CN111816221A - Covering translation multiplexing type holographic data storage method and storage device - Google Patents
Covering translation multiplexing type holographic data storage method and storage device Download PDFInfo
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- CN111816221A CN111816221A CN202010678045.XA CN202010678045A CN111816221A CN 111816221 A CN111816221 A CN 111816221A CN 202010678045 A CN202010678045 A CN 202010678045A CN 111816221 A CN111816221 A CN 111816221A
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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
- G11B7/004—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
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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
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00772—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track on record carriers storing information in the form of optical interference patterns, e.g. holograms
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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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/083—Disposition or mounting of heads or light sources relatively to record carriers relative to record carriers storing information in the form of optical interference patterns, e.g. holograms
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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
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
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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
- G11B7/1372—Lenses
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24044—Recording layers for storing optical interference patterns, e.g. holograms; for storing data in three dimensions, e.g. volume storage
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B2007/240025—Record carriers characterised by shape, structure or physical properties, or by the selection of the material for storing optical interference patterns, e.g. holograms
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- Optics & Photonics (AREA)
- Holo Graphy (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
The invention belongs to the technical field of information data storage, and discloses a covering translation multiplexing type holographic data storage method and a storage device, wherein the storage method comprises the steps of converging information light and reference light to form a converged light beam; performing holographic data recording on the record carrier by a converging point of the converging light beam; when the convergent light beam records a holographic data image on the record carrier, translating the position of the convergent light beam on the record carrier at a convergent point, wherein the translation offset is smaller than the size of the holographic data image, and then recording the next holographic data image; after a holographic data pattern is recorded on a record carrier by a convergent light beam, the position of the convergent light beam on the record carrier is translated, the offset of translation is smaller than the size of the holographic data pattern, and overlay translation is carried out to realize multiple multiplexing of the record carrier, so that the effect of greatly improving the data storage density is realized.
Description
Technical Field
The invention belongs to the technical field of information data storage, and particularly relates to a method and a device for storing coverage translation multiplexing type holographic data.
Background
At present, with the coming of the data age, higher requirements are put on the storage density and compatibility of data storage, while the storage density of the traditional magnetic storage technology almost reaches the physical limit, and the service life of the storage carrier is shorter, so the optical storage technology is rapidly developed due to the longer service life of the storage carrier. The recording density of the prior art optical storage technology is determined by the size of the optical recording spot on the optical disc, while the optical recording spots need to be in a separate structure, which cannot overlap each other, and the size of the existing optical recording spot has almost reached the minimum value of the physical limit, so that the storage density is also greatly limited. Although the holographic storage technology in the prior art can improve the storage density through the angle transformation of the reference light, i.e. angle multiplexing, the storage structure that changes the angle of the reference light has a rather complicated system structure, and is very susceptible to the interference of environmental vibrations, which affects the storage effect and the product quality.
Disclosure of Invention
The invention provides a covering translation multiplexing type holographic data storage method and a storage device, which are used for solving the problems that the storage density is limited, the system structure is very complex due to the angle change of reference light, the environmental vibration interference is easy to cause, and the storage effect and the product quality are influenced in the prior art.
In one aspect, the present invention provides an overlay shift multiplexing-based holographic data storage method, comprising the steps of,
converging the information light and the reference light to form a converged light beam (1);
holographic data recording is performed on the record carrier by means of a converging point of the converging beam (1);
when the recording of a holographic data pattern (102) by the converging beam (1) on the record carrier is completed, the position of said converging spot of the converging beam (1) on the record carrier is translated by an amount smaller than the size of said holographic data pattern (102), and then the recording of the next said holographic data pattern (102) is performed.
In the above aspect, it is preferable that, when the information light and the reference light are converged, the information light and the reference light are converged into a converging light beam (1) by a converging lens (3).
It is also preferred that the positional translation of the converging beam (1) on the record carrier is achieved by translating the position of the converging lens (3) while translating the converging beam (1) on said converging point on the record carrier.
It is also preferred that the positional translation of the reference beam (1) at said convergent point on the record carrier is achieved by translating the position of the record carrier while translating the convergent beam (1) at said convergent point on the record carrier.
It may also be preferred that the record carrier is a reflective optical disc.
It is also preferable that the reflective optical disc comprises a protective layer (201), a recording layer (202) and a reflective layer (203) from top to bottom.
It is also preferable that the condensing lens (3) or the reflective optical disc is mounted on a servo moving frame (4) of a servo system, a servo motor is in driving connection with the servo moving frame (4), the position of the record carrier is translated in a rotating mode of the reflective optical disc, the servo system acquires position information (103) of the condensing point of the condensing beam (1) on the record carrier while performing servo, and the holographic storage position and the translation interval are determined through the position information (103) provided by the servo system.
Preferably, when the converging lens (3) is arranged on a servo moving frame (4) of the servo system, the converging lens (3) arranged on the servo moving frame (4) is driven by the servo motor to perform servo compensation movement in the transverse radial direction and in the up-and-down direction while the reflective light disc rotates.
Preferably, when the reflective optical disc is mounted on a servo moving frame (4) of a servo system, the reflective optical disc mounted on the servo moving frame (4) is driven by the servo motor to perform servo compensation movement in the transverse radial direction and in the up-down direction while the reflective optical disc rotates.
The invention also provides a storage device for the covering translation multiplexing type holographic data storage method, which comprises an information light source and a reference light source, wherein a converging lens (3) is arranged in the optical axis direction of the information light and the reference light emitted by the information light source and the reference light source, and a converging point of the information light and the reference light after being converged by the converging lens (3) is positioned on a record carrier.
The advantages of the invention are as follows:
the covering translation multiplexing holographic data storage method and the storage device can solve the problems that in the prior art, the storage density is limited, the system structure is very complex due to the angle change of the reference light, the environmental vibration interference is easy to cause, and the storage effect and the product quality are influenced; the covering translation multiplexing type holographic data storage method adopts converged information and reference beams, after a holographic data image is recorded on a record carrier through the converged beams, the positions of the converged beams on the record carrier at a convergent point are translated, the offset of the translation is smaller than the size of the holographic data image, and the covering translation is carried out to realize the multiple multiplexing of the record carrier, thereby realizing the effect of greatly improving the data storage density; the covering translation multiplexing type holographic data storage device is used for implementing the storage method, and high-density data storage with good compatibility is realized.
Drawings
FIG. 1 is a flow chart of the method for storing holographic data by using cover-shift multiplexing.
FIG. 2 is a schematic structural diagram of a storage device according to embodiment 1 of the present invention for an overlay shift multiplexing-type holographic data storage method.
FIG. 3 is a simplified model of a coaxial holographic structure of the overlay shift multiplexing-type holographic data storage method of the present invention.
FIG. 4 is a simplified model of a top view of the overlay shift multiplexing holographic data storage method of the present invention.
FIG. 5 is a diagram illustrating the contribution of phase change to light intensity in the method for covering shift multiplexing holographic data storage according to the present invention.
FIG. 6 is a schematic structural diagram of a storage device of embodiment 2 for an overlay shift multiplexing-type holographic data storage method according to the present invention.
FIG. 7 is a schematic structural diagram of a storage device according to embodiment 3 of the present invention.
Description of reference numerals:
1 is a convergent beam, 101 is a reference beam, 102 is a holographic data pattern, 103 is position information, 104 is a first zero-order point, 201 is a protective layer, 202 is a recording layer, 203 is a reflective layer, 3 is a convergent lens, 4 is a servo moving frame, 5 is an information beam, 6 is a main mirror, 7 is an auxiliary mirror, 8 is a dichroic mirror, 9 is a beam splitter, 10 is a semiconductor laser, 11 is a photodetector, and 12 is a package case.
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings and examples:
example 1:
referring to fig. 1, the overlay shift multiplexing-based holographic data storage method, comprises the steps of,
converging the information light and the reference light to form a converged light beam 1;
holographic data recording is performed on the record carrier by means of the converging point of the converging beam 1;
after the converging beam 1 has recorded a holographic data pattern 102 on the record carrier, the position of the converging spot of the converging beam 1 on the record carrier is translated by an amount smaller than the size of the holographic data pattern 102, and then the next recording of the holographic data pattern 102 is performed.
The storage device for the overlay shift multiplexing type holographic data storage method of the embodiment, referring to fig. 2, includes an information and reference light source, a converging lens 3 is arranged in the optical axis direction of the information light and the reference light emitted by the information and reference light source, and a converging point of the information light and the reference light after being converged by the converging lens 3 is located on a record carrier.
In the above-mentioned method for storing the cover-shift multiplexing type holographic data, when the information light and the reference light are converged, the information light and the reference light may be converged into the converging light beam 1 by the converging lens 3.
In the method for storing holographic data in the overlay shift multiplexing mode according to this embodiment, after a hologram image is recorded by using a converged holographic convergent beam 1, as shown in fig. 3, the recording position of the convergent point is shifted by x, at this time, the phase of the reproduced light b 'from the reference light a' is shifted by x, as shown in fig. 4, the arrow indicates the moving direction, the phase change law generated at different positions of the reproduced reference light for the hologram image before shifting is shown in formula (1), after the phase difference sum of the points on the ring-shaped reference light is shifted by x, which is obtained by integrating the θ angle from 0 to 2 pi, the phase change law generated at different positions of the reproduced reference light is shown in formula (1).
Formula (1), the phase difference contribution of a certain point P to point O after translation is:
where r is the distance between two points of OP.
Equation (2), the total contribution of the phase change of each point on the ring-shaped reference light is considered as:
calculating the integral to obtain a first-order Bessel function J1(x) The graph of this function is shown in fig. 5, and the vertical axis I represents the intensity of the reproduction light and the abscissa represents the reading reference light displacement amount x. It can be seen that when the recording position of the converging point is shifted by an amount larger than the first zero-order point 104 of the first order bessel function, the intensity of the readout reconstruction light of the converging beam 1 can be sharply reduced, if another hologram is recorded at the position, the reconstruction light of the previous hologram will not be affected, and the shift amount is far smaller than the size of the hologram, for example, the shift amount for a hologram with a diameter of 200 micrometers can be 3 micrometers; thereby being able to ensure phaseThe reproduced light read out by the two adjacent converging light beams 1 does not interfere with each other. Wherein the displacement of the converging light beam 1 is smaller than the size of the hologram, which enables to repeatedly cover hundreds to thousands of holograms in any direction within a recording carrier such as a disc surface.
In summary, the recording and storage of the hologram image by the converged converging light beam 1 can realize the overlay type translation multiplexing method, improve the storage density, and ensure the recording and reading of data of the record carrier such as an optical disc in a state of rotating compared with the parallel reference light of the double light beams.
The method for storing the holographic data in the cover-shift multiplexing mode may specifically be implemented by shifting the position of the converging lens 3 when the converging point of the converging beam 1 on the record carrier is shifted, so as to shift the position of the converging point of the converging beam 1 on the record carrier.
Alternatively, the position translation of the converging beam 1 at said converging point on the record carrier is achieved by translating the position of the record carrier when translating said converging point of the converging beam 1 on the record carrier.
More specifically, in the above-mentioned overlay shift multiplexing-type holographic data storage method and storage device, the record carrier is a reflective optical disc. The reflective optical disc comprises a protective layer 201, a recording layer 202 and a reflective layer 203 from top to bottom.
The protective layer 201, the recording layer 202, and the reflective layer 203 of the reflective optical disc are made of organic materials, and are sequentially connected by a glue layer. The light beam passes through the protective layer 201 and the recording layer 202, reaches the reflective layer 203, and is reflected by the reflective layer 203, thereby realizing information storage on the recording layer 202.
Example 2:
the method for storing holographic data in an overlay translation multiplexing mode in embodiment 1 may further specifically be, referring to fig. 6, that the condensing lens 3 or the reflective optical disc is mounted on a servo moving frame 4 of a servo system, a servo motor is in driving connection with the servo moving frame 4, the position of the record carrier is translated by rotating the reflective optical disc, the servo system performs servo and obtains position information 103 of the condensing point of the condensing beam 1 on the record carrier, and the position information 103 provided by the servo system determines the holographic storage position and the translation interval.
In the method for storing holographic data in the cover translation multiplexing mode according to this embodiment, when the focusing lens 3 is mounted on the servo moving frame 4 of the servo system, the focusing lens 3 mounted on the servo moving frame 4 is driven by the servo motor to perform servo compensation movement in the lateral radial direction and in the up-down direction while the reflective optical disc rotates.
In the method for storing holographic data in a cover translation multiplexing mode according to this embodiment, when the reflective optical disc is mounted on the servo moving frame 4 of the servo system, the reflective optical disc mounted on the servo moving frame 4 is driven by the servo motor to perform servo compensation movement in the lateral radial direction and in the up-down direction while the reflective optical disc rotates.
It should be noted that the converging beam 1 is preferably coaxial with the information beam, i.e., the converging beam 1 is coaxial with the information beam of the hologram image to be recorded. Then, in the storage device for the cover shift multiplexing type holographic data storage method of the present embodiment, referring to fig. 3, the optical axis directions of the converging light beam 1, the information light beam 5 and the dichroic mirror 8 are horizontal, the main mirror 6 inclined at 45 ° is disposed behind the converging lens 3, the reflection optical axis of the main mirror 6 is vertical, the reflective optical disk is laterally disposed on the reflection optical axis of the main mirror 6, the disc surface of the reflecting type optical disc is vertical to the reflecting optical axis of the main reflecting mirror 6, the convergent lens 3 is arranged on the servo moving frame 4, the servo motor drives the servo moving frame 4 to drive the convergent lens 3, and when the reflective optical disc rotates, servo displacement compensation movement of the up-down position and/or the transverse left-right position is carried out, so that the three-dimensional holographic recording of data on the reflective optical disc by the convergent light beam 1 and the information light beam 5 reflected by the main reflector 6 is realized.
The light beam emitted by the servo light source semiconductor laser 10 can be reflected by the beam splitter 9 and the auxiliary reflector 7 and then enters the dichroic reflector 8 to realize further reflection, enters the coaxial light path of the light beam 1 participating in the conference, returns to the beam splitter 9 through the original path of the reflective optical disc, and is projected to the photoelectric detector 11 after penetrating through the beam splitter 9 to provide a servo signal for the servo system.
In the storage device for the cover translation multiplexing type holographic data storage method of the embodiment, the convergent lens 3 is mounted on the servo moving frame 4, the servo motor drives the servo moving frame 4 to drive the convergent lens 3, and the convergent light beam 1 and the information light beam 5 reflected by the main reflector 6 perform three-dimensional holographic recording on the reflective optical disc while the reflective optical disc rotates.
The storage device for the covering translation multiplexing type holographic data storage method further comprises a dichroic mirror 8, a beam splitter 9, a semiconductor laser 10 and a photoelectric detector 11, so that a light beam reflected by the dichroic mirror 8 and reaching the beam splitter 9 is combined with a light beam emitted by the semiconductor laser 10 and then transmitted to the photoelectric detector 11, and servo detection during information reproduction is realized. The photodetector 11 may be a multi-phase photo-electric receiving device.
The cover translation multiplexing holographic data storage method and the storage device of the embodiment can perform servo control and addressing by matching with the reflection layer of the reflection type optical disk, avoid the influence of vibration when the optical disk is inscribed, and the recording position of the recording layer is translated on the reflection layer 403, thereby realizing multiple multiplexing.
As an alternative embodiment, the reflective optical disc may also be mounted on the servo moving frame 4, and the servo motor drives the servo moving frame 4 to drive the reflective optical disc to perform compensation movement in the up-down direction and/or the radial direction, so as to reduce the influence of vibration on the operation of the storage device.
Specifically, the servo moving frame 4 may be provided with a fixture, the fixture may include an upper outer casing structure and a lower embedded structure, the embedded structure is embedded in the outer casing structure, and then the convergent lens 3 or the reflective optical disc is installed in a lower end of the embedded structure, so that the embedded structure is driven by the servo motor to perform compensation movement in the up-down direction and/or the radial direction, and the convergent lens 3 or the reflective optical disc is driven to perform compensation movement in the up-down direction and/or the radial direction.
Example 3:
the storage device of embodiment 1 or embodiment 2, referring to fig. 7, can further encapsulate the optical head structure composed of the converging lens 3 and the servo moving frame 4 in the package housing 12 to protect and mount the optical head structure. The package housing 12 may be provided with mounting grooves and holes according to the required mounting position.
Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (10)
1. An overlay shift multiplexing holographic data storage method, comprising the steps of,
converging the information light and the reference light to form a converged light beam (1);
holographic data recording is performed on the record carrier by means of a converging point of the converging beam (1);
when the recording of a holographic data pattern (102) by the converging beam (1) on the record carrier is completed, the position of said converging spot of the converging beam (1) on the record carrier is translated by an amount smaller than the size of said holographic data pattern (102), and then the recording of the next said holographic data pattern (102) is performed.
2. The method of claim 1, wherein the information light and the reference light are converged into a converging light beam (1) by a converging lens (3) when the information light and the reference light are converged.
3. Method for overlaying a translational multiplexing holographic data storage according to claim 1 characterized in that the translational position of the converging beam (1) on the record carrier is achieved by translating the position of the converging lens (3) while translating the converging beam (1) on said converging point on the record carrier.
4. Method for overlaying a translational multiplexing holographic data storage according to claim 1 characterized in that the position of the reference beam (1) on the record carrier is translated by translating the position of the record carrier while translating the convergent beam (1) on said convergent point on the record carrier.
5. The method of claim 1 wherein the record carrier is a reflective optical disc.
6. The method of claim 5, wherein the reflective optical disk comprises a protective layer (201), a recording layer (202), and a reflective layer (203) from top to bottom.
7. The method according to claim 5, wherein the condensing lens (3) or the reflective optical disc is mounted on a servo moving frame (4) of a servo system, a servo motor is in driving connection with the servo moving frame (4), the position of the record carrier is translated by means of rotation of the reflective optical disc, the servo system performs servo and obtains the position information (103) of the condensing point of the condensing beam (1) on the record carrier, and the holographic storage position and the translation interval are determined by the position information (103) provided by the servo system.
8. The method of claim 7, wherein when the condensing lens (3) is mounted on the servo moving frame (4) of the servo system, the condensing lens (3) mounted on the servo moving frame (4) is moved by the servo motor to perform servo compensation movements in the lateral radial direction and in the up-down direction while the reflective optical disc is rotated.
9. The overlay shift multiplexing holographic data storage method according to claim 7 or 8, wherein when the reflective optical disk is mounted on a servo moving frame (4) of a servo system, the reflective optical disk mounted on the servo moving frame (4) is driven by the servo motor to perform servo compensation movement in the lateral radial direction and in the up-down direction while the reflective optical disk rotates.
10. Storage device for use in an overlay shift multiplexed holographic data storage method according to any of claims 1 to 9, comprising an information and reference light source, wherein a converging lens (3) is arranged in the direction of the optical axis of the information light and the reference light emitted by the information and reference light sources, and the converging point of the information light and the reference light after converging by the converging lens (3) is located on the record carrier.
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