Abstract

Optical properties of the ellipsoidal concave grating have been studied. The ellipsoidal concave grating has a circle as the focal curve which is similar to the Rowland circle in the spherical concave grating mounting. The grating equation is also the same as that of the spherical concave grating. By proper choice of lengths of the semi-axes of the ellipsoid, images are made nearly stigmatic and the optimum grating width is made wider than that of the spherical grating in a limited wavelength region. Comparison of optical properties of the ellipsoidal concave grating with those of the spherical concave grating is also shown graphically. The only difficulty in utilizing the ellipsoidal grating is the technical problem in ruling the gratings and in preparing the proper blanks.

© 1961 Optical Society of America

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