The effect on photometric-setting accuracy of mechanical misalignments and surface errors of the end mirrors of a double-passed Michelson interferometer has been analyzed. Tolerance limits are given for the mirror quality and their misalignments.
K. SINGH and B. N. GUPTA, "Effect of Surface Errors and Misalignment of End Mirrors on the Photometric-Setting Accuracy of the Double-Passed Michelson Interferometer," J. Opt. Soc. Am. 58, 664-666 (1968)