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CO-laser side-band spectrometer: Sub-Doppler heterodyne frequency measurements around 5 µm

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Abstract

We report the realization of a tunable sub-Doppler heterodyne spectrometer with high absolute accuracy, employing side-band generation with a CO laser. The fixed-frequency CO-gas laser, working from 4.7 to 8.4µm, is made partially tunable by the use of microwave side-band generation in a CdTe Electro-Optical Modulator (EOM). This leads to tunable radiation of high spectral purity. We describe the design of the microwave EOM, adapted to the CO laser, its performance and its first application to highly accurate frequency measurements. The side-band radiation is used for sub-Doppler stabilization of the CO laser, while the carrier frequency is mixed with the frequencies of two CO2 reference lasers. As a first result, we present measurements of OCS transitions in the 4.9µm (61 THz) region, reaching an absolute accuracy of 30 kHz (Δν/ν = 5×1O−10). Further application of our spectrometer to calibration gases will establish a variety of InfraRed (IR) calibration standards with a new quality of accuracy.

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Author notes

  1. T. George

    Present address: Laboratoire de Physique des Lasers, Avenue J.-B. Clèment, F-93430, Villetaneuse, France

  2. F. Kühnemann

    Present address: Department of Chemistry and Department of Astronomy and Astrophysics, The University of Chicago, 5735 S. Ellis Avenue, 60637, Chicago, IL, USA

  3. M. Schneider

    Present address: Forschungsinstitut der Zementindustrie, Tannenstrasse 2, D-40476, Düsseldorf, Germany

Authors and Affiliations

  1. Institut für Angewandte Physik der Universität Bonn, Wegelerstrasse 8, D-53115, Bonn, Germany

    B. Meyer, S. Saupe, M. H. Wappelhorst, T. George, F. Kühnemann, M. Schneider, M. Havenith & W. Urban

  2. Laboratoire de Spectroscopie Hertzienne, Associée au Centre National de la Recherche Scientifique, Université de Lille, F-59655, Villeneuve d'Ascq Cedex, France

    J. Legrand

Authors
  1. B. Meyer
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  2. S. Saupe
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  3. M. H. Wappelhorst
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  4. T. George
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  5. F. Kühnemann
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  6. M. Schneider
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  7. M. Havenith
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  8. W. Urban
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  9. J. Legrand
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Additional information

On visit from: Fachbereich Physik, Humboldt-Universität zu Berlin

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Meyer, B., Saupe, S., Wappelhorst, M.H. et al. CO-laser side-band spectrometer: Sub-Doppler heterodyne frequency measurements around 5 µm. Appl. Phys. B 61, 169–173 (1995). https://doi.org/10.1007/BF01090939

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  • DOI: https://doi.org/10.1007/BF01090939

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