1.
Opt Lett
; 15(22): 1264-6, 1990 Nov 15.
Article
in English
| MEDLINE
| ID: mdl-19771060
ABSTRACT
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.