CN216362047U - Recording and reproducing apparatus for increasing hologram recording speed in cross-shift multiplexing - Google Patents
Recording and reproducing apparatus for increasing hologram recording speed in cross-shift multiplexing Download PDFInfo
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Abstract
The utility model provides a recording and reproducing device for improving the recording speed of a hologram in cross-shift multiplexing, which comprises a light source, a reference light path, a signal light path, a reading device and a medium platform; the light source is divided into reference light and signal light, and the reference light and the signal light interfere on a storage medium supported by the medium platform and form a hologram; reproducing signal light carrying data information when the reference light is irradiated on a position where the hologram is recorded on the medium; the reading device is used for reading the data information reproduced by the reference light; the medium platform also comprises a medium moving device, the medium moving device is used for translating and/or rotating the storage medium supported by the medium platform, and the optical axis direction of the signal light is perpendicular to the storage medium; the reference optical path includes a reference optical path rotating structure for rotating about an optical axis of the signal light. The device changes the vector direction of the grating formed by interference by rotating the optical head, realizes cross multiplexing recording of the hologram, does not need complex position movement of the medium, and reduces the position control requirement of the medium.
Description
Technical Field
The present invention relates to the field of holographic storage, and more particularly, to a recording and reproducing apparatus for increasing a hologram recording speed in cross-shift multiplexing.
Background
Spherical reference light shift multiplexing recording is a method of recording holograms using spherical waves as reference light. The medium is moved a small distance after recording a hologram, and the reproduced light intensity of the hologram is close to zero because the Bragg matching condition is difficult to satisfy after the spherical wave is moved, so that a new hologram can be recorded after the shift without crosstalk with the previous hologram, thereby realizing the shift multiplexing recording.
The principle of shift multiplex recording is shown in fig. 1. In shift multiplexing recording, signal light and spherical reference light are incident on a medium at different predetermined angles. In general, the grating vector direction of the signal light and the reference light interference recording is on a plane determined by the optical axes of the signal light and the reference light.
As shown in fig. 2, shift multiplex recording is achieved by controlling the relative movement of the medium and the head along the plane, i.e. the displacement of the medium is along the direction of the grating vector. In this way, cross-talk between adjacent holograms can be avoided if the medium is shifted in the direction of the grating vector and in the direction perpendicular to the grating vector by a fixed interval, for example 1 μm, 2 μm, 5 μm and 500 μm, respectively. On the other hand, the number of multiplexing times can be further increased by improving the performance of the storage medium. As shown in fig. 3, on the basis of shift multiplexing, cross-overlay recording of holograms can be performed by rotating the medium in its plane by an angle of about 15 °, 30 °, 45 ° or more.
Fig. 4 and 5 show a method of performing such cross-shift multiplex recording on an optical disc. In fig. 4, the optical head is set at position a and position B with respect to the direction of the center of the medium, respectively, shift-multiplex recording is performed by moving the medium in the direction of the arrow, and after recording of one line is completed, the medium is rotated by a small angle to perform shift-multiplex hologram recording of the next line. The holograms recorded by the optical head at the position A and the position B have a grating vector angle of 180 degrees, thereby realizing the cross multiplexing of 180 degrees.
Fig. 5 shows a method of performing cross-multiplex recording at another angle. In the method, the optical head is moved to a position C and a position D with respect to the center of the medium, and the medium is subjected to shift multiplexing recording along an arrow shown in fig. 5, thereby realizing hologram recording with a specific angle grating vector.
However, recording on such an optical disc medium requires moving the optical disc medium over a long distance, which results in an increase in the volume of the optical disc drive and a decrease in the access speed.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to overcoming at least one of the above-mentioned drawbacks of the prior art and providing a recording and reproducing apparatus for improving a recording speed of a hologram in cross-shift multiplexing for solving the problems of an increase in volume of an optical disc drive and a decrease in access speed caused by a need to move an optical disc medium over a long distance when performing shift multiplexing recording/reading of a hologram on a storage medium.
The technical scheme adopted by the utility model comprises the following steps:
a recording and reproducing apparatus for increasing a hologram recording speed in cross-shift multiplexing includes a light source, a reference light path, a signal light path, a reading device, and a medium stage; the light source is divided into two beams, wherein reference light which is transmitted to the storage medium through the reference light path and does not carry data information is adopted, and signal light which is transmitted through the signal light path and carries data information is adopted; the reference light and the signal light interfere on a storage medium supported by a medium platform, and interference fringes are recorded in the storage medium through exposure to form a hologram; when the reference light irradiates on the position of the storage medium where the holographic image is recorded, the signal light carrying the data information can be reproduced; the reading device is used for reading the data information reproduced by the reference light; the media platform also includes a media movement device for translating and/or rotating a storage medium supported by the media platform.
The utility model provides a recording and reproducing device for improving the reading and writing speed of a hologram in cross-shift multiplexing, which comprises:
(1) if the optical axis direction of the incident signal light is perpendicular to the storage medium, the optical axis of the signal light can be used as a rotation axis of the reference light, the reference light path comprises a reference light path rotating structure for rotating around the optical axis of the signal light, specifically, the reference light path rotating structure is formed by assembling a reference light objective lens, a half-wave plate and a polarization beam splitter prism in the reference light path, and the reference light objective lens, the half-wave plate and the polarization beam splitter prism are assembled into a whole body capable of rotating around the optical axis of the signal light.
(2) If the direction of the optical axis of the incident reference light is perpendicular to the storage medium, the optical axis of the reference light can be used as a rotation axis of the signal light, and the signal light path comprises a signal light path rotation structure for rotating around the optical axis of the reference light.
Further, when the half-wave plate, the polarization beam splitter prism and the Fourier lens in the signal light path rotate around the optical axis of the reference light, the reading device also rotates along with the half-wave plate, the polarization beam splitter prism and the Fourier lens in the signal light path, so that the reading device can accurately detect the data information reproduced by the reference light.
(3) If the incident directions of the signal light and the reference light are not perpendicular to the storage medium, an axis perpendicular to the direction of the storage medium is taken as a rotating axis, the signal light path and the reference light path comprise a rotating structure for rotating around the axis perpendicular to the direction of the storage medium, specifically, the rotating structure is formed by assembling a half-wave plate, a reflecting prism and a Fourier lens in the signal light path, and a reference light objective lens and a polarization beam splitting prism in the reference light path together, and the half-wave plate, the reflecting prism and the Fourier lens in the signal light path, and the reference light objective lens and the polarization beam splitting prism in the reference light path together form a whole body capable of rotating around the axis perpendicular to the direction of the storage medium.
Further, when the half-wave plate, the reflecting prism and the Fourier lens in the signal light path rotate around an axis perpendicular to the direction of the storage medium, the reading device also rotates along with the reflecting prism and the Fourier lens in the signal light path, so that the reading device can accurately detect the data information reproduced by the reference light.
That is, the azimuth angle of the incident surface can be changed by rotating the whole of the reference optical path and the signal optical path, so that the grating vector direction of the recorded hologram is changed, and a plurality of holograms with different grating vector directions can be recorded in a multiplexing way on the same recording position.
Further, the reference optical path and the signal optical path share a segment of optical path, and the shared segment of optical path includes: the tunable semiconductor laser comprises a tunable semiconductor laser, a plurality of reflectors, a deformable prism, an optical isolator, a plurality of half-wave plates, an acousto-optic modulator, a beam expander, a polarization beam splitter prism, a plurality of Fourier lenses and a Nyquist aperture.
Compared with the prior art, the utility model has the beneficial effects that: the method provided by the utility model realizes the cross multiplexing recording of the hologram by rotating the optical head to change the vector direction of the grating formed by interference. The process adopts the rotation of the optical head to replace the complex position movement of the medium, reduces the position control requirement of the storage medium, simplifies the moving mechanism of the storage medium, and has relatively small volume and faster access speed.
Drawings
Fig. 1 is a schematic diagram of a spherical wave shift multiplex recording in the background art of the present invention.
Fig. 2 is a schematic diagram of vector directions of a reference light, a signal light and a hologram grating in the background art of the present invention.
Fig. 3 shows a cross-shift multiplexing recording method in a square medium according to the background art of the present invention.
Fig. 4 is a schematic diagram of cross-shift multiplexing in a circular optical disc medium in the background of the utility model.
Fig. 5 is a schematic diagram of cross-shift multiplexing in a circular optical disc medium in the background of the utility model.
Fig. 6 is a schematic view showing the vector directions of the reference light, the signal light, and the hologram grating in embodiment 1 of the present invention.
Fig. 7 is a schematic diagram showing the distribution of the grating vector directions in the cross-shift multiplexing recording in embodiment 1 of the present invention.
Fig. 8 is a schematic structural diagram of a cross-shift multiplexing recording and reproducing apparatus according to embodiment 1 of the present invention.
Fig. 9 is a schematic structural diagram of a cross-shift multiplexing recording and reproducing apparatus according to embodiment 1 of the present invention.
Fig. 10 is a schematic structural diagram of a cross-shift multiplexing recording and reproducing apparatus according to embodiment 1 of the present invention.
FIG. 11 is a flowchart illustrating steps S1-S4 according to embodiment 2 of the present invention.
Fig. 12 is a schematic diagram of cross-shift multiplexing in a circular optical disc medium in embodiments 2 and 3 of the present invention.
Fig. 13 is a schematic diagram of cross-shift multiplexing in a circular optical disc medium in embodiments 2 and 3 of the present invention.
Fig. 14 is a schematic diagram of cross-shift multiplexing in a square medium in embodiments 2 and 3 of the present invention.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the utility model. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 8, the present embodiment provides a recording and reproducing apparatus for increasing a hologram recording speed in cross-shift multiplexing, including a light source, a reference optical path, a signal optical path, a reading apparatus, and a medium stage.
The light source is divided into two beams, reference light which is transmitted to the storage medium through the reference light path and does not carry data information is adopted, and signal light which is transmitted through the signal light path and carries data information is adopted.
The reference light and the signal light interfere on a storage medium 150 supported by a medium stage, and interference fringes are recorded in the storage medium by exposure to form a hologram; the signal light carrying data information can be reproduced when the reference light is irradiated on a position of the storage medium 150 where the hologram is recorded and has the same wavefront as that at the time of recording.
The reading device is used for reading the data information reproduced by the reference light, and the reading device is specifically a CMOS camera 140. After the signal light carrying the data information passes through the fourth fourier lens 114, the projected two-dimensional image information is collected by the reading device CMOS camera 140 and decoded and read.
The media platform also includes a media movement device for translating and/or rotating the storage media 150 supported by the media platform.
As shown in fig. 8, the direction of the optical axis of the incident signal light is perpendicular to the storage medium 150, that is, the optical axis of the signal light is in the perpendicular direction, and the reference light objective lens 130, the half-wave plate 54 and the second polarization beam splitter prism 92 in the reference optical path are assembled as a whole rotatable about the optical axis of the signal light.
When the reference light objective lens 130, the fourth half-wave plate 54 and the second polarization beam splitter prism 92 in the reference light path are assembled into a whole body which can rotate around the optical axis of the signal light, the azimuth angle of the reference light incident on the storage medium 150 can be controlled by controlling the rotation of the whole body, as shown in fig. 6 and 7, and by changing the azimuth angle of the reference light incident on the storage medium 150 to change the grating vector direction of the recorded hologram, a plurality of holograms with different grating vector directions can be recorded on the same recording position of the storage medium 150, thereby realizing the cross-multiplexing of the holograms.
Specifically, as shown in fig. 8, the reference optical path and the signal optical path of the apparatus provided in the present embodiment share one optical path, and the shared one optical path includes: the tunable semiconductor laser device comprises a tunable semiconductor laser 10, a first reflecting mirror 21, a second reflecting mirror 22, a third reflecting mirror 23, an anamorphic prism 30, an optical isolator 40, a first half-wave plate 51, a second half-wave plate 52, an acousto-optic modulator 60, a beam expander 70, an aperture filter 80, a first polarization beam splitter prism 91, a first Fourier lens 111, a second Fourier lens 112 and a Nyquist aperture 120.
Specifically, the recording and reproducing apparatus operates as follows: the tunable semiconductor laser 10 outputs a light beam, the light beam sequentially passes through the second reflector 22, the first reflector 21, the anamorphic prism 30, the optical isolator 40, the first half-wave plate 51, the acousto-optic modulator 60, the third reflector 23, the second half-wave plate 52, the beam expander 70 and the small-aperture filter 80, the light beam is separated into a reference beam and a signal beam through the first polarization beam splitter 91, the signal beam enters the fourth reflector 24, is reflected to the spatial light modulator 100 through the fourth reflector 24, loads a signal, is combined with the reference beam after being reflected by the first polarization beam splitter 91, the reference beam and the signal beam jointly pass through the first fourier lens 111, the nyquist small aperture 120 and the second fourier lens 112, the reference beam and the signal beam are separated through the second polarization beam splitter 92, the reference beam enters the fourth half-wave plate 54 and enters the storage medium 150 through the reference beam objective 130, the signal beam is incident on the third fourier lens (signal light objective lens) 113 and then is incident on the storage medium 150, and is subjected to interference exposure with the reference beam on the storage medium 150 supported by the medium stage to generate a hologram.
If the same recording position needs to be subjected to cross multiplexing, the whole assembled by the reference light objective lens 130, the fourth half-wave plate 54 and the second polarization beam splitter prism 92 rotates around the optical axis of the signal light, the azimuth angle of the reference light incident on the storage medium 150 is controlled by controlling the rotation of the whole, and the vector direction of the hologram recorded by interference exposure with the signal light is changed by changing the azimuth angle of the reference light incident on the storage medium 150, so that a plurality of holograms with different grating vector directions can be recorded on the same recording position of the storage medium 150, and the cross multiplexing of the holograms is realized.
If the shift multiplexing recording of the hologram is to be performed on the storage medium, the storage medium 150 supported by the medium platform is translated and/or rotated by the medium moving device to implement the shift multiplexing recording of the hologram.
If a hologram recorded on the storage medium needs to be reproduced, the hologram is irradiated on the storage medium 150 through the same optical path by using the same reference beam to reproduce signal light carrying data information, and the signal light carrying data information is projected on the readout device CMOS camera 140 after passing through the fourth fourier lens 114. If the holograms recorded at the same recording position by cross-multiplexing are to be reproduced, the azimuth angle at which the reference beam is incident on the storage medium 150 is changed by controlling the above-described overall rotation rotatable about the optical axis of the signal beam, so that a plurality of holograms which are cross-multiplexed are reproduced.
The recording and reproducing apparatus for improving the recording speed of the hologram changes the incident direction of the reference light by the above-mentioned whole rotatable around the optical axis of the signal light, so that the grating vector direction of the hologram is changed, and a plurality of holograms with different grating vector directions can be recorded at the same position in a multiplexing manner.
As shown in fig. 9, this embodiment also provides another recording and reproducing apparatus for increasing the hologram recording speed in cross-shift multiplexing, in which the incident direction of the reference light is perpendicular to the storage medium 150, that is, the optical axis of the reference light is in the perpendicular direction. Meanwhile, a half-wave plate 53 is added in front of the polarization beam splitter prism 92 to change the polarization direction of the reference light and the signal light, so that the reference light is transmitted by the polarization beam splitter prism 92, and the signal light is reflected by the polarization beam splitter prism 92. The third fourier lens (signal light objective lens) 113, the half-wave plate 54 and the polarization beam splitting prism 92 in the signal light path are assembled as one body rotatable around the optical axis of the signal light.
The azimuth angle of the incident plane is changed by the whole body capable of rotating around the optical axis of the reference light so as to change the azimuth angle of the grating vector of the hologram, thereby multiplexing and recording a plurality of holograms with different grating vector directions at the same position.
As shown in fig. 10, the present embodiment also provides another recording and reproducing apparatus for improving the reading and writing speed of holograms in cross-shift multiplexing. The incident directions of the signal light and the reference light are not perpendicular to the storage medium 150. And a half-wave plate 53 is added behind the polarization beam splitting prism 92 to change the polarization direction of the signal light. The half-wave plate 54 is removed so that the polarization directions of the reference light and the signal light are the same. The half-wave plate 53, the reflecting prism 160 and the third fourier lens (signal light objective lens) 113 in the signal light path, and the reference light objective lens 130 and the second polarization beam splitter prism 92 in the reference light path are assembled together into a whole body which can rotate around the vertical direction; the vertical direction is a direction perpendicular to the storage medium 150.
The incident azimuth angles of the reference light and the signal light are changed through the whole body capable of rotating around the vertical direction to change the grating vector azimuth angle of the hologram, so that a plurality of holograms with different grating vector directions can be multiplexed and recorded on the same recording position of the same hologram line.
Example 2
As shown in fig. 11, the present embodiment provides a method for increasing a hologram recording speed in cross-shift multiplexing, comprising the steps of:
the position of the head relative to the storage medium is fixed.
Step S1 is executed: a hologram is formed by interference exposure of a reference beam and a signal beam carrying input information at a recording position of an optical head in a storage medium for recording data information.
Step S2 is executed: shift-multiplex recording of holograms is performed over the entire storage medium using a shift-multiplex method.
As shown in fig. 12, the storage medium is a disk, and in the first step, the storage medium is translated in a radial direction to perform shift multiplexing recording in the radial direction, and in the second step, the storage medium is rotated around a center of a circle by a certain angle and then translated in the radial direction to perform shift multiplexing recording in another radial direction.
As shown in fig. 13, the storage medium is a disk, and in the first step, the storage medium is rotated around the center of the circle to perform shift multiplexing recording on the circular track, and in the second step, the storage medium is moved a distance in the radial direction and then rotated around the center of the circle to perform shift multiplexing recording on the other circular track.
As shown in fig. 14, the storage medium is a square plate, and the first step translates the storage medium in a direction along a first edge of the storage medium to perform shift-multiplexed recording on the track; and the second step returns the storage medium to the original position, moves a distance along the direction of the second side, and then translates the storage medium along the direction of the first side to make the storage medium perform shift multiplexing recording on another track.
Step S3 is executed: rotating the optical head to change the direction of the grating vector, and repeating the steps S1-S2 to record the holograms with different grating vector directions on the whole storage medium, thereby realizing the cross multiplex recording of the holograms; changing the azimuth of the entrance face by rotating the optical head about a rotation axis, thereby changing the azimuth of the recorded holographic grating inside the medium.
And when the direction of the optical axis of the incident signal light is vertical to the storage medium, the reference light is rotated around the optical axis of the signal light by taking the optical axis of the signal light as a rotating axis.
When the optical axis directions of the incident reference light and the signal light are not perpendicular to the storage medium, rotating an optical system formed by the reference light and the signal light around a rotating shaft, wherein the rotating shaft is perpendicular to the storage medium.
And when the optical axis direction of the incident reference light is perpendicular to the storage medium, the signal light is rotated around the optical axis of the reference light by taking the optical axis of the reference light as a rotating axis.
Step S4 is executed: repeating step S3 completes the cross-shift multiplexing recording on the entire storage medium.
Preferably, the reference light is a spherical wave.
The present embodiment provides a method for increasing the recording speed of holograms, and the method can realize cross-multiplex recording of holograms by rotating the optical head to change the vector direction of the grating formed by interference in step S3. The process adopts the rotation of the optical head to replace the complex position movement of the medium, reduces the position control requirement of the storage medium, simplifies the moving mechanism of the storage medium, and has relatively small volume and faster access speed.
Example 3
The present embodiment provides a method for increasing the hologram reading speed in cross-shift multiplexing, when the optical axis direction of the incident signal light is perpendicular to the storage medium or when the optical axis directions of the incident reference light and the signal light are not perpendicular to the storage medium, using the same reference light as that used in recording, to reproduce the recorded hologram at any recording position on the storage medium by linear shift multiplexing and changing the azimuth angle of the incident plane, specifically including the following steps: r1: the optical head outputs a beam of specific reference light to irradiate the recording position of the hologram in the storage medium to read the hologram; r2: moving the optical disk to make the optical head align with all the holograms recorded in the shift multiplexing mode in turn to carry out the shift multiplexing reading of the whole storage medium; r3: rotating the optical head to change the incidence direction of the reference light, repeating the steps R1-R2, reading the holograms with different grating vector directions on the whole storage medium, and realizing the cross multiplexing reading of the holograms; r4: repeating step R3 completes the cross-shift multiplexed reading across the storage medium.
The present embodiment further provides another method for increasing the hologram reading speed in cross-shift multiplexing, when the optical axis direction of the incident reference light is perpendicular to the storage medium, using the same one of reference light as above, to receive the other emergent direction reconstruction light on the storage medium through linear shift multiplexing and rotation of the reading device, and reconstructing the recorded hologram at any recording position on the storage medium, including the following steps: r1: the optical head outputs a beam of specific reference light to irradiate the recording position of the hologram in the storage medium to read the hologram; r2: setting a reading device in one direction, moving the optical disk, and making the optical head align with all the holograms recorded in the shift multiplexing mode in sequence to carry out the shift multiplexing reading of the whole storage medium; r3: rotating the reading device to receive the reproduction light in other emergent directions, repeating the steps R1-R2, reading the holograms with different grating vector directions on the whole storage medium, and realizing the cross multiplexing reading of the holograms; r4: repeating step R3 completes the cross-shift multiplexed reading across the storage medium.
The present embodiment further provides another method for increasing the hologram reading speed in cross-shift multiplexing, when the optical axis direction of the incident reference light is perpendicular to the storage medium, by using the same one of reference lights as above, a method for simultaneously receiving all outgoing direction reproduction lights on the storage medium through linear shift multiplexing and setting a plurality of reading devices, and reproducing the recorded hologram at any recording position on the storage medium, specifically including the following steps: r1: the optical head outputs a beam of specific reference light to irradiate the recording position of the hologram in the storage medium to read the hologram; r2: setting reading devices in multiple directions, receiving the reproduction light of multiple crossed holographic gratings, and reading parallel data; r3: moving the optical disk to make the optical head align with all the holograms recorded in the shift multiplexing mode in turn to carry out the shift multiplexing reading of the whole storage medium; r4: repeating step R3 completes the cross-shift multiplexed reading across the storage medium.
Specifically, in step R2, moving the optical disc so that the optical head sequentially aligns all the holograms recorded in the shift multiplexing mode for shift multiplexing reading of the entire storage medium specifically includes:
as shown in fig. 12, when the storage medium is circular, the storage medium is first translated in the radial direction to perform shift multiplexing reading in the radial direction, and then the storage medium is rotated around the center of the circle by a certain angle and then translated in the radial direction to perform shift multiplexing reading in the other radial direction.
As shown in fig. 13, when the storage medium is circular, the storage medium is rotated around the center of the circle to perform shift multiplexing reading on the circular track, and then the storage medium is moved a distance in the radial direction and then rotated around the center of the circle to perform shift multiplexing reading on the other circular track.
As shown in fig. 14, when the storage medium is rectangular, the storage medium is translated in the direction of the first side of the storage medium to perform shift-multiplexing reading on the track, and then the storage medium is returned to the original position and moved in the direction of the second side of the storage medium for a distance, and then the storage medium is translated in the direction of the first side of the storage medium to perform shift-multiplexing reading on the other track.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (8)
1. A recording and reproducing apparatus for increasing a hologram recording speed in cross-shift multiplexing includes a light source, a reference light path, a signal light path, a reading device, and a medium stage;
the light source is divided into two beams, wherein reference light which is transmitted to the storage medium through the reference light path and does not carry data information is adopted, and signal light which is transmitted through the signal light path and carries data information is adopted;
the reference light and the signal light interfere on a storage medium supported by a medium platform, and interference fringes are recorded in the storage medium through exposure to form a hologram; when the reference light irradiates on the position of the storage medium where the hologram is recorded, the signal light carrying the data information can be reproduced; the reading device is used for reading the data information reproduced by the reference light;
the media platform further comprising a media movement device for translating and/or rotating a storage medium supported by the media platform,
the optical axis direction of the signal light is perpendicular to the storage medium;
the reference optical path includes a reference optical path rotating structure for rotating around an optical axis of the signal light.
2. The recording and reproducing apparatus according to claim 1, wherein the reference optical path shares an optical path with the signal optical path, the shared optical path including: the tunable semiconductor laser comprises a tunable semiconductor laser, a plurality of reflectors, a deformable prism, an optical isolator, a plurality of half-wave plates, an acousto-optic modulator, a beam expander, a polarization beam splitter prism, a plurality of Fourier lenses and a Nyquist aperture.
3. A recording and reproducing apparatus for increasing a hologram recording speed in cross-shift multiplexing includes a light source, a reference light path, a signal light path, a medium stage, and a reading device;
the light source is divided into two beams, wherein reference light which is transmitted to the storage medium through the reference light path and does not carry data information is adopted, and signal light which is transmitted through the signal light path and carries data information is adopted;
the reference light and the signal light interfere on a storage medium supported by a medium platform, and interference fringes are recorded in the storage medium through exposure to form a hologram; the signal light carrying data information can be reproduced when the reference light is incident on a position where a hologram is recorded in the storage medium; the reading device is used for reading the data information reproduced by the reference light;
the media platform further comprising a media movement device for translating and/or rotating a storage medium supported by the media platform,
the optical axis direction of the reference light is perpendicular to the storage medium;
the signal light path comprises a signal light path rotating structure which is used for rotating around the optical axis of the reference light.
4. The recording and reproducing apparatus according to claim 3, wherein when the half-wave plate, the Fourier lens and the polarization beam splitting prism in the signal optical path are rotated about the optical axis of the reference light, the reading means are also rotated with the half-wave plate, the Fourier lens and the polarization beam splitting prism in the signal optical path.
5. The recording and reproducing apparatus according to any one of claims 3 to 4, wherein said reference optical path and said signal optical path share an optical path, the shared optical path including: the tunable semiconductor laser comprises a tunable semiconductor laser, a plurality of reflectors, a deformable prism, an optical isolator, a plurality of half-wave plates, an acousto-optic modulator, a beam expander, a polarization beam splitter prism, a plurality of Fourier lenses and a Nyquist aperture.
6. A recording and reproducing apparatus for increasing a hologram recording speed in cross-shift multiplexing includes a light source, a reference light path, a signal light path, a medium stage, and a reading device;
the light source is divided into two beams, wherein reference light which is transmitted to the storage medium through the reference light path and does not carry data information is adopted, and signal light which is transmitted through the signal light path and carries data information is adopted;
the reference light and the signal light interfere on a storage medium supported by a medium platform, and interference fringes are recorded in the storage medium through exposure to form a hologram; the signal light carrying data information can be reproduced when the reference light is incident on a position where a hologram is recorded in the storage medium; the reading device is used for reading the data information reproduced by the reference light;
the media platform further comprising a media movement device for translating and/or rotating a storage medium supported by the media platform,
the optical axis directions of the signal light and the reference light are not perpendicular to the storage medium;
the signal optical path and the reference optical path include a rotation structure for rotating about an axis perpendicular to the direction of the storage medium.
7. The recording and reproducing device according to claim 6, wherein when the half-wave plate, the reflection prism and the fourier lens in the signal optical path are rotated about an axis perpendicular to the direction of the storage medium, the reading device is also rotated with the half-wave plate, the reflection prism and the fourier lens in the signal optical path.
8. The recording and reproducing apparatus according to any one of claims 6 to 7, wherein said reference optical path and said signal optical path share an optical path, the shared optical path including: the tunable semiconductor laser comprises a tunable semiconductor laser, a plurality of reflectors, a deformable prism, an optical isolator, a plurality of half-wave plates, an acousto-optic modulator, a beam expander, a polarization beam splitter prism, a plurality of Fourier lenses and a Nyquist aperture.
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