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Vernier frequency sampling: a new tuning approach in spectroscopy—application to multi-wavelength integrated path DIAL

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Abstract

We present novel frequency tuning methods for broadband mid-infrared spectroscopy that take advantage of the unique frequency sampling properties of our recently developed “nested dual-cavity doubly resonant optical parametric oscillator” (NesCOPO). These methods, referred to as Vernier frequency sampling, enable mode-hop tuning with an adjustable virtual-cavity intermode spacing. Both frequency resolution and span are widely adjustable and can be tailored to fulfill the requirements either for broadband spectroscopy (>50 cm−1 spectral coverage) at low resolution or for high resolution (<0.01 cm−1) narrow band spectroscopy. The technique is applied to short-range (10 to 30 m) atmospheric CO2 measurements at 4.2 µm using integrated path differential absorption LIDAR.

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Acknowledgement

This work was partially supported by grants from Région Île-de-France.

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Authors and Affiliations

  1. ONERA—The French Aerospace Lab, Chemin de la Hunière, 91761, Palaiseau Cedex, France

    B. Hardy, M. Raybaut, J. B. Dherbecourt, J. M. Melkonian, A. Godard, A. K. Mohamed & M. Lefebvre

  2. ONERA/DMPH, Chemin de la Hunière, 91761, Palaiseau Cedex, France

    M. Raybaut

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  1. B. Hardy
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  2. M. Raybaut
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  3. J. B. Dherbecourt
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  4. J. M. Melkonian
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  5. A. Godard
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  6. A. K. Mohamed
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  7. M. Lefebvre
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Correspondence to M. Raybaut.

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Hardy, B., Raybaut, M., Dherbecourt, J.B. et al. Vernier frequency sampling: a new tuning approach in spectroscopy—application to multi-wavelength integrated path DIAL. Appl. Phys. B 107, 643–647 (2012). https://doi.org/10.1007/s00340-012-5039-0

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  • DOI: https://doi.org/10.1007/s00340-012-5039-0

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