可環繞觀賞全像圓盤子片之繞射效率均勻性研究; Study of diffraction efficiency uniformity of 360-degree disk-type transfer hologram

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题名:	可環繞觀賞全像圓盤子片之繞射效率均勻性研究;Study of diffraction efficiency uniformity of 360-degree disk-type transfer hologram
作者:	蔡宗霖;Tzung-Lin Tsai
贡献者:	光電科學研究所
关键词:	圓極化;圓盤型複合全像術;circular polarization;multiple hologram
日期:	2011-08-15
上传时间:	2012-01-05 14:36:32 (UTC+8)
摘要:	全像術的概念首先是D. Gabor在1948年所提出，他證實了「波前重建」的可能性；到了1969年，D. J. DeBitetto提出了複合全像術的製作方法，它是利用人眼的水平視差，分別讓觀賞者左、右眼接收具有不同水平角度的二維影像，而最後經由大腦解讀成三維影像。在過去的全像複製光學系統研究中，其中由於極化(TE和TM重建影響)的影響，使圓盤各區域繞射效率不均的現象，藉此研究可發現，用線極化光入射重建圓盤型複合全像片，會因極化而造成兩正交曝光區域繞射效率不同的現象。為了解決此二區域繞射效率不均的現象，藉由旋轉入射光極化方向的方式進行二次曝光，達到縮小兩區域繞射效率的差異性目的。本篇論文為了實現單步驟單光束複製光學系統實用性，降低極化所造成的問題對繞射效率的影響，同時省去利用二次曝光的方式，我們提出了在複製系統中加入四分之一波板，使線極化光轉換為圓極化光，而由於圓極化光具有對稱性(TE和TM重建情況相同)，因此可解決由極化所造成繞射效率不均的問題，本論文將藉由理論與實驗，提出可有效降低圓盤各區域繞射效率不均的複製技術。 In 1948, the concept of hologram was first proposed by D. Gabor. He demonstrated the probability of the wavefront reconstruction. D. J. DeBitetto proposed the multiplex hologram concept in 1969. It is the use of human eye parallax to receive the different horizontal two-dimensional image in different eyes respectively. Finally, the three dimensional image is interpreted by the brain. In recent year, 360-degree image-plane disk-type multiplex hologram is intensively studied. Linearly polarized light was used to copy the hologram. The diffraction efficiency on the copied hologram for different position is different. To solve the asymmetrical problem, double exposure method using two polarization lights is performed to reduce the differences of diffraction efficiency. In order to achieve one-step single-beam duplication, to reduce the effect of polarization on diffraction efficiency and to eliminate using the double exposure way, we propose to use the circular polarization light as light source to replace the linear polarization light source. Because the circular polarization is symmetrical (TE is equal to TM), the proposed method can solve the diffraction efficiency asymmetry problem. The experimental data demonstrate that the circular polarization can effectively reduce the diffraction efficiency asymmetry phenomenon in the disk-type multiplex hologram.
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