CN102214470B - Reading device - Google Patents
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- CN102214470B CN102214470B CN201010161295.2A CN201010161295A CN102214470B CN 102214470 B CN102214470 B CN 102214470B CN 201010161295 A CN201010161295 A CN 201010161295A CN 102214470 B CN102214470 B CN 102214470B
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- 238000001093 holography Methods 0.000 claims description 52
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- 230000003287 optical effect Effects 0.000 description 11
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Abstract
The invention discloses a reading device, comprising a spatial light modulator (SLM), a zoom lens, an objective lens, an image acquisition device and an adjusting module. The spatial light modulator is used for providing reading light; the zoom lens is configured in a light path of the reading light, so that the reading light forms a real image after passing through the zoom lens; the objective lens is used for focusing the real image on a coaxial holographic storage medium so as to generate a diffraction signal; the image acquisition device is used for acquiring the diffraction signal; and the adjusting module is used for adjusting an image enlargement ratio of the zoom lens according to the quality of the diffraction signal.
Description
Technical field
The invention relates to a kind of reading device, and particularly about a kind of reading device of coaxial holography image storage media.
Background technology
Hologram image storing technology is developed so far, and have passed through the research boom of the another ripple of a ripple in history.But although numerous researcher drops into countless painstaking effort, hologram image storing technology cannot be developed into all the time can commercial technology.
The characteristic of coaxial holography image stocking system is that reference light and flashlight are along same optical axis direction front transfer, and focus on via same object lens and disc carries out interference write, this system because of have configuration simple, can compatible with traditional optical Storage Media, reference light is shorter, lower for the requirement of laser people having the same aspiration and interest length with the optical path difference of flashlight, preferably displacement selectivity, preferably wavelength tolerance, preferably to tilt the characteristics such as tolerance, high storage capacity and high transmission rates, is considered to one of important storing technology of the next generation.
But when disc produces thermal deformation, medium refraction index can change, and grating also can be out of shape, and makes diffracted signal die down, point spread function (Point Spread Function thereupon; PSF) also can be deteriorated.These problems up to this point all do not have effective solution.
Summary of the invention
The object of the present invention is to provide a kind of reading device of coaxial holography image storage media, it can overcome the problem that thermal deformation causes.
A kind of reading device according to an aspect of the present invention comprises spatial light modulator (Spatial LightModulator; SLM), varifocal mirror group (Zoom Lens), object lens, image capture unit and adjusting module.Spatial light modulator is in order to provide reading light.Varifocal mirror assembly is placed in the light path reading light, makes to read light by after varifocal mirror group, forms a real image.Object lens in order to real image is focused on coaxial holography image storage media, and then produce diffracted signal.Image capture unit is in order to capture diffracted signal.Adjusting module, in order to the quality according to diffracted signal, adjusts the image magnification of varifocal mirror group.
In order to the defocusing effect caused when overcoming refraction index changing, in the one or more embodiment of the present invention, above-mentioned reading device still comprises a mobile device.When reading, the removable coaxial holography image storage media of mobile device, makes the equivalent back focal plane of object lens still be positioned on the reflection horizon of coaxial holography image storage media.
In the one or more embodiment of the present invention, above-mentioned varifocal mirror group is first-class focal plane varifocal mirror group (Parfocal lens).
A kind of reading device according to a further aspect of the invention comprises spatial light modulator (Spatial LightModulator; SLM), varifocal mirror group (Zoom Lens), object lens, thermometer and controller.Spatial light modulator (Spatial Light Modulator; SLM) in order to provide reading light.Varifocal mirror group (Zoom Lens) is configured in the light path reading light, makes to read light by after varifocal mirror group, forms a real image.Object lens are in order to focus on coaxial holography image storage media by real image.Thermometer is in order to detect the temperature of coaxial holography image storage media.Controller, in order to the temperature according to coaxial holography image storage media, selects the image magnification of varifocal mirror group.
In order to the quality that optimization reads, above-mentioned reading device can comprise writing station, image capture unit and adjusting module.Servosignal, in order to before providing reading light, is first write the central authorities of coaxial holography image storage media by writing station.The diffracted signal that image capture unit produces in order to capture servosignal.Adjusting module, in order to the quality according to diffracted signal, adjusts the image magnification of varifocal mirror group.
Similarly, in order to the defocusing effect caused when overcoming refraction index changing, in the one or more embodiment of the present invention, above-mentioned reading device still comprises a mobile device.When reading, the removable coaxial holography image storage media of mobile device, makes the equivalent back focal plane of object lens still be positioned on the reflection horizon of coaxial holography image storage media.
A kind of reading device according to another aspect of the invention comprises radial phase modulator, object lens and image capture unit.Radial phase modulator, in order in the mode of phase invariant in radial direction, modulates the phase place reading light.This radial phase modulator comprises 0 phase modulating part and the π phase modulating part of multiple random alignment.Object lens in order to the reading light after modulation is focused to coaxial holography image storage media, and then produce diffracted signal.Image capture unit is in order to capture diffracted signal.
In the one or more embodiment of the present invention, radial phase modulator is a radial lens array.
In the one or more embodiment of the present invention, radial phase modulator is a Spatial Phase Modulator.In the one or more embodiment of the present invention, radial phase modulator is a phase place photomask.
Advantageous Effects of the present invention is: reading device of the present invention can prevent the medium refraction index when disc produces thermal deformation from can change the situation also can be thereupon out of shape with grating, thus can avoid diffracted signal being died down and point spread function (Point Spread Function; The problem that PSF) also can be deteriorated.
Accompanying drawing explanation
Fig. 1 illustrates the diagrammatic cross-section of coaxial holography image storage media in time writing according to an embodiment of the present invention.
Fig. 2 illustrates the equivalent model schematic diagram of penetration grating in time writing of Fig. 1.
Fig. 3 illustrates the equivalent model schematic diagram of penetration grating in time reading of Fig. 1.
Fig. 4 illustrates the equivalent model schematic diagram of reflective gratings in time writing of Fig. 1.
Fig. 5 illustrates the equivalent model schematic diagram of reflective gratings in time reading of Fig. 1.
Fig. 6 illustrates the schematic diagram of the reading device according to an embodiment of the present invention.
Fig. 7 illustrates the front elevation of spatial light modulator when writing servo signal of Fig. 6.
Fig. 8 a-Fig. 9 c illustrates the schematic diagram of the servosignal according to the multiple embodiment of the present invention.
Figure 10 illustrates the process flow diagram of the adjustment varifocal mirror group according to an embodiment of the present invention.
Figure 11 illustrates the process flow diagram of the adjustment varifocal mirror group according to another embodiment of the present invention.
Figure 12 illustrates the schematic diagram of the reading device according to another embodiment of the present invention.
Figure 13 illustrates the schematic diagram of the radial phase modulator according to Figure 12.
Figure 14 is the stereographic map of the radial phase modulator according to an embodiment of the present invention.
Embodiment
Disclose multiple embodiment of the present invention below with reference to accompanying drawing, as clearly stated, the details in many practices will be explained in the following description.But should be appreciated that, the details in these practices is not applied to limit the present invention.That is, in some embodiments of the present invention, the details in these practices is non-essential.In addition, for simplifying for the purpose of accompanying drawing, some known usual structures and element are illustrated in the mode simply illustrated in the accompanying drawings.
Fig. 1 illustrates the diagrammatic cross-section of coaxial holography image storage media 100 in time writing according to an embodiment of the present invention.As shown in the figure, the coaxial holography image storage media 100 of present embodiment comprises reflection horizon 110 and recording layer 120.Recording layer 120 is positioned on reflection horizon 110.
When writing, user is by spatial light modulator (Spatial Light Modulator; SLM) modulation signal light 200 and reference light 300, and focus on reflection horizon 110 through lens 400.Now, flashlight 200 can be interfered mutually with reference light 300, and interference fringe is recorded in recording layer 120.
As Fig. 1 illustrate, due to the effect in reflection horizon 110, by existence two kinds of gratings in recording layer 120, one is penetration grating 500, and another kind is then reflective gratings 600.Specifically, penetration grating 500 comprises the grating that incident flashlight 210 is set up with incident reference light 310, and the grating that reflected signal light 220 is set up with reflected reference light 320.On the other hand, reflective gratings 600 comprises the grating that incident flashlight 210 is set up with reflected reference light 320, and the grating that reflected signal light 220 is set up with incident reference light 310.These two kinds of gratings represent two kinds of distinct characteristics.
Fig. 2 illustrates the equivalent model schematic diagram of penetration grating 500 in time writing of Fig. 1.In time writing, flashlight 200 and reference light 300 that spatial light modulator produces are imaged in the front focal plane of lens 400 in the lump, and (Jiao of lens 400 is long f), flashlight 200 and reference light 300 will transmit along same optical axis, and focus on coaxial holography image storage media 100 via lens 400, make flashlight 200 and reference light 300 produce interference fringe, be recorded in coaxial holography image storage media 100.
Fig. 3 illustrates the equivalent model schematic diagram of penetration grating 500 in time reading of Fig. 1.In time reading, the reading light 350 that the optical field distribution that spatial light modulator produces is identical with reference light 300 is imaged in the front focal plane of lens 400, and (Jiao of lens 400 is long f), focuses on coaxial holography image storage media 100 after making to read light 350 scioptics 400.Read light 350 and will produce diffracted signal 250 by after coaxial holography image storage media 100, after these diffracted signal 250 scioptics 400, by the front focal plane that images in lens 400, (Jiao of lens 400 is long f), forms the optical field distribution identical with flashlight 200.User can utilize image capture unit to capture this diffracted signal 250, to read in coaxial holography image storage media 100 stored data (that is, the interference fringe that flashlight 200 and reference light 300 produce).
Fig. 4 illustrates the equivalent model schematic diagram of reflective gratings 600 in time writing of Fig. 1.In time writing, flashlight 200 and reference light 300 will inject coaxial holography image storage media 100 along same optical axis but oppositely, and produce interference fringe in coaxial holography image storage media 100.
Fig. 5 illustrates the equivalent model schematic diagram of reflective gratings 600 in time reading of Fig. 1.In time reading, reading light 350 identical with reference light 300 for optical field distribution can be imaged in the front focal plane of lens 400 by spatial light modulator, and (Jiao of lens 400 is long f), focuses on coaxial holography image storage media 100 after making to read light 350 scioptics 400.Read light 350 and will produce diffracted signal 250 by after coaxial holography image storage media 100, (Jiao of lens 400 is long f), forms the optical field distribution identical with flashlight 200 back through the front focal plane that will image in lens 400 after lens 400 for this diffracted signal 250.Similarly, user can utilize image capture unit to capture this diffracted signal 250, to read in coaxial holography image storage media 100 stored data (that is, the interference fringe that flashlight 200 and reference light 300 produce).
Although above-mentioned model seems feasible, the problem of thermal deformation slowly cannot achieve a solution.When coaxial holography image storage media 100 produces thermal deformation, medium refraction index can change, grating (comprising penetration grating 500 and reflective gratings 600) also can be out of shape thereupon, diffracted signal 250 is died down, point spread function (Point SpreadFunction; PSF) also can be deteriorated.
Although many R&D teams think that thermal deformation problem must solve by wavelengthtunable laser and thermal deformation resistant material, all effectively do not address this problem at present.In view of this, inventor, after hammer away, derives the paraxial approximate solution of coaxial holography image stocking system, and according to this derivation result, proposes the solution of thermal deformation problem.
The defocusing effect caused when supposing refraction index changing is compensated by displacement coaxial holography image storage media 100, (specifically, when writing and read, coaxial holography image storage media 100 will move along with refraction index changing, the equivalent back focal plane of lens 400 is still positioned on the reflection horizon 110 of coaxial holography image storage media 100), the paraxial approximate solution that inventor releases is shown below:
Wherein each parameter is defined as follows:
(1) after thermal deformation, the medium refraction index of recording layer 120 becomes M
ndoubly, the equivalent focal length of lens 400 becomes f/M
f, then M under near-axial condition
f=1/M
n;
(2) wavelength of light in the medium of recording layer 120 is made to be M
λλ, and the wavelength that light 350 is read in definition is M
pλ, then M
λ=M
p/ M
n.
(3) 1/M is made
x, 1/M
yand 1/M
zfor the caloric deformation rate of grating respectively on x, y, z three directions of write, if the grating before thermal deformation is distributed as G
0(u, v, Δ z), then grating distribution G (u, v, Δ z) after thermal deformation is G
0(M
xu, M
yv, M
zΔ z);
(4) λ represents wavelength;
(5) k represents wave number (wave number);
(6) f represents Jiao's length of lens 400;
(7) Δ z represents the distance of misalignment lens 400 back focal plane of coaxial holography image storage media 100;
(8) u and v is the side direction coordinate of coaxial holography image storage media 100;
(9) U
ifor before incoming wave that spatial light modulator produces;
(10) U
ffor U
ifu's formula conversion (Fourier transform);
(11) U
s, U
rwith U
prepresent the flashlight 200 on lens 400 front focal plane, reference light 300 and the optical field distribution reading light 350 respectively; And
(12) L is the twice of the thickness of coaxial holography image storage media 100.
Above paraxial approximate solution seems complicated, but states system physical characteristic very clearly, is described below:
(1)
the diffracted signal 250 of representative distortion.Diffracted signal 250 after distortion reduces at ξ direction Linear
doubly, in η direction, Linear reduces
doubly.
(2) by
known, at Gauss's imaging point (ξ, η)=(ξ
1, η
1) on, if allow
Then can go out flashlight U by diffraction
s.
Due to
And
Wherein, α
lfor the linear expansion coefficient of recording layer 120, α
nfor the refractive index variation with temperature amount of recording layer 120.
Therefore, if we obtain 1+ α when image magnification when reading can be allowed to be write
lΔ T doubly, then can meet
Therefore, inventor proposes a kind of technical scheme solving thermal deformation problem based on above discovery.
Fig. 6 illustrates the schematic diagram of the reading device according to an embodiment of the present invention.As shown in the figure, a kind of reading device comprises spatial light modulator (Spatial Light Modulator; SLM) 710, varifocal mirror group (ZoomLens) 720, object lens 730, image capture unit 740 and adjusting module 750.Spatial light modulator 710 is in order to provide reading light.Varifocal mirror group 720 is configured in the light path reading light, makes to read light by after varifocal mirror group 720, forms a real image.Object lens 730 in order to real image is focused on coaxial holography image storage media 100, and then produce diffracted signal.Image capture unit 740 is in order to capture diffracted signal.Adjusting module 750, in order to the quality according to diffracted signal, adjusts the image magnification of varifocal mirror group 720.
In order to the quality of the objective diffracted signal that correctly judges, in the one or more embodiment of the present invention, above-mentioned reading device also can comprise a writing station.Servosignal before providing reading light, first can be write the central authorities of coaxial holography image storage media 100 by this writing station.Thus, when reading, the diffracted signal that image capture unit 740 i.e. fechtable servosignal produces, adjusting module 750 then can adjust the image magnification of varifocal mirror group 720 according to this diffracted signal.
Above-mentioned writing station can be the spatial light modulator 710 of Fig. 6 in practice, and its detailed start has been stated clearly in Fig. 2, Fig. 4 and related text describe, and at this, it is no longer repeated.
Fig. 7 illustrates the front elevation of spatial light modulator 710 when writing servo signal 800 of Fig. 6.Because varifocal mirror group 720 is when zoom, diffracted signal can along with Scalable, and the diffracted signal displacement therefore the closer to signal page 712 edge is larger, and the diffracted signal of signal page 712 central authorities then can not the displacement along with zoom.In view of this, in the figure 7, servosignal 800 can be positioned at the central authorities of signal page 712.Thus, when follow-up adjustment, adjusting module 750 can adjust varifocal mirror group 720 according to the quality of the diffracted signal of signal page 712 central authorities, and can not be subject to the impact of diffracted signal Scalable.
Fig. 8 a-Fig. 9 c illustrates the schematic diagram of the servosignal 800 according to the multiple embodiment of the present invention.As shown in the figure, the pixel distribution of servosignal 800 of 2 × 2 can as shown in Fig. 8 a and Fig. 9 a.In addition, the diffracted signal in order to avoid periphery has influence on middle servosignal, and the periphery of the servosignal 800 of 4 × 4 can be complete dark, as shown in Fig. 8 b and Fig. 9 b.Or the pixel distribution of the servosignal 800 of 4 × 4 can as shown in Fig. 8 c and Fig. 9 c.Should be appreciated that, above-mentioned servosignal 800 is only illustration, and is not used to limit the present invention, and in other embodiment of the present invention, servosignal also can be the various rotations of above-mentioned servosignal, such as: 90 ° or 180 °.
Specifically, above-mentioned adjusting module 750 is when adjusting, the optimization problem (Optimization problem) that to can be considered with the quality of diffracted signal be value function (Cost Function), its optimized solution (OptimalSolution) is to allow the image magnification of diffracted signal maximize quality.Should be appreciated that, above-mentioned " quality of diffracted signal " can be the contrast of diffracted signal, signal to noise ratio (S/N ratio) or the two combination in any.
Figure 10 illustrates the process flow diagram of the adjustment varifocal mirror group 720 according to an embodiment of the present invention.In Fig. 10, adjusting module 750 can first allow the image magnification of varifocal mirror group 720 change toward the direction of amplifying, when the image magnification of varifocal mirror group 720 is 1.00 times, the contrast and/or the signal to noise ratio (S/N ratio) that obtain diffracted signal are a (0) (step 910), and the image magnification of varifocal mirror group 720 is when being 1.01 times, the contrast and/or the signal to noise ratio (S/N ratio) that obtain diffracted signal are a (1) (step 920), if c (1)=a (1)-a (0) >=0 (step 930), then continue the image magnification amplifying varifocal mirror group 720, such as: to 1.02 times, now obtain contrast and/or signal to noise ratio (S/N ratio) is a (2) (step 940).If c (2)=a (2)-a (1) < 0 (step 950), then 1.01 times is best image magnification (step 960).If c (2)=a (2)-a (1) >=0, then continue the image magnification amplifying varifocal mirror group 720, by that analogy, until c (i)=a (i)-a (i-1) < 0 (step 970).
On the other hand, if c (1)=a (1)-a (0) < 0 (step 930), the image magnification of varifocal mirror group 720 can change toward the direction reduced by adjusting module 750, continue to repeat abovementioned steps, best image magnification can be obtained.
Get back to Fig. 6, in order to accelerate the speed read, the reading device of present embodiment can comprise thermometer 770 and controller 780.When reading, thermometer 770 can detect the temperature of coaxial holography image storage media 100.Controller 780 according to the temperature of coaxial holography image storage media 100, can select the image magnification of varifocal mirror group 720.In the present embodiment, the image magnification of varifocal mirror group 720 can tentatively be decided to be by controller 780:
Ω＝1+α
LΔT
Wherein, the image magnification of Ω selected by controller 780, α
lfor the linear expansion coefficient of coaxial holography image storage media 100, Δ T is the temperature difference of coaxial holography image storage media 100 in time reading and write.
Then, adjusting module 750 can according to the quality of diffracted signal, the image magnification of adjustment varifocal mirror group 720.Figure 11 illustrates the process flow diagram of the adjustment varifocal mirror group 720 according to another embodiment of the present invention.The difference of Figure 11 and Figure 10 is: in Fig. 10, and the initial value of the image magnification of varifocal mirror group 720 is 1.00 times.In fig. 11, the initial value of the image magnification of varifocal mirror group 720 is Ω times.All the other each steps are all identical, this it is no longer repeated it.
Should be appreciated that, controller 780 and adjusting module 750, except can existing, also can determine separately individually the image magnification of varifocal mirror group 720 simultaneously.For example, in the one or more embodiment of the present invention, controller 780 can directly using Ω doubly as the image magnification of varifocal mirror group 720, and do not need to carry out optimization process (Optimize) through adjusting module 750 again.
In order to the defocusing effect caused when overcoming refraction index changing, in the one or more embodiment of the present invention, above-mentioned reading device still comprises a mobile device 760.When reading, the removable coaxial holography image storage media 100 of mobile device 760, makes the equivalent back focal plane of object lens 730 still be positioned on the reflection horizon 110 of coaxial holography image storage media 100.Above-mentioned mobile device 760 can be linear slide rail, lead screw or other various travel mechanism.
In order to the fixing front focal plane of varifocal mirror group 720 and the position of back focal plane, in the one or more embodiment of the present invention, varifocal mirror group 720 can be first-class focal plane varifocal mirror group (Parfocal lens).Thus, when varifocal mirror group 720 zoom, the front focal plane of varifocal mirror group 720 and the position of back focal plane are when remaining unchanged.
In addition, reading device also can in the mode of phase invariant in radial direction, and the phase place of light is read in modulation one, and make to read light anyway Scalable, its optical field distribution is all identical with reference light when writing.That is, read light anyway Scalable, all satisfied
below for Figure 12, this technology contents will be illustrated.
Figure 12 illustrates the schematic diagram of the reading device according to another embodiment of the present invention.As shown in the figure, a kind of reading device comprises radial phase modulator 725, object lens 730 and image capture unit 740.Radial phase modulator 725, in order in the mode of phase invariant in radial direction, modulates the phase place reading light.Object lens 730 in order to the reading light after modulation is focused to coaxial holography image storage media 100, and then produce diffracted signal.Image capture unit 740 is in order to capture diffracted signal.
Figure 13 illustrates the schematic diagram of the radial phase modulator 725 according to Figure 12.As shown in the figure, in order to produce more uniform light distribution, the radial phase modulator 725 of present embodiment comprises 0 phase modulating part 724 (not adding site person) of multiple random alignment and π phase modulating part 726 (adding site person).0 above-mentioned phase modulating part 724 can be 120 with the sum of π phase modulating part 726, every 13 is a cycle, sequentially can be: 0 phase modulating part 724,0 phase modulating part 724, π phase modulating part 726, π phase modulating part 726,0 phase modulating part 724, π phase modulating part 726,0 phase modulating part 724, π phase modulating part 726,0 phase modulating part 724, π phase modulating part 726,0 phase modulating part 724, π phase modulating part 726, π phase modulating part 726.
In the one or more embodiment of the present invention, above-mentioned radial phase modulator 725 can be a radial lens array (as Figure 14 illustrate), this radial lens array has 120 lens pillars, and the focal length of each lens pillar can be 1.8mm.In addition, in other embodiment of the present invention, radial phase modulator also can pass through Spatial Phase Modulator or phase place photomask realizes.
Similarly, in order to the defocusing effect caused when overcoming refraction index changing, in one or more embodiment of the present invention, above-mentioned reading device still comprises a mobile device 760.When reading, the removable coaxial holography image storage media 100 of mobile device 760, makes the equivalent back focal plane of object lens 730 still be positioned on the reflection horizon 110 of coaxial holography image storage media 100.Above-mentioned mobile device 760 can be linear slide rail, lead screw or other various travel mechanism.
Although the present invention discloses as above with embodiment; but itself and be not used to limit the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention; when doing various equivalent change or replacement, therefore protection scope of the present invention is when being as the criterion of defining depending on accompanying the application's right.
Claims (3)
1. a reading device, comprises: a spatial light modulator, in order to provide a reading light; One varifocal mirror group, is configured in the light path of this reading light, makes this reading light by after this varifocal mirror group, forms a real image; One object lens, in order to focus on a coaxial holography image storage media by this real image; One thermometer, in order to detect the temperature of this coaxial holography image storage media; And a controller, in order to the temperature according to this coaxial holography image storage media, select the image magnification of this varifocal mirror group, wherein this image magnification of this varifocal mirror group is decided to be Ω=1+ α by this controller
l△ T, wherein, Ω is this image magnification, α
lfor the linear expansion coefficient of this coaxial full figure Storage Media, △ T is the temperature difference of this coaxial holography image storage media in time reading and write.
2. reading device according to claim 1, is characterized in that, also comprises: a writing station, in order to before providing this reading light, first a servosignal is write the central authorities of this coaxial holography image storage media; One image capture unit, in order to capture the diffracted signal that this servosignal produces; And an adjusting module, in order to the quality according to this diffracted signal, adjust the image magnification of this varifocal mirror group.
3. reading device according to claim 1, is characterized in that, also comprises: a mobile device, in order to this coaxial holography image storage media mobile, the equivalent back focal plane of these object lens is positioned on the reflection horizon of this coaxial holography image storage media.
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| CN101409079A (en) * | 2007-10-11 | 2009-04-15 | 汤姆森特许公司 | Lens system for common aperture holographic storage system |
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| KR20080062360A (en) * | 2006-12-29 | 2008-07-03 | 엘지전자 주식회사 | Hologram recording apparatus and method |
| JP2009223939A (en) * | 2008-03-14 | 2009-10-01 | Fuji Xerox Co Ltd | Optical reproducing device and optical reproducing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330363A (en) * | 2000-06-20 | 2002-01-09 | 严琼 | Optical pick-up device and method |
| CN1992020A (en) * | 2005-12-28 | 2007-07-04 | 株式会社日立制作所 | Optical disc apparatus and laser power control method |
| CN101409079A (en) * | 2007-10-11 | 2009-04-15 | 汤姆森特许公司 | Lens system for common aperture holographic storage system |
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