Time/frequency-domain characterization of a mid-IR DFG frequency comb via two-photon and heterodyne detection

Year: 2023

Authors: Gabbrielli T., Insero G., De Regis M., Corrias N., Galli I., Mazzotti D., Bartolini P., Huh JH., Cleff C., Kastner A., Holzwarth R., Borri S., Consolino L., De Natale P., Cappelli F.

Autors Affiliation: CNR INO Ist Nazl Ott, Via Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; LENS European Lab Nonlinear Spect, Via Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; CNR INO Ist Nazl Ott, Largo Fermi 6, I-50125 Florence, FI, Italy; Univ Florence, Dept Expt & Clin Biomed Sci Mario Serio, Viale Pieraccini 6, I-50139 Florence, FI, Italy; QTI Srl, Largo Fermi 6, I-50125 Florence, FI, Italy; PpqSense Srl, Viale Ariosto 492B, I-50019 Sesto Fiorentino, FI, Italy; Menlo Syst GmbH, Bunsenstr 5, D-82152 Martinsried, Germany; INFN Ist Nazl Fis Nucl, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.

Abstract: Mid-infrared frequency combs are nowadays well-appreciated sources for spectroscopy and frequency metrology. Here, a comprehensive approach for characterizing a difference-frequency-generated mid-infrared frequency comb (DFG-comb) both in the time and in the frequency domain is presented. An autocorrelation scheme exploiting mid-infrared two-photon detection is used for characterizing the pulse width and to verify the optimal compression of the generated pulses reaching a pulse duration (FWHM) as low as 196 fs. A second scheme based on mid-infrared heterodyne detection employing two independent narrow-linewidth quantum cascade lasers (QCLs) is used for frequency-narrowing the modes of the DFG-comb down to 9.4 kHz on a 5-ms timescale.

Journal/Review: OPTICS EXPRESS

Volume: 31 (21)      Pages from: 35330  to: 35342

More Information: European Union NextGenerationEU-I-PHOQS Infrastructure (IR0000016IDD2B8D520, CUP B53C22001750006) ; QuantERA II (101017733-QATACOMB Project) ; Horizon Europe Framework Programme (101070546-MUQIABIS Project, 87114-Laserlab-Europe Project) ; Horizon 2020 Framework Programme (820419-Qombs Project) ; Italian ESFRI Roadmap (Extreme Light Infrastructure – ELI Project) ; Fondazione Cassa di Risparmio di Firenze (SALUS Project) .
KeyWords: Quantum Cascade Laser; Femtosecond Pulses; Mu-m; Spectroscopy; Phase; Coherence; Precision
DOI: 10.1364/OE.493321

Citations: 2
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