Reference-free dual-comb spectroscopy with inbuilt coherence

Mikhail Roiz; Santeri Larnimaa; Touko Uotila; Mikko Närhi; Markku Vainio; Markku Vainio; Markku Vainio

doi:10.1364/OL.521866

Optics Letters
Vol. 49,
Issue 9,
pp. 2473-2476
(2024)
•https://doi.org/10.1364/OL.521866

Reference-free dual-comb spectroscopy with inbuilt coherence

Mikhail Roiz, Santeri Larnimaa, Touko Uotila, Mikko Närhi, and Markku Vainio

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Mikhail Roiz, Santeri Larnimaa, Touko Uotila, Mikko Närhi, and Markku Vainio, "Reference-free dual-comb spectroscopy with inbuilt coherence," Opt. Lett. 49, 2473-2476 (2024)

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Table of Contents Category
- Spectroscopy
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About this Article
History
- Original Manuscript: February 21, 2024
- Revised Manuscript: March 28, 2024
- Manuscript Accepted: March 28, 2024
- Published: April 30, 2024

Abstract

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.

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