A fixed delay interferometer is placed at the slit of the Lick Obs. 2d-echelle spectrograph to imprint a periodic sinusoidal fringe comb against the input spectrum. This boosts the effective resolution by a factor of 2-3.
© 2003 Optical Society of America
D. J. Erskine, " Externally Dispersed Interferometer: Implementation on a 2d Echelle Spectrograph," in Fourier Transform Spectroscopy, A. Sawchuk, ed., Vol. 84 of OSA Trends in Optics and Photonics (Optical Society of America, 2003), paper FMD20.
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