Abstract

Holographic correction for telescope lens distortions was first proposed and realised yet in 70-es¹; in this and more recent experiments² the holograms were recorded in the static media, providing thus correction only for static distortions. The prospective scheme, which can be used for real-time dynamic correction in wide spectral range, uses thin (plain) dynamic hologram record in the optically addressed liquid crystal spatial light modulators (OA LC SLM). In the experiment we have evaluated wide spectral band imaging by model telescope with the distorted primary lens of the standard test object, irradiated by the tungsten lamp radiation Dynamic hologram was recorded by pulsed radiation at 0.54 μm in OA LC SLM with polymer photoconductor and nematic LC layer. Auxiliary static holographic grating compensated for the dynamic corrector chromatism. In the Figure: (a) - image by non-corrected telescope with distorted by etched glass (extra divergence 6x10^-3 rad) primary lens, (b) - corrected image, (c). (d) and (e) - central zone of corrected images, recorded under one and the same experiment conditions by radiation in the band 0.53 ± 0.4 μm - (c), 0.63 ± 0.4 μm - (d, one can see image deterioration due to incomplete compensation at the shifted wavelength) and by white light (e, interim quality between cases c and d).

© 1998 IEEE