The Isometric Bar Grating as a Spectrum Intensity Discriminator

Abstract

With modern etching methods, self-supporting thin isometric bar gratings were manufactured while maintaining a great accuracy of their bar to spacing periodicity throughout their entire aperture. Relative spectrum intensities are determined in the image space by the position of the highest order of diffraction that remains observable. The influence of location and orientation of an isometric grating in a spectrograph and changes of the height of its entrance slit upon the image of the intensity spectrum is debated.