CN1588541A - Single light beam digital holographic optical disc read and write device - Google Patents
Single light beam digital holographic optical disc read and write device Download PDFInfo
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- CN1588541A CN1588541A CN 200410052909 CN200410052909A CN1588541A CN 1588541 A CN1588541 A CN 1588541A CN 200410052909 CN200410052909 CN 200410052909 CN 200410052909 A CN200410052909 A CN 200410052909A CN 1588541 A CN1588541 A CN 1588541A
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Abstract
The invention is a single-beam digital holographic CD read/write device, and its construction: there is a laser, a beam-expansion filter system, a first Fourier lens and a second Fourier lens coaxially arranged on an optical axis, there is a space optical modulator between the beam-expansion filter system and the first Fourier lens, there is a digital holographic CD between the two Fourier lenses, there is a CCD camera behind the second Fourier lens, and a computer is connected with the laser, the space optical modulator, the digital holographic CD and the CCD camera through cables. It largely reduces the complexity in the read/write of traditional digital holographic memory by using double-beam light path, reduces the requirements on optical parameters and mechanical accuracy of the system, and also largely reduces the size of system and reduces the cost.
Description
Technical field
The present invention relates to the digital hologram CD, particularly a kind of single beam digitizing holographic optical disk read-write equipment.
Background technology
The development of the development of infotech, especially multimedia technology and digitizing high-definition television technology more and more presses for the mass memory technology with super-high density and superelevation transfer rate.High-density digital holographic storage technology because can be implemented in is simultaneously carried out the said three-dimensional body storage and is reached the super-high density mass memory and reach the superelevation transfer rate with the page format concurrent reading and concurrent writing in the material, it can reach 10 in theory
2Bite/ μ m
2Above storage density and 10
3The rate of information throughput of MB/s, and become one of important focus of current optical information storage research field.At present influence the main cause of high-density digital holographic memory practicability except the high-density digital holographic storage material that does not have desirable dry method online treatment; Another main cause is exactly the twin-beam digitizing holographic memory device that people utilize the classic method design of body holographic memory, complex structure, bulky, the cost costliness, system's shockproof properties is poor, main is that beam collimation needs superhigh precision and complicated automatic control technology with aiming in these devices, to various element machinery precision prescribed height, be unfavorable for the dynamic read-write of digitizing holographic memory, in process of the test, often need many computing machines to carry out accurate control, cause the huge device of digitizing body holographic memory only can in the laboratory, work, be difficult to become miniaturization practicability product cheaply.
Therefore be badly in need of seeking new read-write equipment now and solve the problems referred to above.The people such as Hideta Mitsuhashi of Japanese Keio of calendar year 2001 university, designed a kind of single beam digitizing hologram storage method, greatly reduce the complicacy of device, but the method that they propose is to utilize the spatial structure of photorefractive crystal to realize, thereby can only be applicable to the hologram memory medium of crystal shape with special spatial structure, consider the structure and the optics setting of real crystal, this method is not easy to realize the digitizing holographic memory of super-high density, and cannot be used to it is presently believed that the plate-like polymer thick film storage medium of most possible practicability.The report of relevant this respect is not also seen at present at home.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of single beam digitizing holographic optical disk read-write equipment, mainly solve twin-beam digitizing holographic optical disk read-write equipment complex structure, bulky, cost is high and the problem of poor stability.
Technical conceive of the present invention is to utilize single beam to replace twin-beam, utilizes the partial wave face interference technique of shaking to carry out the information record of digital hologram CD in single beam.
Technical solution of the present invention is as follows:
A kind of single beam digitizing holographic optical disk read-write equipment, the formation that it is characterized in that this device is to be provided with laser instrument on an optical axis coaxially, expand the bundle filtering system, first fourier transform lens and second fourier transform lens, expanding the photomodulator that has living space between the bundle filtering system and first fourier transform lens, between first fourier transform lens and second fourier transform lens, be the digitizing holographic optical disk, after second fourier transform lens, be ccd video camera, one computing machine is respectively by cable and laser instrument, spatial light modulator, the digitizing holographic optical disk links to each other with ccd video camera, wherein first fourier transform lens and second fourier transform lens constitute the 4f optical system of Fourier transform holographic memory, it is spatial light modulator, first fourier transform lens, the digitizing holographic optical disk, level interval between second fourier transform lens and the ccd video camera is the focal distance f of fourier transform lens, spatial light modulator and ccd video camera lay respectively on the input face and output face of this 4f system, but not coaxial, the digitizing holographic optical disk is placed on the frequency plane of 4f optical system.
Described digitizing holographic optical disk is circular, the mechanism that this digitizing holographic optical disk has mechanism that the axis by core rotates and radially moves along the diameter of level by the center of circle.
3, single beam digitizing holographic optical disk read-write equipment according to claim 1 is characterized in that described digitizing holographic optical disk (5) for square, and this digitizing holographic optical disk (5) has in two mechanisms that orthogonal directions moves perpendicular to optical axis.
Described digitizing holographic optical disk is made of plate-like digitizing hologram memory medium.
The aperture that described expansion bundle filtering system expands bundle back light beam is 30---50mm, and the aperture of filtering aperture is 20---50 μ m.
Described spatial light modulator is the electrical addressing transmission-type liquid crystal display device, and transmissivity is greater than 10%, and contrast was greater than 400: 1, and all less than the diameter that expands bundle filtering system output beam, resolution is less than 800 * 600 for size in length and breadth.
The aperture of the 4f optical system of described Fourier transform holographic memory is more than or equal to the diameter that expands bundle filtering system output beam, and first fourier transform lens and second fourier transform lens are that relative aperture is 0.5 standard fourier transform lens.
The pixel size of described ccd video camera and resolution are identical with spatial light modulator.
The method of utilizing above-mentioned single beam digitizing holographic optical disk read-write equipment to write down and read comprises following concrete job step:
1. computing machine is opened laser instrument, the light beam that laser instrument sends expands bundle filtering through expanding the bundle filtering system, adjust the diameter that expands bundle back light beam, make the beam area that expands behind the bundle effective light transmission area, and the penetrating light intensity of the penetrating light intensity of remainder and spatial light modulator is as far as possible near 1: 1 greater than spatial light modulator;
2. computing machine is presented at digitized coded message on the spatial light modulator, light beam perpendicular projection through expanding bundle is in the plane at spatial light modulator place, wherein pass through the light beam part of spatial light modulator, the modulation that is subjected to digital signal becomes the thing light of holographic recording, and the segment beam by spatial light modulator is not the reference light of digitizing holographic recording, adjusts the bottom that spatial light modulator is located at hot spot that light beam becomes up and down;
3. computer control digitizing holographic optical disk makes above-mentioned reference light and thing light converge at the record position of digitizing holographic optical disk through first fourier transform lens, and two-beam is interfered in CD media, forms the Fourier transform hologram, to realize the digitizing holographic recording;
When 4. reading, computing machine close space photomodulator, make it light tight fully, reference beam with former recording process converges the record position that is incident upon the digitizing holographic optical disk, this reference light is reproduced in the thing light page of record on the light-sensitive surface of ccd video camera, this information is sent computing machine back to by ccd video camera and is decoded, and realizes reading of digital hologram canned data.
The present invention has reduced the traditional digital holographic memory widely and has utilized the twin-beam light path to carry out the complicacy of read-write system, has reduced the requirement to system optics parameter and mechanical precision, also reduced widely system size, reduced cost.
Description of drawings:
Fig. 1 is a single beam holographic optical disk read-write equipment sketch of the present invention.
Fig. 2 is the part of the above-mentioned index path of the present invention.
Among the figure:
1-laser instrument, 2-expand bundle filtering system, 3-spatial light modulator, 4-first fourier transform lens, 5-digital hologram CD, 6-second fourier transform lens, 7-CCD video camera, 8-microcomputer.
Embodiment
See also Fig. 1 earlier, Fig. 1 is a single beam holographic optical disk read-write equipment sketch of the present invention.As seen from the figure, the formation of single beam digitizing holographic optical disk read-write equipment of the present invention is to be provided with laser instrument 1 on an optical axis coaxially, expand bundle filtering system 2, first fourier transform lens 4 and second fourier transform lens 6, expanding the photomodulator 3 that has living space between the bundle filtering system 2 and first fourier transform lens 4, between first fourier transform lens 4 and second fourier transform lens 6, be digitizing holographic optical disk 5, after second fourier transform lens 6, be ccd video camera 7, one computing machine 8 is respectively by cable and laser instrument 1, spatial light modulator 3, digitizing holographic optical disk 5 links to each other with ccd video camera 7, dot among the figure, wherein first fourier transform lens 4 and second fourier transform lens 6 constitute the 4f optical system of Fourier transform holographic memory, it is spatial light modulator 3, first fourier transform lens 4, digitizing holographic optical disk 5, level interval between second fourier transform lens 6 and the ccd video camera 7 is the focal distance f of fourier transform lens, spatial light modulator 3 and ccd video camera 7 lay respectively on the input face and output face of this 4f system, but not coaxial, digitizing holographic optical disk 5 is placed on the frequency plane of 4f optical system.
Described digitizing holographic optical disk 5 is circular, digitizing holographic optical disk 5 should write down the digitizing holographic information on vertical axis by core rotates with the track that is implemented in the CD same radius, and CD can also radially move with the enterprising line item of the track that is implemented in different radii along the diameter of level by the center of circle; The mechanism that this digitizing holographic optical disk 5 has mechanism that the axis by core rotates and radially moves along the diameter of level by the center of circle.Not shown in the figures, this mechanism is not hard to imagine, for example promotes the mechanism that disk rotates from the disk border of this digitizing holographic optical disk 5, and this mechanism is again in a certain radially mechanism movably of this digitizing holographic optical disk 5.
Described digitizing holographic optical disk 5 is square, and this digitizing holographic optical disk 5 has in two mechanisms that orthogonal directions moves perpendicular to optical axis, carries out record to be implemented on the CD each position.
Described digitizing holographic optical disk 5 is made of plate-like digitizing hologram memory medium.Sell off polymkeric substance, photorefractive crystal etc. as photopolymer, light.
The aperture that described expansion bundle filtering system 2 expands bundle back light beam is 30---50mm, and the aperture of filtering aperture is 20---50 μ m.
Described spatial light modulator 3 is the electrical addressing transmission-type liquid crystal display device, and transmissivity is greater than 10%, and contrast was greater than 400: 1, and all less than the diameter that expands bundle filtering system 2 output beams, resolution is less than 800 * 600 for size in length and breadth.
The aperture of the 4f optical system of described Fourier transform holographic memory is more than or equal to the diameter that expands bundle filtering system 2 output beams, and first fourier transform lens 4 and second fourier transform lens 6 are that relative aperture is 0.5 standard fourier transform lens.
The pixel size of described ccd video camera 7 and resolution are identical with spatial light modulator 3.
The method of utilizing above-mentioned single beam digitizing holographic optical disk read-write equipment to write down and read comprises following concrete job step:
1. computing machine 8 is opened laser instrument 1, the light beam that laser instrument 1 sends expands bundle filtering through expanding bundle filtering system 2, adjust the diameter that expands bundle back light beam, make the beam area that expands behind the bundle effective light transmission area, and the penetrating light intensity of the penetrating light intensity of remainder and spatial light modulator 3 is as far as possible near 1: 1 greater than spatial light modulator 3;
2. computing machine 8 is presented at digitized coded message on the spatial light modulator 3, light beam perpendicular projection through expanding bundle is in the plane at spatial light modulator 3 places, wherein pass through the light beam part of spatial light modulator 3, the modulation that is subjected to digital signal becomes the thing light of holographic recording, and the segment beam by spatial light modulator 3 is not the reference light of digitizing holographic recording, adjusts the bottom that spatial light modulator 3 is located at hot spot that light beam becomes up and down;
3. computing machine 8 control figure holographic optical disks 5 make above-mentioned reference light and thing light converge at the record position of digitizing holographic optical disk 5 through fourier transform lens 4, and two-beam is interfered in CD media, forms the Fourier transform hologram, to realize the digitizing holographic recording;
When 4. reading, computing machine 8 close space photomodulators 3, make it light tight fully, reference light with former recording process converges the record position that is incident upon digitizing holographic optical disk 5, this reference light is reproduced in the thing light page of record on the light-sensitive surface of ccd video camera 7, this information is sent computing machine 8 back to by ccd video camera 7 and is decoded, and realizes reading of digital hologram canned data.
Provide the important parameter of several embodiment below:
Embodiment 1
Expand the bundle filtering system: output plane light wave beam diameter 50mm, filtering hole diameter 50 μ m.Spatial light modulator: contrast 400: 1, pixel size 32 μ m, resolution 800 * 600.Fourier transform lens: aperture 50mm, focal distance f=100mm.Two fourier transform lens parameters are identical.
Holographic optical disk: with glass is the photopolymer thick film of dish base.Ccd video camera: parameter is identical with spatial light modulator.
According to said method in the summary of the invention, can constitute the read-write equipment of digital hologram CD, each hologram storage 480Kb information.
Embodiment 2
Expand the bundle filtering system: output plane light wave beam diameter 30mm, filtering hole diameter 20 μ m.Spatial light modulator: contrast 800: 1, pixel size 20 μ m, resolution 400 * 400.
Fourier transform lens: aperture 30mm, focal distance f=60mm.Two fourier transform lens parameters are identical.Holographic optical disk: with glass is the photopolymer thick film of dish base.Ccd video camera: parameter is identical with spatial light modulator.
According to said method in the summary of the invention, can constitute the read-write equipment of digital hologram CD, each hologram storage 160Kb information.
Expand the bundle filtering system: output plane light wave beam diameter 50mm, filtering hole diameter 20 μ m.Spatial light modulator: contrast 400: 1, pixel size 20 μ m, resolution 800 * 600.Fourier transform lens: aperture 50mm, focal distance f=100mm.Two fourier transform lens parameters are identical.Holographic optical disk: with glass is the photopolymer thick film of dish base.Ccd video camera: parameter is identical with spatial light modulator.
According to said method in the summary of the invention, can constitute the read-write equipment of digital hologram CD, each hologram storage 480Kb information.
Expand the bundle filtering system: output plane light wave beam diameter 30mm, filtering hole diameter 50 μ m.Spatial light modulator: contrast 800: 1, pixel size 20 μ m, resolution 400 * 400.Fourier transform lens: aperture 30mm, focal distance f=60mm.Two fourier transform lens parameters are identical.
Holographic optical disk: with glass is the photopolymer thick film of dish base.
Ccd video camera: parameter is identical with spatial light modulator.
According to said method in the summary of the invention, can constitute the read-write equipment of digital hologram CD, each hologram storage 160Kb information.
Expand the bundle filtering system: output plane light wave beam diameter 50mm, filtering hole diameter 30 μ m.Spatial light modulator: contrast 400: 1, pixel size 32 μ m, resolution 800 * 600.Fourier transform lens: aperture 50mm, focal distance f=100mm.Two fourier transform lens parameters are identical.
Holographic optical disk: with glass is the photopolymer thick film of dish base.
Ccd video camera: parameter is identical with spatial light modulator.
According to said method in the summary of the invention, can constitute the read-write equipment of digital hologram CD, each hologram storage 480Kb information.
Claims (9)
1, a kind of single beam digitizing holographic optical disk read-write equipment, the formation that it is characterized in that this device is to be provided with laser instrument (1) on an optical axis coaxially, expand bundle filtering system (2), first fourier transform lens (4) and second fourier transform lens (6), expanding the photomodulator (3) that has living space between bundle filtering system (2) and first fourier transform lens (4), between first fourier transform lens (4) and second fourier transform lens (6), be digitizing holographic optical disk (5), at second fourier transform lens (6) is ccd video camera (7) afterwards, one computing machine (8) is respectively by cable and laser instrument (1), spatial light modulator (3), digitizing holographic optical disk (5) links to each other with ccd video camera (7), wherein first fourier transform lens (4) and second fourier transform lens (6) constitute the 4f optical system of Fourier transform holographic memory, be spatial light modulator (3), first fourier transform lens (4), digitizing holographic optical disk (5), level interval between second fourier transform lens (6) and the ccd video camera (7) is the focal distance f of fourier transform lens, spatial light modulator (3) and ccd video camera (7) lay respectively on the input face and output face of this 4f system, but not coaxial, digitizing holographic optical disk (5) is placed on the frequency plane of 4f optical system.
2, single beam digitizing holographic optical disk read-write equipment according to claim 1, it is characterized in that described digitizing holographic optical disk (5) for circular, the mechanism that this digitizing holographic optical disk (5) has mechanism that the axis by core rotates and radially moves along the diameter of level by the center of circle.
3, single beam digitizing holographic optical disk read-write equipment according to claim 1 is characterized in that described digitizing holographic optical disk (5) for square, and this digitizing holographic optical disk (5) has in two mechanisms that orthogonal directions moves perpendicular to optical axis.
4, according to claim 1 or 2 or 3 described single beam digitizing holographic optical disk read-write equipments, it is characterized in that described digitizing holographic optical disk (5) is made of plate-like digitizing hologram memory medium.
5, single beam digitizing holographic optical disk read-write equipment according to claim 1 is characterized in that it is 30 that described expansion bundle filtering system (2) expands the aperture of restrainting the back light beam---50mm, and the aperture of filtering aperture is 20---50 μ m.
6, single beam digitizing holographic optical disk read-write equipment according to claim 1, it is characterized in that described spatial light modulator (3) is the electrical addressing transmission-type liquid crystal display device, transmissivity is greater than 10%, contrast was greater than 400: 1, all less than the diameter that expands bundle filtering system (2) output beam, resolution is less than 800 * 600 for size in length and breadth.
7, single beam digitizing holographic optical disk read-write equipment according to claim 1, the aperture of 4f optical system that it is characterized in that described Fourier transform holographic memory is more than or equal to the diameter that expands bundle filtering system (2) output beam, and first fourier transform lens (4) and second fourier transform lens (6) are that relative aperture is 0.5 standard fourier transform lens.
8, single beam digitizing holographic optical disk read-write equipment according to claim 1 is characterized in that the identical of the pixel size of described ccd video camera (7) and resolution and spatial light modulator (3).
9, the method for utilizing the described single beam digitizing of claim 1 holographic optical disk read-write equipment to write down and read is characterized in that comprising the following concrete course of work:
1. computing machine (8) is opened laser instrument (1), the light beam that laser instrument (1) sends expands bundle filtering through expanding bundle filtering system (2), adjust the diameter that expands bundle back light beam, make the beam area that expands behind the bundle effective light transmission area, and the penetrating light intensity of the penetrating light intensity of remainder and spatial light modulator (3) is as far as possible near 1: 1 greater than spatial light modulator (3);
2. computing machine (8) is presented at digitized coded message on the spatial light modulator (3), light beam perpendicular projection through expanding bundle is in the plane at spatial light modulator (3) place, wherein pass through the light beam part of spatial light modulator (3), the modulation that is subjected to digital signal becomes the thing light of holographic recording, and the segment beam by spatial light modulator (3) is not the reference light of digitizing holographic recording, adjusts the bottom that spatial light modulator (3) is located at hot spot that light beam becomes up and down;
3. computing machine (8) control figure holographic optical disk (5), make above-mentioned reference light and thing light converge at the record position of digitizing holographic optical disk (5) through fourier transform lens (4), two-beam is interfered in CD media, forms the Fourier transform hologram, to realize the digitizing holographic recording;
When 4. reading, computing machine (8) close space photomodulator (3), make it light tight fully, reference light with former recording process converges the record position that is incident upon digitizing holographic optical disk (5), this reference light is reproduced in the thing light page of record on the light-sensitive surface of ccd video camera (7), this information is sent computing machine (8) back to by ccd video camera (7) and is decoded, and realizes reading of digital hologram canned data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052909 CN1270297C (en) | 2004-07-16 | 2004-07-16 | Single light beam digital holographic optical disc read and write device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052909 CN1270297C (en) | 2004-07-16 | 2004-07-16 | Single light beam digital holographic optical disc read and write device |
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| Publication Number | Publication Date |
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| CN1588541A true CN1588541A (en) | 2005-03-02 |
| CN1270297C CN1270297C (en) | 2006-08-16 |
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| CN 200410052909 Expired - Fee Related CN1270297C (en) | 2004-07-16 | 2004-07-16 | Single light beam digital holographic optical disc read and write device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055731B (en) * | 2006-04-13 | 2011-10-12 | 汤姆森特许公司 | Method for wavelength mismatch compensation in a holographic storage system |
| CN107863116A (en) * | 2017-12-06 | 2018-03-30 | 苏州盤谷信息光学有限公司 | A kind of compact disk recording method for increasing memory capacity |
| CN113270119A (en) * | 2021-06-15 | 2021-08-17 | 谭小地 | Holographic optical disk track changing method and track changing device |
| CN114621395A (en) * | 2020-12-11 | 2022-06-14 | 中国科学院上海光学精密机械研究所 | Fluorescent polymer material for single-beam super-resolution optical storage and optical storage method thereof |
-
2004
- 2004-07-16 CN CN 200410052909 patent/CN1270297C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055731B (en) * | 2006-04-13 | 2011-10-12 | 汤姆森特许公司 | Method for wavelength mismatch compensation in a holographic storage system |
| CN107863116A (en) * | 2017-12-06 | 2018-03-30 | 苏州盤谷信息光学有限公司 | A kind of compact disk recording method for increasing memory capacity |
| CN114621395A (en) * | 2020-12-11 | 2022-06-14 | 中国科学院上海光学精密机械研究所 | Fluorescent polymer material for single-beam super-resolution optical storage and optical storage method thereof |
| CN113270119A (en) * | 2021-06-15 | 2021-08-17 | 谭小地 | Holographic optical disk track changing method and track changing device |
| CN113270119B (en) * | 2021-06-15 | 2022-05-24 | 谭小地 | Holographic optical disk track changing method and track changing device |
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| CN1270297C (en) | 2006-08-16 |
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