The instrument function of a wide angle Michelson interferometer spectrometer is derived in terms of known or easily measured functions using a novel method of computing the phase difference between the two beams. The interferometer essentially achieves immersion with solid materials and has the advantages of a larger field of view and fewer reflecting interfaces. A set of instrument functions is plotted in which either the field of view or the wavelength, with the other held fixed, may be interpreted as the parameter. The allowable field of view is found to increase linearly with the index of refraction of the cube material. A simple working model yielded both white light and mercury green light fringes. © 1968 Optical Society of America.
