An aberration optimization method for concave holographic gratings in the Lyman ultraviolet band

In this paper, a concave holographic grating aberration optimization method is designed, which performs well in the aberration optimization of multi-channel narrow-band gratings. Taking the grating in the the project of CAFE (the Census of warm-hot intergalactic medium, Accretion, and Feedback Explorer) proposed by the Purple Mountain Observatory, Chinese Academy of Sciences, as the optimization target, this paper compares the method proposed with the traditional aberration function method and the spot diagram method commonly used currently in terms of the evaluation perspectives such as the line density deviation, the focusing curve offset, and the exit slit luminous flux, etc., and the optimization time is one thirtieth and one sixtieth of the two methods, respectively.