本篇論文主要針對亂相編碼體積全像儲存中的相位鑰匙（Phase Key）的光學歸位性做進一步的研究及探討。亂相編碼體積全像儲存中的相位鑰匙在光學保密、光學編碼、圖形識別等方面是相當重要之關鍵元件。相位鑰匙也就是毛玻璃，具有唯一性且難以複製，角度/位移靈敏度也是相當好的，當毛玻璃之位置改變時，其亂相編碼資訊之原始狀態也會跟著改變，使得亂相編碼體積全像繞射之狀態亦改變。
針對亂相編碼體積全像儲存中的相位鑰匙的光學歸位性，利用全像關連器（Holographic Correlator）幫助亂相編碼體積全像儲存系統中的相位鑰匙定位，並且利用電腦連結全像關連器和二維移動平移台可視為一個回饋系統，此回饋系統利用移動平移台將相位鑰匙回歸到原始位置上，進而讓亂相編碼體積全像儲存系統的之資訊得以完整重現。
本篇論文探討之問題，主要可分為三個主要的部分：第一部份針對亂相編碼體積全像儲存以及相位鑰匙之重要性，作其發展的簡介。第二部份提出相位鑰匙之光學歸位性的原理，其中包含全像關連器之理論以及建構一個全像關連器的實驗架構。第三部將全像關連器應用在亂相編碼體積全像儲存中相位鑰匙的定位。

Phase key, which uses optical encoding techniques for system security, plays an important role in optical storage, optical communication, and optical display. It employs a random phase generator with a volume hologram for optical encoding. The advantages of using phase keys for optical communication is: (1) it is hard to be duplicated and (2) it requires sensitively alignment to decode the desired signal. Thus, it ensures security of the optical system.
However, the adjunctive challenge of using a phase key is the difficulty of alignment by users. In this paper, we propose a method for optical alignment of the phase key in a random phase encoded volume holographic storage system. In this method, a holographic correlator is applied to help the optical alignment of the phase key. It has been shown that the desired signal from the random phase encoded volume holographic storage system can be retrieved easily with high security.

CHINESE ABSTRACT I
ENGLISH ABSTRACT II
ACKNOWLEDGEMENTS III
TABLES OF CONTENTS IV
LIST OF FIGURES V
CHAPTER 1 INTRODUCTION 01
CHAPTER 2 PRINCIPLE OF ALIGNMENT
2.1 Principles of the Holographic Correlator 04
2.2 Experiments of the Holographic Correlator 07
CHAPTER 3 EXPERIMENT AND RESULTS 13
CHAPTER 4 CONCLUSIONS 19
REFERENCES 27

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