Journal ArticleDOI
Apodization for improving the two-point resolution of coherent optical systems with defect of focus
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TLDR
In this paper, an amplitude apodization influenced defocused optical system used to form a coherent light illuminated two-point sources with an improved resolution was analyzed and the composite coherent image intensity distributions in the defocused and the Gaussian (Yd = 0) planes have been calculated and compared.Abstract:
An amplitude apodization influenced defocused optical system used to form a coherent light illuminated two-point sources with an improved resolution is analyzed. The composite coherent image intensity distributions in the defocused and the Gaussian (Yd = 0) planes have been calculated and compared. It has shown the resolution of the apodized optical system is significantly increased for an excessive amount of defocusing effect. As is clearly evidenced by the presence of irradiance dip in the resulting intensity profiles can describe the super-two-point resolution phenomena in a maximum defocused plane (Yd = 2π).read more
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Proceedings ArticleDOI
Application of a neural network for calculating the surface relief of a different level two-zone lens with an increased depth of field
TL;DR: In this article, a two-zone different level Fresnel lens was used to increase the depth of field of a neural network-based image restoration system, which is used to restore the image.
Journal ArticleDOI
Power Phase Apodization Study on Compensation Defocusing and Chromatic Aberration in the Imaging System
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TL;DR: In this paper, a detailed comparative study of the parametric high degree (cubic, fourth, and fifth) power phase apodization on compensation defocusing and chromatic aberration in the imaging system was performed.
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Coherent Noise Suppression Using Adaptive Homomorphic Filtering for Wideband Electromagnetic Imaging System.
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TL;DR: An adaptive homomorphic filtering is proposed to overcome the limitations of conventional methods from 1 GHz–6 GHz and can significantly improve the quality of electromagnetic images in terms of maximum sidelobe level (MSL) by 15 dB and dynamic range of the system over 20 dB, compared with conventional narrowband denoising methods.
References
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Journal ArticleDOI
Speckle Reduction in Laser Projection Systems by Diffractive Optical Elements
TL;DR: A new method for eliminating speckles in the far field by using a diffractive optical element is proposed, which can be reduced to a few percent while good beam quality is preserved.
Journal ArticleDOI
Aberrations of flat lenses and aplanatic metasurfaces
TL;DR: It is found that aberration-free focusing is possible under axial illumination but off-axis aberrations appear when the excitation is not normal to the interface.
Journal ArticleDOI
Third-Order Aberrations of Inhomogeneous Lenses
TL;DR: In this article, the third-order aberration coefficients of a symmetric system may be computed when the lenses are manufactured from glasses with continuously varying refractive indices, and the surface contribution consists of the usual contribution based on the assumption that the media are homogeneous, and an additional term that takes into account the variation of the index along the surface.
Journal ArticleDOI
Tailoring the axial shape of the point spread function using the Toraldo concept.
TL;DR: A novel procedure for shaping the axial component of the point spread function of nonparaxial focusing systems by use of phase-only pupil filters is presented, based on the Toraldo technique for tailoring focused fields.
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