A holographic setup as for a usual "open aperture" hologram was employed using a lateral reference beam incident at 450, a 35mm photographic objective f=50mm , f:1.4 imaging small objects with a x1 magnification. The size of the image corresponded to the standard format for 35mm photography. A horizontal slit 3mm high was placed close before the objective. AGFA 8E75 holographic film was employed. When projecting, we substituted the original objective for another one, f=135mm, in order to obtain a larger distance from the hologram to avoid reflection of the transmitted beam at the inner of the projecting lens. We illuminated by means of a 300 W halogenous lamp. Fig.2 is a stereo photographic pair of the scene registered with a camcorder 8mm SONY video camera digitized by means of a TARGA+64 video card. It is shown in the format left view - right view - left view (L-R-L) so that the observer whho wants to see it stereoscopically can choose the LR sequence for parallel observation, or RL for crossed observation. A 20% of lateral compression was performed to better fit the figure into text. The size of the holographic screen, a little larger than the size of the image, is 0.75m (H) x 1.14m (V) .

Figure 2: Stereo photographic pair of an enlarged hologram.

Conclusions.

We demonstrate the possibility of obtaining bright enlarged holographic images, an important step toward the development of holographic cinematography and for the reduction of size, weight and cost of holography. Although the method may be limited to small objects due to the difficulty in obtaining large aperture objectives, it is known that Komar and Serov5 could register the hologram of a person through such objectives.

Acknowledgements.

The author acknowledges to the National Council of Research - CNPq for the fellowships they received at the Senior and Student level, to the Foundation of Assistance to Scientific Research of the São Paulo State - FAPESP for the supporting of this project.

References.

[1] J.J. Lunazzi, Proc.of the SPIE meeting "Electronic Imaging", conference "Practical Holography VI", San Jose-CA-U SA, 9-14 Feb.1992, p.289-293.

[2] Private communication to E. Leith, F. Baumstein and M. Baumstein, 10 Oct. 1990 .

[3] J.J. Lunazzi, P.M. Boone, Opt. Lett.15 Nov.1994 p.1897-1899.

[4] J.J. Lunazzi, P.M. Boone, Proc. of the International Symposium on Display Holography, Lake Forest, 15-18 July 1994, p.449-453.

[5] V.G.Komar and O.B.Serov, Proc. of the "Holography '89" Intl.Conf., Y.N.Denisyuk, T.H.Jeong eds., SPIE, V1183, p.170-182 (1990).