This article proposes layouts of increased-efficiency astronomical spectropolarimeters constructed using the same concept: a UV spectropolarimeter for the range 0.23-0.40 µm and a spectropolarimeter for the visible range 0.4-0.87 µm. It is shown that a limited number of elements can serve the function of optical reducer, dispersive unit, and aberration corrector. Such an approach is especially suitable in the UV region, in which the numerous elements of classical spectropolarimeters result in large losses. The dispersive system of each of the polarimeters levels off the dispersion, and this also increases the efficiency of the device in the short-wavelength region.
Yu. S. Ivanov, I. I. Sinyavskiĭ, and M. G. Sosonkin, "Astrospectropolarimeters for weak objects," J. Opt. Technol. 73, 879-882 (2006)