Study on power coupling of annular vortex beam propagating through a two-Cassegrain-telescope optical system in turbulent atmosphere

Abstract

As a new attractive application of the vortex beams, power coupling of annular vortex beam propagating through a two- Cassegrain-telescope optical system in turbulent atmosphere has been investigated. A typical model of annular vortex beam propagating through a two-Cassegrain-telescope optical system is established, the general analytical expression of vortex beams with limited apertures and the analytical formulas for the average intensity distribution at the receiver plane are derived. Under the H-V 5/7 turbulence model, the average intensity distribution at the receiver plane and power coupling efficiency of the optical system are numerically calculated, and the influences of the optical topological charge, the laser wavelength, the propagation path and the receiver apertures on the power coupling efficiency are analyzed. These studies reveal that the average intensity distribution at the receiver plane presents a central dark hollow profile, which is suitable for power coupling by the Cassegrain telescope receiver. In the optical system with optimized parameters, power coupling efficiency can keep in high values with the increase of the propagation distance. Under the atmospheric turbulent conditions, great advantages of vortex beam in power coupling of the two-Cassegrain-telescope optical system are shown in comparison with beam without vortex.

Design of a circum-scanning light detection and ranging emission system

“…Considering that semiconductor lasers have different divergence angles, an output spot cannot be used directly, causing the laser output beam to be shaped. In the current state of research, beam shaping methods include microlens array, 13 freeform lens, 14 diffractive optical elements, 15 telescope, and aspheric lens 16 , 17 . Considering the aspheric lens’s minimal size, simplicity, and slight energy loss, it is preferred for shaping semiconductor laser beams.…”

“…In the current state of research, beam shaping methods include microlens array, 13 freeform lens, 14 diffractive optical elements, 15 telescope, and aspheric lens. 16,17 Considering the aspheric lens's minimal size, simplicity, and slight energy loss, it is preferred for shaping semiconductor laser beams. This paper uses a single aspheric lens to align beams simultaneously in the fast and slow axes, and different surface shape parameters are designed for each.…”

Effect of optical system and turbulent atmosphere on the average intensity of partially coherent flat-topped vortex hollow beam

“…Based on the extended Huygens-Fresnel diffraction integral formula, the propagation eqation of laser beam through the ABCD optical system in atmosphere turbulence can be written as [2][3][4][5][6][7][8][9][10][11][12]:…”

“…And the optical system used in experiment will influence the evolution properties of laser beams propagating in turbulent atmosphere. Since the propagation of a laser beam propagation through an optical system in turbulent atmosphere is studied [2], various laser beam propagation through an optical system in turbulent atmosphere have been investigated, such as cosh-Gaussian beam [3], random electromagnetic beam [4], partially coherent cosine-Gaussian [5], stochastic electromagnetic Gaussian Schellmodel beam [6], radially polarized partially coherent beam [7], four-petal Gaussian [8], cylindrical vector Laguerre-Gaussian beam [9], elliptical Gaussian beam [10], annular vortex beam [11], four-petal Gaussian vortex beam [12] et al and with the development of laser technology, a new beam called flat-topped vortex hollow beam has been introduced and studied widely [13][14][15]. However, owing to its interesting properties and potential applications, the vortex beam has been widely studied.…”

An optimum analysis for Cassegrain optical antenna

“…By theoretical analysis [4,5], the electric field distribution of the Gaussian beam can be described as where…”