V. Yu. Venediktov

Asymmetrization of the profile of a dynamic holographic grating on the basis of particularly local information

A new algorithm for digital transformation of an interference pattern (in particular, fringe profile asymmetrization) is proposed. This algorithm is based on the use of particularly local (point-to-point) information. Its validity is confirmed in a model experiment.

Polychromatic dynamic holographic one-way image correction using liquid crystal SLMs

The paper describes the results of experimental study of real time dynamic holographic correction of lens distortions in a model telescope, imaging a remote object in incoherent non-monochrome radiation in the visible range of the spectrum. Dynamic correction in the scheme of one-way imaging was provided by the thin dynamic hologram of the lens distortions, recorded in the optically addressed liquid crystal spatial light modulator.

Correction of segmented mirror aberrations by phase conjugation and dynamic holography

A novel approach is proposed for using the phase conjugation phenomenon for dynamic correction of distortions in beam forming laser systems. The method is based on the well-known application of a special diffraction structure on the surface of corrected optical elements ensuring nonreciprocal beam propagation in a system including a phase conjugate mirror. The main feature of the proposed approach is that it uses the diffraction structure which is not static (as usually) but is written dynamically by a small auxiliary laser source irradiating the corrected element surface simultaneously with the working beam. This makes it possible to extend the capabilities of the known method with respect to scaling-up the size of compensated mirrors and allows replacement of a large solid mirror by a segmented one. The novel method of correction has been tested experimentally by the use of 1.06 μm radiation for recording the dynamic hologram and a 10.6 μm laser beam as the working beam, distorted by a two-segment mirror with a dynamic hologram on its surface and corrected by a phase conjugate mirror. The means of dynamic hologram recording in different spectral ranges are discussed.

A method of fast building of locally equidistant distributions of geometrical objects of illumination systems

We have considered general principles of the calculation of lightguiding illumination systems with scattering microstructures and proposed a highly efficient method of building of locally equidistant distributions of microgeometrical objects with a specified density. The developed technique makes it possible to eliminate the Moiré effect in illumination systems with LED lighting. The algorithm of the method has been described. The work is illustrated by examples of calculation of illumination systems of a LC display.

Optical system for measuring the relative position of two planes

This paper discusses versions of the creation of an optical noncontact sensor for measuring the relative position of planes. By computing the center of gravity of a light spot from a reference source, the displacement of the planes relative to each other is calculated.

On the possibility of applying kinoform elements in mirror projectors for EUV lithography

The potential of the technology of reflective diffraction (holographic) optical elements intended for the EUV range is considered, and their application in projection lithography is discussed.