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SLarge numerical aperture telescope with nonlinear optical correction for distortions, designed for the remote seff-luminous object imaging, was realized in experiment and investigated. Dynamic hologram, recorded in optically addressed liquid crystal spatial light modulator, was used as the corrector. Nearly diffraction limited performance of the system was demonstrated.

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This letter deals with the physical interpretation of the 'transitional amplitude' AE, a parameter of percolation theory determined by the derivative mean size of clusters s: AE = x(ds/dx) +s; AE = s( 1 + LR) = where E = xx,, and LR is the average number of red bonds in an incipient infinite cluster.

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Described are the methods of numerical design and simulation of observational telescopes, using the thin (plain) dynamic hologram as the corrector for image distortions, imposed by the primary mirror surface defects.Hologram application to compensation for distortions of the primary mirror of imaging telescope was first proposed and realised by Yu.N.Denisyuk and S.I.Soskin [1,2] (Fig. 1). In these works the conventional static hologram of distortions of primary mirror was registered on photoplate, using the auxiliary scheme, working from this mirror centre of curvature. This hologram was then processed and mounted in the focal unit of the telescope. Such a scheme did not cope for dynamic distortions and was rather hard to be aligned and adjusted. So until recently this approach was used in practice only for correction for the regular aberrations of the system of Zeidel kind.

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