Oleg V. Rozhkov

LC-based Phase-modulating Spatial Light Modulators

LCOS-technology is grown from display applications from one side and scientific applications from other side. The successful transition to commercial non-display applications imposes new criteria on design, production and characterization of phase-only LCOS SLM products.

Scheme and technical implementations of highly effective vector-matrix multipliers for an optoelectronic large-scale neurocoprocessor

Various scheme and technical implementations of a vector- matrix multiplier for neuronetworks design are considered. Variants of the VMM laboratory model on the basis of the traditional optics and standard optoelectronic components are worked out. Input and output vectors are realized accordingly as radiation source and photodetector matrices; weights set with the help of a projector LCD. Possibility of an integrated optical VMM implementation as a monolithic circuit is considered; peculiarity of a planar circuit working is noted. The results of circuit elements calculations and complete VMM circuit arranging with a control block diagram are presented. This neurochip is made on the GaAs substrate by means of the traditional semiconductor technology (0.35 mkm) and takes 40 X 10 mm2 area.

Optoelectronic large-scale neurocoprocessor for a microcomputer on an optical vector-matrix multiplier base

The main features of scheme and technical implementation of an optoelectronic neuroprocessor for PC are considered. The neurocoprocessor provides an emulation of the one layer of any neuronetwork (with the neurons quantity to 1000 by their absolute coherence) on the basis of a vector-matrix multiplication. Worked out system is capable of discerning of very noisy images in the time, not more than three output photodetector rise times.

Single-channel optoelectronic neuro-coprocessor based on a vector-matrix multiplier with an adjustable threshold

Single-channel optoelectronic neurocoprocessor on the base of vector-matrix multiplier with column submatrices is designed. Two models with dynamic and constant threshold are proposed for implementation. Results of pattern recognition simulation showed fast and effective convergence to the memory patterns.

High-efficiency vector-matrix multiplier for large-scale optoelectronic neuro-coprocessor

Designed circuit of the large-scale high-efficiency optoelectronic vector-matrix multiplier and its components are considered in terms of geometrical optics. The results of aberration calculation are given to show the absence of cross distortions in both cascades of the system composed of the commercially available optoelectronic elements.

Recursive algorithms in the problems of optical processing of logic information

Mathematical description and algebraic interpretation of recursive algorithm in optical binary pattern processing are carried out. The recursive optoelectronic processor configuration is described.

Recursive algorithm and optoelectronic processor for binary images processing

ABSTRACT Mathematical description and algebraic interpretation of recursive algorithm in optical binary image processing are carried out. The recursiveoptoelectronic processor configuration is described and experimental resultsare presented. INTRODUCTION Tasks of detecting and classifying objects of a certain type against thebackground of two-dimensional continuous fields often make it necessary tosolve a set of logical equations of a definite type containing a large numberof equations. Such problems can be solved efficiently with the help of high— I—4 duty optoelectronic logic matrix processors . In some cases such processorsimplement the operating algorithm to be described below. I. DESCRIPTION OF THE INITIAL ALGORITHM OF THE PROCESSOR WORKING In order to describe the initial (basic) operating algorithm of the pro-cessor, let us, first, consider the input data. Let be an input dynamic rowvector (with the inner processing cycle to be described being performed by allthe possible values k of this row vector), i.e. X(x,x ,...,x,...,x), and [B

Optoelectronic spectrum analyzers and direction finders for fast processing of coherent acoustic signals

The paper presents principles and design considerations of optoelectronic multi-module spectrum analyzers (direction finders) for fast processing of coherent acoustic signals. The results of theoretical investigations are discussed and the module design is considered for the systems implementing both amplitude-only and amplitude/phase processing of coherent low- frequency signals by means of radial and turn shearing interferometers.

Transer function of a 3-D reflective hologram

In the framework of the kinematic theory of three dimensional holograms an analytical expression for the impulse response of a 3-D reflective hologram in a paraxial approximatation has been obtained. The problem of applicability of the transfer function concept to a 3-D reflective hologram has been studied and it has been shown that even in a paraxial domain this hologram can he regarded as a space-invariant system only at small deviation from the Bragg condition. The analytical expression defining the transfer function of a 3-D reflectiye hologram has been derived for this case. The formulae obtained allow to rapidly evaluate the quality of the reconstructed image.

Gray level distortions induced by 3-D reflective hologram

In the framework of the coupled wave theory the dependence of the light intensity distribution in the holographic image of an extended object on the Bragg angle mismatch has been found for the phase-amplitude 3-D reflective hologram the intensity distribution across the object being arbitrary. The grey level distortions induced by this hologram have been evaluated depending on the observation point position with respect to the hologram and the reconstructing source. 1 .