Calculated and measured relative intensities for three orders appearing simultaneously in the spectrum of an echelette grating at λ 4.211 mm are obtained in both polarizations. Agreement with a calculation based on the Kirchhoff formula is found only for radiation plane polarized with E perpendicular to the grooves. An echelette grating is shown to be a polarizing agent.
JOHN H. ROHRBAUGH, CHARLES PINE, WILLIAM G. ZOELLNER, and ROBERT D. HATCHER, "Theory of the Echelette Grating. III," J. Opt. Soc. Am. 48, 710-710 (1958)