Quantum-noise-limited cavity ring-down spectroscopy |
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| Authors: | D A Long A J Fleisher S Wójtewicz J T Hodges |
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| Institution: | 1. National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD, 20899, USA
2. Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100, Torun, Poland
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| 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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