First-order diffraction efficiency of 50% into a single beam was obtained from a weak symmetric square metal diffraction grating operated in an étalon at the 632.8-nm He–Ne laser wavelength. Without the étalon the diffraction efficiency was just 2.7% in each of the two first-order beams. First-order diffraction efficiency gain as well as blazing and apodizing of the grating occur because of the resonant paraxial angular spectrum of the étalon.
© 1990 Optical Society of America
Original Manuscript: April 23, 1990
Manuscript Accepted: September 10, 1990
Published: November 15, 1990
John Krawczak, Richard Dean, E. James Torok, and Gary Nelson, "Diffraction efficiency gain, blazing, and apodizing of a symmetric square reflection grating in an étalon," Opt. Lett. 15, 1264-1266 (1990)