200837518 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種用於從全像儲存媒體存入資料與讀取 資料之設定及方法。 【先前技術】 在全像資料儲存中，將含有數位資訊（，〇,及，Γ)之二維空 間燈光調變器（SLM)圖案投影於全像儲存媒體上。最普通 組態為所謂之4f傅立葉（Fourier)組態，其中SLM與第一透 鏡之間的距離為此透鏡之一焦距fi，自此透鏡至媒體之距 離為自媒體至第二透鏡之距離為此第二透鏡的一焦距 f2 ’且最後自此第二透鏡至偵測器陣列之距離又為込。通 常 fl = f2。 在圖4中給出此設定之說明。由雷射源（未圖示，由參考 數字112指示）發出之光被分成兩個光束。借助於偏光分光 器13 6將弟一光束114導向反射性空間燈光調變器j〗6(例 如’ LCoS設備）。第二光束被用作參考光束122。朝向成像 透鏡118反射回由反射性空間燈光調變器116(R-SLM)產生 之二維資料頁（data page)，成像透鏡118使光聚焦至全像儲 存媒體126中。由透鏡118聚焦至全像儲存媒體126中之光 被已知為信號光束120。全像儲存媒體126為全像儲存裝置 110之部分，全像儲存裝置11〇(在如所說明之簡單狀況下） 包含兩個保護層138、140，其之間夾有全像儲存媒體 126。為了記錄，信號光束120與參考光束122干涉，其在 全像儲存媒體126中導致折射率之調變。此調變表示所儲 125451.doc 200837518 存之資料。在讀取期間，僅由參考光束122照亮媒體，此 借助於在全像儲存媒體126中的散射而導致最初由信號光 束120載運之資料頁波前的重建。由透鏡144將經散射之光 束142成像於偵測器陣列124(例如，CM〇s或CCD陣列） 上。自R-SLM 116至第一透鏡118之距離對應於此透鏡118 之焦距且等於自透鏡118至全像儲存媒體126之距離。另 外，自全像儲存媒體126至第二透鏡144之距離及自第二透 鏡114至偵測器陣列124之距離等於首先提及的距離；因此 名為4f組態。 由於在全像儲存媒體126之兩侧上存在笨重且較大光學 為件，所以展示於圖4中之組態之熟知問題為缺少緊湊 性。先前技術中之已知改良為執行相位共軛讀取（參見（例 如）：Ken Anderson 等人之 High speed holographic data storage at 100 Gbit/in2(Tech· Digest ISOM/ODS 2005))。使 用相位共軛，藉由在記錄期間所使用之參考光束之相位共 軛來完成讀取，亦即，讀取期間之參考光束與資料儲存期 間之參考光束反向傳播。 在圖5中給出此設定之說明。雖然使用參考光束122的記 錄階段與參看圖4所述者類似，但讀取階段為不同的。在 讀取時，藉由反向傳播之參考光束132照射全像媒體。所 得經散射之光束行進至透鏡118且通過透鏡118。偏光分光 器136將經散射之光束投射至偵測器庳列124，與圖4之設 定相比較，該偵測器陣列124定位於與空間燈光調變器 116偏光为光器13 6、聚焦透鏡118及光源112相同之全像 125451.doc 200837518 =衣置11 0之側上。然而，雖然根據圖5之整個系統的確 比根據圖4之系統緊湊，但由於需要自全像儲存裝置之另 一侧^射在讀取時使用之參考光束且（例如，為了平面中 角度多工）加以操縱，所以在全像儲存裝置之"另一側”上仍 需要某些光學器件。 因此，需要提供一種更緊湊之系統。 【發明内容】200837518 IX. Description of the Invention: [Technical Field] The present invention relates to a setting and method for storing data and reading data from a holographic storage medium. [Prior Art] In the holographic data storage, a two-dimensional spatial light modulator (SLM) pattern containing digital information (, 〇, Γ, Γ) is projected onto a holographic storage medium. The most common configuration is the so-called 4f Fourier configuration, where the distance between the SLM and the first lens is the focal length fi of one of the lenses, and the distance from the lens to the medium is the distance from the medium to the second lens. A focal length f2' of the second lens and finally the distance from the second lens to the detector array is again 込. Usually fl = f2. A description of this setting is given in Figure 4. Light emitted by a laser source (not shown, indicated by reference numeral 112) is split into two beams. The dipole beam 114 is directed by means of a polarizing beam splitter 13 6 to a reflective spatial light modulator j<6> (e. g. ' LCoS device). The second beam is used as the reference beam 122. Reflecting toward the imaging lens 118 back to the two-dimensional data page produced by the reflective spatial light modulator 116 (R-SLM), the imaging lens 118 focuses the light into the holographic storage medium 126. Light that is focused by lens 118 into holographic storage medium 126 is known as signal beam 120. The holographic storage medium 126 is part of the holographic storage device 110. The holographic storage device 11 (in the simple case as illustrated) includes two protective layers 138, 140 with a holographic storage medium 126 interposed therebetween. For recording, signal beam 120 interferes with reference beam 122, which causes modulation of the index of refraction in holographic storage medium 126. This modulation represents the information stored in the 125451.doc 200837518. During reading, the medium is illuminated only by the reference beam 122, which results in the reconstruction of the data page front of the data sheet initially carried by the signal beam 120 by means of scattering in the holographic storage medium 126. The scattered light beam 142 is imaged by a lens 144 onto a detector array 124 (e.g., a CM 〇 or CCD array). The distance from the R-SLM 116 to the first lens 118 corresponds to the focal length of the lens 118 and is equal to the distance from the lens 118 to the holographic storage medium 126. In addition, the distance from the hologram storage medium 126 to the second lens 144 and the distance from the second lens 114 to the detector array 124 are equal to the first mentioned distance; hence the name 4f configuration. Because of the cumbersome and large optical components on either side of the holographic storage medium 126, the well-known problem with the configuration shown in Figure 4 is the lack of compactness. A known improvement in the prior art is to perform phase conjugate reading (see, for example, High Speed holographic data storage at 100 Gbit/in 2 (Tech Digest ISOM/ODS 2005) by Ken Anderson et al.). Using phase conjugation, reading is accomplished by phase conjugation of the reference beam used during recording, i.e., the reference beam during reading is back-propagated with the reference beam during data storage. A description of this setting is given in Figure 5. Although the recording phase using the reference beam 122 is similar to that described with reference to Figure 4, the reading phase is different. Upon reading, the holographic media is illuminated by the back-propagating reference beam 132. The resulting scattered beam travels to lens 118 and through lens 118. The polarizing beam splitter 136 projects the scattered beam onto the detector array 124. The detector array 124 is positioned to be polarized with the spatial light modulator 116 as a light detector 13 6 and a focusing lens as compared to the setting of FIG. 118 and the same hologram of the light source 112 125451.doc 200837518 = on the side of the clothing 110. However, although the overall system according to Fig. 5 is indeed more compact than the system according to Fig. 4, it is required to use the reference beam used for reading from the other side of the holographic storage device and (for example, for angled multiplex in plane) It is manipulated, so some optics are still needed on the "other side" of the holographic storage device. Therefore, it is desirable to provide a more compact system.
根據本發明之H ’提供—種用於從全像儲存媒體存 入資料並讀取資料之設定，該設定包含： 一光源’其用於發出具有波長人之光， -調變器’其用於調變由光源發出之光以形成信號光 束， :構件纟用於將4吕號光束聚焦至全像儲存媒體中， 一光源’其用於發出參考光束至全像儲存媒體中，該參 考光束具有波長λ， /、中二疋包3格栅及一 λ/4層，其經配置使得格栅繞 射^射夢考光束’緊接著經繞射之光束再次穿過λ/4層。 藉由使用適當格柵，可能將由格柵繞射之參考光束用於 與信號光束干涉並在全像儲存媒體内產生折射率調變，或 用於歸㈣人射參考光束與信號光束之干涉而讀取先前儲 存之貧料。由於格栅，全部光學器件定位於全像儲存媒體 之同-侧上’其相對於設定之緊湊性為尤其有用的。 根據-實施例’格拇常數為咖_，θ為入射參考光束 之標稱入射角。由於此格栅，在參考光束以角Θ入射之狀 125451.doc 200837518 況下’ 一階繞射光與參考光束反向傳播。 根據另-實施例，參考光束之人射角θ，相對於參考光束 之標稱入射角θ為可變的。在此基礎上，使得角度多工成 為可能，其准許儲存較多資訊至該全像料媒體之相同體 積中。According to the present invention, H' provides a setting for storing data from a holographic storage medium and reading data, the setting comprising: a light source 'which is used to emit light having a wavelength of a person, - a modulator' The light emitted by the light source is modulated to form a signal beam, and the component 纟 is used to focus the 4 Lu beam into a holographic storage medium, and a light source 'is used to emit a reference beam into the holographic storage medium, the reference beam There is a wavelength λ, /, a middle two-pack 3 grid and a λ/4 layer, which are configured such that the grid diffracts the beam, and then the diffracted beam passes through the λ/4 layer again. By using a suitable grid, it is possible to use a reference beam diffracted by the grid for interference with the signal beam and to produce refractive index modulation in the holographic storage medium, or for the interference of the (four) human-beam reference beam with the signal beam. Read the previously stored lean material. Due to the grid, all optics are positioned on the same side of the holographic storage medium' which is particularly useful with respect to set compactness. According to the embodiment, the thumb constant is _, θ is the nominal incident angle of the incident reference beam. Due to this grid, the first-order diffracted light is propagating backwards with the reference beam in the case where the reference beam is incident at a corner angle of 125451.doc 200837518. According to a further embodiment, the angle of incidence θ of the reference beam is variable with respect to the nominal incident angle θ of the reference beam. On this basis, angle multiplexing is made possible, which permits storing more information into the same volume of the holographic media.
實施多工之可能性在於，對於儲存期間之參考光束之不 同入射角…’格栅常數為U2sine，且讀取期間的入射 參考光束與記錄期間之經繞射的參考$束料。因此，即 使在經設計以產生給定參考光束而非在儲存期間使用之所 有參考光束之相位共輛的格栅情況下，仍可藉由對準需要 以本發明意義反向傳播之光束而實現本發明。 根據另-實施例’對於儲存期間之參考光束之不同入射 角『而言’格柵常數為x/2sine’且讀取期間之經繞射的參 考光束與在§己錄期間之入射參考光束對準。 根據又一實施例，格柵經調適以在讀取期間為繞射的且 在記錄期間為基本上透明的。歸因於缺少格柵而在儲存期 間未產生經繞射之參考光束，而在讀取期間，經繞射之參 考光束可用於自全像媒體儲存讀取資料。如【實施方式】 中所解釋，此准許增加全像媒體中的資料密度。 由於此原因，格栅可具有光致變色性質。 另外，可能在投影構件與格柵之間配置一選擇性透明元 件，設定包含用以致使該選擇性透明元件在讀取期間為基 本上透明的且在記錄期間為基本上不透明的構件。 本發明之一態樣進一步係關於一種用於在具有波長九之 125451.doc -10· 200837518 光的基礎上儲存資料之全像儲存裝置，該全像儲存聿置勺 含一全像儲存媒體、一格柵及全像儲存媒體與格柵2問= 一 λ/4層。 、 特定言之，全像儲存震置可形成—包含全像儲存媒體、 格栅及λ/4層之整體裝置。 根據-實施例’全像儲存裝置能夠與由用於從全像健存 裝置存人資料並讀取資料之設定產生之參考光束—起: 用二參考光束具有標稱入射角0’且格柵具有λ/2—之格 拇常數。 本發明之-態樣進-步係關於—種將資料存人於全像儲 存衣置中之方法，該方法包含以下步驟： 發出具有波長λ之光， 對光進行調變以形成信號光束， 提供-全像儲存裝置，其包含—全像儲存媒體、_格柵 及王像儲存媒體與格栅之間的一 λ/4層， 將信號光束聚焦至全像儲存裝置中， I出參考光束至全像儲存裝置中，該參考光束具有 λ， 中入射參考光束在穿過全像儲存媒體並穿過λ/4層之 後被格柵繞射，接著經繞射之光束再次穿過λ/4層並穿過 全像儲存媒體，及 其中藉由經繞射之光束與信號光束之干涉而將資料存入 於全像儲存媒體中。 在此基礎上，可提供自全像儲存裝置讀取資料之方法， 125451.doc 200837518 其中該方法包含以下步驟： 發出參考光束至全像儲存裝置中，該參考光束具有波長 λ， 自全像儲存媒體散射參考光束，及 偵測經散射之參考光束， 其中使在讀取期間使用之參考光束與在儲存期間使用之 經繞射的參考光束對準。 因此，在記錄階段期間使用經繞射光束之反向傳播性 質，而在讀取階段期間僅在入射參考光束基礎上執行習知 讀取。 根據另一實施例，本發明係關於一種將資料存入於全像 儲存衣置中之方法，該方保包含以下步驟： 發出具有波長λ之光， 對光進行調變以形成信號光束， 提供-全像儲存裝置’其包含一全像儲存媒體、—格柵 王像儲存媒體與格柵之間的一 λ/4層， 將信號光束聚焦至全像儲存裝置中， J出’考光束至全像儲存裝置中，該參考光束具有波長 於考光束與信號光束之干涉_料存入 在此背景下，担士盖 種自全像儲存裝置讀取資料之方 法’其中該方法包含以下步驟： 發出參考光束至全像儲存裝置中，該參考光束具有波長 125451.doc 200837518 λ， η :Γ射參考光束在穿過全像儲存媒體並穿過λ/4層之 柵繞射’緊接著經繞射之光束再次 過全像儲存媒體， 曰卫牙 自全像儲存媒體散射經繞射之參考 偵測經散射之參考光束，The possibility of implementing multiplex is that for different incident angles of the reference beam during storage... the grid constant is U2sine, and the incident reference beam during reading and the diffracted reference $beam during recording. Thus, even in the case of a grid designed to produce a given reference beam rather than a phase common vehicle of all reference beams used during storage, it can be achieved by aligning beams that need to be propagated back in the sense of the present invention. this invention. According to another embodiment, the 'grid constant is x/2sine' for the different incident angles of the reference beam during storage and the diffracted reference beam during reading and the incident reference beam pair during the § recording period quasi. According to a further embodiment, the grid is adapted to be diffracted during reading and substantially transparent during recording. The diffracted reference beam is not generated during storage due to the lack of a grid, and the diffracted reference beam can be used to read data from the holographic media during reading. As explained in [Embodiment], this permits an increase in data density in holographic media. For this reason, the grid can have photochromic properties. Additionally, it is possible to configure a selective transparent element between the projection member and the grid, the inclusion of means for causing the selective transparent element to be substantially transparent during reading and substantially opaque during recording. An aspect of the present invention further relates to a holographic storage device for storing data on a basis of light having a wavelength of 125451.doc -10·200837518, the holographic storage spoon containing a holographic storage medium, A grid and holographic storage medium and grid 2 ask = a λ / 4 layer. In particular, holographic storage can be formed—including holographic storage media, grids, and λ/4 layers. According to the embodiment, the holographic storage device can be associated with a reference beam generated by a setting for storing data from a holographic storage device and reading data: using a reference beam having a nominal angle of incidence of 0' and a grid It has a lattice constant of λ/2. The method of the present invention relates to a method for storing data in a holographic storage garment, the method comprising the steps of: emitting light having a wavelength λ, modulating light to form a signal beam, Providing a holographic storage device comprising: a holographic storage medium, a λ grid and a λ/4 layer between the image storage medium and the grid, focusing the signal beam into the holographic storage device, and extracting the reference beam In the holographic storage device, the reference beam has λ, and the incident reference beam is diffracted by the grating after passing through the holographic storage medium and passing through the λ/4 layer, and then the diffracted beam passes through λ/4 again. The layer passes through the holographic storage medium, and the data is stored in the holographic storage medium by interference of the diffracted beam with the signal beam. On the basis of this, a method of reading data from a holographic storage device can be provided, 125451.doc 200837518 wherein the method comprises the steps of: emitting a reference beam into a holographic storage device having a wavelength λ, self-image storage The medium scatters the reference beam and detects the scattered reference beam, wherein the reference beam used during reading is aligned with the diffracted reference beam used during storage. Therefore, the backpropagation properties of the diffracted beam are used during the recording phase, while the conventional reading is performed only on the incident reference beam during the reading phase. According to another embodiment, the present invention is directed to a method of depositing data in a holographic storage garment, the method comprising the steps of: emitting light having a wavelength λ, modulating light to form a signal beam, providing a holographic storage device comprising a holographic storage medium, a λ/4 layer between the grid image storage medium and the grid, focusing the signal beam into the holographic storage device, In the holographic storage device, the reference beam has a wavelength in which the interference between the light beam and the signal beam is stored in the background, and the method covers the reading of the data from the holographic storage device. The method comprises the following steps: A reference beam is emitted into the holographic storage device, the reference beam having a wavelength of 125451.doc 200837518 λ, η: the fluoroscopy reference beam is circulated through the holographic storage medium and through the gate of the λ/4 layer. The beam of light passes through the holographic storage medium again, defending the tooth from the holographic storage medium to scatter the diffracted reference to detect the scattered reference beam,
其中使在讀取期間使用之經繞射 間使用之人射參考光束料。 考先束與在記錄期 :此，雖然藉由入射參考光束與信號光束之干涉在習知 :上執们己錄，但讀取係基於與在記錄期間使用之入射 I考光束對準的經繞射之參考光束。 結合最近提及之實施例，格栅在讀取期間可為繞射的且 在S己錄期間為基本上透明的。 另外’可能在全像記錄媒體與格栅之間配置一㈣性透 明元件’該選擇性透明元件在讀取期間為基本上透明的且 在記錄期間為基本上不透明的。 本發明之此等及其他態樣將自以下所述實施例為顯而易 見且將參看以下所述實施例而加以闡明。 【實施方式】 圖1展示根據本發明之用於從全像儲存媒體存人資料並 讀取資料的設^。記錄情形說明於圖i之部分⑷中。將來 自光源（未圖示但由參考數字12來指示）之經偏振之光咐 射於偏光分光器36中。所涉及之光的偏振方向被展示為固 定在指示光之方向之較大箭頭的原點處的小箭頭或圓。偏 125451.doc -13- 200837518 光分光Is 36將光反射至空間燈光調變器16。空間燈光調變 16將光反射至相反方向。此光可含有表示"〇"及，，〗"（亦 即，待傳运至全像儲存媒體26之資料）之兩種不同偏振。 光傳播通過λ/2層48及透鏡丨8以在偏振方向上旋轉且以信 號光束20之形式投射至全像儲存裝置1〇中。除空間燈光調 變器16外，垂直於空間燈光調變器16而配置一偵測器陣列 24 ’在讀取期間將使用偵測器陣列％。 在圖1之實施例中，全像儲存裝置1〇包含全像儲存媒體 26、一格柵28及夾於全像儲存媒體％與袼柵“之間的一 λ/4層30。保護層50覆蓋全像儲存媒體％。請注意，可自 格栅28及λ/4層30分離全像儲存媒體26。換言之，使用者 可將全像媒體26插入至包含格柵28及人/4層3〇之設定中。 為此，該没定將進一步包含用於收納該全像媒體％之構 件。此收納構件可具有適用於在透鏡“與人“層刈之間配 置全像媒體之任何形式，諸如，纟習知光學儲存裝置（諸 如’在CD播放器中）中使用之托盤。 除信號光束20外，參考光束22被投影至全像儲存裝置⑺ 中此參考光束22具有波長λ，且可由與信號光束2〇之光 源相同的光源12或由不同光源來產生。因此，用於產生信 號光束20之光源與用於產生參考光束22之光源可為同一光 源。歸因於格柵常數之適當選擇，在圖！中所示之實施例 中，參考光束22被繞射至一角度中，使得經繞射之參考光 束34與入射參考光束22反向傳播。藉由入射信號光束2〇與 經繞射之參考光束34之干涉，全像圖案（例如，空間折射 125451.doc 14 200837518 率調變）形成於全像儲存媒體26中。實際上，經繞射之來 考光束34由於λ/4層30而具有與信號光束2〇相同的偏振: 且可因此與信號光束2〇干涉。 讀取情形說明於圖1之部分沙）中。在讀取期間，僅參考 光束32被投射於全像儲存裝置1〇中。在此實施例中，參考 光束32為在記錄期間使用之經繞射之參考光束“的相位共 軛。因此參考光束32自全像散射，穿過透鏡18、人/2層 48、光束分光器36且至偵測器陣列24。Wherein the person used in the diffraction used during reading is directed to the reference beam. The first beam and the recording period: although the interference between the incident reference beam and the signal beam is known in the prior art, the reading is based on the alignment with the incident I-beam used during recording. A reference beam that is diffracted. In connection with the recently mentioned embodiment, the grid may be diffracted during reading and substantially transparent during the recording. Further, it is possible to arrange a (four) transparent element between the hologram recording medium and the grid. The selective transparent element is substantially transparent during reading and substantially opaque during recording. These and other aspects of the invention will be apparent from the description of the embodiments described herein. [Embodiment] FIG. 1 shows an arrangement for storing data from a holographic storage medium and reading data according to the present invention. The recording situation is illustrated in part (4) of Figure i. In the future, the polarized light from the light source (not shown but indicated by reference numeral 12) is incident on the polarizing beam splitter 36. The direction of polarization of the light involved is shown as a small arrow or circle fixed at the origin of the larger arrow indicating the direction of the light. Part 125451.doc -13- 200837518 Light splitting Is 36 reflects light to the spatial light modulator 16. Space Light Modulation 16 Reflects light in the opposite direction. This light may contain two different polarizations representing "" and, "" (i.e., the material to be transported to the holographic storage medium 26). Light propagates through the λ/2 layer 48 and the lens 丨 8 to rotate in the polarization direction and is projected into the holographic storage device 1 in the form of a signal beam 20. In addition to the spatial light modulator 16, a detector array 24' is disposed perpendicular to the spatial light modulator 16 and will use the detector array % during reading. In the embodiment of FIG. 1, the holographic storage device 1 includes a holographic storage medium 26, a grid 28, and a λ/4 layer 30 sandwiched between the holographic storage medium % and the grid. The protective layer 50 Covering the holographic storage medium %. Note that the holographic storage medium 26 can be separated from the grid 28 and the λ/4 layer 30. In other words, the user can insert the hologram medium 26 into the inclusion grid 28 and the person/4 layer 3 In this case, the determination may further comprise means for accommodating the holographic medium %. The storage member may have any form suitable for arranging holographic media between the lens "and the person" layer. For example, a tray used in conventional optical storage devices such as 'in a CD player. In addition to the signal beam 20, the reference beam 22 is projected into the holographic storage device (7). This reference beam 22 has a wavelength λ and can be The light source 12, which is the same as the light source of the signal beam 2, is generated by a different light source. Therefore, the light source for generating the signal beam 20 and the light source for generating the reference beam 22 can be the same light source. Select, the embodiment shown in Figure! The reference beam 22 is diffracted into an angle such that the diffracted reference beam 34 propagates back into the incident reference beam 22. By the interference of the incident signal beam 2〇 with the diffracted reference beam 34, the hologram A pattern (eg, spatial refraction 125451.doc 14 200837518 rate modulation) is formed in the holographic storage medium 26. In practice, the diffracted light beam 34 has the same color as the signal beam 2 由于 due to the λ/4 layer 30. Polarization: and thus can interfere with the signal beam 2〇. The reading situation is illustrated in part of the sand of Figure 1. During reading, only the reference beam 32 is projected into the holographic storage device 1〇. In this embodiment The reference beam 32 is the phase conjugation of the diffracted reference beam used during recording. Thus reference beam 32 is scattered from the full image, through lens 18, human/2 layer 48, beam splitter 36 and to detector array 24.
圖2展示根據本發明之一實施例之全像儲存裝置。此 處’詳述人射參考光束22與經繞射之參考光束34之反向傳 播田Θ為參考光束22在全像媒體内之標稱入射角時，可 藉由選定格柵常數為λ/2“ηθ而達成此反向傳播情形。接 著 & %射之光束34與入射參考光束22反向傳播。 圖3展示用於說明平面中角度多工之全像储存裝置。在 全像貧料儲存中，執行多I以在相同體積中存入更多資 訊。此：：般地藉由變化參考光束之入射角而連續寫入多 個頁來π成。使入射角以(例如)〇1度之步長遞增以記錄不 ^資料H如’可在為可能人射角之平均值之標稱入射 角周圍改變人矣+ . ^ r4 、角。作為一貝例，可在40度與60度之間改 角，標稱人射角在彼狀況下為5()度。然❿，若格栅 禮:而具有λ/28ΐηθ之格柵常數且Θ為標稱入射角，則 人射角％ ’格栅才將精確地在反向傳播方向上繞 蔣、、> 對於其他角度而言，如圖3中所說明，經繞射之光 :δ角度傳出。圖3之部分⑷展示入射角小於標稱入 125451.doc -15- 200837518 射角Θ之情形’而圖3之部分（b)展示大於標稱入射角β之入 射角然而’根據本發明之實施例，正確記錄及讀取仍為 可能的。此可藉由以不同角度之參考光束記錄及讀取而達 成。在如圖1中所說明之記錄及讀取情形中，在讀取階段 中之參考光束的入射方向與特定頁之記錄階段中之經繞射 的光之方向匹酉己。對於不同於格柵已經設計以獲得經繞射 光束之準確反向傳播之角度的在記錄期間所使用之參考光 束之入射角而言，讀取階段中的參考光束之入射方向不同 於記錄階段中之人射參考光束的方向。以此方式，可讀取 所有頁而無保真度之損失。通常，格柵將經設計而具有與 標稱角度Θ(亦即，由參考光束經由之角度範圍之中間的角 度）匹配之間距。 在上述情形中，在記錄及讀取期間皆存在袼柵。此可具 有以下缺點，即在記錄期間，入射參考光束及經繞射之參 考光束兩者都傳播通過光敏全像媒體，而僅兩個光束中之 一者用於儲存資料並隨後讀取資料。在圖丨中所說明之狀 況下，在讀取期間僅由入射參考光束32讀取由經繞射之入 射光束34寫入之資訊。因此，光聚合全像材料之動態範圍 可被兩個光束之存在所消耗，從而導致較低儲存容量。為 解決此問題，考慮另一實施例。根據此另一實施例，不是 經繞射之參考光束用於資料記錄，而是入射參考光束與信 號光束干涉以將資料寫入至全像儲存媒體中。接著藉由經 繞射之參考光束與用於記錄之入射參考光束反向傳播而達 成資料瀆取。在此另一實施例之基礎上，可避免在記錄期 125451.doc -16- 200837518 間歸因於在全像媒體26中兩個束 _Λ, ^ /考光束之存在之儲存容量 中::且：栅為可切換的，亦即，僅在讀取階段 入錄階段中不存在。僅在讀取時打開格柵，且 從束首先自格柵自繞射，隨後自體積全像片散射 -…:建構信號。此可(例如)由具有光致變色性 二=達成。在一波長下’可由以另-波長照射於光 =層上之光的量來控制光致變色層之光學反射及吸 收。亦可使用具有電致變色性質之格柵。 :::實施例中：在··關閉"狀態中，袼柵為基本上透明 料並％射發生。藉由將具有不同於用於在全像上讀取資 尸啟動Γ料之波長的波長之光源麵合至格拇而在讀取階 :啟動格拇(，，打開，，狀態)。此為用於在"寫…^ 狀恶之間切換全像之非接觸方法。 在第二實施例中’在可切換鏡子或吸收器之後隱 1換之格柵。例如’此可為光致變色或電致變色鏡 率。在此實施例中’可獨立於切換特徵而最佳化格柵之效 學對2允許實現”打開"狀態與"關閉，，狀態之間的較大光 二可使用以上並未描述之等效物及修改而不背離在隨附 由月專利祀圍中定義之本發明之範嘴。以下申請專利範圍 β任何參考付就不應理解為限制申請專利範圍。顯然的 =動碉包含"及其動詞變化之使用並不排除除在任何申 咕利^圍中界定之彼等元件外的任何其他元件之存在。 一牛之刖的凋浯’ 一"並不排除複數個此等元件之存在。 125451.doc -17- 200837518 【圖式簡單說明】 圖！（包含圖13及圖lb)展示根據本發明之—實施例之用於 從全像儲存媒體存入資料並讀取資料的設定。 圖2展示根據本發明之一實施例之全像儲存裝置。 圖3(包含圖3a及圖3b)展示用於說明平面中角度多工的全 像儲存裝置。 圖4展示根據先前技術之用於從全像儲存裝置存入資料 並讀取資料的設定。 圖5展示根據先前技術之用於從全像儲存裝置存入資料 並讀取資料的另一設定。 【主要元件符號說明】 10 全像儲存裝置 12 光源 14 光 16 空間燈光調變器/調 18 投影構件/透鏡 20 信號光束 22 參考光束 24 偵測器陣列 26 全像儲存媒體/全像 28 格柵 30 λ/4層 32 參考光束 34 經繞射之光束 125451.doc -18- 200837518 3 6 光束分光器 48 λ/2 層 50 保護層 110 全像儲存裝置 112 光源 114 116 118 120 122 124 126 132 136 13 8 140 142 1442 shows a holographic storage device in accordance with an embodiment of the present invention. Here, the detailed propagation angle of the reference beam 22 and the diffracted reference beam 34 is the nominal incident angle of the reference beam 22 in the holographic medium, and the grid constant can be selected as λ/. 2 "ηθ to achieve this backpropagation situation. Then & % shot beam 34 is back-propagating with the incident reference beam 22. Figure 3 shows a holographic storage device for illustrating angular multiplex in plane. During storage, multiple I is executed to store more information in the same volume. This: Continually write multiple pages by changing the incident angle of the reference beam to make the incident angle (for example) 〇1 The step size is incremented to record no data H such as 'can change human 矣+ . ^ r4 , angle around the nominal incident angle of the average of the possible human angles. As a case, it can be 40 degrees and 60 degrees. The angle between the degrees, the nominal angle of the person is 5 () degrees in the case of the situation. Then, if the grid has: the grid constant of λ / 28 ΐ η θ and Θ is the nominal angle of incidence, then the angle of incidence % 'grid will accurately circumnavigate in the direction of back propagation, &>; for other angles, as illustrated in Figure 3, Diffracted light: δ angle is transmitted. Part (4) of Figure 3 shows that the incident angle is smaller than the nominal 125451.doc -15-200837518 angle Θ ' and the part (b) of Figure 3 shows greater than the nominal angle of incidence β Angle of incidence However, according to embodiments of the present invention, proper recording and reading is still possible. This can be achieved by recording and reading at different angles of the reference beam. Recording and reading as illustrated in FIG. In the case where the direction of incidence of the reference beam in the reading phase is comparable to the direction of the diffracted light in the recording phase of a particular page. For a different inverse from the grid that has been designed to obtain a diffracted beam The angle of incidence of the reference beam in the reading phase is different from the direction of the beaming reference beam in the recording phase in terms of the angle of incidence of the reference beam used during recording from the angle of propagation. In this way, all can be read Page without loss of fidelity. Typically, the grid will be designed to match the nominal angle Θ (ie, the angle between the angular extents of the reference beam). In the above case, in the record And reading There is a grid during the extraction. This may have the disadvantage that both the incident reference beam and the diffracted reference beam propagate through the photosensitive holographic medium during recording, and only one of the two beams is used for storage. The data is then read. In the situation illustrated in the figure, the information written by the diffracted incident beam 34 is only read by the incident reference beam 32 during reading. Thus, the photopolymerized holographic material is The dynamic range can be consumed by the presence of two beams, resulting in a lower storage capacity. To solve this problem, consider another embodiment. According to this alternative embodiment, instead of a diffracted reference beam for data recording, The incident reference beam interferes with the signal beam to write the data into the holographic storage medium, and then the data is captured by the diffracted reference beam propagating backwards with the incident reference beam for recording. On the basis of this further embodiment, it is avoided that during the recording period 125451.doc -16 - 200837518 due to the storage capacity of the presence of two bundles _Λ, ^ / test beam in the holographic medium 26: And: the grid is switchable, that is, it does not exist only during the recording phase of the reading phase. The grid is only opened when reading, and the beam is first self-diffracted from the grid, and then scattered from the full volume of the volume -...: constructs the signal. This can be achieved, for example, by having photochromic properties. The optical reflection and absorption of the photochromic layer can be controlled by the amount of light that is incident on the light layer at another wavelength at a wavelength. A grid having electrochromic properties can also be used. ::: In the embodiment: in the "closed" state, the grid is substantially transparent and % shot occurs. The reading step is initiated by combining a light source having a wavelength different from that used to read the wavelength of the corpse-initiating material on the hologram: the opening (open, state). This is a non-contact method for switching the full image between "write...^. In the second embodiment, the grid is changed after the switchable mirror or absorber. For example, 'this can be a photochromic or electrochromic mirror ratio. In this embodiment, the efficacies of the grid can be optimized independently of the switching characteristics to allow the "open" state and "close, the larger light between the states can be used, etc., which are not described above, etc. INFLUENCE AND MODIFICATION without departing from the scope of the invention as defined by the monthly patent. The following patent application scope β is not to be construed as limiting the scope of the patent application. Apparently = 碉 碉 Include " The use of its verb changes does not exclude the existence of any other element other than those defined in any application. A sloppy 'one' does not exclude a plurality of such elements. 125451.doc -17- 200837518 [Simplified Schematic] FIG. (comprising FIG. 13 and FIG. 1b) shows a method for depositing data from a holographic storage medium and reading data according to an embodiment of the present invention. Figure 2 shows a holographic storage device in accordance with an embodiment of the present invention. Figure 3 (comprising Figures 3a and 3b) shows a holographic storage device for illustrating angular multiplex in plane. Figure 4 shows a prior art according to the prior art. For storage from hologram The data is stored and the settings of the data are read. Figure 5 shows another setting for storing data and reading data from the holographic storage device according to the prior art. [Main component symbol description] 10 holographic storage device 12 light source 14 Light 16 Space Light Modulator / Tuning 18 Projection Member / Lens 20 Signal Beam 22 Reference Beam 24 Detector Array 26 Full Image Storage Media / Full Image 28 Grille 30 λ/4 Layer 32 Reference Beam 34 Diffracted Beam 125451.doc -18- 200837518 3 6 Beam splitter 48 λ/2 Layer 50 Protective layer 110 Full image storage device 112 Light source 114 116 118 120 122 124 126 132 136 13 8 140 142 144
第一光束 反射性空間燈光調變器 成像透鏡/透鏡/聚焦透鏡 信號光束 參考光束 偵測器陣列 全像儲存媒體 參考光束 偏光分光器 保護層 保護層 光束 透鏡 125451.doc -19-First beam Reflective spatial light modulator Imaging lens / lens / focusing lens Signal beam Reference beam Detector array Full image storage medium Reference beam Polarizing beam splitter Protective layer Protective layer Beam lens 125451.doc -19-