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• W4383313166 abstract "Optimizing the signal-to-noise ratio (SNR) is critical to achieve high sensitivities across broad spectral ranges in dual-comb interferometry. Sensitivity can be improved through time-averaging, but only at the cost of reduced temporal resolution. We show that it is instead possible to use high-bandwidth detection combined with frequency-domain averaging of multiple copies of the dual-comb beat note. By controlling the signal and noise stationarity properties, one can even reduce the fundamental shot noise contribution compared to the normal, single copy, dual-comb operation where integration time is matched to, or larger than the repetition period. In principle, the use of Na aliased frequency-domain copies will improve SNR by up to Na, or equivalently, reduce acquisition time by a factor of Na. We demonstrate dual-comb interferometry using Na = 5 aliases, achieving the predicted fivefold reduction in shot noise power density at low frequencies. Over the full spectrum, unaveraged relative intensity noise limits the SNR, but we measure a 1.65× fold improvement in detection of CO2, corresponding to a 2.7× reduction in acquisition time for a given precision." @default.
• W4383313166 created "2023-07-07" @default.
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• W4383313166 date "2023-07-01" @default.
• W4383313166 modified "2023-10-18" @default.
• W4383313166 title "Unlocking a lower shot noise limit in dual-comb interferometry" @default.
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• W4383313166 doi "https://doi.org/10.1063/5.0153724" @default.
• W4383313166 hasPublicationYear "2023" @default.
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