Proceedings PaperPerformance Of Optical System Employing Polarisation Masks Under Partially Polarised Light Illumination
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It sometimes becomes necessary to modify the imaging characteristics of an optical system to achieve better performance for certain applications. In the present paper, the modifications in the imaging characteristics achieved by employing linear and circular polarisation masks at different zones of the optical system is considered. This modification technique is comparatively easy to realise into practice and is based on the principle that if the pupil transmission function of an optical system is made polarisation dependent, then the contribution to the diffraction pattern from different zones will be different. In case of linear polarisation masks, apodisation has been achieved by placing linear polarisation masks at different orientations in the zones while for circular polarisation masks, it is achieved by placing circular polarisation masks with different attenuation ratios. Moreover with an analyser at the image plane, the performnce may be continuously modified.