Wwalk Ccomb laser. By using a comb based on a Quantum Cascade Laser, emitting within the molecular fingerprint region of the mid-infrared spectrum, we build a non-interferometric setup for the targeted and non-targeted analysis of various organic solvent vapours. With a time resolution as small as 10 μs and a high dynamic range reaching three orders of magnitude in concentration, this approach is suitable for the real-time analysis of chemical kinetics.