Mid-infrared(MIR)spectrometers are invaluable tools for molecular fingerprinting and hyper-spectral imaging.Among the available spectroscopic approaches,GHz MIR dual-comb absorption spectrometers have the potential to simultaneously combine the high-speed,high spectral resolution,and broad optical bandwidth needed to accurately study complex,transient events in chemistry,combustion,and microscopy.However,such a spectrometer has not yet been demonstrated due to the lack of GHz MIR frequency combs with broad and full spectral coverage.Here,we introduce the first broadband MIR frequency comb laser platform at 1 GHz repetition rate that achieves spectral coverage from 3 to 13 μm.This frequency comb is based on a commercially available 1.56 μm mode-locked laser,robust all-fiber Er amplifiers and intra-pulse difference frequency generation(IP-DFG)of few-cycle pulses in x(2)nonlinear crystals.When used in a dual comb spectroscopy(DCS)configuration,this source will simultaneously enable measurements with μs time resolution,1 GHz(0.03 cm-1)spectral point spacing and a full bandwidth of＞5 THz(＞166 cm-1)anywhere within the MIR atmospheric windows.This represents a unique spectroscopic resource for characterizing fast and non-repetitive events that are currently inaccessible with other sources.

Nazanin Hoghooghi;Sida Xing;Peter Chang;Daniel Lesko;Alexander Lind;Greg Rieker;Scott Diddams

Precision Laser Diagnostics Laboratory,University of Colorado,Boulder,CO 80309,USA;Time and Frequency Division,National Institute of Standards and Technology,Boulder,CO 80305,USA;Department of Physics,University of Colorado,Boulder,CO 80309,USA;Department of Chemistry,University of Colorado,Boulder,CO 80309,USA;Electrical Computer and Energy Engineering,University of Colorado,Boulder,CO 80309,USA

光：科学与应用（英文版）

[1]Nazanin Hoghooghi;Sida Xing;Peter Chang;Daniel Lesko;Alexander Lind;Greg Rieker;Scott Diddams-.Broadband 1-GHz mid-infrared frequency comb)[J].光：科学与应用（英文版）,2022(10):2358-2364

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