నైరూప్య

Apodised optical systems in resolving two point objects with shrink apertures

B. Sambaiah and D. Karuna Sagar

The influence of apodisation on the resolution of two point objects in the case of shrink apertures of rotationally symmetric optical systems has been studied by applying the modified Sparrow criterion introduced by Asakura to suit the case of unequally bright object points. The results are presented in terms of Rayleigh and Sparrow limits obtained for coherent, partially coherent and incoherent illuminations. It is found that shaping of the aperture along with the chosen Hanning amplitude filter is effective in increasing the resolving power of the optical imaging systems.