CN100437771C - Coaxial read-write lens of holographic optical disk storage - Google Patents
Coaxial read-write lens of holographic optical disk storage Download PDFInfo
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- CN100437771C CN100437771C CNB2006100120795A CN200610012079A CN100437771C CN 100437771 C CN100437771 C CN 100437771C CN B2006100120795 A CNB2006100120795 A CN B2006100120795A CN 200610012079 A CN200610012079 A CN 200610012079A CN 100437771 C CN100437771 C CN 100437771C
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Abstract
The present invention relates to a coaxial read-write lens of a holographic optical disc memory, which belongs to the technical field of optical storage. The optical axes of all devices of the laser read-write lens are on an identical axial line. A spatial light modulator (2) is positioned on the front focal plane of a front element Fourier transform lens (3), the back focus of the front element Fourier transform lens (3) is coincident with the front focus of a rear element Fourier transform lens (8), a holographic optical disc (10) is placed near the back focal plane of the front element Fourier transform lens (3), and an area array photocoupling device (9) is positioned on the focal plane of the rear element Fourier transform lens (8). A first annular spherical reflector (5) and second annular spherical reflector (6) form a front focal plane of a lens assembly for placing a random phase plate (4), and a back focal plane is coincident with the back focal plane of the front element Fourier transform lens (3). The present invention can reduce the volume of a holographic optical disc memory, is convenient for developing a single beam read-write system with smaller volume and stronger function, and is conductive to the practicability and the commercialization of a holographic optical disc memory.
Description
Technical field
The present invention relates to the coaxial read-write lens of holographic optical disk memory, belong to field of optical storage technology.
Background technology
Holographic optical disk memory is as a kind of novel HIGH-DENSITY OPTICAL STORAGE system, because its memory capacity is big, highly redundant degree, fast message transmission rate and short every advantage of access time, further moving towards practicability.
Recent years, except photorefractive material, organically photopolymer as the body holographic storage material obtained develop rapidly, its physicochemical property is compared with being greatly improved in the past, because this material is fit to make large tracts of land disc type material very much, the cost of producing in enormous quantities is also cheaper, makes it more and more might develop into the commercial holographic optical disk that is similar to traditional CD-ROM, DVD-ROM.Along with the continuous research of various countries scientific worker to body holographic storage technology and mechanism, adopt thing light and the coaxial coaxial body hologram memory system of reference light to become an important research direction, it can make the read-write lens of similar conventional optical disc, dwindle the volume of volume hologram memory, be beneficial to and move towards commercialization.
In order to make the holographic optical disk technology further move towards practicability, be necessary to make read-write system more to simplify, make it compatible to some extent with existing CD drive.In the common holographic optical disk storage system thing light and reference light from the system of axle owing on light channel structure, need a light beams is divided into two-beam, walk different paths separately, need independently lens system, so more complicated on the structure is difficult to again volume-diminished.So be necessary to make the shared same light path of signal beams of object beam and reference light (reading light), the simple compact coaxial optical system of development is an important developing direction.Even adopt thing light and the coaxial system of reference light at present, also be to make thing light and the shared a pair of fourier transform lens of reference light.Yet, according to body holographic memory theory, when thing light and reference light adopted coaxial system with a pair of fourier transform lens, the angle of object beam and reference beam was very little, so holographic multiplexing angular selectivity is very poor, be unfavorable for improving the storage density of holographic optical disk.Especially the holographic optical disk that organic photopolymer material is made is difficult to make very thick medium, and its angular selectivity is just more bad like this.Therefore be necessary to design a kind of coaxial laser read-write lens that both can realize that thing light and reference light were coaxial, also be necessary to solve the too small problem of the two beam angle, improve with this and be beneficial to the holographic optical disk storage density and move towards practicability.
Summary of the invention
The objective of the invention is for the angle of the excessive problem of the holographic optical disk memory thing light that solves above-mentioned proposition and reference light off-axis optical system volume and thing light and the shared a pair of fourier transform lens of reference light too small and influence the problem of angular selectivity, a kind of in-line holographic compact disk laser read-write lens that utilizes the annular sphere catoptron is proposed, not only can effectively reduce the size of holographic optical disk memory optical system, and can increment light and the angle of reference light, effectively improve the angular selectivity of holographic memory, improve storage density.
The present invention adopts the technology of reference light being carried out phase coding, can further improve selectivity, suppresses the multiplexing middle crosstalk noise that occurs of storage.
The coaxial read-write lens of the holographic optical disk memory that the present invention is designed, concrete structure is referring to Fig. 1.Laser read-write lens 11 of the present invention is made up of spatial light modulator 2, preceding group of fourier transform lens 3, random order phase-plate 4, the first annular sphere catoptron 5, the second annular sphere catoptron 6, veiling glare diaphragm 7, back group fourier transform lens 8, face battle array photoelectric coupled device 9, and the optical axis of all devices is on same axis.Organize on the front focal plane of fourier transform lens 3 before its spatial light modulator 2 is positioned at, the back focus of preceding group fourier transform lens 3 overlaps with the front focus of back group fourier transform lens 8, holographic optical disk 10 is positioned near the back focal plane of preceding group fourier transform lens 3, face battle array photoelectric coupled device 9 is positioned on the back focal plane of back group fourier transform lens 8.The first annular sphere catoptron 5 and the second annular sphere catoptron 6 form the front focal plane of lens group and place random order phase-plate 4, and back focal plane overlaps with the back focal plane of preceding group of fourier transform lens 3.
When recorded hologram, the center of the collimated laser beam 1 of a branch of process beam-expanding collimation is as object beam, be radiated on the spatial light modulator 2, the image information of required storage is loaded, after passing through preceding group of fourier transform lens 3 then, make object beam 20 form the spectrum face at the back focal plane of preceding group of fourier transform lens 3.The center external annular section of collimated laser beam 1 is as reference light, behind random order phase-plate 4, form the reference light 19 of random phase coding, this light beam irradiates is on the surface of the first annular sphere catoptron 5, reflex to the second annular sphere catoptron, 6 surfaces by the first annular sphere catoptron 5 then, the focal position of group fourier transform lens 3 before converging to.The object beam zero level spectrum of this bundle reference light and preceding group of fourier transform lens 3 back focal planes forms interferes hologram, holographic optical disk 10 is positioned near the back focal plane of preceding group fourier transform lens 3, can interfere hologram record to get off this, realize the in-line holographic storage.
This in-line holographic is stored in data when writing and reading, and reference light shutter 13 and object beam shutter 17 be effective clear aperature of corresponding reference beams and object beam respectively, controls the open and close of object beam and reference beam.Write fashionablely, reference light shutter 13 and object beam shutter 17 all are opening, and when reading, object beam shutter 17 is closed, and reference light shutter 13 is opened.Interference hologram with record on the reference light irradiation holographic optical disk 10, through after organize fourier transform lens 8 after, and make holographic optical disk be positioned at the front focal plane of back group fourier transform lens 8, placed side battle array photoelectric coupled device 9 on the back focal plane position of back group fourier transform lens 8, surface at face battle array photoelectric coupled device 9 just can be reproduced the image data information of record, realizes reading of data.The annular diaphragm that veiling glare diaphragm 7 wherein is made up of the absorbing light material of an annular is used for stopping the reference light through behind the holographic optical disk 10, can remove the veiling glare interference that this light forms, and also satisfies playback light information simultaneously and passes through.
Wherein, for the collimated laser beam 1 of the laser read-write lens 11 that shines this in-line holographic optical disc memory, beam energy that object beam and reference beam distributed or facula area respectively account for half of this collimated laser beam 1.The picture number formulary value aperture of the lens group of being made up of the first annular sphere catoptron 5 and the second annular sphere catoptron 6 and the picture number formulary value aperture difference of preceding group of fourier transform lens 3 are between 0.4～0.7, make angle through the convergent beam of the first annular sphere catoptron 5 reflection and object beam 20 between 30 °～60 °, effectively the angle of increment light and reference light improves the angular selectivity of holographic multiplexing storage.Reference light can further improve selectivity after encoding through the random order phase-plate, suppresses the multiplexing middle crosstalk noise that occurs of storage.Random order phase-plate 4 is positioned at the front focal plane position of the lens group that is formed by the first annular sphere catoptron 5 and the second annular sphere catoptron 6, and the back focal plane position of the lucky and preceding group fourier transform lens 3 of back focal plane of the lens group that first Perimeter Truss Reflector 5 and the second annular sphere catoptron 6 form overlaps.
Back focal plane out of focus 1～5mm scope of going forward of group fourier transform lens 3 before holographic optical disk 10 is positioned at, the material of holographic optical disk can be photorefractive crystal or photopolymer.
The present invention adopt same light beam just can realize in the holographic optical disk memory hologram record with read, effectively utilized the energy of same beam laser, simplified traditional from axle holographic memory light path, can dwindle the volume of holographic optical disk memory, be convenient to develop the littler single beam read-write system with better function of volume, help to make holographic optical disk memory to move towards practicability and commercialization.
Description of drawings
Fig. 1, the laser read-write lens synoptic diagram of in-line holographic optical disc memory;
1. 9. laser read-write lens 19. reference beams 20. object beams of a battle array photoelectric coupled device 10. holographic optical disks 11. in-line holographic optical disc memorys of fourier transform lenses (FTL2) are organized in the 4. annular random order phase-plate 5. first annular sphere catoptrons of group fourier transform lens (FTL1) 6. second annular sphere catoptrons 7. veiling glare diaphragms 8. backs before collimated laser beam 2. spatial light modulators 3.
Fig. 2, the optical system synoptic diagram of in-line holographic optical disc memory;
12. laser instrument 13. reference light shutters 14. expand bundle filtering colimated light system 15. Gaussian beam homogenising devices 16. first plane mirrors 17. object beam shutters 18. second plane mirrors.
Embodiment
Have explanation the preferred embodiments of the present invention below in conjunction with accompanying drawing.
Embodiment:
See Fig. 2, the perpendicular linear polarization Gaussian beam of coming out from laser instrument 12 is through reference light shutter 13, then by after expanding bundle filtering colimated light system 14 realizations expansion bundle, filtering collimation, through Gaussian beam homogenising device 15, light beam is become the uniform hot spot of illumination, then through first plane mirror 16, beam deflection arrives second plane mirror 18 for 90 ° then, wherein the core of light beam is through shutter 17, form collimated laser beam 1 through plane mirror 18 reflection backs then, the spot diameter of collimated laser beam 1 is 55mm.When recorded hologram, the center of collimated laser beam 1 is as object beam, spot diameter is 27mm, be radiated on the spatial light modulator 2, spatial light modulator 2 be positioned at before the group fourier transform lens 3 front focal plane on (preceding work focal length is 88.433mm), the image information of required storage is loaded, pass through preceding group of fourier transform lens 3 then after, make object beam 20 form the spectrum face at the back focal plane (back work focal length 41.698mm) of preceding group of fourier transform lens 3.The annular section of collimated laser beam 1 is as reference light, after the ring-shaped light spot diameter is 36mm (interior ring) and 55mm (outer shroud) process random order phase-plate 4, form the reference light 19 of random phase coding, this light beam irradiates is on the surface of the first annular sphere catoptron 5, the curvature of this catoptron is-72mm, whole reference lighies can be reflexed to the second annular sphere catoptron, 6 surfaces, by the second annular sphere catoptron 6-the curvature surface of 258mm, the focal position of group fourier transform lens 3 before reference light converged to.The object beam zero level spectrum of the reference light of this beam convergence and preceding group of fourier transform lens 3 back focal planes forms interferes hologram, holographic optical disk 10 is positioned near the back focal plane of preceding group fourier transform lens 3, can interfere hologram record to get off this, realize the in-line holographic storage.
This in-line holographic is stored in data when writing and reading, and reference light shutter 13 and object beam shutter 17 be effective clear aperature of corresponding reference beams and object beam respectively, controls the open and close of object beam and reference beam.Write fashionablely, reference light shutter 13 and object beam shutter 17 all are opening, and when reading, object beam shutter 17 is closed, and reference light shutter 13 is opened.Interference hologram with record on the reference light irradiation holographic optical disk 10, through after organize fourier transform lens 8 after, and make holographic optical disk be positioned at the front focal plane (preceding work focal length 27.310mm) of back group fourier transform lens 8, (back work focal length 39.996mm) placed side battle array photoelectric coupled device 9 on the back focal plane position of back group fourier transform lens 8, surface at face battle array photoelectric coupled device 9 just can be reproduced the image data information of record, realizes reading of data.
Subordinate list is should be with the design parameter of lens shaft 11 among the embodiment
Group fourier transform lens 3 basic design parameters (mm) before the table 1
Group fourier transform lens 8 basic design parameters (mm) before the table 2
The design parameter of table 3 Perimeter Truss Reflector (mm)
Claims (4)
1, the coaxial read-write lens of holographic optical disk memory comprises spatial light modulator (2), preceding group of fourier transform lens (3), random order phase-plate (4), back group fourier transform lens (8), face battle array photoelectric coupled device (9); Organize on the front focal plane of fourier transform lens (3) before spatial light modulator (2) is positioned at, the back focus of preceding group fourier transform lens (3) overlaps with the front focus of back group fourier transform lens (8), the back focal plane of preceding group fourier transform lens (3) is positioned near the holographic optical disk (10), face battle array photoelectric coupled device (9) is positioned on the back focal plane of back group fourier transform lens (8), it is characterized in that: also comprise the first annular sphere catoptron (5), the second annular sphere catoptron (6); Wherein, the optical axis of all devices is on same axis, and the first annular sphere catoptron (5) and the second annular sphere catoptron (6) form the front focal plane of lens group and place random order phase-plate (4), and back focal plane overlaps with the back focal plane of preceding group of fourier transform lens (3).
2, the coaxial read-write lens of holographic optical disk memory according to claim 1, it is characterized in that: also comprise the veiling glare diaphragm (7) that is used for stopping through the reference light behind the holographic optical disk (10), be positioned between holographic optical disk and the back group fourier transform lens (8).
3, the coaxial read-write lens of holographic optical disk memory according to claim 1 and 2 is characterized in that: the back focal plane of preceding group of fourier transform lens (3) is positioned at the preceding 1～5mm scope of holographic optical disk (10).
4, according to the coaxial read-write lens of claim 1 or 2 each described holographic optical disk memories, it is characterized in that: the picture number formulary value aperture of the lens group of being made up of the first annular sphere catoptron (5) and the second annular sphere catoptron (6) and the picture number formulary value aperture difference of preceding group of fourier transform lens (3) are between 0.4～0.7.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100120795A CN100437771C (en) | 2006-06-01 | 2006-06-01 | Coaxial read-write lens of holographic optical disk storage |
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| CNB2006100120795A CN100437771C (en) | 2006-06-01 | 2006-06-01 | Coaxial read-write lens of holographic optical disk storage |
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| CN100437771C true CN100437771C (en) | 2008-11-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455394A (en) * | 2003-05-30 | 2003-11-12 | 中国科学院上海光学精密机械研究所 | Holographic optical disk storage device for optical fiber guided polarization multiplexing |
| CN1470053A (en) * | 2000-10-12 | 2004-01-21 | 光技术企业公司 | Optical information recording apparatus and method optical information reproducing apparatus and method, optical information recording/reproducing apparatus and method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1470053A (en) * | 2000-10-12 | 2004-01-21 | 光技术企业公司 | Optical information recording apparatus and method optical information reproducing apparatus and method, optical information recording/reproducing apparatus and method |
| CN1455394A (en) * | 2003-05-30 | 2003-11-12 | 中国科学院上海光学精密机械研究所 | Holographic optical disk storage device for optical fiber guided polarization multiplexing |
Non-Patent Citations (2)
| Title |
|---|
| 光致聚合物和全息光盘存储. 陈仲裕.记录媒体技术，第1期. 2004 * |
| 盘式体全息存储关键技术研究. 万玉红.中国优秀博硕士学位论文全文数据库. 2005 * |
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| CN1851811A (en) | 2006-10-25 |
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