A simple optical path for fabricating photonic crystals is presented. It is convenient to change the number of beams and its angles. Then photonic crystals of different lattices can be gotten. Recording
material is home-made water-resisting photopolymer. The fabrication of photonic crystals with holography is simulated by matlab. By changing the number of beams and its angles, triangular, square
and circular structures of photonic crystals are obtained. When polarization states of beams are changed, photonic crystals of different refractive index modulation are obtained. Via the simulation, the refractive index modulation of linearly polarized light is the highest. In the experiment, different exposures are set. And the best exposure is 20s, which is less than before. In this paper, photonic crystals using four light beams and five light beams are fabricated. Then, compare simulated results with experimental results and they are in substantial agreement.
No-glasses optical grating stereoscopic display is one of a chief development of stereoscopic display, but it is always confined by the range of stereoscopic visible and quantity of stereoscopic information
and quantity of users. This research use the combination of Fresnel lens array and controllable point
lights to output information of the two eyes of different users separately. Combining the technology of
eyes-tracking, it can make no-glasses optical grating stereoscopic display be visible in 3D orientation
range by multiuser in the condition of two-angle image sources. And it also can be visible in 360°
stereoscopic overlook by one user in the condition of multi-angle image sources.
We explored the reaction mechanism of the dual-wavelength water-resisting photopolymer. The
photosensitive material which was sensitive to red and green light was synthesized, using the complex
photo sensitizer. The photosensitivity was improved and the scope of the photosensitive spectrum
was broaden. We also studied the influence of the ingredient on the holographic performance of the
polymeric material. Further studies on the influence of the solution preparation on the quality of the
hologram was made, too. The appropriate exposure time and disposal way were obtained through
experiments. The experimental result indicates that this hologram of the dual-wavelength water-resisting photopolymer is damp-proofing and non-active. It is easy to preserve in any
environment. It needn't chemical treatment to manufacture hologram applying this prescription. The
diffraction efficiency would be increased obviously by heating. Providing ideal storage material to the
manufacture of the holographic element, the prospect of the appplications would be more extensive.
The holographic storage characteristic of a new kind of water-resisting photopolymer is studied; and studied it's photoperceptivity and application in many aspects. The photopolymer is composed of two
dyes which is sensitive to red and blue wavelength. This kind of photopolymer is water-resisting and its
post retreatment is simple. The volume shrinkage mass of this material is also small. We have used this
material to make gratings successfully; we settled the problem of spreading this photopolymer to soft film for storage.
Resole and novolac are the coating resins of the CTP (Computer to Plate) thermal cross-linking plate and their characters directly determine the light sensitivity of the plate. In this paper, these resins were studied, and experiments showed that when the novolac's molecule weight is about 5000, the light sensitivity and the quality of the plate are the best. The optimal conditions of synthesizing resole were obtained, and more experiments were attempted to improve the light sensitivity of the plate through altering the proportion between the two image resins.
The basic starting point of the digital hologram’s image-forming system is to employ two-dimensional medium for expressing three-dimensional image or recovering three dimensional objects. By virtue of the computer coding technology, we reconstruct object’s reproduction image, and use red-sensitive photopolymer to make hologram. In this paper, we discuss two record devices, that is, the Charged Coupled Device and the digital camera. We mainly focus on two kinds of spatial light modulator, and choose one to project images. As for the holographic record material, we use a sort of self-made photopolymer, which is a contamination free record material. In the experiment, we have received certain fine results.
Water-resisting red-sensitive photopolymer with simple reprocessing has high sensitivity, high diffraction efficiency (>80%) and large refractive index modulation. Sensitivity and resolution is increased by using compound spectral sensitization compound coinitiator and compound monomers. The polymerization of the monomer can be controlled, and so the holograms preserved in the natural environment for a long time do not disappear. The photopolymer holographic recording materials without hidden reaction have good physical and chemical stability. The result of research indicates that the holographic recording plates have better real-time character. The photochemical polymerization mechanism and the effects of the components on the photopolymerization rate are investigated, and other characteristics about this material are also analyzed. In addition, the photopolymer is harmless and pollution-free, and so the photopolymer has large practical value and prospects of wide applications.
In this paper, a blue-sensitive photopolymer holographic recording material was prepared. The visible-light sensitive photoinitiating system was composed of sensitizer, initiator, hydrogen-donor, monomer and binder. Compound sensitizing as a new method for improving exposure sensitivity of this material was proposed. Experiments results indicate that compound sensitizing significantly increased the exposure sensitivity from about 55mJ/cm<sup>2</sup> to 40 mJ/cm<sup>2</sup>, while without any affection to the maximum obtainable diffraction efficiency. More than 85% of transmission grating diffraction efficiency can be attained as a very simple post process was performed. Mechanisms of polymerization and hologram formation were discussed. The holograms, with a good physical and chemical stability under ambient circumstance, have much potential in optical communication, such as filters and switches.
In view of some problems of the thermal cross-linking CTP plate previously prepared in our laboratory, an acid proliferation generator was synthesized and used in the preparation of CTP plate. Therefore, the sensitivity and imaging quality of CTP plate was improved obviously. This kind of plate has an imaging layer, comprising an admixture of a resole resin, a novolac resin, a latent Bronsted acid, an acid proliferation generator, an infrared absorber and colorant. The plate is intended for digital exposure with an infrared laser with 830nm in a computer to plate (CTP) machine. The dot density of the printing plate ranges from 1 to 99 percent, and the resolution can reach 6μm. On the aspect of making printing plate these characteristics achieve acceptable criterion of printing.