K. Ait-ameur et al., High transverse mode discrimination in apertured resonators using diffractive binary optics, OPT COMMUN, 184(1-4), 2000, pp. 73-78
We demonstrate theoretically that the discrimination between TEM00 and TEM0
1 modes achieved by a hard apertured resonates is greatly enhanced by the i
nsertion of a simple binary diffractive optic inside the resonator. The lat
ter, known as pi/2 plate, introduces a constant phase shift in the central
region of the beam. (C) 2000 Elsevier Science B.V. All rights reserved.