**7. References**

Smith H. (1975). *Principles of holography*, second edition, Johnm Wiley & Sons. Bjelkhagen H., Thompson B. (1996). *Selected papers on holographic recording materials*, Vol. MS 130, SPIE Optical Engineering Press, Bellingham, USA.

In order to compare our photosensitive material, we use the SO-253 film from Kodak to make the Fourier hologram of the text and the reconstructed real image is show in Fig 25 It is important to note, that the amount of text in Figs. 24 and 25 are different because we use 1 inch of diameter lens in one optical setup and 2 inch of diameter lens in the optical setup used in order to illuminate the photosensitive material. Another difference is that the SO-253 film has its sensibility at the line λ=633 nm so we record the Fourier hologram with this

The advantage of Fourier holograms is that the storage area is small compared with Fresnel holograms and we can apply some multiplexing technique to optimizing the storage area. In table 6 we show the diffraction efficiencies of the holograms showed above measured for the

Hologram Photosensitive material Diffraction Efficiency (%)

We present a photosensitive material composed by Norland Optical Adhesive No. 65® mixed with crystal violet dye with a high potential for recording holographic elements in real time, in this work we can emphasize some important characteristics of this material, eg: the phase holographic gratings are refraction index modulated, it is of low resolution; as is expected, a major sample thickness diffraction efficiency is increased, the beam intensity ratio must be 1:1 to obtain a best behavior of gratings. Also we noticed that the room temperature plays an essential role for the registry of holograms, that is to say, temperatures majors to 25 ºC and minors to 24 ºC its efficiency of diffraction are smaller, finally we have

Bjelkhagen H., Thompson B. (1996). *Selected papers on holographic recording materials*, Vol. MS

UMSNH logo NOA 65 and CV 0.11 Text hologram NOA 65 and CV 0.16 Text hologram SO-253 Kodak 1.00

wavelength and we use the same wavelength to reconstruct the real image.

Fig. 25. Real image of hologram stored in SO 256 film from Kodak.

Table 6. Diffraction efficiencies for hologram reconstruction.

recorder Fourier holograms of binary objects in real time.

Smith H. (1975). *Principles of holography*, second edition, Johnm Wiley & Sons.

130, SPIE Optical Engineering Press, Bellingham, USA.

+1-diffracted order.

**6. Conclusions** 

**7. References** 


**Light-Sensitive Media-Composites for** 

**Glass and Polymer** 

*Russia* 

O.V. Andreeva and O.V. Bandyuk

**Recording Volume Holograms Based on Porous** 

*The National Research University of Information Technologies, Mechanics and Optics* 

Volume holography, or holography in three-dimensional media, dates back to Yu. N. Denisyuk's works (Denisyuk, 1962), who implemented the idea of hologram recording in a three-dimensional medium by means of recording a hologram in counterpropagating beams, using traditional silver-halide light-sensitive materials. Adaptation of traditional photomaterials for purposes of image (pictorial) holography consisted in reconstruction of Lippman photographic layers with the size of light-sensitive grains less than 25 nm and use of photochemical processing techniques that allow obtaining amplitude-phase high-efficiency holograms in the visible region (Denisyuk &

Three-dimensional holograms with Klein parameter (Q) that describes the degree of threedimensionality of a hologram grating on order of 10 (Kogelnik, 1969), obtained on traditional photomaterials of thickness on order of 10 μm, are referred to as 3D-thin holograms. Hologram gratings with Q > 1000 are commonly considered 3D-volume holograms. To meet the condition, the thickness of the recording medium should be by 2-3 orders of magnitude greater than in the case of 3D-thin holograms and amount to a value on order of millimeters. Recording 3D-volume holograms made use at different times of different recording media: crystals, photochromic glasses, etc., their main features in high demand in 3D-volume holography being large thickness and negligible shrinkage. Yet it became clear that the available media fail to meet the set of requirements placed on media for hologram recording, and foremost, for recording static holograms, intended to be used as hologram optical elements and holograms for long-term information storage. The need to develop the theoretical and experimental research in the field of volume holography called for creation of recording media of great thickness and with corresponding properties. Creating such media required new approaches to their development and corresponding measurement

The present section introduces media for 3D-volume holography, which were created on the basis of principles developed in 80s-90s of the ХХ century (Sukhanov, 1994a). The media demonstrated the potentiality of the implementation of the proposed theoretical principles of creation of volume recording media in practice and also proved conductive to refining parameter measurement techniques for volume holograms, to studying and understanding

**1. Introduction** 

Protas, 1963).

techniques for parameters.

Norland Products Incorporated, Norland Optical Adhesive 65 (1996, 1999). 695 Joyce Kilmer Ave. New Brunswick, NJ (980) 545-7828 Catalog 0906-S01, 0906-S02. **3** 
