We discuss different holographic materials for thick holograms recording. For material selection we apply various holographic and technological factors. Chalcogenide glasses have good optical properties, low scattering and high resolution for IR application. Dichromated gelatic film and thick layer-gel of dichromated gelatin may be used in visible green-blue light, but these holograms are unstable. Photo polymer PMMA - for hologram recording in visible light we used as base material, which has high holographic quality and good stability. We discuss the synthesis of material and describe the method of latent image for selection of optimal composition and additives. We use the molding method for production of high quality surfaces. A special recording scheme allows the material to record large size elements with highly reproducible parameters. It is shown that in order to obtain highly uniform elements it is necessary to maintain the very strict control of synthesis process. Application of this technology is discussed.
We discuss the color hologram of the human object and previous works with monochromatic reconstruction. A two step method of recording the hologram with reconstruction in white light was suggested in 1975 for monochromatic reconstruction of the image. The transmission hologram with low noise was the first step of this recording. In first experiment we used photo plate 8E75 with bleaching for recording of H1 holograms. Selection of recording materials using signal and noise characteristics is shown. The original method of producing low-noise holograms (SHSG process) for H1 process is discussed. The reflection hologram H2 was produced as the second step. For copying of H1 hologram onto H2 hologram in the first experiment we used He-Ne laser and photo plate PE-2, produced in laboratory (predecessor of plate PFG-03). We will discuss different optical setups for recording H1 and H2 hologram. New problems connected with recording color holograms. In first our work on modeling color holograms was used a method of emulsion thickness manipulation in between exposures and He-Ne laser, then system silver halide -- dichromated gelatin and original silver halide materials with color sensitizing. Characteristics of SHSG process for color silver halide materials are shown. Finally simulation recording color hologram and possible applications demonstrated.
We discuss the properties of thick holograms on dichromated gelatin (DCG). We consider the synthesis of this material and describe the method of latent image for selection of optimal composition and additives. Thick gel of dichromated gelatin may be used in visible green-blue light, but holograms are unstable. We discuss optical properties of thick hologram on DCG. Control of the parameters and stabilization of this media is essential. Recording schema has been developed which permits receiving holograms with highly reproducible parameters. Application of this technology is discussed.
We discuss different materials for recording thick holograms and holographic elements. For material selection we apply various holographic and technological factors. Chalcogenide glasses have good optical properties, low scattering and high resolution in application for IR. Thick gel of dichromated gelatin may be used invisible green-blue light, but holograms are unstable. For hologram recording in visible light we use a polymethylmethacrylate - based material, which has high holographic quality and good stability. We consider the synthesis of this material and describe the method of latent image for selection of optimal composition and additives. We use the special molding method for production of high quality of surfaces. Our recording scheme permits receive large size elements with highly reproducible parameters. To obtain highly uniform holographic elements, very strict control of synthesis process is necessary. Application of this technology is discussed.
In this paper, we discuss our most recent work in 2D nonspatial filtering. A brief introduction describes nonspatial filtering and its relationship to conventional spatial filtering. We then show result from our initial experiments in 2D nonspatial filtering and briefly describe a more advanced design. A variation on the more advanced design demonstrates wavelength-independent operation. We then review our initial findings on adhesives appropriate for implementation of the advanced design and comment on the surface quality requirements of the recording material, a polymer with diffusion amplification. Finally, we compare the robustness and efficiency of nonspatial filters with conventional spatial filters.
Discussed the system of holographic disc memory. This memory uses the overlapping expanded partial holograms on the moving disc and collinear optical heterodyning for data readout. Discussed the requirements to holographic materials for realization of this system. By selection of materials we used the signal and noise characteristics for different materials (silver halide, dichromated gelatin etc.). By development of materials we used the method of registration latent holographic images. Discussed the technological problems by realizing of materials and holographic memory. The experimental results are demonstrated.
The methods of investigation of the microstructure and dispersion structure of holograms using different physical and chemical methods, including mercury porosimetry, optical and electron microscopy, X-ray micro analysis and investigations of latent images, are discussed. The theory of formation of holographic structure in the layers on bases of investigation of their micro structure is analyzed. The possibility of wavelength correction of reflection master- hologram by means of physical and chemical methods is shown. Hologram processing at supercritical condition of temperature and pressure, which may reduce the destruction of the microstructure of hologram from considerable Laplasian forces, is discussed. Our results of using improved layers of the dichromated gelatin for recording and processing of holograms and master-holograms are reviewed.