Chirped fourier spectroscopy. 2: theory of resolution and contrast.
When applied to a Fourier spectrometer, chirping raises questions about the resolution and contrast of the device. A theory is presented to show how the nonlinear phase affects the instrument profile and resolution; the penalty for chirping a high resolution interferometer is much smaller than had been believed. An algorithm is presented for recovering contrast; it is shown that the fast Fourier transform is still usable, allowing realization of full contrast. Systems bearing a residual nonlinear phase dispersion (accidental chirping) can take advantage of this theory.
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