This paper presents the proposal of a high resolution, integral field
spectrograph that is currently being designed for the 4-meter aperture
European Solar Telescope that will be located in the Canary Islands.
This instrument is optimized to study the solar chromosphere and
photosphere to allow the investigation of several phenomena concentrated
within these two layers. It will be able to observe simultaneously a
bidimensional field of view of 80 arcsec2 that is
reorganized, using an integral field unit, into 8 long slits of 200
arcsec length by 0.05 arcsec width. It will have the capability to
observe different layers of the Sun at the same time due to its
multi-wavelength capability that allows the observation of 5 visible and
3 near-infrared wavelength intervals from 3900 to 23,000 Å, with a
spectral resolution of about 300,000. The designed instrument is
telecentric and presents an optical quality limited by diffraction.