同軸全像儲存系統之特性與改良及溫度補償;The Characteristic Study, Improvement and Temperature Compensation of the Collinear Holographic Storage System

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题名:	同軸全像儲存系統之特性與改良及溫度補償;The Characteristic Study, Improvement and Temperature Compensation of the Collinear Holographic Storage System
作者:	余業緯;Yeh-Wei Yu
贡献者:	光電科學研究所
关键词:	相位疊加法;體積全像;相位調製;收縮;膨脹;熱膨脹;溫度補償;同軸;全像;儲存;phase modulation;Volume holographic;VOHIL;shrinkage;expansion;thermal expansion;temperature compensation;storage;coaxial;collinear
日期:	2009-02-25
上传时间:	2009-09-22 10:34:38 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本論文之目的在於研究同軸式體積全像儲存系統之特性，再進一步提出改良，並解決同軸系統由溫度變化所產生的膨脹收縮問題，研究方式採取先推導出各狀況下之近軸近似解，藉由近軸近似解所呈現的各種物理特性提出改良方案，其成果為： 1.我們提出使用透鏡陣列相位調製方式以使繞射訊號達到最佳的SNR。 2.我們提出點位移靈敏度與畫素位移靈敏度之概念，並比較使用此兩種觀點分析位移靈敏度之優劣。 3.以解析解為基礎，並考量材料應變對碟片厚度的影響，我們提出世界第一套同軸系統之溫度補償方案，甚至能夠在不改變讀取光波長的情況下進行溫度補償。The purpose of this dissertation is to study the property of the collinear holographic storage system, and to improve the system. Besides, we propose methods to compensate the problem caused by thermal expansion. In order to study this topic, we derive the paraxial solution of the collinear system, which makes it easy to understand the physical characteristic of the system. Thus, we can improve the system based on the physical concept. The achievements in this dissertation are list below. 1.We propose the lens array phase modulation, which makes the diffracted signal achieve the best signal to noise ratio. 2.We propose the concepts of shift selectivity for point object and shift selectivity for pixel object, and compare the shift selectivity based on these two different concepts. 3.Based on the paraxial solution, and considering the thickness variation of the material caused by strain, we propose the first solution in the world for temperature compensation of the collinear system without changing the wave length of reading beam.
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