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    Comb tooth resolved MIR spectroscopy using a VECSEL frequency comb and a virtually-imaged phased array spectrometer

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    Author
    Rockmore, Robert
    Gibson, Ricky
    Jones, R. Jason
    Moloney, Jerome
    Affiliation
    Univ Arizona, James C Wyant Coll Opt Sci
    Issue Date
    2020
    Keywords
    VECSEL
    frequency comb
    spectroscopy
    mid-infrared
    methane
    VIPA
    difference frequency generation
    GHz
    
    Metadata
    Show full item record
    Publisher
    SPIE-INT SOC OPTICAL ENGINEERING
    Citation
    Robert Rockmore, Ricky Gibson, R. Jason Jones, Jerome V. Moloney, "Comb tooth resolved MIR spectroscopy using a VECSEL frequency comb and a virtually-imaged phased array spectrometer," Proc. SPIE 11263, Vertical External Cavity Surface Emitting Lasers (VECSELs) X, 112630L (2 March 2020); https://doi.org/10.1117/12.2546752
    Journal
    VERTICAL EXTERNAL CAVITY SURFACE EMITTING LASERS (VECSELS) X
    Rights
    © 2020 SPIE.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Mid infrared frequency combs allow for high resolution absorption spectroscopy of molecular species, which have strong signatures in this spectral region. Dual comb spectroscopy can provide broadband and high-resolution capability, but requires two fully stabilized frequency combs which adds complexity to the system. Previous work has demonstrated that frequency combs coupled with a high resolution spectrometer, consisting of a virtually imaged phased array (VIPA) along with a grating, can perform time-resolved, broadband and high-resolution absorption spectroscopy with a single frequency comb. The VIPA spectrometer disperses the spectrum in two dimensions and images it onto a focal plane detector array. If the comb teeth can be resolved, the VIPA is easily calibrated and provides comb-tooth resolved resolution and accuracy. However, in previous work, the repetition rate of the laser sources used was too low to be resolved directly, and additional passive "filter cavities" had to be employed to increase the effective repetition rate of the frequency comb. In this work we use a fully stabilized mid infrared frequency comb based on a 1.6 GHz repetition rate modelocked vertical external cavity surface emitting laser (VECSEL) and difference frequency generation to produce an offset free comb in the 3-4 micron wavelength range. The source is directly coupled to the VIPA spectrometer to provide comb-tooth resolved absorption spectroscopy. We discuss the system's performance in gas absorption spectroscopy and its time resolving capabilities, which are limited only by the speed of the detector system.
    Note
    Immediate access
    ISSN
    0277-786X
    EISSN
    1996-756X
    DOI
    10.1117/12.2546752
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1117/12.2546752
    Scopus Count
    Collections
    UA Faculty Publications

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