Formation of phase vortices by means of holograms with asymmetric pattern

The paper presents an experimental study of the application of thin holograms with increased (due to the use of a triangular pattern profile) diffraction efficiency for the formation of light beams with non-zero orbital moments (phase vortices). It is shown that in this case efficiency can be increased substantially (in theory — up to 100%). Transformation is done without any distortion of the formed beam.