Computer-generated holography using complex interference patterns

Tsutomu Horikoshi; Takaaki Akimoto; Kazuhito Higuchi; Satoshi Suzuki

doi:10.1117/12.303664

18 March 1998 Computer-generated holography using complex interference patterns

Tsutomu Horikoshi, Takaaki Akimoto, Kazuhito Higuchi, Satoshi Suzuki

Proceedings Volume 3293, Practical Holography XII; (1998) https://doi.org/10.1117/12.303664
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States

Abstract

This paper introduces a scheme whereby complex holography is realized as computer generated holograms. Complex holography is based on the complex amplitude of the wavefront using an additive representation of a real part and imaginary part. Two types of hologram are needed, but no conjugate image is produced. Conventional holography can avoid the effects of conjugate images only by using a display/recording device with very high resolution, but this solution is not available to electro-holography. The conjugate image, which is always generated from the original image simultaneously, makes the reconstructed image very noisy. Complex holography involves decomposing the complex value of each pixel into the real and imaginary parts of the pattern. Each interference pattern is displayed on a different display device, and illuminated by coherent lights. At this time, the coherent lights differ only in terms of phase, the phase difference is (pi) /2 radians. The summation of the two diffraction patterns regenerates the complex wavefront while eliminating the conjugate object light wave-front. This paper first mathematically confirms the principle of the proposed method. Next, experimental simulations in which synthesized images are clearly reconstructed are described. In addition, an experimental system is demonstrated that uses two LCD panels.

Citation Download Citation

Tsutomu Horikoshi, Takaaki Akimoto, Kazuhito Higuchi, and Satoshi Suzuki "Computer-generated holography using complex interference patterns", Proc. SPIE 3293, Practical Holography XII, (18 March 1998); https://doi.org/10.1117/12.303664

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