共軛重建產生收斂物波之成像面圓盤型複合全像術

洪偉晧(Wei-hao Hong)

指導教授 ： 鄭益祥

國立中央大學/理學院/照明與顯示科技研究所/碩士(2015年)

摘要

本論文主要的目的是改善發散物光圓盤複合全像所造成的重建影像形變以及影像多波段的問題，並且維持其所帶來的高放大倍率的優點。
本論文的物光系統仍採用發散光架構以保留高放大倍率的優點，將原先的參考光改為收斂參考光，收斂至全像底片後方的圓盤軸心上，如此一來便可用共軛重建的方式產生收斂觀測點。在觀賞時，因為有收斂點的緣故，所以解決了影像多波段的問題。另外，因為所看到的影像由原本多張全像片組成的改為單一全像片來產生，所以影像的形變也較容易修正。過程中利用了母子片翻拍的技術，不僅提高了繞射效率，更使得全像圓盤半徑變大，解決收斂物光系統拍攝出的全像圓盤半徑受到出口透鏡限制的問題。
最後利用手電筒LED的光源重建影像，觀看不同俯角與距離的影像變化，並利用Matlab程式模擬出理論結果，與實驗結果相比較。

關鍵字

全像術 ； 發散物光 ； 複合全像術 ； 圓盤型

並列摘要

We solve the problems that the occur when the diverging object beam is utiligzd in fabrication of disk-type multiplex hologram. With diverged object wave, the reconstructed image is of rainbow color form top to bottom with severe distortion.
　　Keeping the advantage of ligh magnification ratio using diverging object beam,we reform our reference beam form divergent convergent form. The converging reference wave is converged into a point on the symmetry axis of and behind the hologram. In the image reconstruction, a diverging reference wave brings out all the 2D images, each be observed at certain location. Hence, the observed image at the designated location is no longer generated from a large set of individual holograms and the image distortion is greatly reduced. Because there is a viewing point for each 2D image, the observed image is quite single-colored form top to bottom. In the holographic process, we adopt copying technique to not only increase the diffraction efficiency of the hologram but also enlarge the radius of the hologram disk. This solves the problems of low diffraction efficiency and small radius of the hologram disk occured when the converging object beam is utilized to record the hologram.
　　Finally, we use the LCD from the flashlight to reconstructed image and observe its variation when the viewing angle and the observation distance is changed. We also used MATLAB program to theoretically simulate the holographic process and compare the result with that from the experiment.

參考文獻

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