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      https://www.ias.ac.in/article/fulltext/pram/090/06/0077

    • Keywords

       

      Aberrations; diffraction; point spread function; apodization; resolution

    • Abstract

       

      The technique proposed to enhance the resolution of the point spread function (PSF) of an optical system underneath defocussing and spherical aberrations. The method of approach is based on the amplitude and phase masking in a ring aperture for modifying the light intensity distribution in the Gaussian focal plane ($Y_{D} = 0$) and in the defocussed planes ($Y_{D} = \pi$ and $Y_{D} = 2\pi$). The width of the annulus modifies the distribution of the light intensity in the side lobes of the resultant PSF. In the presence of an asymmetry in the phase of the annulus, the Hanning amplitude apodizer [cos($\pi\beta\rho$)] employed in the pupil function can modify the spatial distribution of light in the maximum defocussed plane ($Y_{D} = 2\pi$), results in PSF with improved resolution.

    • Author Affiliations

       

      ANDRA NARESH KUMAR REDDY1 2 3 MAHDIEH HASHEMI4 SVETLANA NIKOLAEVNA KHONINA1 2

      1. Samara National Research University, Moskovskoye Shosse, 34, Samara 443086, Russia
      2. Image Processing Systems Institute – Branch of the Federal Scientific Research Centre, “Crystallography and Photonics” of Russian Academy of Sciences, 151 Molodogvardeyskaya St., Samara 443001, Russia
      3. School of Engineering, Anurag Group of Institutions, Venkatapur, Ghatekesar, Medchal District, Hyderabad 500 088, India
      4. Department of Physics, College of Science, Fasa University, Fasa 74617-81189, Iran
    • Dates

       
  • Pramana – Journal of Physics | News

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