| 摘要: | 複合全像術是結合一般攝影術與彩虹全像術之立體影像展示法，其所能拍攝之物體不在侷限於光學桌上之靜止物體，不僅戶外風景人物，甚至連科學、工程、醫學與藝術資料（例如:電腦輔助設計、X 光斷層掃瞄）都可拿來拍攝。因此在三維影像展示方面，複合全像術是極具潛力的。我們過去幾年的研究計畫發展出可以同時提供給環繞四周觀賞者觀賞之『成像面圓盤型複合全像術』[1,2]。 在往實際製作出CD 片全像片的研究當中，我們發現由於雷射光通常是線偏振的（Linearly Polarized），使得圓盤全像片上各個象限對它有所謂的TE 和TM 之分，進而使得製作出的『表面凹凸圓盤型全像片』各區域繞射效率不均勻。本計畫改採完全對稱之『圓偏振』光來拍攝光阻劑全像片，並配合曝光參數來使此全像片具有高繞射效率，亦即具有好的表面凹凸起伏，以利未來之母模研製。 過去在展示全彩影像方面，我們採取三原色圓錐型複合全像片為母片，再將資訊拷貝成圓盤全像片。在各次拷貝之間，將全像底片浸泡回漲液以改變全像光柵之週期與方向，所製作出來的全像片繞射效率極低且影像會發生相互抖動。本計畫改採新設計之光學系統來製作全彩全像片，由於第一步驟的全像片是平面型底片，不必經過彎折成圓錐給第二步驟使用，預期影像展示能力應會比從前製作的好。 我們也將理論分析並實際製作單一步驟之『可環繞觀賞之反射式成像面圓盤型複合全像片』以及製作可展示立體虛像之『可環繞觀賞圓盤型複合全像片』，並詳細分析觀賞狀況，包含各波長之視窗、不同觀賞位置之影像變形與各影像點頻帶等。 Multiplex holography is a type of 3D display which combines the usual photography and rainbow holography. The subject is no longer limited to the stationary object on optical table. Not only the outdoor scene and human beings but also the scientific, engineering, medical as well as art data (such as CAD, X-ray tomography) can serve as the object. Hence, it is very suitable for 3D display. In the previous investigation, we have invented the 360-degree viewable image-plane disk-type multiplex hologram [1,2]. In developing toward making real CD hologram, we found that owing to the linear polarization state of the usual laser, the disk-type hologram can distinguish between the TE and TM states in different quadrants. Hence, the diffraction efficiencies in different regions of the surface-relief hologram are not the same. Here, we adopt light of circular-polarization state to avoid this problem and choose proper exposure level for the photoresist film in order to make surface-relief hologram of not only uniform but also high diffraction efficiency, which would facilitates the making of the nickel master hologram for injection moding. In the previous investigation on full-color image display, we first produced three conical holograms of three primary colors. Then we retrieved the information from them successively onto a flat recording plate. Between exposures, the holographic film was swelled in triethanolamine solution of various concentrations to control the spatial period and the orientation of the holographic gratings. However, the experimental result showed that the reconstructed images belonging to three primary colors wobbled back and forth. Here, we redesign the holographic optical system so that only flat holographic plates are needed for both steps of holographic recording, which may yield better observable images finally. We would also investigate and fabricate both the single-step 360-degree viewable reflection image-plane disk-type multiplex hologram and the transmission-type hologram which can reconstruct virtual 3D images for the surrounding observers simultaneously. The viewing condition, including the viewing ring belonging to various wavelengths, the distortion of image and the observed wavelength bandwidth for viewing at locations off the designated viewing ring, will be investigated. 研究期間：10008 ~ 10107 |
