Abstract
Spectroscopists have long sought to make fast, continuous measurements of spectral lineshapes, to directly monitor the dynamics of chemical, optical, or physical processes. This ability would have many applications in both industry and academia. The authors use a frequency comb to obtain extremely high-quality spectra, with frequency and time resolutions close to the limits imposed by the Uncertainty Principle. This allows them to follow in real time the evolution of processes like power broadening and radiation reabsorption, and to explain some rather surprising observations about atomic vapors.
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