本文關(guān)鍵詞： 全息存儲 體相位柵 衍射效應(yīng) 鉀鈉鈮酸鍶鋇晶體　出處：《西安工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：全息存儲作為一種具有很大潛力的信息存儲技術(shù)一直以來都是人們研究的熱點(diǎn)之一。盡可能的實(shí)現(xiàn)信息的海量存儲以及數(shù)據(jù)的高速尋址也是現(xiàn)今該領(lǐng)域研究的主要關(guān)注點(diǎn),因此,對全息存儲介質(zhì)的研究具有十分重要的意義。理想的全息存儲介質(zhì)不僅要能夠滿足信息的大容量存儲,同時(shí)還要能夠及快速的響應(yīng)數(shù)據(jù)信息以及獲得高保真的再現(xiàn)像。在已有的對全息存儲材料的研究中,能夠同時(shí)滿足存儲容量、存儲性能以及低成本價(jià)格的理想材料仍處于探索階段。對于早日實(shí)現(xiàn)全息存儲的廣泛商業(yè)化應(yīng)用而言,首先需要解決的問題就是發(fā)現(xiàn)理想的全息存儲材料。本文主要針對鉀鈉鈮酸鍶鋇晶體的全息存儲特性進(jìn)行了理論分析與實(shí)驗(yàn)研究。其主要的研究內(nèi)容包括：(1)理論研究了全息存儲技術(shù)、全息存儲機(jī)理、光折變效應(yīng)及耦合波理論等。通過理論研究提出鉀鈉鈮酸鍶鋇晶體可作為全息存儲介質(zhì)的猜想,并進(jìn)一步通過實(shí)驗(yàn)證實(shí)。(2)入射光斑大小對于全息再現(xiàn)像像質(zhì)的影響。通過改變物光與參考光的入射光斑大小,分別對物光光斑大于參考光光斑大小；物光光斑等于參考光光斑大小；物光光斑小于參考光光斑大小三種條件下的全息再現(xiàn)像進(jìn)行像質(zhì)分析,實(shí)驗(yàn)結(jié)果顯示當(dāng)物光光斑大于參考光光斑大小時(shí)全息再現(xiàn)像像質(zhì)最好。(3)鉀鈉鈮酸鍶鋇晶體的全息存儲入射角度范圍(動態(tài)范圍)研究。實(shí)驗(yàn)保證單一變量,通過對實(shí)驗(yàn)光路中參考光入射角度的改變對其對應(yīng)的全息再現(xiàn)像像質(zhì)進(jìn)行分析,研究結(jié)果表明,鉀鈉鈮酸鍶鋇晶體的可存儲入射角度范圍為20°36‘～40007’,該結(jié)構(gòu)間接反映了鉀鈉鈮酸鍶鋇晶體的動態(tài)范圍。(4)鉀鈉鈮酸鍶鋇晶體的衍射效率研究。首先研究了體相位柵在晶體內(nèi)的不同位置下全息再現(xiàn)像的持續(xù)時(shí)間變化,隨后跟進(jìn)研究結(jié)果進(jìn)一步對再現(xiàn)像衍射效率進(jìn)行研究,得出結(jié)論：當(dāng)晶體內(nèi)形成的體相位柵完全在晶體內(nèi)部時(shí),再現(xiàn)像持續(xù)時(shí)間最長為262s,此時(shí)的衍射效率達(dá)到最大值31%。(5)鉀鈉鈮酸鍶鋇晶體的響應(yīng)時(shí)間研究。通過控制晶體的曝光時(shí)間對不同的曝光時(shí)間下得出的全息再現(xiàn)像衍射效率進(jìn)行研究,結(jié)合響應(yīng)時(shí)間定義得出鉀鈉鈮酸鍶鋇晶體的響應(yīng)時(shí)間為3s。(6)鉀鈉鈮酸鍶鋇晶體的存儲持久性研究。在晶體記錄信息后不改變?nèi)魏螌?shí)驗(yàn)條件將其放置于黑暗條件下,分析存儲不同時(shí)間后再現(xiàn)像情況,最終得到鉀鈉鈮酸鍶鋇晶體的存儲持久性為16小時(shí)。
[Abstract]:As a kind of information storage technology with great potential, holographic storage has always been one of the research hotspots. The realization of mass storage of information and the high-speed addressing of data are also the main concerns in this field. Therefore, the study of holographic storage media is of great significance. At the same time, it must be able to respond to the data information and obtain high fidelity images. In the existing research on holographic storage materials, it can satisfy the storage capacity at the same time. Storage performance and low-cost ideal materials are still in the exploration stage. The first problem to be solved is to find the ideal holographic storage material. In this paper, the holographic storage characteristics of potassium sodium strontium barium niobate crystal are studied theoretically and experimentally. The main research contents include: 1) theory. The holographic storage technology is studied. The holographic storage mechanism, photorefractive effect and coupling wave theory are studied. The hypothesis that potassium sodium strontium barium niobate crystal can be used as holographic storage medium is proposed. The effect of incident spot size on the image quality of holographic reconstruction is further verified by experiments. By changing the incident spot size of object light and reference light, the size of object light spot is larger than that of reference light spot. The object light spot is equal to the reference light spot size, the object light spot is smaller than the reference light spot size, and the holographic reconstruction image is analyzed for image quality under three conditions: the object light spot is smaller than the reference light spot size. The experimental results show that the holographic reconstruction image has the best image quality when the object light spot is larger than the reference light spot.) the holographic storage angle range (dynamic range) of the potassium sodium strontium barium niobate crystal is studied. By analyzing the change of the incident angle of the reference light in the experimental light path, the corresponding image quality of holographic reconstruction is analyzed, and the results show that, The storable incidence angle range of strontium barium potassium sodium niobate crystal is 20 擄36 / 40007, which indirectly reflects the dynamic range of potassium sodium strontium barium niobate crystal. (4) diffraction efficiency of strontium barium potassium sodium niobate crystal is studied. First, the diffraction efficiency of bulk phase grating in crystal is studied. The duration of holographic reconstruction at different positions within, The diffraction efficiency of the reconstructed image is further studied by following up the research results. It is concluded that when the bulk phase gate formed in the crystal is completely inside the crystal, The maximum duration of the reconstructed image is 262 s, and the diffraction efficiency reaches the maximum of 31and 5) the response time of strontium barium potassium sodium niobate crystal is studied. By controlling the exposure time of the crystal, the diffraction efficiency of the holographic reconstruction image obtained at different exposure times is studied. Combined with the definition of response time, it is obtained that the response time of strontium barium potassium sodium niobate crystal is 3s. 6) the storage persistence of potassium sodium strontium barium niobate crystal is studied. After recording the information of the crystal, it is placed under dark conditions without changing any experimental conditions. Finally, the storage persistence of potassium sodium strontium barium niobate crystal is 16 hours.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O438.1;TP333

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