Work

Fast Fourier transform spectroscopy with broadband strongly modulated quantum cascade lasers

Year: 2024

Type: article

Abstract: 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.

Source: Applied Physics Letters

DOI: 10.1063/5.0226044

Authors: A. Cargioli, D. Piciocchi, M. Bertrand, J. Faist, G. Scalari

Institutions: ETH Zurich, Institute for Quantum Electronics

Language: English

Topic: Spectroscopy and Laser Applications

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: hybrid

Funders: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Staatssekretariat für Bildung, Forschung und Innovation, National Center of Competence in Research Quantum Science and Technology, H2020 European Research Council

Awards: G3099111045, On CHip terahertz frequency Combs, Integrated, fast on-chip combs and detectors for coherent THz photonics