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

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.