Fast Fourier transform spectroscopy with broadband strongly modulated quantum cascade lasers
The combination of speed and resolution is a fundamental figure of merit for Fourier transform spectroscopy. Here, we show that, by combining a fast rotational delay line with a strongly modulated quantum cascade laser (QCL), it is possible to perform broadband spectroscopy over a range of 175 cm−1, with a total effective integration time of about 6 s and a resolution of 0.03 cm−1. Remarkably, even though the resolution of the measurement is limited by the source, the interleaving technique can still be applied when the QCL is not in a frequency comb regime, considerably broadening the bandwidth of the instrument.
Authors
- Giacomo Scalari (ORCID: https://orcid.org/0000-0003-4028-803X)
- Mathieu Bertrand (ORCID: https://orcid.org/0000-0001-9016-8103)
- Jérôme Faist (ORCID: https://orcid.org/0000-0003-4429-7988)
- Diego Piciocchi (ORCID: https://orcid.org/0000-0002-5983-9789)
- Alessio Cargioli (ORCID: https://orcid.org/0000-0002-5556-6963)
Institutions
- ETH Zurich (CH)
Publication Details
- Journal
- Applied Physics Letters
- Published
- 2024-09-23
- DOI
- https://doi.org/10.1063/5.0226044
- Citations
- 2
- Primary Topic
- Spectroscopy and Laser Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.48
Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Staatssekretariat für Bildung, Forschung und Innovation
- National Center of Competence in Research Quantum Science and Technology