RT Journal Article
SR Electronic
T1 Broadband Cavity Ringdown Spectroscopy for Sensitive and Rapid Molecular Detection
JF Science
JO Science
FD American Association for the Advancement of Science
SP 1595
OP 1599
DO 10.1126/science.1123921
VO 311
IS 5767
A1 Thorpe, Michael J.
A1 Moll, Kevin D.
A1 Jones, R. Jason
A1 Safdi, Benjamin
A1 Ye, Jun
YR 2006
UL http://science.sciencemag.org/content/311/5767/1595.abstract
AB We demonstrate highly efficient cavity ringdown spectroscopy in which a broad-bandwidth optical frequency comb is coherently coupled 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, O2, H2O, and NH3.