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Sensitivity Improvement in Dual Comb Spectroscopy With Time-Programmed Electro-Optic Frequency Combs

Year: 2025
Type: article
Abstract: We demonstrate the signal-to-noise ratio (SNR) and/or the recording speed improvement of dual comb spectroscopy (DCS) with time-programmed electro-optically modulated (EOM) frequency combs, in a simple all-fiber architecture. Unlike mode-locked laser based combs, where time-programming requires complex locking mechanisms, time-programming in EOM combs is simple and robust. Thus by directly engineering time-shifts into the pulse train of an EOM comb, the dead time of the interferogram signal in DCS is reduced. The utilized time-shifting technique is theoretically analyzed and the results are experimentally verified. A SNR improvement of 11.6 dB or a 13 times reduction in recording speed is demonstrated experimentally with this simple method. These results open new possibilities for improvement of SNR and/or recording speed of EOM-based multi-comb spectroscopic techniques.
DOI: 10.1109/jlt.2025.3544461
Authors: Debanuj Chatterjee, Eve-Line Bancel, Matteo Conforti, Siddharth Sivankutty, Hervé Rigneault, Pascal Szriftgiser, Steven Cundiff, Arnaud Mussot
Institutions: Centre National de la Recherche Scientifique, Université de Lille, Laboratoire de Physique des Lasers, Atomes et Molécules, Aix-Marseille Université, Institut Fresnel, Centrale Méditerranée, University of Michigan
Language: English
Open Access status: hybrid
Estimated APC paid: $2,645
OpenAlex ID: W4407783345
FWCI: 2.593
Cites: 44
Cited by: 7
Related to: 10