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A double -beam interferometer laboratory has been designed and built for use in testing a background opticalsuppression scheme (BOSS). The interferometer system features a 1 cm -1 double -beam interferometer (2 cm beamaperture), a tailored modulation transfer function for the two beams, a servo -controlled drive for the movingretroreflecting mirror, a laser retardation reference system, PbS detector and associated electronics, a 16Kfast fourier transform (FFT) analyzer, and a CRT plus X -Y plotter for displaying both interferograms and 1cm-1spectra in real time. The laboratory facility also includes a test source that projects a point source im-mersed in a controllable spatial background.IntroductionThe application of double -beam interferometers to the suppression of backgrounds, using a separate fieldfor each input beam, was first suggested by Fellgettl and (has been demonstrated by) Vanasse, Murphy, and Cook?Zehnpfennig, et a13 "describe various techniques where the modulation transfer functions (MTF) of the inputbeams of a double -beam interferometer are tailored so as to suppress the lower spatial frequencies of anextended background. Use of this technique allows the two input beams to be coaligned onto a single field of |
