Holographic screen to project a 3D image by the method of point-focused aspects

A holographic screen that makes it possible to display 3D images by the method of point-focused aspects (of a scene to be displayed) or by projecting narrow line holograms is suggested and implemented. The image thus formed reconstructs only horizontal parallax, which allows one to cut the body of information necessary for 3D imaging. Projection through the screen and a way of recording the screen are considered.     

On-axis diffuse directional screen based on a transmission Gabor hologram

Holographic single-component diffuse screens based on on-axis transmission holograms are studied theoretically and experimentally. The configurations of extra holographically reconstructed images of the diffuse screen (conjugate image, halo, and zeroth-order spot) are analyzed. A so-called centered hologram is suggested in which the conjugate image of the diffuse screen spatially coincides with the main image, thereby eliminating distortions inserted by the conjugate image. Also, hologram recording using a Mach-Zender interferometer is suggested and implemented. Such an approach makes it possible to eliminate the shadow of an object on the hologram. It is noted that, in recording a planar diffuse screen, the presence of the halo does not distort the image of an object projected through the screen: only the light intensity is partially lost. Analysis of the images projected shows that the luminance of the zeroth-order spot, while relatively low, should be diminished in one way or another.     

On-axis diffuse screen based on a reference-free volume hologram

A new type of hologram that elaborates upon the simplest (Gabor) on-axis hologram is suggested. The new approach makes it possible to eliminate the projected image distortions typical of the Gabor hologram. Specifically, based on a reference-free thick hologram, an on-axis holographic screen that does not transmit the zeroth order is prepared. In addition, this screen does not produce a halo and the conjugate image. It allows for recording in one spectral range and reconstruction in another, thereby greatly simplifying the choice of a light-sensitive record medium. With this screen, a color image can be projected.     

The Application of Heat Treatment in the Formation of Relief-Phase Holographic Structures on Dichromed Gelatin

Optics and Spectroscopy - A new method of formation of relief-phase holographic structure on dichromated gelatin (DCG) layers has been proposed. The method is based on two types of alternative...     

Investigation of protein mass transfer by real-time holographic interferometry

Based on holographic interferometry data for electrophoresis and diffusion, an algorithm for quantitatively analyzing protein mass transfer in gels is suggested and implemented. The diffusion coefficients of a number of proteins in different media are found.     

The Effect of Short-Wave UV Radiation in Recording Holographic Structures on Gelatin-Containing Recording Media (Overview)

The paper analyzes the SERS spectrum of hydroquinone adsorbed on nanoparticles of titanium dioxide (TiO₂). It is seen that the enhancement is stronger for a larger mean size of nanoparticles that is in agreement with an electrostatic approximation. In addition, it is found that there are the lines, which are forbidden in usual Raman spectra. There is also an enhancement caused both by the normal and tangential components of the electric field. This result is in agreement with the theory of SERS on semiconductor and dielectric substrates. The discovery of the forbidden lines indicates on the sufficiently large role of the strong quadrupole light-molecule interaction in such a system.     

Imaging properties of a 2D crossed holographic grating on silver halide photoemulsions

A technique is proposed for photochemical processing of photoemulsions, which makes it possible to form lens-shaped focusing elements at the nodes of crossed 2D holographic gratings (2DHGs). The results of experiments on 2DHG recording performed on PFG-01 material using this technique show considerable improvement of imaging properties of 2DHG.     

Formation of random and regular relief-phase structures on silver halide photographic emulsions by holographic methods

The formation of diffusers and microlens rasters on silver halide emulsions by holographic methods is considered. Two techniques for converting amplitude holographic recording to relief-phase recording, selective curing and irradiation of the emulsion gelatin by short-wavelength UV radiation, are compared.     

Yu. N. Denisyuk’s ideas in the development of holographic methods of obtaining and projection of images

The main investigations carried out by Yuri Nikolaevich Denisyuk at the Ioffe Institute of the Russian Academy of Sciences have been presented. His investigations were aimed at developing methods of recording and projecting three-dimensional images in order to reduce the volume of information contained in the images for use in optical computers, optical interconnections, and displays.