<title>Fast CGH algorithm for the off-plane near-field computer-generated hologram</title>

Abstract

We present a fast algorithm for the off-plane near-field computer generated hologram (CGH). In this paper, we develop a fast and efficient algorithm to compute CGH data having higher resolution than optical hologram, by reducing redundant computation load. We use a moving window technique to eliminate the high spatial frequency component and to speed it up. To implement a real-time interactive CGH, one has to speed it up and reduce the computation load. So, we use pre-computed look-up table technique which contains large arrays of interference fringe patterns of possible distance point sources. To speed up further, we use the bipolar intensity and a relaxed CGH which has less resolution in vertical component than it does that in horizon one. In experiment, the computed CGH data are displayed on a liquid-crystal television spatial light modulator. We show that a 3-dimension image is reconstructed well by illuminating the laser on the hologram plate.