| 摘要(英) |
Conventional multiplex holograms are composed of a series of long-thin individual holograms, resulting in so-called picket-fence effect and aberration on the 3-D image. The image-plane technique in hologram formation alleviates this aberration and picket-fence effect on the reconstructed image. In order to make the image-plane cylinder-type multiplex holograms possible, we adopt the “four-step experimental setup”. In the first step for master hologram fabrication, a diffuser is added into the optical system to increase the vertical viewing window. Then, all the 2D images retrieved from the master hologram are sequentially recorded onto the second master hologram using multiple-exposure procedure. Next, we adopt a collimated wave as the reconstruction reference beam to control the direction of the image wavefront from the second master hologram. In the fourth step, all the 2Dimages are recorded on the transfer hologram using a cylindrical reference wave. After bending the transfer hologram into a cylinder, the source line of cylindrical reference wave for hologram recording is compressed into a point on the axis of our cylindrical hologram. A white-light bulb can then be used as the illuminating light source for image reconstruction.
In this thesis, diffraction theory and computer simulation are used to calculate the direction of diffraction beam and to obtain the parameters needed for our experimental setup. The characteristics of the reconstructed 3D images and the methods to improve the quality of images are also discussed.
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| 參考文獻 |
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