Abstract
For the selection of spacer ratios for the Pepsios spectrometer, a theory has been developed which evaluates the parasitic light by complex integration. The problem of finding the optimum set of ratios for a given set of parameters has not been solved, but for a three-etalon Pepsios instrument operating at a resolving power of the order of 105 to 106 over a wide range of values of finesse and filter half-intensity width, a set of spacings in the ratios 1.0000:0.8831:0.7244 has been found to exhibit an instrumental transmittance with especially high spectral purity.
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