All-Reflective Computed-Tomography Imaging Spectrometers

Computed-tomography imaging spectrometers (CTISs) that contain only reflective optics (instead of at least some refractive optics) have been proposed. As is the case for other types of optical instruments, the change to all-reflective designs for CTISs would eliminate the chromatic aberration exhibited by refractive optics and would relieve designers of the task of finding optical materials with adequate transmissivity over wavelength ranges of interest. As a result, it would be easier to scale CTIS designs to different wavelength ranges from ultraviolet through long-wavelength infrared.