Universal ray method for aberration calculation of spectral and   polarization selective optical diffraction systems
  This paper is dedicated to method for spectral and polarization selective optical systems properties investigations for accurate analysis of nonclassical diffraction gratings properties: aspherical surfaces, variable grating step, variable line shape, etc. Using the proposed method and algorithm an accurate spectral image and apparatus function of Seya-Namioka diffraction monochromator were calculated. Another advantage of the method is its applicability to spectropolarimeters schema analysis. 
V.M.Vashchenko, Ye.A. Loza, Zh.I.Patlashenko
physics.optics