Abstract

A gain of luminosity greater than 100 is obtained by replacing the entrance and exit slits of a spectrometer by a two-dimensional set of alternately transparent and nontransparent zones, the limit curves of which are regularly assembled equilateral hyperbolas having common asymptotes. One of the asymptotes is parallel to the slits of the conventional spectrometers. The general construction and, to some extent, the handling qualities of conventional spectrometers are not altered. The Littrow-type mounting is particularly advantageous. The examples of the results mentioned have been obtained with an apparatus having a focal length of two meters using the single-beam and single-pass principle.

© 1963 Optical Society of America

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