Abstract

This paper discusses the optical setup of a grazing-incidence spectrograph for the 10–30-nm far-UV region. The aberrations in this setup are corrected by using a variable-line-spacing diffraction grating. The variation of the spacing over the grating area is significant in such a setup and cannot be maintained if the grating is mechanically cut on a ruling engine. It is proposed to use a holographic analog grating with the calculated parameters. To record such a grating, it is necessary to include an auxiliary objective in the setup, mounted obliquely in one of the arms of the recording setup. The parameters of the latter are determined analytically for the meridional cross section and then fine-tuned by numerical optimization. The results of modeling a spectrograph setup with a holographic grating show that its spectral resolution corresponds to that of a setup with an ideal grating and reaches 0.01 nm.

© 2017 Optical Society of America

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