Sustained mutual coherence between 2 combs over extended periods is a prerequisite for dual-comb spectroscopy(DCS),particularly in achieving high-resolution molecular spectroscopy and precise spectral measurements.How...Sustained mutual coherence between 2 combs over extended periods is a prerequisite for dual-comb spectroscopy(DCS),particularly in achieving high-resolution molecular spectroscopy and precise spectral measurements.However,achieving long coherence times remains a challenge for Yb-doped frequency combs.This work introduces an experimental approach for phase-stable DCS using Yb-doped frequency combs at 1.03μm with a novel feed-forward method,combatting the limitations of mutual coherence.Without relying on postprocessing or self-correction algorithms,we achieve a coherence time of 1,000 s-3 orders of magnitude longer than the current state of the art for DCS.This extended coherence enables time-domain averaging,resulting in a signal-to-noise ratio(SNR)of 2,045.We demonstrate high-resolution monitoring of weak overtone transitions in the P and R branches of C_(2)H_(2),achieving good agreement with simulated spectra based on HITRAN parameters.The phase-locked multiheterodyne system also enables phase spectrum measurements with a scatter down to 7 mrad.Furthermore,we successfully extend our technique to the visible spectral region using second harmonic generation,achieving high-resolution spectra of NO_(2)with excellent SNR.The method offers high-frequency accuracy and demonstrates the potential of Yb-doped systems for multiplexed metrology,effectively extending the capabilities of DCS as a powerful tool for multi-disciplinary applications.展开更多
基金supported by the HORIZON EUROPE European Research Council(947288)Austrian Science Fund(FWF)(Y1254)funding from the European Union(grant agreement 101076933 EUVORAM).
文摘Sustained mutual coherence between 2 combs over extended periods is a prerequisite for dual-comb spectroscopy(DCS),particularly in achieving high-resolution molecular spectroscopy and precise spectral measurements.However,achieving long coherence times remains a challenge for Yb-doped frequency combs.This work introduces an experimental approach for phase-stable DCS using Yb-doped frequency combs at 1.03μm with a novel feed-forward method,combatting the limitations of mutual coherence.Without relying on postprocessing or self-correction algorithms,we achieve a coherence time of 1,000 s-3 orders of magnitude longer than the current state of the art for DCS.This extended coherence enables time-domain averaging,resulting in a signal-to-noise ratio(SNR)of 2,045.We demonstrate high-resolution monitoring of weak overtone transitions in the P and R branches of C_(2)H_(2),achieving good agreement with simulated spectra based on HITRAN parameters.The phase-locked multiheterodyne system also enables phase spectrum measurements with a scatter down to 7 mrad.Furthermore,we successfully extend our technique to the visible spectral region using second harmonic generation,achieving high-resolution spectra of NO_(2)with excellent SNR.The method offers high-frequency accuracy and demonstrates the potential of Yb-doped systems for multiplexed metrology,effectively extending the capabilities of DCS as a powerful tool for multi-disciplinary applications.
