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Frequency-agile, rapid scanning spectroscopy: absorption sensitivity of 2 × 10−12 cm−1 Hz−1/2 with a tunable diode laser

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Abstract

We present ultrasensitive measurements of molecular absorption using frequency-agile rapid scanning, cavity ring-down spectroscopy with an external-cavity diode laser. A microwave source that drives an electro-optic phase modulator with a bandwidth of 20 GHz generates pairs of sidebands on the probe laser. The optical cavity provides for high sensitivity and filters the carrier and all but a single, selected sideband. Absorption spectra were acquired by stepping the tunable sideband from mode-to-mode of the ring-down cavity at a rate that was limited only by the cavity decay time. This approach allows for scanning rates of 8 kHz per cavity resonance, a minimum detectable absorption coefficient of 1.7 × 10−11 cm−1 after only 20 ms of averaging, and a noise-equivalent absorption coefficient of 1.7 × 10−12 cm−1 Hz−1/2. By comparison with cavity-enhanced laser absorption spectrometers reported in the literature, the present system is, to the best of our knowledge, among the most sensitive and has by far the highest spectrum scanning rate.

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Acknowledgments

Support was provided by the NIST Greenhouse Gas Measurements and Climate Research Program and a NIST Innovations in Measurement Science (IMS) award. G.-W. Truong was supported at NIST by an Australian Fulbright Fellowship.

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Authors and Affiliations

  1. National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD, 20899, USA

    D. A. Long, G.-W. Truong, R. D. van Zee, D. F. Plusquellic & J. T. Hodges

  2. Frequency Standards and Metrology Research Group, School of Physics, The University of Western Australia, Perth, WA, 6009, Australia

    G.-W. Truong

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  1. D. A. Long
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  2. G.-W. Truong
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  3. R. D. van Zee
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  5. J. T. Hodges
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Correspondence to D. A. Long.

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Long, D.A., Truong, GW., van Zee, R.D. et al. Frequency-agile, rapid scanning spectroscopy: absorption sensitivity of 2 × 10−12 cm−1 Hz−1/2 with a tunable diode laser. Appl. Phys. B 114, 489–495 (2014). https://doi.org/10.1007/s00340-013-5548-5

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  • DOI: https://doi.org/10.1007/s00340-013-5548-5

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