| 摘要: | 研究期間：10108~10207;Generally speaking, multiplex holography is a 3D-display method which combines photography (real or artificial) and holography (rainbow holography or reflection holography). In principle, the subjects which can be used for holographic recording is no longer limited to those which can be placed on the optical table. Not only human beings or outdoor scene, but also the scientific, engineering, medical or artistic data can be utilized for holographic recording. Hence, multiplex holography is a good candidate for 3D display. In the investigation during the past many years, we have developed an impressive type of holography called “Image-plane disk-type multiplex holography”, which enables observers around the hologram disk to perceive a 3D image simultaneously. A system with which dynamic 3D image can be generated is also suggested[1]. Although disk-type hologram is walk-around viewable and possesses wide vertical viewing angular range due to light dispersion, however, when the observer moves his eyes up and down, he can only perceive the same image, i.e., there is no vertical parallax. In this project, we would first make conical hologram to retain the vertical parallax of the 3D object and then retrieve the information to make a reflection disk-type hologram (or walk-around viewable planar hologram). Owing to the wavelength selectivity of the reflection hologram, the clarity of the reconstructed 3D image can be enhanced. In the future, with information of three primary colors, we can further make walk-around viewable color hologram which also possesses vertical parallax. In this investigation, the polarization direction and amplitude of the object wave reaching the whole conical surface of the recording film are not the same. In order to produce more uniform interference fringes for holographic recording, we would adopt scattering medium of suitable size in the object beam and possibly also in the reference beam. In this way, the diffraction efficiency from the final disk-hologram may be optimized. The proper parameters for the whole holographic process will be investigated. On the other hand, in the past, we have proposed the transmission-type “image-plane conical-type multiplex holography”[2], which eliminates the so-called “picket-fence effect” occurred in the multiplex hologram recorded in the traditional way. In order to generalize to color conical multiplex holography with wide vertical viewing range, wavelength selectivity from thick recording media is required. In this project, we would adopt astigmatic optical systems for both the object wave and the reference wave to compensate for the effect of bending of hologram into a conical shape. In this way, reflection “image-plane conical multiplex holography” may be achieved. Then, we will use a reference wave which is diffracted from a slit on a scattering medium to extend the vertical viewing range for the “reflection-type image-plane conical multiplex hologram”. If this step is successful, we will then investigate toward reflection-type conical multiplex hologram which can generate real image simultaneously for the surrounding observers. |
