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1
Content available Manipulating far-field ring-shaped array according to the superposition of weight functions
Yuan Chenyuan, Yuan Caifu, Xiang Sufen, Ji Xiaoling, Wang Tao
Optica Applicata
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2023
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Vol. 53, nr 1
87--98
EN
In order to control the distribution characteristics of the far-field ring-shaped array, we introduce a new light source to produce adjustable far-field distribution by the method of weight function superposition. It has been shown that, by changing the parameters of the light source, one can obtain far-field with various distribution, including distribution with decrease in spectral intensity of specified rings, distribution with disappearances of specified rings, distribution with different spectral intensity of part of lobes in the continuous rings, distribution with part of the lobes in specified rings disappearing and distribution with some lobes in specified rings being stronger. These results will produce some novel far-field distributions which may provide a new idea for further study concerning about the manipulations of far-field array distribution.
2
Content available Degree of paraxiality of a multi-Gaussian beam diffracted by a circular aperture
Cheng Jinping, Xiao Yingying, Wu Hao, Ji Xiaoling, Wang Tao
Optica Applicata
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2023
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Vol. 53, nr 4
621--631
EN
The degree of paraxiality (DOP) of a diffracted multi-Gaussian beam is discussed. It is shown that the DOP of the multi-Gaussian beam will decrease as it is diffracted by a circular aperture, and the DOP of the diffracted multi-Gaussian beam is influenced by both the aperture radius and the characteristics of beam source. As an example, the dependence of the DOP on the aperture radius, the boundary characteristic, and the beam waist width is investigated.
3
Content available The far-zone behaviors of light waves on scattering from particulate medium with various distribution
Dai Qihang, Xie Zhongyuan, Pan Xiaoning, Ji Xiaoling, Wang Tao
Optica Applicata
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2022
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Vol. 52, nr 2
273--282
EN
The far-zone spectral density of light waves scattered on a particulate medium was discussed, and the influence of characteristics of the medium on the far-zone scattered spectral density was investigated. It is shown that the normalized spectral density of the scattered field is closely related with the structural characteristics of the particles collection, including the relative size of particles and the distribution information of particles in the collection. These results may provide potential application in the reconstruction of the structure information of particulate medium.
4
Content available Light waves scattering from an anisotropic semi-soft boundary medium with spectral dependence
Huang Zhiru, Dai Qihang, Ji Xiaoling, Wang Tao
Optica Applicata
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2021
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Vol. 51, nr 2
271--280
EN
The far-zone behavior of polychromatic light waves on scattering from an anisotrophic semi-soft boundary medium with spectral dependence was considered, and the spectral density and the spectral degree of coherence of the far-zone scattered field were investigated. It is shown that the distributions of the spectral density and the spectral degree of coherence of scattered field are closely related with the rms width, the center wavelength, and the maximum value of the center wavelength of the scattering potential of the scattering medium.
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