光聚合體是感光紀錄材料，擁有高繞射效率、高解析度、高光敏度、光譜響應寬、曝光後處理方便（加熱即可）及圖像存儲穩定等優點。在全像感光底片製作及IC光罩生產中，有很大發展潛力。更將有潛力發展光電材料(如光子晶體)。目前對於光聚合體材料大量配比之實驗，相關文獻甚少。而市場上亦難於購買相關產品。因此本實驗對光聚合體五種不同材料之配比、藥膜厚度及最高繞射效率之曝光時間，量測其零級繞射效率及曝光時間並且建立資料庫，讓我們對光聚合體有更深入的了解。
　　在文獻上繞射效率(diffraction efficiency)很多都是以單一配比之圖形表示，尚未有改變一種化學成分而且把多個配比的數據和表格之發表，並對各種配比到達最大繞射效率所需之曝光時間做研究，使得光電業可以縮短生產全像相關成品所需之曝光時間。
　　感光紀錄材料由溶劑、樹脂、單體、光增感劑和光引發劑等五種化學成分所組成，在暗反應之後，材料形成兩個部分：反應的區域變成聚合體(polymer)和未反應的區域還是單體(monomer) ，由於曝光後由於聚合體和單體成分不一樣而使折射率(refractive index)變化，也因此引起高繞射效率。

　　Photopolymer is one of the holography recording media. It yields high diffraction efficiency、high resolution、high photosensitivity、wide spectrum response、exposure followed by heating and the latent image storage high stability. The potential application of it is in holography photosensitivity film manufacture and production of IC mask and which can develop optoelectronic materials (such as photonic crystal). Up-to-date few the literature on the experiments of various photopolymer ratio is few. Since such recording film is hard to find on the market. Thus the experiment study on the ratio、thickness and maximum diffraction efficiency with measuring the zeroth order diffraction efficiency and exposure time have been expected to build-up a data base and the details of the photopolymer can be found.
　　According to bibliography, the figures or tables of diffraction efficiency with only one kind of recording media can be found, and there are no experiments results on more than one kind of the recording media. This study want to find the required exposure time and layer thickness which can reach maximum diffraction efficiency so that opto-electronic industrial can shorten the time on the manufacture of holography optical elements.
　　The recording medium consists of five components. They are solution、resin、monomer、photo-sensitizer and photo-initiator. After dark reaction，the medium is transform into two portions which are the reacted region of polymer and un-reacted region of monomer. Owing to the composition of polymer and monomer are of different physical properties so that the change of refractive index and the diffraction efficiency between them is high.

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