We present an imaging spectrometer developed for narrowband imaging at 1035 Å with high (~1-arc sec) spatial resolution over a modest field of view (~5 arc min). The instrument is based on a conventional Gregorian telescope with aberration-corrected holographic rulings on the secondary optic. These aberration-correcting rulings enable stigmatic imaging in diffracted light with a minimum number of optical elements, thereby maintaining a high system efficiency. The capabilities of this instrument allow us to map the distribution of UV-emitting material in the hot (~300, 000 K) plasma from shocks in supernova remnants. Although this design is optimized for imaging near 1035 Å, the basic concept can be applied to provide narrowband imaging or long-slit imaging spectroscopy at any wavelength. In addition, a larger field of view is possible with a corresponding loss in spatial resolution.
© 2004 Optical Society of America
Matthew Beasley, Catherine Boone, Nathaniel Cunningham, James Green, and Erik Wilkinson, "Imaging Spectrograph for Interstellar Shocks: A Narrowband Imaging Payload for the Far Ultraviolet," Appl. Opt. 43, 4633-4642 (2004)