Comb-locked frequency-swept synthesizer for high precision broadband spectroscopy
Type
ArticleAuthors
Gotti, Riccardo
Puppe, Thomas
Mayzlin, Yuriy
Robinson-Tait, Julian
Wójtewicz, Szymon
Gatti, Davide

Alsaif, Bidoor
Lamperti, Marco
Laporta, Paolo
Rohde, Felix
Wilk, Rafal
Leisching, Patrick
Kaenders, Wilhelm G.
Marangoni, Marco
KAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) DivisionElectrical Engineering Program
Date
2020-02-13Online Publication Date
2020-02-13Print Publication Date
2020-12Submitted Date
2019-10-31Permanent link to this record
http://hdl.handle.net/10754/661560
Metadata
Show full item recordAbstract
Frequency combs have made optical metrology accessible to hundreds of laboratories worldwide and they have set new benchmarks in multi-species trace gas sensing for environmental, industrial and medical applications. However, current comb spectrometers privilege either frequency precision and sensitivity through interposition of a cw probe laser with limited tuning range, or spectral coverage and measurement time using the comb itself as an ultra-broadband probe. We overcome this restriction by introducing a comb-locked frequency-swept optical synthesizer that allows a continuous-wave laser to be swept in seconds over spectral ranges of several terahertz while remaining phase locked to an underlying frequency comb. This offers a unique degree of versatility, as the synthesizer can be either repeatedly scanned over a single absorption line to achieve ultimate precision and sensitivity, or swept in seconds over an entire rovibrational band to capture multiple species. The spectrometer enables us to determine line center frequencies with an absolute uncertainty of 30 kHz and at the same time to collect absorption spectra over more than 3 THz with state-of-the-art sensitivity of a few 10-10 cm-1. Beyond precision broadband spectroscopy, the proposed synthesizer is an extremely promising tool to force a breakthrough in terahertz metrology and coherent laser ranging.Citation
Gotti, R., Puppe, T., Mayzlin, Y., Robinson-Tait, J., Wójtewicz, S., Gatti, D., … Marangoni, M. (2020). Comb-locked frequency-swept synthesizer for high precision broadband spectroscopy. Scientific Reports, 10(1). doi:10.1038/s41598-020-59398-1Sponsors
The authors acknowledge a financial contribution from the cooperative project OSR-2018-CARF-1975-06 between Politecnico di Milano and King Abdullah University of Science and Technology and by the project EMPATIA@Lecco ID: 2016-1428. S.W. is supported by the Polish Ministry of Science and Higher Education program “Mobility Plus” through Grant No. 1663/MOB/V/2017/0.Publisher
Springer NatureJournal
Scientific ReportsAdditional Links
http://www.nature.com/articles/s41598-020-59398-1ae974a485f413a2113503eed53cd6c53
10.1038/s41598-020-59398-1
Scopus Count
Except where otherwise noted, this item's license is described as Archived with thanks to Scientific Reports