Abstract

A Fourier transform spectrometer has been built using dual, common path, orthogonal, ring interferometers and 2-D CCD array as detector. A channelled Fourier-Fraunhofer hologram is produced from the sheared images of the source. The advantages of the use of a single Sagnac interferometer have been previously published¹ and results reported.² The problem of aliasing associated with obtaining higher resolution spectra over a large spectral range has been addressed without the need for narrow band filters. The use of an orthagonally oriented, second ring interferometer sorts the normally overlapping orders formed when the interference pattern is undersampled. Results of the measurement of optical spectra will be shown.

© 1991 Optical Society of America