Reference-free dual-comb spectroscopy with inbuilt coherence

We demonstrate a simple system for dual-comb spectroscopy based on two inherently coherent optical frequency combs generated via seeded parametric downconversion. The inbuilt coherence is established by making the two combs share a common comb line. We show that the inbuilt coherence makes it possib...

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Bibliographic Details
Published inOptics letters Vol. 49; no. 9; p. 2473
Main Authors Roiz, Mikhail, Larnimaa, Santeri, Uotila, Touko, Närhi, Mikko, Vainio, Markku
Format Journal Article
LanguageEnglish
Published United States 01.05.2024
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Summary:We demonstrate a simple system for dual-comb spectroscopy based on two inherently coherent optical frequency combs generated via seeded parametric downconversion. The inbuilt coherence is established by making the two combs share a common comb line. We show that the inbuilt coherence makes it possible to use a simple numerical post-processing procedure to compensate for small drifts of the dual-comb interferogram arrival time and phase. This enables long-time coherent averaging of the interferograms.
ISSN:1539-4794
DOI:10.1364/OL.521866