Asymmetric apodization for the comma aberrated point spread function
Reddy A.N.K., Sagar D.K., Khonina S.N.

 

Samara National Research University, Samara, Russia,
Optics Research Group, Department of Physics, University College of Science, Osmania University, Hyderabad, Telangana, India,
Image Processing Systems Institute – Branch of the Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, Samara, Russia

Abstract:
This paper deals with the study of light flux distributions in the point spread function formed by an optical system with a one-dimensional aperture under the influence of the coma aberration. The traditional design of an asymmetric optical filter improves the resolution of a diffraction-limited optical imaging system. In this approach we explore the control of monochromatic aberrations through pupil engineering with asymmetric apodization. This technique employs the amplitude and phase apodization for the mitigation of the effects of third-order aberrations on the diffracted image. On introducing the coma wave aberration effect, the central peak intensity in the field of diffraction is a function of the edge strips width and the amplitude apodization parameter of a one-dimensional pupil filter, whereas the magnitude of the reduction of optical side-lobes is a function of the degree of phase apodization at the periphery of the aperture. The analytically computed results are illustrated graphically in terms of point spread function curves under various considerations of the coma aberrations and a different degree of amplitude and phase apodization. Hence, for the optimum values of apodization, the axial resolution has been analyzed using well-defined quality criteria.

Keywords:
asymmetric apodization, amplitude masking, optical filters, resolution, monochromatic aberrations.

Citation:
Reddy ANK, Sagar DK, Khonina SN. Asymmetric apodization for the comma aberrated point spread function. Computer Optics 2017; 41(4): 484-488. DOI: 10.18287/2412-6179-2017-41-4-484-488.

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