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1-GHz mid-infrared frequency comb spanning 3 to 13 μm



Nazanin Hoghooghi, Sida XIng, Peter Chang, Daniel Lesko, Alexander Lind, Greg Rieker, Scott Diddams


Mid-infrared (MIR) spectrometers are invaluable tools for molecular fingerprinting and imaging. Among the available spectroscopic approaches, 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 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 χ2 nonlinear crystals. When used in 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 >5THz anywhere within the MIR atmospheric windows and molecular fingerprint region. This represents a unique spectroscopic resource for characterizing fast and non-repetitive events that is not currently available with other frequency comb sources.
Light: Science & Applications


Mid-infrared frequency combs, difference frequency generation


Hoghooghi, N. , Xing, S. , Chang, P. , Lesko, D. , Lind, A. , Rieker, G. and Diddams, S. (2022), 1-GHz mid-infrared frequency comb spanning 3 to 13 μm, Light: Science & Applications, [online],, (Accessed April 17, 2024)
Created January 18, 2022, Updated March 26, 2024