<title>New Techniques In Fourier Transform Spectroscopy</title>

Fourier transform spectroscopy is a nineteenth century technique which is continuing to develop in the twentieth century. In this paper we discuss (1) Fourier transform spectrometer modulators for light sources, (2) high temporal resolution Fourier transform spectroscopy of multiple fast pulses, and (3) correlation which allows the drawing of maps in "probabilities" rather than in colors.