Proceedings of Topical Meeting on Optoinformatics (pdf-format, 1.21 ...

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38 OPTOINFORMATICS’05 Once obtained the base films with the solution 1, the process <strong>of</strong> storage realized for the reply <strong>of</strong> digital holograms. The conditions in which the process was realized, was under normal conditions <strong>of</strong> laboratory it is 22 o C - 25 o C, relative humidity ≈ 35%-40, is important the dampness that is obtained in the films in the moment to be storage. Using a mask master [3] , the temperature that generates in the friction process was about 35 o C ≈ 38 o C. Holographic recording in this material (PVA) is the base on the polymerization [5] . The polymerization was realized by two processes <strong>of</strong> activation, the heat (thermo treated) and radiation (photo treated). The process finishes with the polymerization <strong>of</strong> the films realizing it for three methods; in muffle, radiation with UV and radiation with incandescent lamp. To record optical information in any material, photons must be absorbed by that material and cause chemical changes. These are primary photochemical reactions and can be described by the first and second law <strong>of</strong> photochemistry [6] . For what the process <strong>of</strong> drying <strong>of</strong> the holographic recording is varied, determining the diffraction efficiency regarding the time <strong>of</strong> exhibition for each case, that can be observed in the graph 1. 100 90 80 Muffle UV radiation Lamp Diffraction Efficiency % 70 60 50 40 30 20 ( a ) Figure 1. Appearance <strong>of</strong> the film for solutions 1 and his pattern result <strong>of</strong> processes <strong>of</strong> storage 10 0 5 10 15 20 25 30 35 40 45 50 Dried time (minutes) Graph 1. Diffraction efficiency for three different dried methods We observed that, the number <strong>of</strong> obtained orders and the quality visual <strong>of</strong> these, are determined by the type <strong>of</strong> dried obtained to final process in the holographic register [7] . The thickness film <strong>of</strong> the polymer, the quality <strong>of</strong> the mask master and the time <strong>of</strong> friction in the storage are determinant factors for the reply <strong>of</strong> the master. We leave these constant factors in the process changing the time <strong>of</strong> exhibition to the radiation in every sample. Although many factors intervene in the modulation process <strong>of</strong> holographic recording, we realize the control and record <strong>of</strong> three factors were repeatable and reproducible. 1. Available . 2. Available . 3. W.S. Colburn, Review <strong>of</strong> materials for holographic optics, J. Imag. Sci. Technol., 41, p. 443, 1997. 4. S. Blaya, L. Carretero, R.F. Madrigal, A. Fimia, Optimization <strong>of</strong> a photopolymerizable holographic recording material base don polyvinylalcohol using angular responses, Optical Materials, 23, 529-538, 2003. 5. S. Blaya et al., Appl. Opt., 25, p. 7604, 1998. 6. V. Weiss, A.A. Friesem, and a. Peled, Inorganic Materials for archival holographic recording, J. Imag. Sci. Technol., 41 (4), p.355, 997. 7. John R Dyer, “Aplicaciones de espectroscopia de absorción en compuestos orgánicos”, first Ed. Prentice Hall Internacional, New Jersey USA, 1973.
SAINT-PETERSBURG, October 17 – 20, 2005 39 NANOPOROUS SHRINKPROOF MEDIA FOR RECORDING AND STORAGE OF INFORMATION N.V. Andreeva, A.P. Kushnarenko*, O.V. Andreeva** Saint-Petersburg State University <strong>of</strong> Information Technology, Mechanics and Optics, 49 Kronverkskij ave., St. Petersburg, Russia, 197101 *Saint-Petersburg State University, 1, Uljanovskaja str., Petrodvorets, St. Petersburg, Russia, 198504 **S.I. Vavilov State Optical Institute, 12 Birzhevaya linija, St. Petersburg, Russia, 197198 E-mail: klub-optoinf@yandex.ru, AndreevaNV_3@mail.ru The results <strong>of</strong> researching shrinkpro<strong>of</strong> silver halide photomaterials on basis <strong>of</strong> nanoporous glasses are reported. Volume recording media which were developed in State Optical Institute for the aims <strong>of</strong> volume holography find their applications in different scientific and technological activities. [1] Properties <strong>of</strong> these materials open new opportunities <strong>of</strong> their using that overstep the limits <strong>of</strong> application recording media only for holography. Recording media for holography with the thickness about 1 mm should be shrinkpro<strong>of</strong>, have a sensitivity to the spectrum <strong>of</strong> coherent radiation sources which are in existence, allow the opportunity <strong>of</strong> nondestructive reading and information storage, not change their parameters during long exploitation and etc. Silver halide composition with gelatin as a protective colloid supplies the photosensitivity <strong>of</strong> porous silver recording medium. [2] Up to now photographic silver media for totality <strong>of</strong> parameters stay unexcelled light-sensitive materials in different fields <strong>of</strong> contemporary scientific and technological activity. Porous silver halide photomaterials add one more opportunity to the list <strong>of</strong> major parameters <strong>of</strong> silver halide photomaterials – the opportunity <strong>of</strong> getting shrinkpro<strong>of</strong> samples which allow post-exposure development by chemicophotographic solutions. Such an opportunity supplies solid-state crystal carcass – porous glass which physical-chemical strength is close to the strength <strong>of</strong> silicate glass. Light-sensitive composition <strong>of</strong> volume porous photomaterials represents a hardphase covering which is hard connected with silica carcass internal sides and occupies only part <strong>of</strong> pores free volume and it supplies the access <strong>of</strong> reagent solutions inside the sample during its chemico-photographic development. At present time the main principles <strong>of</strong> carrying out the synthesis <strong>of</strong> light-sensitive composition are developed and the conditions were emerged too by variating <strong>of</strong> which we can change characteristics <strong>of</strong> receiving photomaterials and holograms recorded on them.
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