Publication: Frequency accurate coherent electro-optic dual-comb spectroscopy in real-time
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2018-04-16
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Optica
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Abstract
Electro-optic dual-comb spectrometers have proved to be a promising technology for sensitive, high-resolution and rapid spectral measurements. Electro-optic combs possess very attractive features like simplicity. reliability, bright optical teeth, and typically moderate but quickly tunable optical spans. Furthermore; in a dual-comb arrangement; narrowband electro-optic combs are generated with a level of mutual coherence that is sufficiently high to enable optical multiheterodyning Without inter-comb stabilization or signal processing systems. However, this valuable tool still presents several limitations, for instance; on most systems; absolute frequency accuracy and long-term stability cannot be guaranteed; likewise; interferometer-induced phase noise restricts coherence time and limits the attainable signal-to-noise ratio. In this paper, We address these drawbacks and demonstrate a cost-efficient absolute electro-optic dual-comb instrument based on a frequency stabilization mechanism and a novel adaptive interferogram acquisition approach devised for electro-optic dual-combs capable of operating in real-time. The spectrometer, completely built from commercial components, provides sub-ppm frequency uncertainties and enables a signal-to-noise ratio of 10000 (intensity noise) in 30 seconds of integration time.
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Adaptive Optics, Signal Processing, Spectrometers, Stabilization, Absolute frequency, Commercial components, Frequency stabilization, Integration time, Long term stability, Mutual coherence, Signal processing systems, Spectral measurement, Signal to noise ratio
Bibliographic citation
Martín-Mateos, P., Jerez, B., Largo-Izquierdo, P. & Acedo, P. (2018). Frequency accurate coherent electro-optic dual-comb spectroscopy in real-time. Optics Express, 26(8), 9700.