Abstract

A Fourier-transform spectrometer has been built by using a common-path ring design for the as interferometer and a two-dimensional charge-coupled device array for the detector. The detector records the Fourier-Fraunhofer hologram that is produced by the sheared images of the source. The advantages of such a device have been published,¹ and initial results have been reported.² Further results of optical spectra measurements, at medium resolution will be shown. The aliasing problem associated with obtaining higher resolution spectra over a broad band has been solved without the need for narrow-band filters or the use of a cross disperser. A slight rotation of the detector array with respect to the fringe direction, along with the use of a two-dimensional transform, sorts the normally overlapping orders formed when the interference pattern is undersampled.

© 1990 Optical Society of America