Abstract
The results of our investigations on the control over the orbital angular momentum (OAM) of a laser beam synthesized through combination of wave fields of a fiber array are reviewed. Peculiarities of OAM formation in the case of control over the value of phase shifters of individual sub-beams are studied theoretically and experimentally. The conditions for formation of vortex beams with the given value of the orbital angular momentum are determined. The information coding by the OAM value is demonstrated in laboratory experiments. Statistical characteristics of vortex Laguerre—Gaussian and synthesized laser beams propagating through the turbulent atmosphere are studied theoretically. Versatile models are proposed for the probability density function of radiation intensity fluctuations in the cross section of an arbitrary-type beam propagating through turbulence of different strength. The spectrum of azimuthal modes of the synthesized vortex beam at its formation and propagation is analyzed.
Highlights
In the last decades, the great attention is paid to laser beams with orbital angular momentum (OAM) [1,2,3] due to their particular properties, which have found a lot of applications [4,5,6,7,8]
The results of our investigations on the control over the orbital angular momentum (OAM) of a laser beam synthesized through combination of wave fields of a fiber array are reviewed
We have reviewed the results of numerical simulation, presented schematically the experimental setup, and reported the results of laboratory experiments on generation of a vortex laser beam through coherent combining of laser sub-beams formed by a cluster of fiber radiators
Summary
1 V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia, 2 Tomsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia, 3 Scientific and Innovative Enterprise TOPAZ, Tomsk, Russia. Reviewed by: Han Zhang, Shenzhen University, China Jianming Wen, Kennesaw State University, United States. Specialty section: This article was submitted to Optics and Photonics, a section of the journal
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