多波繞射疊加訊號法之參考光位置誤差分析;The Analysis of Reference-beam Position Error in Multi-page Superposed Signal Method

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题名:	多波繞射疊加訊號法之參考光位置誤差分析;The Analysis of Reference-beam Position Error in Multi-page Superposed Signal Method
作者:	黃崑豪;Huang, Kun-Hao
贡献者:	光電科學與工程學系
关键词:	體積全像;全像;儲存;Volume holographic
日期:	2021-10-14
上传时间:	2021-12-07 12:01:39 (UTC+8)
出版者:	國立中央大學
摘要:	本論文中，我們嘗試提出一個全新全像儲存方法，其稱作多波繞射疊加訊號法。此理論是利用柱狀波參考光在布拉格簡併方向上的發散球面波為參考光進行記錄，並在讀取時透過將簡併方向的發散球面波錯位使得繞射光在簡併方向上產生球面波相位差。此球面波相位差會因為讀取位置而改變，因此我們透過多重曝光及設計各頁相位調製訊號，來控制在不同讀取位置下的多波繞射疊加訊號光的光強度大小。首先我們以全像術理論來介紹此項理論，再藉由相位疊加法與純量繞射理論建立離軸式全像儲存系統的計算模型。最後分析在紀錄時不同軸向的誤差對於系統的訊雜比變化，以作為此系統的容忍度評估標準。 ;In this thesis, we try to promote a holographic data storage method that called Multi-page superposed signal changed with reading position. This theory is use cylindrical wave as reference light for recording. The cylindrical wave is a diverging spherical wave in the direction of Bragg degeneracy direction, and the signal beam is a plane wave. When reading, the divergent spherical wave in the degenerate direction is misaligned so that the diffracted light produces a spherical surface in the degenerate direction. This phase difference will change depending on the reading position. Therefore, by using multiple exposures and designing phase modulation signals for each page, we can control the multi-page superposed signal at different reading position. First, we introduce this theory with the theory of holography, and then establish the calculation model of the off-axis holographic storage system based on Based on the scalar diffraction theory and VOHIL model. At the end, we analyzes the changes in the signal-to-noise ratio of the system from the errors of different axes during recording to serve as the system′s tolerance evaluation standard.
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