Dispersive Fourier transform spectroscopy

Abstract Dispersive Fourier transform spectroscopy (DFTS) is a technique for determining the optical constants of solids, liquids and gases from direct measurements of both the amplitude and phase of either their reyection or transmission coeficients. Measurements are usually made at normal incidence with the specimen in one arm of a Michelson interferometer. The technique has been widely used for measurements in the far-infrared region of the spectrum, where the phase measurement is comparatively straightforward. Recent developments have established the feasibility of extending the spectral range to the visible and ultraviolet. In this article the principles of DFTS are briefly reviewed, and a selection of results presented to illustrate the scope and potential of the technique.