Low Efficiency Diffraction Grating Theory.
NAVAL WEAPONS CENTER CHINA LAKE CALIF
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The scattering of light from low efficiency reflective diffraction gratings is theoretically analyzed using a first-order perturbation technique. While results are concerned primarily with radiation of 10.6 micrometer wavelength, the theory is valid for all wavelengths for which the dielectric constant of the grating is negative. Results apply to grating groove profiles of arbitrary shape in the low efficiency region. Included are analyses of diffraction from bare gratings, from gratings overcoated with a single dielectric layer and from gratings with multiple dielectric layers. Consideration is also given to diffuse scattering from random roughness superimposed on the perfectly formed grating groove profile and to coupling of the incident beam energy into surface waves.