WO2015023111A1 - Système de stockage de données holographiques - Google Patents

Système de stockage de données holographiques Download PDF

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Publication number
WO2015023111A1
WO2015023111A1 PCT/KR2014/007493 KR2014007493W WO2015023111A1 WO 2015023111 A1 WO2015023111 A1 WO 2015023111A1 KR 2014007493 W KR2014007493 W KR 2014007493W WO 2015023111 A1 WO2015023111 A1 WO 2015023111A1
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WO
WIPO (PCT)
Prior art keywords
light
lens
polarized light
lens module
beam splitter
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Application number
PCT/KR2014/007493
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English (en)
Korean (ko)
Inventor
김낙영
안병교
Original Assignee
엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to US14/908,472 priority Critical patent/US9620164B2/en
Priority claimed from KR1020140104229A external-priority patent/KR101594374B1/ko
Publication of WO2015023111A1 publication Critical patent/WO2015023111A1/fr

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1395—Beam splitters or combiners
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms

Definitions

  • the present invention relates to a holographic data storage system, and more particularly, to a holographic data recording and reproducing system capable of recording data of a holographic data storage medium.
  • Optical storage technology is widely used in general life. Typical examples are CD (Compact Disc), DVD (Digital Versatile Disc) and Blu-ray.
  • CD Compact Disc
  • DVD Digital Versatile Disc
  • Blu-ray The amount of data to be recorded in the optical storage device is increasingly focused on high integration, miniaturization, and light weight so that a high quality image becomes more widespread and a large amount of data can be recorded.
  • a holographic data storage system using a hologram has been studied in relation to an optical storage method according to a new hysteresis and miniaturization.
  • the parallel data processing method using an LCD, a CCD (or CMOS) or the like can be used as an input / output method to fundamentally increase the data transfer rate, / cm < 2 >.
  • a key principle in high-density recording in holographic data storage systems is that data can be superimposed on the same place in a holographic storage medium without spatial isolation.
  • This technique is called a multiplexing technique.
  • an angle multiplexing technique in which two types of light are irradiated at different angles and superimposed is most widely used.
  • a light source for supplying light oscillating in one direction;
  • a reference lens for irradiating the holographic storage medium with the light supplied from the light source unit;
  • a synthesis module including a spatial light modulator (SLM) for synthesizing digital information into light supplied from the light source and modulating the digital information into a signal beam;
  • a signal lens for irradiating the modulated signal beam with a predetermined angle with the reference lens to record the digital information on the holographic storage medium;
  • a first lens module for transmitting light incident from the light source unit to the spatial light modulator;
  • a second lens module for transmitting the signal beam to the signal lens, wherein at least one of the first lens module or the second lens module includes a first lens module that transmits P- 1 Polarizing Beam Splitter (PBS);
  • a relay lens for collecting light passing through the first polarizing beam splitter;
  • a mirror that passes through the relay lens and reflects the collected light and then makes incident on the relay lens again;
  • a quarter wave plate located
  • the mirror may be located at a focal length of the relay lens.
  • the combining module further comprises a second polarizing beam splitter (PBS) disposed on the front surface of the spatial light modulator, the P polarized light passing through and the S polarized light being reflected,
  • PBS polarizing beam splitter
  • the first lens module and the second lens module may be disposed at right angles to the polarizing beam splitter.
  • the first lens module and the second lens module may be disposed at right angles to the polarizing beam splitter.
  • the spatial light modulator when the P-polarized light is supplied from the first lens module, the spatial light modulator is disposed to face the first lens module with the second polarizing beam splitter as a center, and the S-polarized light
  • the spatial light modulator may be disposed at a right angle to the first lens module centering on the second polarization beam splitter.
  • CMOS complementary metal-oxide semiconductor
  • a half wave plate disposed between the second polarizing beam splitter and the second lens module for converting the phase of incident light by? / 2.
  • the half wave plate may be selectively positioned between the second polarizing beam splitter and the second lens module when the signal beam is emitted from the signal lens or when a restoring beam is input to the signal lens.
  • the size of the holographic data storage system can be reduced, and the number of lenses can be reduced to lower the manufacturing cost.
  • FIG. 1 is a perspective view illustrating a conventional holographic data storage system.
  • FIG. 2 is a conceptual diagram illustrating a conventional holographic data storage system.
  • FIG 3 is a view illustrating a path of light when P polarized light is incident on a first lens module of a holographic data storage system according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a holographic data storage system in accordance with an embodiment of the present invention.
  • FIG. 5 is a view illustrating a path of light when S polarized light enters a first lens module of a holographic data storage system according to another embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a holographic data storage system according to another embodiment of the present invention.
  • Figure 7 is a perspective view of the holographic data storage system of Figure 6;
  • FIG. 8 illustrates a process of extracting and reproducing digital information recorded on a holographic storage medium using the holographic data storage system of FIG.
  • FIG. 9 is a flowchart illustrating a process of extracting and reproducing digital information recorded on a holographic storage medium using the holographic data storage system of FIG.
  • FIG. 10 is a view illustrating a second lens module of a holographic data storage system according to another embodiment of the present invention.
  • FIG. 11 is a diagram illustrating a holographic data storage system according to another embodiment of the present invention.
  • FIGS. 12 and 13 illustrate a recording and reproducing process in a holographic storage medium in a holographic data storage system according to another embodiment of the present invention.
  • FIG. 14 and FIG. 15 are diagrams illustrating a recording and reproducing process in a holographic storage medium when the spatial light modulator and the image sensor are changed in position in FIG.
  • Holographic data storage technology is a technology that can record digital information on a holographic storage medium on a page basis. It can store more than 250 times as much data as a DVD, and can store and reproduce data on a page basis. Can also be improved.
  • a holographic data storage technique irradiates a signal beam including digital information and a reference beam as a reference to a holographic storage medium so that an interference pattern formed by the two kinds of light is reflected by the holographic data storage medium, And recorded on a storage medium.
  • the two kinds of light are formed at a predetermined angle and are irradiated to the holographic storage medium.
  • the holographic storage medium may store a plurality of data according to an angle at which two kinds of light are irradiated to the same position of the holographic storage medium. That is, if the angle at which the reference beam and the signal beam are irradiated to the holographic storage medium is changed n times, n digital information is stored in the holographic storage medium, so that a large amount of data can be intensively stored in a small space.
  • CMOS complementary metal-oxide semiconductor
  • the holographic data storage system of the present invention is characterized by reducing the size of the holographic data storage system by improving the system capable of recording and reproducing digital information in a holographic storage medium.
  • FIG. 1 is a perspective view showing a conventional holographic data storage system 1
  • FIG. 2 is a conceptual diagram showing a conventional holographic data storage system 1. As shown in FIG.
  • the holographic data storage system 1 includes a light source 10 for supplying light, reference modules 70 and 80 for irradiating light supplied from the light source 10 to the holographic storage medium 90, And a signal module 20, 30, 40, 50, 60 for synthesizing digital information into the light supplied from the holographic storage medium 90.
  • a reference beam R Light irradiating the holographic data storage medium 90 from the reference modules 70 and 80 is referred to as a reference beam R and light including digital information irradiated from the signal modules 20, 30, 40, 50, Is referred to as a signal beam (S).
  • the light supplied from the light source 10 can be used as the reference beam R without conversion, so that the configuration of the reference modules 70 and 80 is simple.
  • the signal beam S must synthesize digital information to the light supplied from the light source 10
  • the signal modules 20, 30, 40, 50 and 60 are connected to the extension module 20, 30, a synthesis module 40, a second lens module 50, and a signal lens 60.
  • the expansion module 20 includes a beam expander 21 and a phase mask 23.
  • the light supplied from the light source unit 10 is a point light source irradiated at a small point and is extended to the surface light source through the beam expander 21.
  • the light converted into the planar light source is processed and outputted so as to be suitable for synthesizing the digital information into the light through the phase mask 23.
  • the synthesis module 40 includes a spatial light modulator (SLM) 43 for synthesizing digital information with the light supplied from the light source 10.
  • the spatial light modulator 43 converts the incident light into a signal beam S composed of an image composed of bright points and dark points according to an electric signal including digital information.
  • the signal beam S output from the spatial light modulator 43 is radiated onto the holographic storage medium 90 and interference fringes generated when the reference beam R is irradiated at an angle different from that of the combining module 40, And recorded in the graphic storage medium 90.
  • the central part of the light path is light-rich and the light of the outer part is weakly supplied.
  • a plurality of lenses can be arranged to supply a uniform intensity light to the spatial light modulator 43 in order to supply a planar light source having uniform light intensity over the entire area.
  • the signal beam S including the digital information can be processed to uniformly supply the synthesized digital information to the holographic storage medium 90 in a clear manner.
  • the lens modules 30 and 50 constituted by the plurality of superposed lenses include a first lens module 30 which is incident on the combining module 40 and a second lens module 50 which is provided on the output side can do.
  • the first lens module 30 provided on the side to be incident on the combining module 40 processes the light supplied to the combining module 40 for combining images
  • 2 lens module 50 processes the signal beam S synthesized and emitted by the synthesis module 40.
  • the lens modules 30 and 50 are constructed by superposing a plurality of lenses 31a, 31b, 31c, 32a, 32b, 32c, 51a, 51b, 51c, 52a, 52b and 52c, And a rear relay lens 32 for diffusing the collected light again.
  • the front relay lens 31 and the rear relay lens 32 may be configured symmetrically when the area of the incident light is equal to the area of the output light.
  • the front relay lens 31 and the rear relay lens 32 are composed of a plurality of lenses and a plurality of lenses are spaced apart from each other in consideration of the focal length, problems such as a long length of the lens modules 30 and 50 .
  • the present invention can reduce the size of the holographic data storage system by reducing the number of lenses included in the first lens module or the second lens module.
  • FIG. 3 illustrates a first lens module 130 of a holographic data storage system according to an embodiment of the present invention.
  • the first module of the present invention includes a first polarizing beam splitter 135 (PBS) A quarter wave plate 133, a relay lens 131, and a first mirror 137.
  • the quarter wave plate 133 is a quarter wave plate.
  • the first lens module 130 is described, but the second lens module 150 is also applicable.
  • the first polarizing beam splitter 135 is an anisotropic member that transmits P-polarized light and reflects S-polarized light to selectively pass and reflect the light.
  • the light oscillates in a direction perpendicular to the traveling direction, and the oscillating surfaces form oscillating surfaces having various angles with each other, and the light proceeds. Light oscillating in these various directions can be divided into S polarized light oscillating in the vertical direction and P polarized light oscillating in the horizontal direction.
  • the first lens module 130 includes the front relay lens 31 and the rear relay lens 32.
  • the first lens module 130 of the present embodiment includes only one relay lens 131 . The same effect as that of the conventional relay lens 131 can be obtained by passing the light through the one relay lens 131 twice.
  • a first mirror 137 is used to allow light to pass through one relay lens 131 twice. The light passing through the relay lens 131 is collected and reaches the first mirror 137. The first mirror 137 reflects the light back to the relay lens 131 and the reflected light passes through the relay lens 131, .
  • the light reflected by the first mirror 137 passes through the relay lens 131 and is then supplied to the first polarizing beam splitter 135 again. At this time, if the light reflected by the first mirror 137 and then incident on the first polarized beam splitter 135 is P polarized light like the light incident from the light source unit 110, the light reflected from the first mirror 137 There is a problem that it passes through the one polarization beam splitter 135 and returns to the direction in which it is incident again.
  • a quarter wave plate 133 may be interposed between the first and second waveguides 131 and 131.
  • the quarter wave plate 133 is a birefringent plate that causes linearly polarized light to have a phase difference of? / 4.
  • the quarter wave plate 133 passes through the quarter wave plate 133, the linearly polarized light is converted into circularly polarized light.
  • a phase difference is generated by? / 2 so that the P-polarized light is converted into S-polarized light and the S-polarized light is converted into P-polarized light.
  • a phase difference of? / 4 is generated while passing through the 1/4 wave plate 133, and the light reflected by the first mirror 137 and passed through the relay lens 131 again passes through the 1 / 4 wave plate 133, a phase difference of? / 2 is generated compared to the light initially incident on the first lens unit 130.
  • the P-polarized light incident from the light source unit 110 is converted into S-polarized light while passing through the 1/4 wave plate 133 twice, is incident on the first polarizing beam splitter 135, is bent by 90 °, .
  • FIG. 4 illustrates a holographic data storage system 100 to which the first lens module 130 of FIG. 3 is applied.
  • the holographic data storage system 100 of FIG. The size can be reduced.
  • FIG. 5 illustrates a state where light passes through the first lens module 130 when the light supplied from the light source unit 110 is S-polarized light.
  • the first polarization beam splitter 135 A 1/4 wavelength plate 133, a relay lens 131 and a first mirror 137 are arranged in a direction perpendicular to the direction in which the light is incident.
  • the first polarized beam splitter 135 reflects the S polarized light in a direction perpendicular to the first polarized beam splitter 135, passes through the 1/4 wave plate 133 and the relay lens 131, Passes through the first polarization beam splitter 131 and the 1/4 wave plate 133, and is incident on the first polarization beam splitter 135.
  • FIG. 6 is a diagram illustrating a holographic data storage system 100 to which the first lens module 130 of FIG. 5 is applied. Unlike FIG. 4, the first lens module 130 is different in direction.
  • the direction of the first lens may be changed according to the polarization of the light supplied from the light source 110.
  • a half-wave plate for converting the S-polarized light into the P-polarized light or the P-polarized light to the S-polarized light is interposed between the first lens module 130 and the expansion module 120 without switching the direction of the first lens module 130 Light can be transmitted to the combining module 150.
  • FIG. 7 is a perspective view of the holographic data storage system 100 of FIG. 6, wherein the width is reduced (a> b) as compared to the conventional holographic data storage system 1 shown in FIG. 1, Can be reduced.
  • the light output from the first lens module 130 to the combining module 140 is combined with the digital information and output to the signal beam S.
  • the combining module 140 includes the above-described spatial light modulator 143, and the signal beam in which the digital information is synthesized in the spatial light modulator 143 is output again in the incident direction.
  • the combining module 140 may include a second polarization beam splitter 141 to distinguish the direction of incidence and the direction of the output to the combining module 140.
  • the signal beam synthesized by the spatial light modulator 143 is converted into a polarization direction and output. That is, when the P polarized light is incident, S polarized light is outputted from the signal beam outputted, and when the S polarized light is incident, the P polarized light is outputted from the signal beam outputted.
  • the second polarized beam splitter 141 rotates the light in the 90 ° direction and supplies the light to the spatial light modulator 143.
  • the direction of the light incident from the first lens module 130 and the spatial light modulator 143 are arranged in a direction perpendicular to the direction.
  • the second polarized beam splitter 141 Since the signal beam synthesized by the spatial light modulator 143 is modulated into P-polarized light, the second polarized beam splitter 141 passes the signal beam as it is and outputs it to the second lens module 150.
  • the spatial light modulator 143, the second polarization beam splitter 141, and the second lens module 150 are arranged side by side.
  • the second polarized beam splitter 141 passes the signal beam of P polarized light to the spatial light modulator 143 Supply.
  • the direction of the light incident from the first lens module 130 and the spatial light modulator 143 are arranged in a straight line.
  • the second polarized beam splitter 141 reflects the S-polarized signal beam and outputs it to the second lens module 150.
  • the spatial light modulator 143, the second polarization beam splitter 141, and the second lens module 150 are arranged side by side.
  • the second lens module 150 may further include a diaphragm 153.
  • the signal beam synthesized with the digital information in the synthesis module 140 may generate noise, and may further include an aperture stop 153 to remove the noise. Since the noise is not collected at the focal point exactly after passing through the front relay lens 151, it is possible to remove the noise by blocking light that does not converge to the focal point exactly.
  • the size of the aperture of the diaphragm 153 may vary depending on the size of the entire system, and may be in the range of 100 ⁇ m or more and 100 mm or less in diameter.
  • the signal beam passing through the second lens module 150 is irradiated to the holographic storage medium 190 through the signal lens 160.
  • the angle of the signal beam irradiated to the holographic storage medium 190 may be adjusted by adjusting the angle of the mirror 165 that reflects the light output from the second lens module 150.
  • the angle of the reference beam can be adjusted by adjusting the angle of the mirror 185 that reflects the light incident from the light source unit 110.
  • FIG. 8 is a view illustrating a process of extracting and reproducing digital information recorded in the holographic data storage medium 190 using the holographic data storage system 100 of FIG. 4.
  • FIG. The digital information recorded on the holographic storage medium 190 is extracted and reproduced using the system 100.
  • FIG. 8 is a view illustrating a process of extracting and reproducing digital information recorded in the holographic data storage medium 190 using the holographic data storage system 100 of FIG. 4.
  • FIG. The digital information recorded on the holographic storage medium 190 is extracted and reproduced using the system 100.
  • the reference beam When the reference beam is irradiated onto the holographic storage medium 190 in the reference lens 180, the digital information recorded on the holographic storage medium 190 is extracted and the reconstructed beam is incident through the signal lens 180.
  • the restoration beam passes through the second lens module 150 and is supplied to the synthesis module 140.
  • the restoration beam is incident on an image sensor 145 (CMOS: complementary metal-oxide semiconductor) provided in the synthesis module 140, And output an image.
  • CMOS complementary metal-oxide semiconductor
  • the signal beam output from the spatial light modulator 143 passes through the second polarization beam splitter 141,
  • the reconstructed beam is reflected by the second polarized beam splitter 141 and the traveling direction of the light is changed.
  • the signal beam is reflected by the second polarized beam splitter 141, 2 polarized beam splitter 141.
  • the reconstructed beam incident on the second polarized beam splitter 141 can control the polarization of the light irradiated to the holographic storage medium 190 such that the phase difference from the signal beam is? / 2.
  • the image sensor since the image sensor is located in the direction perpendicular to the direction of the restored beam incident on the second lens module 150, the restored beam is S- 6, the image sensor forms a straight line with the direction of the restored beam incident on the second lens module 150, so that the restored beam is P-polarized light.
  • the polarization of the reconstruction beam is determined according to the polarization of the reference beam.
  • the S-polarized reference beam is irradiated to the holographic storage medium 190, and in the embodiment of FIG. 6, It is possible to irradiate the graphic storage medium 190 to determine the polarization of the restored beam.
  • the second lens module may also use one relay lens like the first lens module.
  • the second lens module 250 of the present embodiment includes a third polarization beam splitter 255, a 1/4 wave plate 133, a relay lens 231 and a second mirror 257, The size of the second lens module 250 is reduced by passing light through the first lens module 251 and the second lens module 250 twice.
  • the second lens module 250 since the second lens module 250 needs to remove the noise generated by synthesizing the digital information, the second lens module 250 needs to have a configuration that serves as the diaphragm 153 in the above-described embodiment. In this embodiment, the second lens module 250 reduces the size of the second mirror 257 instead of the diaphragm 153, removes noise that does not converge accurately to focus after passing through the relay lens 251, .
  • the size of the second mirror 257 can be formed corresponding to the size of the diaphragm 253 described above and can be formed in a range of 100 ⁇ m or more and 100 mm or less in diameter.
  • FIG. 11 illustrates a holographic data storage system 200 according to another embodiment of the present invention, in which the holographic data storage system 200 of the present embodiment includes one relay lens 251 , A second mirror 257 and a third polarizing beam splitter 255.
  • the second lens module 250 includes a first polarizing beam splitter 255, The size of the second lens module becomes smaller and the size of the entire system is reduced.
  • the first lens module 230 does not cause a problem because the reconstruction beam incident from the signal lens 260 does not pass through it. However, since the second lens module 250 passes through the reconstruction beam incident from the signal lens 260, The system should be constructed considering the beam path of the beam.
  • the signal beam and the reconstructed beam have a phase difference of? / 2 / RTI > In other words, if the signal beam is P polarized light, the reconstructed beam is S polarized light, and if the signal beam is S polarized light, the reconstructed beam is P polarized light, so that one of the signal beam and the reproduction beam needs to pass through and the other to reflect.
  • the restored beam input to the image sensor 245 passes through the polarizing beam splitters 241 and 255 twice and the third polarizing beam splitter 255 of the second lens module 250
  • the reconstruction beam and the signal beam are moved in the same path, but in the second polarization beam splitter 241, the reconstruction beam and the signal beam must move in different paths.
  • FIGS. 12 and 13 illustrate a first lens module 230, a combining part, a second lens module 250, a half wave plate 248, and a signal lens 260 of the present invention.
  • the spatial light modulator 243 and the second lens module 250 are disposed at right angles with respect to the second polarization beam splitter 241,
  • the signal beam output from the second polarization beam splitter 243 is reflected by the second polarization beam splitter 241 and is incident on the second lens module 250.
  • the light incident on the second lens module 250 is transmitted through the third polarization beam splitter 255 to the relay lens 251 so that the signal beam output from the spatial light modulator 243 is converted into P- Should be.
  • the phase shifter 244 is disposed between the second lens module 250 and the combining module 240 to convert the phase to the P polarized light.
  • the light converted into the P polarized light passes through the 1/4 wave plate 253 and the relay lens 251 to reach the second mirror 257 and the light reflected by the second mirror 257 passes through the relay lens 251 And reaches the third polarizing beam splitter 255 after passing through the 1/4 wave plate 253.
  • the signal beam converted into the P polarized light by the half wave plate 248 is converted again into S polarized light while passing through the 1/4 wave plate 253 twice and is reflected by the third polarized beam splitter 255, (260).
  • the restored beam incident through the signal lens 260 is deflected by the third polarized beam splitter 255 of the second lens module 250 using the same S-polarized light as the signal beam output through the signal lens 260
  • Light can be introduced into the relay lens 251.
  • the light having passed through the second lens module 250 passes through the 1/4 wave plate 253 twice and is converted into P polarized light.
  • the half wave plate 248, the light is converted into S polarized light
  • the restored beam can not be transmitted to the image sensor 245 disposed in parallel with the second lens module 250 and the half wave plate 248 is removed when the image stored in the holographic storage medium 290 is output.
  • the half wave plate 248 is inserted when the holographic data is stored and the half wave plate 248 is omitted at the time of holographic data reproduction so that one relay lens 251 and the third polarized beam splitter 255 and 1/4 It is possible to provide the holographic storage system 200 to which the second lens module 250 including the wave plate 253 is applied.
  • the first lens module 230 and the second lens module 250 may be configured to receive the S-polarized light from the light source 210.
  • the half wave plate 248 can be further interposed between the two plates.
  • the P polarized light emitted from the first lens module 230 by the half wave plate 248 is converted into S polarized light and is incident on the spatial light modulator 243 and the signal beam synthesized with the digital information in the spatial light modulator 243 is converted into P And is converted into polarized light.
  • the P-polarized signal beam passes through the second polarization beam splitter 241 and the third polarization beam splitter 255 and reaches the 1/4 wave plate 253 of the second lens module 250.
  • the signal beam converted into the S polarized light after passing through the 1/4 wave plate 253 and the relay lens 251 twice is reflected by the third polarizing beam splitter 255 and passes through the signal lens 260 to the holographic storage medium (290).
  • a restored beam including digital information stored in the holographic storage medium 290 is incident through the signal lens 270 as shown in FIG. 15, it is supplied to the synthesis module 240 through the second lens module 250 A restored beam of S-polarized light is incident.
  • the reconstruction beam is reflected by the third polarization beam splitter 255, passes through the 1/4 wave plate 253 and the relay lens 251 twice, and is converted into P-polarized light.
  • the second polarization beam splitter 241 receives the restored beam, the reconstructed beam is incident on the spatial light modulator 243 instead of the image sensor 245.
  • the reconstructed beam is converted into S polarized light by changing the phase by? / 2, 248 are interposed between the second polarizing beam splitter 241 and the second lens module 250.
  • the half wave plate 248 is interposed between the second lens module 250 and the synthesizing unit only at the time of reproduction, and the half wave plate 248 can be omitted at the time of recording.
  • the half wave plate 248 may be physically interposed or removed, and a half wave plate 248 may be implemented using a material having an anisotropic property depending on whether current is applied or not.
  • the size of the holographic data storage system 200 can be reduced, and the number of lenses can be reduced to lower manufacturing costs.

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  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

La présente invention concerne un système de stockage de données holographiques caractérisé en ce qu'il comprend : un premier diviseur de faisceau de polarisation (PBS), un premier module de lentille et/ou un second module de lentille transmettant une lumière polarisée P et réfléchissant une lumière polarisée S ; une lentille relais collectant la lumière passant par le premier PBS ; un miroir réfléchissant la lumière collectée par la lentille relais en retour vers la lentille relais ; et une lame quart d'onde, située entre un second diviseur de faisceau PBS et la lentille relais, convertissant la lumière émise polarisée linéairement en une lumière polarisée circulairement et convertissant la lumière polarisée circulairement en une lumière polarisée linéairement. Par réduction du volume de la lentille relais, il est possible de diminuer la taille du système de stockage de données holographiques, et par diminution du nombre de lentilles, il est possible de réduire les coûts de fabrication.
PCT/KR2014/007493 2013-08-16 2014-08-12 Système de stockage de données holographiques WO2015023111A1 (fr)

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US201361866548P 2013-08-16 2013-08-16
US61/866,548 2013-08-16
KR10-2014-0104229 2014-08-12
KR1020140104229A KR101594374B1 (ko) 2013-08-16 2014-08-12 홀로그래픽 데이터 스토리지 시스템

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980041786A (ko) * 1996-11-21 1998-08-17 모리시카 요이찌 광학픽업
KR20030045824A (ko) * 2000-10-12 2003-06-11 가부시키가이샤 옵트웨어 광정보 기록 장치 및 방법, 광정보 재생 장치 및 방법,광정보 기록재생 장치 및 방법, 및 광정보 기록 매체
KR20060083896A (ko) * 2005-01-18 2006-07-21 소니 가부시끼 가이샤 원반 제조 장치, 원반 제조 방법 및 광기록 매체
US20090129238A1 (en) * 2007-11-19 2009-05-21 Takeshi Shimano Objective lens
KR20090071125A (ko) * 2007-12-27 2009-07-01 주식회사 대우일렉트로닉스 광정보 처리장치와 이를 위한 광학계

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980041786A (ko) * 1996-11-21 1998-08-17 모리시카 요이찌 광학픽업
KR20030045824A (ko) * 2000-10-12 2003-06-11 가부시키가이샤 옵트웨어 광정보 기록 장치 및 방법, 광정보 재생 장치 및 방법,광정보 기록재생 장치 및 방법, 및 광정보 기록 매체
KR20060083896A (ko) * 2005-01-18 2006-07-21 소니 가부시끼 가이샤 원반 제조 장치, 원반 제조 방법 및 광기록 매체
US20090129238A1 (en) * 2007-11-19 2009-05-21 Takeshi Shimano Objective lens
KR20090071125A (ko) * 2007-12-27 2009-07-01 주식회사 대우일렉트로닉스 광정보 처리장치와 이를 위한 광학계

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