Stroud, J.
and Plusquellic, D.
(2022),
Difference-Frequency Chirped-Pulse Dual-comb Generation in the THz Region: Magnification of Molecular Dynamics of Water Vapor Lines by >60,000, Journal of Chemical Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933381
(Accessed October 2, 2025)
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Difference-Frequency Chirped-Pulse Dual-comb Generation in the THz Region: Magnification of Molecular Dynamics of Water Vapor Lines by >60,000
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Abstract
A new difference frequency method to perform terahertz dual-comb spectroscopy is reported based on electro-optic phase modulators (EOMs) and two free-running lasers. A variation of a near-IR interleaving scheme we recently reported has been developed to interleave the EOM's orders and sidebands and to map THz comb teeth into the radio-frequency region below 1 MHz. The down-converted comb teeth are shown to have transform limited widths of 1 Hz over 1 sec time scale. The dual chirp scheme is used to measure the complex line shapes of two water vapor lines below 600 GHz and to magnify the effects of rapid passage by more than 60,000. The method is applicable to any region where difference or sum frequency waves can be generated.Citation
Journal of Chemical Physics Letters
Volume
156
Pub Type
Journals
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Keywords
chirped pulse dual optical frequency comb, molecular dynamics
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Created January 24, 2022, Updated March 4, 2025