Speckle interferometry with ring aperture

Summary form only given. Theoretical and experimental investigations of operation of the optical instruments, such as reflecting telescopes and the mirror objectives, have shown, that the availability of a ring aperture in them allows to increase their resolution (Born & Wolf, 1970). Therefore, the aforementioned fact represents theoretical and experimental interest for research applications of the ring aperture in the speckle interferometry. In this paper theoretical and the experimental studies of application of the ring apertures in the optical system for registration of the specklegram are presented. Theoretical studies show that if a size of width of a ring of the ring aperture is small the light intensity distribution in the diffraction halo and in a speckle structure is described by Bessel function of the zero order (J/sub o/).