Mid-infrared(MIR)spectroscopy is instrumental in addressing gas molecule-related environmental and ecologi-cal challenges.Especially,massively parallel sensing capability is critical to multi-species molecules analysi...Mid-infrared(MIR)spectroscopy is instrumental in addressing gas molecule-related environmental and ecologi-cal challenges.Especially,massively parallel sensing capability is critical to multi-species molecules analysis,en-abling the demands for various MIR gas characterizations.However,real-time,high-accuracy parallel sensing for multiple gases remains a significant challenge due to the limitations in laser bandwidth and sampling speed.Here,we present a broadband MIR dual-comb spectrometer for the simultaneous detection of multiple greenhouse gases.This MIR spectrometer employs a scheme of difference frequency generation(DFG),directly producing a wide spectrum spanning 3.2–4.7μm with over 300,000 comb-tooth-resolved frequency lines at a 100 MHz resolution.In addition,we demonstrated the parallel detection of four mixed gas molecules(CH_(4),C_(2)H_(2),CO,and N_(2)O),in which the absorptions were in excellent agreement with HITRAN database.This broadband MIR dual-comb spectrometer is promising to be integrated with only fiber devices and periodically poled lithium niobate waveguides,providing a high-precision,high-efficiency approach for massively parallel sensing in atmos-pheric or industrial monitoring.展开更多
基金National Natural Science Foundation of China(12134004,62425503,12204178,12274141).
文摘Mid-infrared(MIR)spectroscopy is instrumental in addressing gas molecule-related environmental and ecologi-cal challenges.Especially,massively parallel sensing capability is critical to multi-species molecules analysis,en-abling the demands for various MIR gas characterizations.However,real-time,high-accuracy parallel sensing for multiple gases remains a significant challenge due to the limitations in laser bandwidth and sampling speed.Here,we present a broadband MIR dual-comb spectrometer for the simultaneous detection of multiple greenhouse gases.This MIR spectrometer employs a scheme of difference frequency generation(DFG),directly producing a wide spectrum spanning 3.2–4.7μm with over 300,000 comb-tooth-resolved frequency lines at a 100 MHz resolution.In addition,we demonstrated the parallel detection of four mixed gas molecules(CH_(4),C_(2)H_(2),CO,and N_(2)O),in which the absorptions were in excellent agreement with HITRAN database.This broadband MIR dual-comb spectrometer is promising to be integrated with only fiber devices and periodically poled lithium niobate waveguides,providing a high-precision,high-efficiency approach for massively parallel sensing in atmos-pheric or industrial monitoring.
