title: Analysis of the changes in efficiency across the ruled area of a concave diffraction grating.
abstract: Measurements and calculations have been made to investigate the effects due to the change in groove orientation on efficiencies of gratings ruled on a spherical surface. Typical efficiency maps across the surface are given for various angles of incidence and wavelengths in the VUV and UV regions. Computations based on electromagnetic theory show a good agreement with the experimental data over the 150-2500-A wavelength range. A simple explanation is given to interpret and predict the shape of efficiency maps obtained from both theory and experiments.
authors.forename: M
authors.initials: M
authors.lastname: Neviere
authors.forename: W R
authors.initials: WR
authors.lastname: Hunter