CN102214468A - Coaxial holography storage device and method thereof - Google Patents
Coaxial holography storage device and method thereof Download PDFInfo
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- CN102214468A CN102214468A CN2010101611593A CN201010161159A CN102214468A CN 102214468 A CN102214468 A CN 102214468A CN 2010101611593 A CN2010101611593 A CN 2010101611593A CN 201010161159 A CN201010161159 A CN 201010161159A CN 102214468 A CN102214468 A CN 102214468A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001093 holography Methods 0.000 title abstract 5
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 10
- 230000035515 penetration Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The invention relates to a coaxial holography storage device and a method thereof. By using the coaxial holography storage method, the temperature of coaxial holography storage media can be controlled, thus the temperature of the coaxial holography storage media in writing in is higher than that in reading by about 5 DEG C- 50 DEG C.
Description
Technical field
The invention relates to a kind of storage device, and particularly relevant for a kind of in-line holographic photograph (CollinearHolographic) storage device and method thereof.
Background technology
The development of holograph storing technology has been passed through the research boom of the another ripple of a ripple so far in history.Yet though numerous researcher drops into countless painstaking effort, the holograph storing technology can't be developed into all the time can commercial technology.
The characteristic of in-line holographic photograph stocking system is that reference light and flashlight are along same optical axis direction front transfer, and interfere on disc by same object lens focusing and to write, this system because of have configuration simple, can be short with the optical path difference of traditional optical Storage Media compatibility, reference light and flashlight, for lower, the preferable displacement selectivity of the requirement of laser people having the same aspiration and interest length, preferable wavelength tolerance, preferable characteristics such as inclination tolerance, high storage capacity and high transmission rates, be considered to one of important storing technology of the next generation.
Summary of the invention
The object of the present invention is to provide a kind of in-line holographic photograph storage device and in-line holographic photograph storage method, it can overcome the negative effect that reflective gratings causes.
A kind of in-line holographic photograph storage method is provided according to an aspect of the present invention, comprise the following step and (should be appreciated that wherein mentioned step is except that chatting bright its order person especially, all can adjust its front and back order, even can carry out simultaneously simultaneously or partly according to actual needs):
(1) data is write in the in-line holographic photograph Storage Media; And
(2) writing fashionablely, in-line holographic is taken a picture the temperature increase of Storage Media to predetermined temperature, this predetermined temperature is high about 5 ℃～50 ℃ than normal temperature.
A kind of in-line holographic photograph storage method is provided according to a further aspect of the invention, comprise the following step and (should be appreciated that wherein mentioned step is except that chatting bright its order person especially, all can adjust its front and back order, even can carry out simultaneously simultaneously or partly according to actual needs):
(1) data is write in the in-line holographic photograph Storage Media;
(2) data are read out in in-line holographic photograph Storage Media; And
(3) temperature of control in-line holographic photograph Storage Media makes high about 5 ℃～50 ℃ of the temperature of in-line holographic photograph Storage Media when writing fashionable temperature and read.
Provide a kind of in-line holographic photograph storage device according to another aspect of the invention, comprise writing station and heating device.In use, writing station can write data in the in-line holographic photograph Storage Media.Heating device then can write fashionablely, and in-line holographic is taken a picture the temperature increase of Storage Media to predetermined temperature, and this predetermined temperature is high about 5 ℃～50 ℃ than normal temperature.
A kind of in-line holographic photograph storage device is provided according to a further aspect of the present invention, comprises writing station, reading device and attemperating unit.In use, writing station can write data in the in-line holographic photograph Storage Media.Reading device can read out data in in-line holographic photograph Storage Media.Attemperating unit is the temperature of may command in-line holographic photograph Storage Media then, makes high about 5 ℃～50 ℃ of the temperature of in-line holographic photograph Storage Media when writing fashionable temperature and read.
Description of drawings
Fig. 1 illustrates in-line holographic photograph Storage Media according to an embodiment of the present invention in writing fashionable diagrammatic cross-section.
Fig. 2 illustrates the penetration grating of Fig. 1 in writing fashionable equivalent model synoptic diagram.
Fig. 3 illustrates the equivalent model synoptic diagram of penetration grating when reading of Fig. 1.
Fig. 4 illustrates the reflective gratings of Fig. 1 in writing fashionable equivalent model synoptic diagram.
Fig. 5 illustrates the equivalent model synoptic diagram of reflective gratings when reading of Fig. 1.
Fig. 6 illustrates the functional block diagram according to the in-line holographic photograph storage device of an embodiment of the present invention.
Fig. 7 illustrates employed in an embodiment of the present invention reference light.
Fig. 8 illustrates in an embodiment of the present invention, and the diffracted signal intensity that reflective gratings produced is with variation of temperature.
Embodiment
Disclose a plurality of embodiment of the present invention below with reference to accompanying drawing, as clearly stated, the details on many practices will be explained in the following description.Yet, should be appreciated that the details on these practices is not used with restriction the present invention.That is to say that in part embodiment of the present invention, the details on these practices is inessential.In addition, for the purpose of simplifying accompanying drawing, some existing habitual structure and elements will be illustrated in the mode of simple signal in the accompanying drawings.
Fig. 1 illustrates in-line holographic photograph Storage Media 100 according to an embodiment of the present invention in writing fashionable diagrammatic cross-section.As shown in the figure, the in-line holographic photograph Storage Media 100 of present embodiment comprises reflection horizon 110 and recording layer 120.Recording layer 120 is positioned on the reflection horizon 110.
Writing fashionablely, the user can pass through spatial light modulator (Spatial Light Modulator; SLM) modulation signal light 200 and reference light 300, and see through lens 400 and focus on the reflection horizon 110.At this moment, flashlight 200 can be interfered mutually with reference light 300, and interference fringe is recorded in the recording layer 120.
Illustrate as Fig. 1, because will there be two kinds of gratings in the effect in reflection horizon 110 in the recording layer 120, a kind of is penetration grating 500, and another kind then is a reflective gratings 600.Particularly, penetration grating 500 comprises the grating that incident flashlight 210 and incident reference light 310 are set up, and the grating set up of reflected signal light 220 and reflection reference light 320.On the other hand, 600 of reflective gratings comprise the grating that incident flashlight 210 and reflection reference light 320 are set up, and the grating set up of reflected signal light 220 and incident reference light 310.These two kinds of gratings represent two kinds of distinct characteristics.
Fig. 2 illustrates the penetration grating 500 of Fig. 1 in writing fashionable equivalent model synoptic diagram.Fashionable in writing, flashlight 200 and the reference light 300 that spatial light modulator produced imaged in the front focal plane (the long f of Jiao of lens 400) of lens 400 in the lump, flashlight 200 will be along same optical axis transmission with reference light 300, and scioptics 400 focus on in-line holographic photograph Storage Media 100, make flashlight 200 and reference light 300 produce interference fringe, be recorded in the in-line holographic photograph Storage Media 100.
Fig. 3 illustrates the equivalent model synoptic diagram of penetration grating 500 when reading of Fig. 1.When reading, the optical field distribution that spatial light modulator produced and reference light 300 are identical reads the front focal plane (the long f of Jiao of lens 400) that light 350 is imaged in lens 400, makes to focus on in-line holographic photograph Storage Media 100 after reading light 350 scioptics 400.Read light 350 and will produce diffracted signal 250 after by in-line holographic photograph Storage Media 100, will image in the front focal plane (the long f of Jiao of lens 400) of lens 400 behind these diffracted signal 250 scioptics 400, form the optical field distribution identical with flashlight 200.The user can utilize image capture unit to capture this diffracted signal 250, to read data stored in the in-line holographic photograph Storage Media 100 (that is, the interference fringe that flashlight 200 and reference light 300 are produced).
Fig. 4 illustrates the reflective gratings 600 of Fig. 1 in writing fashionable equivalent model synoptic diagram.Fashionable in writing, flashlight 200 and reference light 300 will be along same optical axises but are oppositely injected in-line holographic photograph Storage Media 100, and produce interference fringe in in-line holographic photograph Storage Media 100.
Fig. 5 illustrates the equivalent model synoptic diagram of reflective gratings 600 when reading of Fig. 1.When reading, spatial light modulator can with optical field distribution and reference light 300 identical read the front focal plane (the long f of Jiao of lens 400) that light 350 images in lens 400, make to focus on in-line holographic photograph Storage Media 100 after reading light 350 scioptics 400.Read light 350 and will produce diffracted signal 250 after by in-line holographic photograph Storage Media 100, will image in the front focal plane (the long f of Jiao of lens 400) of lens 400 behind these diffracted signal 250 reverse scioptics 400, form the optical field distribution identical with flashlight 200.Similarly, the user can utilize image capture unit to capture this diffracted signal 250, to read data stored in the in-line holographic photograph Storage Media 100 (that is, the interference fringe that flashlight 200 and reference light 300 are produced).
When penetration grating 500 and reflective gratings 600 exist simultaneously, penetration grating 500 will produce constructive or destruction interference with the diffracted signal 250 that reflective gratings 600 is produced, and this will cause diffracted signal 250 along with reading the temperature variation concuss even dropping near 0.Therefore, if can eliminate reflective gratings 600, will help to promote the temperature tolerance and the system stability of in-line holographic photograph stocking system.
In view of this, the inventor is behind hammer away, derive the paraxial approximate solution of in-line holographic photograph stocking system, and according to this derivation result, think that the in-line holographic photograph Storage Media 100 that has its source in of reflective gratings 600 problems is being write temperature difference fashionable and when reading.Therefore, below narration will propose to eliminate the technical scheme of reflective gratings 600 based on this derivation result.
The defocusing effect that is caused when supposing refraction index changing compensates by displacement in-line holographic photograph Storage Media 100, (particularly, when writing and read, in-line holographic photograph Storage Media 100 will move along with refraction index changing, make the equivalent back focal plane of lens 400 still be positioned on the reflection horizon 110 of in-line holographic photograph Storage Media 100), the paraxial approximate solution that the present application people released is shown below:
Wherein each parameter is defined as follows:
(1) refractive index of the medium of recording layer 120 becomes M after the thermal deformation
nDoubly, the equivalent focal length of lens 400 becomes f/M
f, M under the then paraxial condition
f=1/M
n
(2) make that the wavelength of light in the medium of recording layer 120 is M
λλ, and the wavelength that light 350 is read in definition is M
pλ, then M
λ=M
p/ M
n
(3) make 1/M
x, 1/M
yAnd 1/M
zBe the grating that the writes caloric deformation rate on x, y, three directions of z respectively, the grating of establishing before the thermal deformation is distributed as G
0(u, v, Δ z), then the grating distribution G after the thermal deformation (u, v, Δ z) is G
0(M
xU, M
yV, M
zΔ z);
(4) λ represents wavelength;
(5) k represents wave number (wave number);
(6) it is long that f represents Jiao of lens 400;
(7) △ z represents the distance of misalignment lens 400 back focal planes of in-line holographic photograph Storage Media 100;
(8) u and v are the side direction coordinate of in-line holographic photograph Storage Media 100;
(9) U
iBefore the incoming wave that is produced on the spatial light modulator;
(10) U
fBe U
iFu's formula conversion (Fourier transform);
(11) U
s, U
rWith U
p Represent flashlight 200, reference light 300 and the optical field distribution that reads light 350 on lens 400 front focal planes respectively; And
(12) L is the twice of the thickness of in-line holographic photograph Storage Media 100.
It is complicated that above paraxial approximate solution seems, and but stating system physical characteristic very clearly, and division is as follows:
(1)
The diffracted signal 250 of representative distortion.Diffracted signal 250 after distortion linearity on the ξ direction is dwindled
Doubly, linearity is dwindled on the η direction
Doubly.
(2) two braces are arranged in the integration type, wherein first braces is represented the light field of the diffracted signal 250 that penetration grating 500 produced, and second braces represented the light field of the diffracted signal 250 that reflective gratings 600 produced.
(3) have a Sinc function in the light field of the diffracted signal 250 that produced of reflective gratings 600, there is a variable in this function
Because the thickness L/2 of in-line holographic photograph Storage Media 100 is much larger than wavelength X, therefore the existence of this item will allow reflective gratings 600 have extremely low thermal deformation tolerance, make the distortion of in-line holographic photograph Storage Media 100 slight heats the diffracted signal 250 that reflective gratings 600 is produced will be reduced to zero, the diffracted signal 250 that only remaining penetration grating 500 produces.
Therefore, this case inventor proposes a kind of method that reduces the diffracted signal 250 that reflective gratings 600 produced based on above discovery.
According to an embodiment of the present invention, a kind of in-line holographic photograph storage method comprises the following step and (should be appreciated that mentioned in the present embodiment step is except that chatting bright its order person especially, all can adjust its front and back order, even can carry out simultaneously simultaneously or partly according to actual needs):
(1) data is write in the in-line holographic photograph Storage Media 100;
(2) data are read out in in-line holographic photograph Storage Media 100; And
(3) temperature of control in-line holographic photograph Storage Media 100 makes high about 5 ℃～50 ℃ of the temperature of in-line holographic photograph Storage Media when writing fashionable temperature and read.
That is to say that the user can painstakingly control in-line holographic photograph Storage Media 100 writing temperature difference fashionable and when reading, makes this temperature difference between about 5 ℃～50 ℃, to reduce the diffracted signal 250 that reflective gratings 600 is produced.
Because general user can read in-line holographic photograph Storage Media 100 mostly under the environment of normal temperature, therefore in one or more embodiment of the present invention, above-mentioned step (3) can be:
(3.1) writing fashionablely, in-line holographic is taken a picture the temperature increase of Storage Media 100 to predetermined temperature, this predetermined temperature is high about 5 ℃～50 ℃ than normal temperature.
Should be appreciated that above-described " normal temperature " speech should be interpreted as: " not painstakingly the heating or the cooling general temperature." if normal temperature is defined as 25 ℃, then above-mentioned predetermined temperature is about 30 ℃～75 ℃.On practice, the user can be set at predetermined temperature about 45 ℃～75 ℃.
In present embodiment and follow-up relevant narration, " pact " but in order to modifying the quantity of any slight variations, but this slight variations can't change its essence.For instance, " predetermined temperature is high about 5 ℃～50 ℃ than normal temperature ", this one describe except represent predetermined temperature really than normal temperature high 5 ℃～50 ℃, as long as can reduce the diffracted signal 250 that reflective gratings 600 is produced, temperature difference between predetermined temperature and the normal temperature also can be slightly less than 5 ℃, or is slightly larger than 50 ℃.
Another technology aspect of the present invention is for using the in-line holographic photograph storage device of above-mentioned in-line holographic photograph storage method.Graphic this technology contents that specifies of below will arranging in pairs or groups.
Fig. 6 illustrates the functional block diagram according to the in-line holographic photograph storage device of an embodiment of the present invention.As shown in the figure, a kind of in-line holographic photograph storage device comprises writing station 700, reading device 800 and attemperating unit 900.In use, writing station 700 is in order to write data in the in-line holographic photograph Storage Media 100.Reading device 800 is in order to read out data in in-line holographic photograph Storage Media 100.Attemperating unit 900 is in order to the temperature of control in-line holographic photograph Storage Media 100, makes high about 5 ℃～50 ℃ of the temperature of in-line holographic photograph Storage Media when writing fashionable temperature and read.
Above-mentioned writing station 700 comprises spatial light modulator 750 and lens 400.Writing fashionablely, spatial light modulator 750 can provide reference light and flashlight, and allows reference light and flashlight advance along same optical axis.Lens 400 can focus on in-line holographic photograph Storage Media 100 with reference light and flashlight, make reference light and flashlight interfere mutually, and a plurality of interference fringes are recorded in the in-line holographic photograph Storage Media 100.The detailed start of writing station 700 has been stated clearly in Fig. 2, Fig. 4 and related text narration thereof, no longer repeats to give unnecessary details at this.
Above-mentioned reading device 800 comprises spatial light modulator 750, lens 400 and image capture unit 850.When reading, spatial light modulator 750 can provide optical field distribution identical with reference light read light.Lens 400 can focus on in-line holographic photograph Storage Media 100 with reading light.Read light and will produce diffracted signal after by in-line holographic photograph Storage Media 100.The user can utilize image capture unit 850 to capture this diffracted signal, to read stored data in the in-line holographic photograph Storage Media 100.The detailed start of reading device 800 has been stated clearly in Fig. 3, Fig. 5 and related text narration thereof, no longer repeats to give unnecessary details at this.
Similarly, because general user can read in-line holographic photograph Storage Media 100 mostly under the environment of normal temperature, therefore in one or more embodiment of the present invention, above-mentioned attemperating unit 900 can be a heating device 950.This heating device 950 can write fashionablely, and in-line holographic is taken a picture the temperature increase of Storage Media 100 to high about 5 ℃～50 ℃ than normal temperature.
Should be appreciated that above-described attemperating unit 900 is an illustration only, is not in order to restriction the present invention.In another embodiment of the present invention, attemperating unit 900 can be a refrigeratory.This refrigeratory can be when reading, and the take a picture temperature of Storage Media of in-line holographic is reduced to than low about 5 ℃～50 ℃ of normal temperature.Perhaps, in other embodiment of the present invention, attemperating unit 900 also can be the combination of above-mentioned heating device 950 and refrigeratory.
Below will disclose a plurality of analog results of the present invention, the in-line holographic photograph storage device and the method thereof of the above-mentioned embodiment of the present invention will be described by this, have needed physical characteristics really.Should be appreciated that in the following description, the parameter of having mentioned in the above-described embodiment will no longer repeat to give unnecessary details, and only just need further not define the person and be replenished, close chat earlier bright.
In following simulation, flashlight is the pointolite on the initial point, wavelength is 408nm, Jiao of lens is long to be 4mm, the thickness of in-line holographic photograph Storage Media is 0.5mm, the refractive index of in-line holographic photograph Storage Media is 1.5, the length of side of each pixel is 13.68 μ m on the spatial light modulator, sum of all pixels on the spatial light modulator is 321 * 321, reference light does not carry out any modulation (as shown in Figure 7), the internal diameter of reference light and external diameter are respectively sky and ask 71.4% and 93.8% of photomodulator length, and the fill factor, curve factor of each pixel on the spatial light modulator (fill factor) is 100%.
According to after above parameter simulates, obtain the result that Fig. 8 illustrates, wherein Fig. 8 illustrates diffracted signal intensity that reflective gratings produces with variation of temperature.
Though the present invention discloses as above with embodiment; yet it is not in order to limit the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention; when can making various changes that are equal to or replacement, so protection scope of the present invention is when looking accompanying being as the criterion that the application's claim scope defined.
Claims (10)
1. an in-line holographic photograph storage method is characterized in that, comprises:
One data are write in the coaxial holograph Storage Media; And
Writing fashionablely, with temperature increase to a predetermined temperature of this in-line holographic photograph Storage Media, wherein this predetermined temperature is high about 5 ℃～50 ℃ than normal temperature.
2. the in-line holographic photograph storage method according to claim 1 is characterized in that this predetermined temperature is about 30 ℃～75 ℃.
3. the in-line holographic photograph storage method according to claim 1 is characterized in that this predetermined temperature is about 45 ℃～75 ℃.
4. an in-line holographic photograph storage method is characterized in that, comprises:
One data are write in the coaxial holograph Storage Media;
These data are read out in this in-line holographic photograph Storage Media; And
Control the temperature of this in-line holographic photograph Storage Media, make high about 5 ℃～50 ℃ of the temperature of this in-line holographic photograph Storage Media when writing fashionable temperature and read.
5. the in-line holographic photograph storage method according to claim 4 is characterized in that the temperature of controlling this in-line holographic photograph Storage Media comprises:
Write fashionable, with the temperature increase of this in-line holographic photograph Storage Media to about 30 ℃～75 ℃.
6. the in-line holographic photograph storage method according to claim 4 is characterized in that the temperature of controlling this in-line holographic photograph Storage Media comprises:
Write fashionable, with the temperature increase of this in-line holographic photograph Storage Media to about 45 ℃～75 ℃.
7. an in-line holographic photograph storage device is characterized in that, comprises:
One writing station is in order to write data in the one coaxial holograph Storage Media; And
One heating device, in order to write fashionablely, with temperature increase to a predetermined temperature of this in-line holographic photograph Storage Media, wherein this predetermined temperature is high about 5 ℃～50 ℃ than normal temperature.
8. the in-line holographic photograph storage device according to claim 7 is characterized in that this writing station comprises:
One spatial light modulator in order to a reference light and a flashlight to be provided, and makes this reference light and this flashlight advance along same optical axis; And
One lens in order to this reference light and this flashlight are focused on this in-line holographic photograph Storage Media, make this reference light and this flashlight interfere mutually, and a plurality of interference fringes are recorded in this in-line holographic photograph Storage Media.
9. an in-line holographic photograph storage device is characterized in that, comprises:
One writing station is in order to write data in the one coaxial holograph Storage Media;
One reading device is in order to read out these data in this in-line holographic photograph Storage Media; And
One attemperating unit in order to control the temperature of this in-line holographic photograph Storage Media, makes high about 5 ℃～50 ℃ of the temperature of this in-line holographic photograph Storage Media when writing fashionable temperature and read.
10. the in-line holographic photograph storage device according to claim 9 is characterized in that this writing station comprises:
One spatial light modulator in order to a reference light and a flashlight to be provided, and makes this reference light and this flashlight advance along same optical axis; And
One lens in order to this reference light and this flashlight are focused on this in-line holographic photograph Storage Media, make this reference light and this flashlight interfere mutually, and a plurality of interference fringes are recorded in this in-line holographic photograph Storage Media.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109557028A (en) * | 2018-12-09 | 2019-04-02 | 山西大学 | A kind of multi-pass pond with intensive spot pattern |
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| CN2739623Y (en) * | 2004-10-13 | 2005-11-09 | 中国科学院上海光学精密机械研究所 | Coaxial-like holographic atomic beam phase contrast imaging device |
| JP2007257800A (en) * | 2006-03-24 | 2007-10-04 | Fujifilm Corp | Optical recording method and optical reproduction method, and optical recorder and optical reproducer |
| US20080088896A1 (en) * | 2006-10-11 | 2008-04-17 | Sony Corporation | Hologram recording apparatus, hologram recording medium and hologram recording method |
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2010
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| CN2590044Y (en) * | 2002-12-27 | 2003-12-03 | 中国科学院上海光学精密机械研究所 | Recording device of high magnifying ratio X-ray photoelectron coaxial hologram |
| CN2739623Y (en) * | 2004-10-13 | 2005-11-09 | 中国科学院上海光学精密机械研究所 | Coaxial-like holographic atomic beam phase contrast imaging device |
| JP2007257800A (en) * | 2006-03-24 | 2007-10-04 | Fujifilm Corp | Optical recording method and optical reproduction method, and optical recorder and optical reproducer |
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