Abstract

A hologram is a recording medium created by holography that records and reproduces a three-dimensional object. Creating a hologram on a computer is Computer-generated holography, and a hologram created by computer holography is called a Computer-generated hologram.In this paper, the angular spectrum method which has short calculation time and can reproduce even in the short distance is used.Computer-generated hologram can be obtained by calculation on a computer, but the distribution of holograms is obtained by discrete values because computers can not handle continuous values.Therefore, sampling intervals must be taken into account. In this paper, we study and consider how the sampling interval affects when reproducing a hologram created by the angular spectrum method. As a result of the simulation, it was found that the pixel pitch has to be changed according to the distance of reproducing the hologram.

Highlights

  • Since images such as photographs recorded only the amplitude information of the original object light, information on the optical path can not be obtained

  • The amplitude hologram reproduces the original three-dimensional object by amplitude modulation and the phase hologram reproduces by phase modulation

  • We study and consider how the sampling interval affects when reproducing a hologram created by the angular spectrum method

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Summary

Introduction

Since images such as photographs recorded only the amplitude information of the original object light, information on the optical path can not be obtained. The hologram records the amplitude information of the original object light and the phase information. Computer-generated holography can make wavefronts with various amplitude and phase distributions, so holograms can be recorded for objects that can not exist. In the diffraction integral of Fresnel-Kirchhoff, the calculation time is very slow, and the hologram created by the Fresnel approximation can not be reproduced in the short distance. We study and consider how the sampling interval affects when reproducing a hologram created by the angular spectrum method

Computer-generated hologram
Complex amplitude hologram
Determination of hologram by angle spectrum method
Conclusions
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