title: Ray tracing in spectrometers with plane gratings and off-axis parabolas, including a new double pass system.
abstract: The results of some ray tracing calculations are presented in graphical form for various single and double pass configurations of a large plane grating with parabolic collimators and aperture f/10. Some advantages of systems with vertical displacement of slits above and below the grating are discussed. Results of calculations employing spherical mirrors are summarized briefly.
authors.forename: D F
authors.initials: DF
authors.lastname: Eggers
authors.forename: M A
authors.initials: MA
authors.lastname: Peterson