Abstract

By using an electronic computer, rays were traced through six optical systems used in infrared spectrometers to determine what broadening of the image takes place as a result of geometrical-optical aberrations. The data obtained indicate that Littrow instruments, using either a prism or a grating, form sharp images in a plane behind that of the entrance slit. Czerny-Turner optical arrangements form images in front of the entrance slit plane which are not so sharp as those formed by the Littrow instrument. Comparison of broadening due to geometrical-optical aberrations with that due to diffraction shows that in most cases the former is considerably less. The data presented show graphically the curvature of the image formed.

© 1960 Optical Society of America

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