Some recent theorical results for gratings; Application to their use in the very far ultraviolet region

Abstract

We first emphasize the original features of our integral formalism and of its numerical applications. We revue the most important results already published for the visible and the near ultraviolet. Then we report new numerical results for the very far ultraviolet and, taking them into account, we discuss the most efficient way to use diffraction gratings in this range of wavelength. A very simple formula is given for the efficiency in the blaze order.