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Broadband Cavity Ringdown Spectroscopy for Sensitive and Rapid Molecular Detection



M Thorpe, K D. Moll, R J. Jones, B Safdi, Jun Ye


We demonstrate highly efficient cavity ringdom spectroscopy in which a broad-bandwidth optical frequency comb is coherently couple to a high finesse optical cavity that acts as the sample chamber. 125,000 optical comb components, each coupled into a specific longitudinal cavity mode, undergo ringdown decays when the cavity input is shut off. Sensitive intracavity absorption information is simultaneously available across 100 nanometers in the visible and near-infrared spectral regions. Real-time, quantitative measurements were made of the trace presence, the transition strengths and linewidths, and the population redistributions due to collisions and the temperature changes for molecules such as C2H2,Od2, H2O, and NH^d3.


broad bandwidth, cavity enhancement, frequency comb, sensitivity, spectroscopy


Thorpe, M. , Moll, K. , Jones, R. , Safdi, B. and Ye, J. (2006), Broadband Cavity Ringdown Spectroscopy for Sensitive and Rapid Molecular Detection, Science (Accessed May 30, 2024)


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Created February 28, 2006, Updated October 12, 2021