Design of an integral field unit for a solar telescope

摘要

For solar observations high-resolved spectral instruments are most often used. Many scientific tasks require high spatial resolution along with high spectral one, which, in practice, might be reached through applying the integral field spectroscopy (IFS). In this paper, the ways of the mirror integral field unit (IFU) design for the Solar Telescope-Coronagraph are discussed. The telescope's main mirror diameter is equal to 3 m, the focal length is 40 m, the spectral range is 0.39 - 1.60 microns. The entrance angular optical field size is 0.75" × 12", which corresponds to the linear one of 0.145 mm × 2.327 mm at the telescope focal plane. The optical system design of an image slicer is presented. The possibility of the IFU (input NA = 0.0375) development, which cuts the entrance optical field from the telescope into 8 slices, is shown. The size of the final slit is 0.094" × 96" (0.018 mm × 18.617 mm), which provides 0.1" resolution limit.