Metrology of frequency comb sources: assessing the coherence, from multimode to mode-locked operation

Year: 2024

Authors: Eramo R., Sorgi A., Gabbrielli T., Insero G., Cappelli F., Consolino L., De Natale P.

Autors Affiliation: CNR INO Ist Nazl Ott, Via Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; Via Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; Univ Florence, Dept Expt & Clin Biomed Sci Mario Serio, Viale Pieraccini 6, I-50139 Florence, FI, Italy.

Abstract: Since the beginning of this millennium, frequency comb generators have reshaped frequency metrology and related areas. After more than two decades since their first realization, several other ways to generate frequency combs, in any spectral region, have been demonstrated, each way with its peculiar features. This trend has triggered the need to quantitatively assess how close the new comb realizations are to an ideal comb, a feature that will be called combness throughout this paper. We will briefly review the very dynamic area of novel frequency comb sources and we will describe the techniques that have been recently developed to quantitatively assess the key parameters of old and new frequency combs, in view of the specific applications. Finally, we will try to sketch future steps in this recently born research area.

Journal/Review: NANOPHOTONICS

Volume: 13 (10)      Pages from: 1701  to: 1709

More Information: The authors acknowledge financial support by the European Union’s NextGenerationEU Programme (https://doi.org/10.13039/100018693) with the I-PHOQS Infrastructure [IR0000016, ID D2B8D520, CUPB53C22001750006] Integrated infrastructure initiative in Photonic and Quantum Sciences, by the European Union’s Research and Innovation Programmes Horizon 2020(https://doi.org/10.13039/100010661) and Horizon Europe(https://doi.org/10.13039/100018693) with the Qombs Project[G.A. n. 820419] Quantum simulation and entanglement engineering in quantum cascade laser frequency combs, the Laser lab-Europe Project [G.A. n. 871124], and the MUQUABIS Project [G.A. n. 101070546] Multiscale quantumbio-imaging and spectroscopy, by the European Union’s QuantERA II (https://doi.org/10.13039/501100020314) [G.A. n.101017733] – QATACOMB Project Quantum correlations interahertz QCL combs, and by the Italian ESFRI Roadmap(Extreme Light Infrastructure – ELI Project).
KeyWords: frequency comb; coherence; mode locking; laser
DOI: 10.1515/nanoph-2023-0805

Citations: 1
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