CN101635150A - Small spherical wave body hologram memory system - Google Patents
Small spherical wave body hologram memory system Download PDFInfo
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- CN101635150A CN101635150A CN200910072737A CN200910072737A CN101635150A CN 101635150 A CN101635150 A CN 101635150A CN 200910072737 A CN200910072737 A CN 200910072737A CN 200910072737 A CN200910072737 A CN 200910072737A CN 101635150 A CN101635150 A CN 101635150A
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Abstract
The invention provides a small spherical wave body hologram memory system. The system consists of a light beam filtering module and a coherent recording module, wherein the light beam filtering module is optically connected with the coherent recording module. The light beam filtering module comprises a laser, a space filter and a collimating lens. Light beams emitted by the laser are changed into divergent light after passing through the space filter, and the divergent light is changed into parallel light beams after passing through the collimating lens. The coherent recording module comprises a polarized beam splitter cube, an object beam prism, a spatial light modulator, a reference light gathering lens, a storage material, a translation platform and a rotating platform. The parallel light passes through a half wave plate used for splitting ratio and is then split by the polarized beam splitter cube into two beams. One beam is cast into the object beam prism and loaded with an image at the spatial light modulator. The other beam passes through the reference light gathering lens and is changed into a gathered beam. The two beams are interfered in the storage material. In the system, no special device is used for realizing same-volume complexing, and the complexing technology can be realized only by the use of the translation platform and the rotating platform. The system has a simple structure and low cost.
Description
(1) technical field
The present invention relates to holographic technique, is exactly a kind of small spherical wave body hologram memory system specifically.
(2) background technology
Holographic technique is the technology of utilizing interference and diffraction principle record and reproducing object intensity and phase information.Its first step is to utilize principle of interference record object light-wave information, and this is a storing process: beam of laser forms object beam through object or information page modulation back; Another Shu Jiguang incides on the storage medium as the reference light beam and the object beam stack produces interference, amplitude on the object beam and phase information are converted to the intensity of modulation spatially, thereby utilize the form of interference fringe that the full detail of object beam is noted.The interference fringe of record just becomes a hologram; Its second step is to utilize diffraction principle to reproduce the information of object beam, and this is an imaging process: hologram is just as the grating of a complexity, and under former reference light irradiation, original light direction can reproduce the amplitude and the phase information of object beam.Each part of hologram has all write down the optical information of each point on the object, so its each part can both be reproduced the entire image of the original in principle, can also on same egative film, write down a plurality of different images by multiexposure, multiple exposure, and can show respectively without interfering with each other.
In body hologram memory system practicability process, how to reduce the volume of whole hologram memory system, make system integration, and have higher memory capacity, be one of key issue of body holophotal system practicability.
People such as the Drolet of California Inst Tech USA have designed a kind of miniaturization phase conjugation holographic memory, utilize the phase-conjugation light reconstructing hologram of reference light.This system makes system very compact because needing image device seldom.Yet because phase conjugator needed the long relatively response time before reaching suitable reflectivity, this just greatly reduces the access data rate, and it is lower to respond the reflectivity of fast phase conjugator.Therefore, this system needs the phase conjugator that response speed is fast and reflectivity is higher, accomplish relatively difficulty of this point, is difficult for realizing practicability.In addition, this system also has the defective of read-write conversion and multiplexing difficult realization, and also compares strict to the requirement that detection array is aimed at SLM.
A kind of miniaturization volume hologram memory has been designed in the jet propulsion laboratory in California (JPL), the volume of this system is 241mm * 165mm * 63mm, the used optical beam scanner of system is to be improved by liquid crystal light valve, thereby cost is higher, and the technology of present this optical beam scanner prematurity still, the purpose that makes this system reach practicability also needs this liquid crystal light valve that utilizes is realized the multiplexing more deep research of scanner do, and reduces cost on the basis of practicability.
(3) summary of the invention
The object of the present invention is to provide a kind of multiplexing storage, compact conformation, small practical spherical wave body hologram memory system of carrying out.
The object of the present invention is achieved like this: it is made up of light beam filtration module and relevant logging modle, and light beam filtration module optics connects relevant logging modle.
The present invention also has following technical characterictic:
(1) described light beam filtration module comprises laser instrument, spatial filter and collimation lens, the light beam that laser instrument sends becomes diverging light through behind the spatial filter, become parallel beam by collimation lens, the distance between spatial filter and the collimation lens equals the focal length of collimation lens.
(2) described relevant logging modle comprises splitting ratio half-wave plate, polarization splitting prism, object beam prism, spatial light modulator, half-wave plate, thing light plus lens, reference light plus lens, reference beam prism, catoptron, storage medium and translation stage and turntable, directional light is polarized Amici prism through splitting ratio after with half-wave plate and is divided into two bundles, a branch of light incides the object beam prism, in spatial light modulator place load image, then become the spherical wave converging beam through half-wave plate and thing light plus lens; Become converging beam behind another Shu Guang process reference light plus lens, change direction behind reference beam prism and catoptron, two-beam is at the storage medium internal interference, and storage medium is placed on translation stage and the turntable, can change the position and the angle of measuring point.
The present invention is a kind of small spherical wave body hologram memory system, and described lens comprise ordinary lens and fourier lense, is good with fourier lense wherein.Owing to reflective spatial light modulator produces 90 degree bit phase delays, identical for making the polarization of reflected light attitude with incident light, then also comprise half-wave plate in the system, in order to change the position phase and to regulate splitting ratio.In addition, the recording mode of hologram can adopt transmission-type, proximal surface incident-type or reflective.This system compares with the body hologram memory system of the JPL laboratory study that the front is introduced, and of no usely realizes with volume multiplexingly to any special device, only needs translation stage and turntable can realize multiplex technique, and system architecture is simple, and cost is low.Compare with the single beam hologram memory system, this system has made full use of the volume of storage medium, can realize the multiple storage of high density.In theory, according to the minimum dimension of Amici prism, guarantee that the ratio of fourier lense diameter and focal length is enough big, the volume of the miniaturization body hologram memory system of the volume ratio JPL research of this system is much smaller.
(4) description of drawings
Fig. 1 is a light beam filtration module structural representation of the present invention;
Fig. 2 is a relevant logging modle structural representation of the present invention;
Fig. 3 is a double-deck hologram memory system structural representation of the present invention;
Fig. 4 is the system's reproduced image design sketch under the different angular spacing of the present invention;
Part reproduced image design sketch when Fig. 5 stores 100 width of cloth images for single-point of the present invention.
(5) embodiment
The invention will be further described for example below in conjunction with accompanying drawing.
Embodiment 1: in conjunction with Fig. 1, Fig. 2, the present invention is a kind of small spherical wave body hologram memory system, and it is made up of light beam filtration module (1) and relevant logging modle (2), and light beam filtration module (1) optics connects relevant logging modle (2).
The present invention also has following technical characterictic:
Described light beam filtration module (1) comprises laser instrument (3), spatial filter (4) and collimation lens (5), become diverging light behind the light beam process spatial filter (4) that laser instrument (3) sends, become parallel beam by collimation lens (5), the distance between spatial filter (4) and the collimation lens (5) equals the focal length of collimation lens (5).
Described relevant logging modle (2) comprises splitting ratio half-wave plate (6), polarization splitting prism (7), object beam prism (8), spatial light modulator (9), half-wave plate (10), thing light plus lens (11), reference light plus lens (12), reference beam prism (13), catoptron (14), storage medium (15) and translation stage and turntable (16), directional light is polarized Amici prism (7) through splitting ratio after with half-wave plate (6) and is divided into two bundles, a branch of light incides object beam prism (8), locate load image in spatial light modulator (9), then pass through half-wave plate (10) and thing light plus lens (11) becomes the spherical wave converging beam; Become converging beam behind another Shu Guang process reference light plus lens (12), behind reference beam prism (13) and catoptron (14), change direction, two-beam is at storage medium (15) internal interference, storage medium (15) is placed on translation stage and the turntable (16), can change the position and the angle of measuring point.
Embodiment 2: in conjunction with Fig. 1, Fig. 2, Fig. 3, the present invention is a kind of small spherical wave body hologram memory system, described laser becomes directional light behind collimation, utilize prism, lens and arrangement of mirrors are realized the two interference of spherical wave in storage medium, polarization splitting prism (7) makes incident beam be divided into thing light and reference light, the end face placement space photomodulator (9) of object beam prism (8), this light beam is focused in the body block of material through thing light plus lens (11), and reference beam prism (13) cooperates with the catoptron (14) of reference light plus lens (12) and upper end provides reference light.Storage medium (15) is realized the multiplexing storage of image by rotation and translation.This system architecture compactness, and be easy to realize system stability.In order to make full use of energy of light source, the unpolarized Amici prism of specific splitting ratio is adopted in this optical design, has had to experimental studies have found that when splitting ratio is about 3: 1 (ratio of transmitted light intensity and reflective light intensity), and holographic memory is fastest.The volume of hologram memory system of the present invention is L
1* L
2* L
3L wherein
1Be slightly larger than the twice of the prism length of side, and the length of side of prism must be less than or equal to lens 2 focal lengths; L
2It is the twice of non-polarization splitting prism; L
3Be the height of system, when not considering the height of spatial light modulator and universal stage, L
3Equal the length of side of Amici prism.For this system bulk is minimized, the size of Amici prism should with the size match of spatial light modulator, when the focal length of lens equals the length of side (also equaling the diameter of lens) of Amici prism, spatial light modulator and lens just can be closely near Amici prism, thereby make system compact more.Adopt commercial devices at present, can realize that volume is the memory module of 38mm * 25.4mm * 12.7mm.
Consider the size of laser instrument, collimating element and turntable, translation stage, storage system in the practical application can adopt double-decker, laser instrument and spatial filter can be placed by lower floor, by collimated, the control assembly of while turntable and translation stage is placed on lower floor and also has enough spaces after reflexing to the upper strata.The overall dimensions of system can be formed size of devices and determine according to each.
Lens among the present invention comprise ordinary lens and fourier lense, are good with fourier lense wherein.Owing to reflective spatial light modulator produces 90 degree bit phase delays, identical for making the polarization of reflected light attitude with incident light, then also comprise half-wave plate in the system, in order to change the position phase and to regulate splitting ratio.In addition, the recording mode of hologram can adopt transmission-type, proximal surface incident-type or reflective.This system compares with the body hologram memory system of the JPL laboratory study that the front is introduced, and of no usely realizes with volume multiplexingly to any special device, only needs a motorized precision translation stage can realize multiplex technique, and system architecture is simple, and cost is low.Compare with the single beam hologram memory system, this system has made full use of the volume of storage medium, can realize the multiple storage of high density.In theory, according to the minimum dimension of Amici prism, guarantee that the ratio of fourier lense diameter and focal length is enough big, the volume of the miniaturization body hologram memory system of the volume ratio JPL research of this system is much smaller.
Embodiment 3: in conjunction with Fig. 4, Fig. 5, use the part of test results that a kind of small spherical wave body hologram memory system of the present invention obtains:
Applied thickness is the Zn (2.0mol.%) of 2.62mm: Fe (0.03wt.%): LiNbO
3Crystal has been measured this system at the multiplexing angular selectivity of rotation.Experimental procedure is as follows:
The first step, choose the other and other input picture that is respectively of right avertence of left avertence of binary image " skin ", about two residing positions of radical on the spatial light modulator are, separate, after having write down left avertence other " moon ", make smaller angle delta θ of crystal rotation write down right avertence other " husband " again.
In second step, make the crystal angle position not change reconstructing hologram.If the hologram that is reproduced is crosstalked, the angle that then increases the crystal rotation repeats first step experiment again.By that analogy, when the hologram that is reproduced was not crosstalked, the angle that crystal rotated thought that then the minimum angles that can separately crosstalk at interval.
Fig. 4 is the experimental result that obtains, and as can be seen from the figure, when Δ θ=0.175 °, does not crosstalk in the hologram that is reproduced.Therefore the selection angle of this system is 0.175 °.After obtaining the choice of crystals angle, during further experiment research rotating crystal, satisfy with the multiplexing angular range of volume.Because the thinner thickness of flat crystal, when crystal rotated, the side-play amount of the intersection point of two-beam in crystal was negligible, only needed to guarantee that this intersection point gets final product on turning axle.In experimental system, the angle of reference light and thing light is 90 °, and the rotatable maximum angle scope of flat crystal is 90 degree.When thing light and reference light during from surperficial incident of crystal, the rotatable angular range of crystal is 45 degree, and two-beam is from another surperficial incident of crystal behind crystal Rotate 180 degree, and it is multiplexing to rotate the miter angle degree equally.Then the crystal single-point store utilizable rotating range be 90 the degree.Minimum angular spacing 0.175 degree that can separately crosstalk when considering stored hologram, the crystal single-point can be stored 500 width of cloth holograms so.We have realized that in experiment single-point stores 100 width of cloth binary images, and wherein the 1st, 30,60,90 and the 100th width of cloth reconstructing hologram as shown in Figure 5.
Claims (3)
1. small spherical wave body hologram memory system, it is made up of light beam filtration module (1) and relevant logging modle (2), it is characterized in that: light beam filtration module (1) optics connects relevant logging modle (2).
2. a kind of small spherical wave body hologram memory system according to claim 1, it is characterized in that: described light beam filtration module (1) comprises laser instrument (3), spatial filter (4) and collimation lens (5), become diverging light behind the light beam process spatial filter (4) that laser instrument (3) sends, become parallel beam by collimation lens (5), the distance between spatial filter (4) and the collimation lens (5) equals the focal length of collimation lens (5).
3. a kind of small spherical wave body hologram memory system according to claim 1, it is characterized in that: described relevant logging modle (2) comprises splitting ratio half-wave plate (6), polarization splitting prism (7), object beam prism (8), spatial light modulator (9), half-wave plate (10), thing light plus lens (11), reference light plus lens (12), reference beam prism (13), catoptron (14), storage medium (15) and translation stage and turntable (16), directional light is polarized Amici prism (7) through splitting ratio after with half-wave plate (6) and is divided into two bundles, a branch of light incides object beam prism (8), locate load image in spatial light modulator (9), then pass through half-wave plate (10) and thing light plus lens (11) becomes the spherical wave converging beam; Become converging beam behind another Shu Guang process reference light plus lens (12), behind reference beam prism (13) and catoptron (14), change direction, two-beam is at storage medium (15) internal interference, storage medium (15) is placed on translation stage and the turntable (16), can change the position and the angle of measuring point.
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| CN200910072737A CN101635150A (en) | 2009-08-26 | 2009-08-26 | Small spherical wave body hologram memory system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882446A (en) * | 2010-05-25 | 2010-11-10 | 中山大学 | Portable optical volume holographic image recognition system |
| CN105319936A (en) * | 2015-12-02 | 2016-02-10 | 哈尔滨工业大学 | Three-dimensional holographic display method based on body holographic storage technology |
| WO2016138723A1 (en) * | 2015-03-02 | 2016-09-09 | 京东方科技集团股份有限公司 | Holographic recording device and holographic recording method |
| CN110992991A (en) * | 2019-12-31 | 2020-04-10 | 广东紫晶信息存储技术股份有限公司 | Holographic data storage device with single-arm structure |
| CN110992990A (en) * | 2019-10-18 | 2020-04-10 | 北京理工大学深圳研究院 | Diffraction phase type holographic storage device |
| CN114121047A (en) * | 2022-01-28 | 2022-03-01 | 煤炭科学研究总院有限公司 | Volume holographic storage system and electronic device |
| CN115380255A (en) * | 2020-05-19 | 2022-11-22 | 元平台技术有限公司 | System and method for holographic wavefront printing |
-
2009
- 2009-08-26 CN CN200910072737A patent/CN101635150A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882446A (en) * | 2010-05-25 | 2010-11-10 | 中山大学 | Portable optical volume holographic image recognition system |
| WO2016138723A1 (en) * | 2015-03-02 | 2016-09-09 | 京东方科技集团股份有限公司 | Holographic recording device and holographic recording method |
| US10261469B2 (en) | 2015-03-02 | 2019-04-16 | Boe Technology Group Co., Ltd. | Hologram recording device and hologram recording method |
| CN105319936A (en) * | 2015-12-02 | 2016-02-10 | 哈尔滨工业大学 | Three-dimensional holographic display method based on body holographic storage technology |
| CN105319936B (en) * | 2015-12-02 | 2018-03-13 | 哈尔滨工业大学 | A kind of three- dimensional panoramic show method based on volume holographicstorage technology |
| CN110992990A (en) * | 2019-10-18 | 2020-04-10 | 北京理工大学深圳研究院 | Diffraction phase type holographic storage device |
| CN110992991A (en) * | 2019-12-31 | 2020-04-10 | 广东紫晶信息存储技术股份有限公司 | Holographic data storage device with single-arm structure |
| CN115380255A (en) * | 2020-05-19 | 2022-11-22 | 元平台技术有限公司 | System and method for holographic wavefront printing |
| CN114121047A (en) * | 2022-01-28 | 2022-03-01 | 煤炭科学研究总院有限公司 | Volume holographic storage system and electronic device |
| CN114121047B (en) * | 2022-01-28 | 2022-04-22 | 煤炭科学研究总院有限公司 | Volume holographic storage system and electronic device |
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Application publication date: 20100127 |