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Apodization; point spread function; defocussing; spherical aberration; full-width at half-maximum; two-point resolution.

In this work, efficient amplitude-apodization pupils have been presented for tailoring the point spread function (PSF), which results in a decreased full-width at half-maximum (FWHM) and suppressed sidelobes. Comparison of PSF intensity profiles for both the unapodized and apodized cases have been reported. By analysing the resulting PSFs, the well-known effects induced by monochromatic aberrations such as defocussing effect, and the primary spherical aberration have been controlled for various degrees of apodization parameter $\beta$. It is shown that the two-point resolution of the apodized optical system significantly increased in the presence of aberrations. The proposed pupil apodizer is very effective in enhancing the resolution of the optical systems applicable in imaging and focussing applications.

ANDRA NARESH KUMAR REDDY¹ MAHDIEH HASHEMI² DASARI KARUNA SAGAR³

1. Samara National Research University, Moskovskoye Shosse, 34, Samara, Russia 443086
2. Department of Physics, College of Science, Fasa University, Fasa 74617-81189, Iran
3. Department of Physics, University College of Science, Osmania University, Hyderabad 500 007, India

Published

9 October 2020

Manuscript received

30 August 2019

Manuscript revised

31 May 2020

Accepted

29 July 2020

Final version published online

9 October 2020