Generation of rotating gauss—Laguerre modes with binary-phase diffractive optics

We demonstrate the rotation of multimodel Gauss—Laguerre beams generated with a binary-phase diffractive element. The element is designed with the use of an iterative procedure and quantized in two levels after adding a carrier frequency to the phase. The fabrication technology of the diffractive element involves e-beam lithography and reactive ion etching. Experimental and theoretical results are shown to be in good conformity.