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    Bending modes metrology in the 14-15 $μ$m region

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    Type
    Preprint
    Authors
    Lamperti, M.
    Gotti, R.
    Gatti, D.
    Shakfa, M. K.
    Cané, E.
    Tamassia, F.
    Schunemann, P.
    Laporta, P.
    Farooq, Aamir cc
    Marangoni, M.
    KAUST Department
    Chemical Kinetics & Laser Sensors Laboratory
    Clean Combustion Research Center
    King Abdullah University for Science and Technology, Clean Combustion Research Center, Thuwal 23955, Saudi Arabia.
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-07-16
    Permanent link to this record
    http://hdl.handle.net/10754/664435
    
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    Abstract
    Frequency combs have triggered an impressive evolution of optical metrology across diverse regions of the electromagnetic spectrum, from the ultraviolet to the terahertz frequencies. An unexplored territory, however, remains in the region of vibrational bending modes, mostly due to the lack of single-mode lasers in the long-wavelength (LW) part of the mid-infrared (MIR) spectrum. We fill this gap through a purely MIR-based nonlinear laser source with tunability from 12.1 to 14.8 $\mu$m, optical power up to 110 $\mu$W, MHz-level linewidth and comb calibration. This enables the first example of bending modes metrology in this region, with the assessment of several CO$_2$-based frequency benchmarks with uncertainties down to 30 kHz, and the accurate study of the $\nu_{11}$ band of benzene, which is a significant testbed for the resolution of the spectrometer. These achievements pave the way for LW-MIR metrology, rotationally-resolved studies and astronomic observations of large molecules, such as aromatic hydrocarbons.
    Sponsors
    The authors acknowledge a financial contribution from the cooperative project OSR-2019-CCF-1975.34 between Politecnico di Milano and King Abdullah University of Science and Technology (KAUST) and by the project EMPATIA@Lecco ID: 2016-1428. F.T. and E.C. thank the University of Bologna for RFO funds.
    Publisher
    arXiv
    arXiv
    2007.08257
    Additional Links
    https://arxiv.org/pdf/2007.08257
    Collections
    Preprints; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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