3.3 - New Form of Cavity Enhanced Absorption Spectroscopy

Ch. Petermann & P. Fischer
Some of the most sensitive absorption measurements to date are based on schemes that use a resonant cavity to dramatically increase the path length of a light beam interacting with an absorbing analyte, such as a trace gas. In cavityenhanced absorption measurements one can either measure the absorption directly by observing a change in the magnitude of the transmitted light, or one can determine the change in the rate of absorption. The latter has the...