From Event: SPIE Optical Engineering + Applications, 2016
We suggest a technique for generation of optical vortex beams with a variable orbital angular momentum based on a fiber laser array. The technique uses the phase control of each single subbeam. Requirements for the number of subbeams and the spatial arrangement for the vortex beam generation are determined. The propagation dynamics of a vortex beam synthesized is compared with that of a continuous Laguerre–Gaussian beam in free space and in a turbulent atmosphere. Spectral properties of a beam synthesized, which is represented as a superposition of different azimuth modes, are determined during its free-space propagation. It is shown that energy and statistical parameters coincide for synthesized and continuous vortex beams when propagating through a turbulent medium. Probability density functions of the beam intensity fluctuations are well approximated to a gamma distribution in the cases where the scintillation index is lower than unity independently of the beam type and observation point position relative to the propagation axis.
V. P. Aksenov, V. V. Dudorov, and V. V. Kolosov, "Vortex beam generation based on a fiber array combining and propagation through a turbulent atmosphere," Proc. SPIE 9979, Laser Communication and Propagation through the Atmosphere and Oceans V, 997908 (Presented at SPIE Optical Engineering + Applications: August 30, 2016; Published: 19 September 2016); https://doi.org/10.1117/12.2237604.
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