RINGDOWN SPECTRAL PHOTOGRAPHY

A new technique is presented which enables high-resolution cavity ring down spectra to be obtained over a relatively large spectral region on microsecond timescales. The ringdown spectral photography (RSP) techn ique employs two key principles to simultaneously record the time and frequency response of the cavity along orthogonal axes of a two-dimens ional array detector in a single-shot fashion. In these initial, proof -of-principle studies, the concepts employed in the RSP method are dem onstrated and the fifth overtone spectrum of propane in the 635 nm reg ion is measured. (C) 1998 Published by Elsevier Science B.V. All right s reserved.