Abstract
We demonstrate a heterodyne-detected cavity ring-down spectroscopy (CRDS) method that allows for a noise-equivalent absorption coefficient of 6 × 10−14 cm−1 Hz−1/2, the lowest which has been reported in a CRDS measurement. It is shown that heterodyne-detected CRDS also reaches the quantum noise limit at reasonable optical powers. In addition to offering ultra-high sensitivity, this technique provides high frequency agility over a range of 2 THz in the near-infrared, which allows entire absorption bands to be recorded in minutes. As a demonstration experiment, high resolution spectra of a near-infrared carbon dioxide band have been recorded.
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Acknowledgments
Support was provided by an NIST Innovation in Measurement Science award and the NIST Greenhouse Gas Measurements and Climate Research Program. S. W. was partially supported by the Foundation for Polish Science TEAM Project co-financed by the EU European Regional Development Fund. We also thank H. Otten and J. Dement for loaning us the arbitrary waveform generator and offering assistance in generating the required waveforms.
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Long, D.A., Fleisher, A.J., Wójtewicz, S. et al. Quantum-noise-limited cavity ring-down spectroscopy. Appl. Phys. B 115, 149–153 (2014). https://doi.org/10.1007/s00340-014-5808-z
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DOI: https://doi.org/10.1007/s00340-014-5808-z