Highly efficient higher order Laguerre-Gauss beam generation by optical energy recycling based on photorefractive two-wave mixing

In this paper, we propose a novel technique to generate higher order Laguerre-Gauss beams. We achieved this by recycling the optical energy of the zero-order beam by using photorefractive two-wave mixing to transfer some of the energy of the zero-order beam to the higher order Laguerre-Gauss beams.