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Asymmetric apodization is achieved by adding edge strips or rings to the diffraction slit or circular aperture. It is shown to be equivalent to the superposition of a diffraction field of the main entrance aperture and an interference field of the two edge strips or rings. For further improvement, apodization efficiency is defined as the ratio of integrals of the irradiance square after and before apodization. New designs are proposed to improve side-lobe suppression. The results after adjusting suitable parameters show that the apodization efficiencies are enhanced.
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Siu et al. (1994) studied this question.
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