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Free keywords:
ELLIPTIC GAUSSIAN-BEAM; PARAXIAL OPTICAL-SYSTEMS; COHERENT GENERAL
BEAMS; FLAT-TOPPED BEAMS; LASER ARRAY BEAMS; TURBULENT ATMOSPHERE;
PROPAGATION PROPERTIES; AVERAGE INTENSITY; MODEL; POLARIZATIONOptics; dark hollow beam; scintillation; propagation; turbulent atmosphere;
Abstract:
The scintillation properties of a rectangular dark hollow beam (DHB) in a weak turbulent atmosphere are investigated. Explicit expression for the on-axis scintillation index of a rectangular DHB is derived. It is found that the scintillation index value of a rectangular DHB can be smaller than that of Gaussian, elliptical Gaussian and rectangular flat-topped beams in a weak turbulent atmosphere under certain conditions. Our results will be useful in long-distance free-space optical communications. The scintillation properties of a rectangular DHB are closely controlled by its initial beam parameters.
