Generation control of a non-diffractive beam in random media by adjusting concentration

It takes a long distance of more than 200 m to generate a non-diffractive beam from an annular beam of 40 mm φ (diameter) in space. The authors have worked on the generation, control and optimization of a non-diffractive beam in random media with a short distance (a few tens of centimeters). In this work, the transmittance and the forward scattering waveforms of an annular beam at different propagation distances in random media are presented. Higher intensity of the center peak of a non-diffractive beam can be generated for short-distance propagation and high concentration in random media. The random media under consideration have the same scattering coefficients for all propagation distances. These scattering coefficients depend on the balance between forward scattering and multiple scattering. This balance is defined as the weight parameter α. By using the parameter α, an optimization of a non-diffractive beam in random media is proposed, which is based on adjusting the concentration and the propagation distance in random media.