Imaging channeled spectrograph: a high resolution spectrometer providing multiple simultaneous 2-D monochromatic images over a large spectral range

An imaging channeled spectrograph (ICS) consists of a Fabry-Perot bandpass filter followed by a wide slit imaging grating spectrograph. This unique configuration combines the 2-D monochromatic imaging of a Fabry-Perot system with the high resolution and comprehensive wavelength coverage of a grating spectrograph. The ICS produces a series of simultaneous, high resolution, nonoverlapping, 2-D monochromatic images uniformly distributed over a large spectral range. This paper describes the ICS optical properties in general and calculates the optical performance of an ICS designed for the proposed NRL spectrocoronagraph.