Efficient diffraction grating for use in a grazing-incidence configuration

Numerical-experiment methods were used to investigate a combined structure consisting of a dielectric diffraction grating and a metal mirror. It was found that the diffraction efficiency of such a combined grating with specially selected parameters can reach 40% — 70% when the angle of incidence is 89°. This should make it possible to improve considerably the characteristics of single-frequency tunable pulsed lasers.