WO2015107669A1 - 情報記録装置及び情報記録方法 - Google Patents
情報記録装置及び情報記録方法 Download PDFInfo
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- WO2015107669A1 WO2015107669A1 PCT/JP2014/050755 JP2014050755W WO2015107669A1 WO 2015107669 A1 WO2015107669 A1 WO 2015107669A1 JP 2014050755 W JP2014050755 W JP 2014050755W WO 2015107669 A1 WO2015107669 A1 WO 2015107669A1
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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
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/128—Modulators
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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
- G11B7/0045—Recording
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
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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
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
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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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored 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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0033—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with cards or other card-like flat carriers, e.g. flat sheets of optical film
Definitions
- the present invention relates to an information recording apparatus and an information recording method for recording information on a medium using light.
- Patent Document 1 discusses a three-dimensional memory that records information by using a structural change of a recording medium as a recording bit.
- the laser beam may be divided into a plurality of spots in order to improve the recording speed, and a plurality of bits of information may be recorded simultaneously.
- Non-Patent Document 1 discloses a technique in which laser light is divided into a plurality of spots by a spatial light modulator and irradiated onto quartz glass, and information of a plurality of bits is recorded collectively in the quartz glass.
- the recording speed is the product of the amount of information recorded by one light irradiation and the number of recordings per unit time.
- the number of recordings per unit time is determined by the driving speed of a spatial light modulator that controls the shape of the light spot, a stage that controls the medium position, and the like, and the speed of the apparatus is limited in principle. Therefore, in order to improve the recording speed, it is essential to record a sufficient amount of information by one light irradiation.
- FIG. 1 is an enlarged view showing a recording state when a checkerboard pattern is recorded in the transparent medium, and the x mark in the figure indicates the position of the optical axis. This is because, as shown in FIG. 2, the light spot used for recording expands with distance from the optical axis, and the light intensity decreases.
- none of the above-mentioned conventional examples considers the simultaneous recording of multiple bits exceeding several hundred bits used for information recording and the recording quality, and it is impossible to achieve both the recording quality and the recording speed. It was.
- the present invention has the following configuration.
- a multi-point light spot corresponding to the hologram pattern displayed on the spatial light modulator is formed on the information recording medium held on the stage through the imaging optical system, and the focal point of the imaging optical system.
- the structure of the information recording medium is changed by the multipoint light spot using at least a region where the intensity of the light spot used for recording is 80% or less of the intensity of the light spot on the optical axis.
- An information recording apparatus that records information collectively is generated.
- a stage that holds an information recording medium, a short pulse laser light source, a spatial light modulator that displays a hologram pattern that modulates laser light emitted from the short pulse laser light source, and a lens having the same focal length are lasers.
- a short pulse laser beam is modulated with a hologram pattern displayed on the spatial light modulator and irradiated to the information recording medium as a multi-point light spot, thereby causing a structural change in the information recording medium and collectively recording information.
- Non-Patent Document 2 In the field of optical processing, as disclosed in Non-Patent Document 2, etc., there is a technique for performing optical processing using a lens whose focal length is inversely proportional to the wavelength.
- Non-Patent Document 2 and the like are only related to processing technology using laser light, and there is no motivation to apply to the information recording field in which improvement in recording speed and recording quality should be compatible in the first place.
- Non-Patent Document 2 it is essential to use a diffractive lens whose imaging performance is inferior to that of a general refractive lens, and light control with high accuracy can be performed so as not to cause a recording error.
- the application to the required optical recording apparatus is inappropriate.
- the present invention it is possible to improve the information recording speed by correcting the intensity of the light spot away from the optical axis and increasing the amount of information that can be recorded by a single light irradiation.
- FIG. 6 illustrates an operation procedure of the recording apparatus.
- the schematic diagram which shows the Example of the information recording device by this invention Explanatory drawing which shows the extension of a pulse by chirp being introduce
- FIG. 3 is a schematic diagram showing an embodiment of an information recording apparatus used in the recording method of the present invention.
- This apparatus includes a recording optical system, an observation optical system, and a control device 101 that controls the entire apparatus.
- the short pulse laser 102 emits laser light 103.
- the short pulse laser 102 is a laser light source that emits laser light having a pulse width on the order of femtoseconds or picoseconds. Examples of the short pulse laser include a titanium sapphire laser, a fiber laser, and a picosecond solid-state laser.
- the shutter 104 controls the irradiation time of the laser beam 103.
- the attenuator 105 controls the intensity of the laser beam 103.
- the shutter 104 and the attenuator 105 may be incorporated in the short pulse laser 102 or may be installed outside the short pulse laser 102 as independent devices. Further, the beam diameter changing optical system 106 changes the beam diameter to an appropriate size at the time of incidence on the spatial light modulator 107 in consideration of the beam diameter of the laser light 103 and the area of the modulation element portion of the spatial light modulator 107. To do.
- the shutter 104, the attenuator 105, and the beam diameter changing optical system 106 are not necessarily arranged in this order, and their positions may be exchanged.
- the spatial light modulator 107 is a device that spatially changes the intensity and phase of the laser beam 103.
- the spatial light modulator 107 can be realized by arranging a plurality of liquid crystal elements in a lattice pattern and changing the alignment direction of the liquid crystal for each liquid crystal element. It is.
- the laser beam 103 is transmitted through the spatial light modulator 107 here, spatial light modulation may be performed by reflecting the laser beam 103 by the spatial light modulator 107.
- the laser beam 103 modulated by the spatial light modulator 107 is condensed in the recording medium 111 by the imaging optical system 108 and the objective lens 110.
- the dichroic mirror 109 reflects the laser beam 103 and transmits observation illumination light 114 described later.
- the imaging optical system 108 and the objective lens 110 are configured to generate a Fourier image of the laser beam 103 modulated by the hologram pattern displayed on the spatial light modulator 107 in the recording medium 111.
- a multipoint light spot corresponding to the hologram pattern displayed on the light modulator 106 is formed. Dots are collectively recorded on the surface or inside of the recording medium 111 by the formed multipoint light spot.
- An arbitrary light spot pattern can be formed in the recording medium 111 by changing the hologram pattern displayed on the spatial light modulator.
- An example of the recording medium 111 is a medium that is transparent to the laser beam 103, such as quartz glass.
- the stage 112 controls the position of the recording medium 111 using a piezo element, a stepping motor, or the like.
- the illumination light source 113 emits illumination light 114.
- the wavelength of the illumination light 114 is set to a value that transmits the dichroic mirror 109 and the recording medium 111.
- An LED, a lamp, or the like is used as the illumination light source.
- the illumination light 114 passes through the recording medium 111 and is imaged on the camera 116 by the objective lens 110 and the imaging lens 115.
- the recording medium 111 can be observed from the incident side of the laser beam 103 by the camera 116, and the vicinity of the condensing point of the laser beam 103 can be observed. Data of the camera 116 is transmitted to the control device 101.
- the control device 101 analyzes this data, calculates the size of the recorded bits, the signal intensity, etc., and feeds back to the short pulse laser 102, the attenuator 104, the spatial light modulator 107, etc. if necessary. If the recording optical system operates stably and there are few recording errors, it is not essential to provide an observation optical system. Further, the recording status may be monitored by installing an optical system having a different function for observing plasma emission generated during recording.
- the electric field of the laser beam 103 at the recording position becomes the Fourier transform of the electric field of the laser beam 103 at the position of the spatial light modulator 107, and is expressed by the following equation.
- E Rec the electric field of the laser beam 103 at the recording position
- E SLM is the electric field of the laser beam 103 in the spatial light modulator 107 position
- k x ⁇ k y each x direction during Fourier transform
- the y-direction Represents the spatial frequency.
- the relationship between the spatial frequency k x ⁇ k y and optical parameters are expressed by the following equation.
- ⁇ is the circular ratio
- ⁇ is the wavelength of light
- ⁇ is the magnification of the imaging optical system 108
- f is the focal length of the objective lens 110
- x ⁇ y is the coordinates of the recording position.
- the size of the light spot pattern is proportional to the wavelength ⁇ of the light. Since the short pulse laser beam 103 has a spectrum width that is inversely proportional to the pulse width, the size of the spot pattern corresponding to each wavelength component is different for each wavelength component as shown in FIG. Since the light spot patterns corresponding to the respective wavelength components overlap with each other around the optical axis, the deviation of the light spot pattern increases as the distance from the optical axis increases, resulting in an increase in the light spot size.
- the light spot shape when the wavelength of light is single is assumed to be Gaussian. It is assumed that the size of the light spot when the wavelength is single is sufficiently larger than the length of the center wavelength of the laser light 103, and the size of the spot does not depend on the wavelength of the light. By calculating and adding the spot size for each wavelength component under the above conditions, it is possible to calculate the actual size of the light spot.
- the actual size of the light spot is expressed by the following equation.
- r is the distance from the optical axis
- l (r) is the actual light spot size
- l 0 is the light spot size when the light wavelength is single
- ⁇ 0 is the laser beam 103 Represents the center angular frequency.
- ⁇ ss (r) represents the spectrum width at the spot center position of the light spot generated at a position r from the optical axis, and is represented by the following equation. Note that ⁇ s is the spectral width of the laser beam 103 displayed as an angular frequency.
- the intensity of the light spot is proportional to the above spectral width. Further, when each wavelength component is spatially dispersed, the pulse width ⁇ (r) of the laser beam 103 at a position r from the optical axis increases as shown in the following equation.
- FIG. 5 shows the influence of the increase in the light spot size on the recording speed.
- a in FIG. 5 shows the dependency of the recording error rate on the recording light power.
- the allowable light intensity fluctuation is about ⁇ 10%.
- B in FIG. 5 is a calculation of the intensity of the light spot under the conditions at the time of data acquisition of A using the above formula.
- the intensity of the light spot on the optical axis is 1. Since the allowable fluctuation range of the light intensity is about 20%, a recording error occurs in an area where the intensity of the light spot is 0.8 or less.
- the area that can be used for recording is limited to an area where the light spot intensity is 0.8 or more, and the upper limit number of bits that can be collectively recorded is limited. Since the recording speed is proportional to the number of batch recording bits, the recording speed is also limited by limiting the number of batch recording bits.
- the imaging optical system 108 is configured so that the imaging magnification is inversely proportional to the parameter relating to the wavelength, thereby solving the above problem.
- the wavelength parameter means the wavelength itself or a function having the wavelength as an argument.
- the size of the light spot pattern is proportional to the wavelength, but the imaging magnification is inversely proportional to the wavelength, so the two effects are canceled out, and all wavelengths are cancelled.
- the size of the light spot pattern for the component is kept constant.
- the imaging magnification is inversely proportional to the wavelength due to restrictions such as the wavelength, pulse width, and device size
- the above restrictions can be relaxed by adopting parameters other than the wavelength itself as a wavelength-related parameter.
- the parameter relating to the wavelength is a function of the refractive index n ( ⁇ ) of the glass.
- the imaging optical system 108 is configured by two lenses, but may be configured by three or more lenses. Glass having a large refractive index dispersion is used as a material constituting this lens, and chromatic aberration is intentionally introduced contrary to the normal correction of chromatic aberration.
- the magnification of the imaging optical system 108 is a function of the refractive index of the glass. The curved surface of each lens, the type of glass, the number of lenses, etc. are set appropriately, and the magnification of the imaging optical system 108 monotonously decreases with respect to the wavelength. By using the function, it is possible to suppress the decrease in the light spot intensity described above.
- Fig. 7 shows the operation procedure of the recording device.
- the data is divided into a plurality of pieces so that the recording quality is sufficiently high when the divided pieces of data are recorded (S11).
- the data is divided so that the length of all the light spots in the light spot pattern for recording the divided data is within 125% with respect to the length of the light spot on the optical axis. This is because, as described above, data recording fails when the light intensity of the light spot falls below 80%, so the length of the light spot needs to be 125% or less which is the reciprocal thereof.
- the divided data is sequentially recorded in the recording medium 111 by a plurality of times of recording. After the data division, the recording medium 111 is moved to the recording start position by the stage 112 (S12). Thereafter, based on the divided data, the control device 101 calculates a light modulation pattern to be displayed on the spatial light modulator 107 (S13). After completion of the calculation, the control device 101 controls the spatial light modulator 107 to display the calculated light modulation pattern (S14).
- the shutter 104 is opened by the control device 101, and data is recorded in the recording medium (S15). After the data recording is completed, the shutter 104 is closed (S16). Thereafter, the control device 101 determines whether there is still data to be recorded (S17), and if there is data, drives the stage 112 to move the recording medium to the next recording position (S18). After the movement is completed, calculation of the light modulation pattern corresponding to the data to be recorded next is started. The process from the calculation of the light modulation pattern to the stage movement is repeated until all data is recorded.
- FIG. 8 is a schematic diagram showing another embodiment of the information recording apparatus according to the present invention.
- symbol is attached
- the configuration until the laser light 103 is emitted from the short pulse laser 102 and the spatial light modulator 107 is irradiated with the laser light 103 is the same as that of the first embodiment.
- the difference from the first embodiment is that a part of the function of the imaging optical system 108 is realized as a phase pattern on the spatial light modulator 107.
- the remaining functions of the imaging optical system 108 are realized by the optical system 201.
- the function of preventing the expansion of the light spot described above is assigned to the spatial light modulator 107, and then the lens is arranged to realize the imaging function.
- the optical system 107 is not necessarily configured by a single lens, and may be configured by a plurality of lenses or other optical elements.
- the imaging optical system 108 can be simplified as compared with the form shown in the first embodiment.
- a phase Fresnel lens is an example of a pattern on the spatial light modulator that realizes a part of the function of the imaging optical system 108.
- a phase Fresnel lens is added to the spatial light modulator 107 as a phase Fresnel lens by adding a pattern constituting a phase Fresnel lens to the light modulation pattern displayed on the spatial light modulator 107 for forming a light spot. Can be added.
- the phase Fresnel lens pattern does not need to be changed according to the light modulation pattern used for data recording. When repeatedly recording, only the light modulation pattern representing the recording data is changed, and the same Fresnel lens pattern is added thereto. That's fine.
- the pattern constituting the Fresnel lens is a pattern in which a phase proportional to the square of the distance r from the optical axis is added to the laser beam 103.
- the focal length f is expressed by the following equation.
- a lens having a focal length inversely proportional to the wavelength is configured by the above pattern, and the magnification of the light spot pattern is also inversely proportional to the wavelength.
- FIG. 10 shows a comparison between the light spot pattern corrected by the configuration of this embodiment and the light spot pattern that has not been corrected.
- the ratio of the light intensity of the spot closest to the optical axis, that is, the spot having the maximum intensity and the spot farthest from the optical axis is 0.53 when correction is not performed, whereas when the correction is performed. Is 0.8. Therefore, when correction is not performed, the intensity of the light spot that deviates from the allowable change in light intensity is within the range allowed by the correction. That is, the number of bits that can be collectively recorded is improved, and the recording speed is improved accordingly.
- FIG. 11 is a schematic diagram showing another embodiment of the information recording apparatus according to the present invention.
- symbol is attached
- the configuration shown in FIG. 11 is the same as the configuration shown in FIG. 3 except that chirp correction is performed by the chirp correction mechanism 301 before the laser light 103 is applied to the spatial light modulator 107.
- the imaging optical system 108 In the configuration shown in FIG. 3, depending on the configuration of the imaging optical system 108, there is a case where a pulse extension due to chirp occurs.
- the imaging optical system 108 when the imaging optical system 108 is composed of a lens 302 whose focal length is inversely proportional to the wavelength and a normal lens 303, a difference occurs in the imaging position between the long wavelength component and the short wavelength component. As a result, chirp is added to the optical pulse, and the pulse width increases. For example, when a laser beam having a central wavelength of 800 nm and a spectral width of 10 nm is imaged with a lens whose focal length is 500 mm with respect to the central wavelength, the imaging position shift is 6 mm.
- the image formation position shift at the position of the recording medium 111 is 0.12 mm. This is 400 fs in time.
- the pulse width increases four times or more.
- the chirp correction mechanism 301 adds a chirp having the same size and the opposite sign as the chirp introduced by the imaging optical system 108 in advance. It was decided to suppress. As a result, even if the image forming position of the image forming optical system 108 is different for each wavelength, the pulse width can be kept constant and the recording quality can be kept constant.
- FIG. 14 is a schematic diagram showing the principle of another embodiment of light spot intensity correction according to the present invention.
- a part or all of the imaging optical system 108 is constituted by a lens array in which a plurality of lenses having the same focal length are arranged in a plane perpendicular to the optical axis of the laser light.
- Each lens constituting the lens array forms an image of only a part of the hologram pattern displayed on the spatial light modulator 107. That is, in FIG. 14, the hologram pattern in the region (1) is imaged by the lens (1), and the light spot (1) is formed in the recording medium 111. Hologram patterns with other numbers are also imaged by corresponding lenses, and corresponding light spot patterns are formed in the recording medium 111.
- Each lens forms an image only in a region where the light spot intensity used for recording is 80% or more compared to the light spot generated on the central axis of each lens.
- the hologram pattern is displayed on the spatial light modulator 107 by connecting those calculated for each lens position.
- the lens array is preferably made of glass from the viewpoint of laser light resistance.
- this invention is not limited to the above-mentioned Example, Various modifications are included.
- the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
- a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
- 101 Control device
- 102 Short pulse laser
- 103 Laser light
- 104 Shutter
- 105 Attenuator
- 106 Beam diameter changing optical system
- 107 Spatial light modulator
- 108 Imaging optical system
- 109 Dichroic mirror
- 110 objective lens
- 111 recording medium
- 112 stage
- 113 illumination light source
- 114 illumination light for observation
- 115 imaging lens
- 116 camera
- 201 optical system
- 301 chirp correction mechanism
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Abstract
Description
Claims (8)
- 情報記録媒体を保持するステージと、
短パルスレーザ光源と、
前記短パルスレーザ光源から出射したレーザ光を変調するホログラムパターンを表示する空間光変調器と、
焦点距離が波長に関するパラメータに反比例する結像光学系とを有し、
前記空間光変調器に表示されたホログラムパターンに応じた多点光スポットを前記結像光学系を通して前記ステージに保持された情報記録媒体に形成し、
前記結像光学系の焦点距離が波長に依存しない場合に記録に用いる光スポットの強度が光軸上の光スポットの強度に対して80%以下となる領域を少なくとも利用して前記多点光スポットにより前記情報記録媒体に構造変化を生じさせて情報を一括記録することを特徴とする情報記録装置。 - 請求項1記載の情報記録装置において、
前記結像光学系は前記空間光変調器と前記情報記録媒体との間に設けられたレンズによって構成される結像光学系であることを特徴とする情報記録装置。 - 請求項2記載の情報記録装置において、
前記レンズによって構成される結像光学系は複数枚のレンズによって構成されていることを特徴とする情報記録装置。 - 請求項1記載の情報記録装置において、
前記結像光学系の機能の一部が前記空間光変調器上に表示されたパターンによって実現されていることを特徴とする情報記録装置。 - 請求項1記載の情報記録装置において、
前記短パルスレーザ光源から出射されたレーザ光のチャープを補正するためのチャープ補正器が前記短パルスレーザ光源と前記空間光変調器の間に設けられていることを特徴とする情報記録装置。 - 情報記録媒体を保持するステージと、
短パルスレーザ光源と、
前記短パルスレーザ光源から出射したレーザ光を変調するホログラムパターンを表示する空間光変調器と、
同一の焦点距離を持つレンズが前記レーザ光の光軸に垂直な面内に複数枚配置されたレンズアレイとを有し、
前記レンズアレイの各レンズは前記空間光変調器の当該レンズに対応する領域に表示されたホログラムパターンに応じた多点光スポットを前記ステージに保持された情報記録媒体の当該レンズに対応する領域に形成し、前記レンズアレイにより形成される多点光スポットにより前記情報記録媒体に構造変化を生じさせて情報を一括記録することを特徴とする情報記録装置。 - 請求項6記載の情報記録装置において、
前記レンズアレイの各レンズは、記録に用いる光スポット強度が各々のレンズの中心軸上に生成される光スポットの強度の80%以上となる領域のみを結像することを特徴とする情報記録装置。 - 短パルスレーザ光を、空間光変調器に表示されたホログラムパターンで変調して情報記録媒体に多点光スポットとして照射することによって前記情報記録媒体に構造変化を生じさせて情報を一括記録する情報記録方法であって、
前記情報記録媒体に対する光照射位置を調整するステップと、
前記短パルスレーザ光を、焦点距離が波長に関するパラメータに反比例する結像光学系を介して、記録に用いる光スポットの長さが光軸上の光スポットの長さに対して125%以内となるようにして、前記情報記録媒体に多点光スポットを形成するステップと、
を有することを特徴とする情報記録方法。
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PCT/JP2014/050755 WO2015107669A1 (ja) | 2014-01-17 | 2014-01-17 | 情報記録装置及び情報記録方法 |
JP2015557648A JPWO2015107669A1 (ja) | 2014-01-17 | 2014-01-17 | 情報記録装置及び情報記録方法 |
US15/106,879 US9773521B2 (en) | 2014-01-17 | 2014-01-17 | Information recording device and information recording method |
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CN106644852A (zh) * | 2016-10-17 | 2017-05-10 | 哈尔滨工业大学 | 基于超短脉冲激光辐照同时获取球形颗粒光学常数与粒径分布的测量方法 |
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US10236027B1 (en) * | 2018-02-12 | 2019-03-19 | Microsoft Technology Licensing, Llc | Data storage using light of spatially modulated phase and polarization |
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JPWO2015107669A1 (ja) | 2017-03-23 |
US20160365107A1 (en) | 2016-12-15 |
US9773521B2 (en) | 2017-09-26 |
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