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3 Optica Applicata

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Fourier transform holographic storage

100%

Andruchów A.

Optica Applicata

2004

tom Vol. 34, nr 4

635-645

Holographic optical elements for Fourier transform (HOE-FT) used in the optical memory system are considered in this paper. The determination of the optimal page composer capacity allows for the appropriate choice of the diameter of HOE-FT as well as the size of a hologram recorded in the fotorefractive crystal LiNbO3:Fe, with the help of two different wavelengths of the laser light beam. When the interfering field is recorded in the HOE-FT structures, properties of the recorded spectru are established. The proper choice of the phase function coefficients allows aberration to be corrected on the basis of spotdiagrams obtained.

Holographic elements for Fourier transform

63%

Jagoszewski E. , Andruchów A.

Optica Applicata

2004

tom Vol. 34, nr 1

63-75

Problems of designing the holographic Fourier transform elements are described. First, two different configurations for a Fourier transform setup are considered. The converging beam Fourier transform (CB-FT) is simpler than the conventional parallel beam Fourier transform (PB-FT) setup, and it appears that it should be preferred in ordinary cases. But the advantage of the conventional configuration is to make the Fourier plane free of the spherical factor. In order to obtain an exact Fourier transform, the design of holographic lens is described with respect to its optimization. A major problem is to eliminate possibly all aberrations, especially distortion for high values of spatial frequencies, threrefore we have shown the advantage of curved holographic element which could be applied to Fourier transform operation

Selected problems in holographic memory design

51%

Andruchów A. , Jaskółka A. , Jagoszewski E.

Optica Applicata

2003

tom Vol. 33, nr 4

591-603

The paper concerns the design of a holographic memory system. The results obtained are based on the ray tracing in the optical system proposed. The recommended memory material is LiNbO3 crystal doped with iron. The main task is to obtain maximal packing density using the techniques of both spatial wavelength multiplexing and spatial angular multiplexing.