CN1255785C - A non-volatile holographic data storage method - Google Patents
A non-volatile holographic data storage method Download PDFInfo
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- CN1255785C CN1255785C CN 200410037662 CN200410037662A CN1255785C CN 1255785 C CN1255785 C CN 1255785C CN 200410037662 CN200410037662 CN 200410037662 CN 200410037662 A CN200410037662 A CN 200410037662A CN 1255785 C CN1255785 C CN 1255785C
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000013500 data storage Methods 0.000 title claims abstract description 18
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- 238000010521 absorption reaction Methods 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 12
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- 238000006243 chemical reaction Methods 0.000 claims description 3
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- 230000005540 biological transmission Effects 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 3
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 3
- 206010070834 Sensitisation Diseases 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000008313 sensitization Effects 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007334 memory performance Effects 0.000 description 1
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Abstract
The present invention belongs to the technical fields of optical information storage and volume holographic data storage, which relates to a non-volatile volume holographic data storage method. A photochromic material is used as a volume holographic recording medium, the double photon recording, the single photon reading and the ultraviolet light erasing are used for realizing the rapid recording of data information, and the present invention has non-volatile reading and repeated erasing and writing. The present invention increases the density of the volume holographic storage of the photochromic material, and can be used in the field of volume holographic data storage based on the high density, the rapid recording, the repeated erasing and writing and the non-volatile reading of the photochromic material.
Description
Technical field
The invention belongs to optical information storage and body holographic data storage technical field, particularly in the photochromic material, realize the method for body holographic data storage.Can be applicable to high density, fast recording, can repeatedly repeat erasable, non-volatile body holographic data storage of reading.
Background technology
Informationization is the inexorable trend of current world economy development.Along with the arrival of information age, people grow with each passing day for the requirement of information stores, transmission and processing.The optical information memory technology becomes emerging memory technology after the magnetic storage technology with characteristics such as its density height, life-span are long, becomes the object that countries in the world are competitively studied.Advantage such as fast and relevant addressed function becomes the optical storage technology of current tool potentiality to the optical volume holographic memory technology with its redundance height, data parallel transmission, storage density height, addressing speed.And can repeat the research focus that erasable, non-volatile body holographic storage technology of reading is still this field.
The photochromic material is under the different wave length effect, the variation of refractive index and absorptivity takes place to transform mutually and be accompanied by in its open loop closed loop state, this is used to realize erasable body holographic memory, and Tsing-Hua University Liu state waits the people to report with two fragrant alkene (photochromic material) medium of noting down at Chinese physics wall bulletin the 20th volume 1051-1053 page or leaf to carry out the body holographic data storage.Fig. 1 is the main light channel structure figure of this storage system, its system mainly comprises LASER Light Source 11, be successively set on the pinhole filter 12 on this light source emitting light path, collimation lens 131, block the light diaphragm 14 and first catoptron 151, be successively set on first half-wave plate 161 on the reflected light path of first catoptron, polarization splitting prism 17, second half-wave plate 162 on these polarization splitting prism 17 transmitted light paths, the first group of shutter 181 and second catoptron 152, be arranged on the spatial light modulator 19 on the reflected light path of second catoptron 152, fourier transform lens 132, recording medium 100, inverse fourier transform lens 134, second group of shutter 182 and detector C CD200, be arranged on the 3rd catoptron 153 on these polarization splitting prism 17 reflected light paths, recording medium 100 is positioned on the 3rd mirror reflects light path simultaneously.
The storage means of this storage system is: during record, the wavelength that LASER Light Source 11 produces is that the laser of 514.5nm is after pinhole filter and collimation lens expand bundle, collimation, after first catoptron 151, first half-wave plate 161 are adjusted polarization state, impinge perpendicularly on polarization splitting prism 17, incident light is divided into transmitted light and reflected light: its transmitted light, after second half-wave plate 162 is adjusted into the S polarization state, by spatial light modulator 19 modulation, constitute the required thing light of record, its luminous power is 0.5mW; Its reflected light through the 3rd catoptron 153, constitutes the required reference light of record, and its light intensity is 12mW/cm
2Spatial light modulator 19, fourier transform lens 132, recording medium 100, inverse fourier transform lens 134, detector C CD200 constitute typical 4F structure, realize reading of fourier spectra holographic recording and thing light.Reference light and thing light incide the recording medium 100 that places spectrum face position with angle 90 degree interferes the formation grating, writes down a data page; The process that reads is read light at corresponding record position reading corresponding data page information then with the blocking-up of thing light light path with reference light, when reading, regulates light intensity to the 110 μ W/cm that reads light
2
After adopting said method to read 2 hours continuously, the quality of reproduced image does not obviously descend.But this method is because there is linear absorption in material to record (reading) wavelength, this will produce two unfavorable factors: one, since recording materials in body grating be an amplitude phase-type mixing grating, its dynamic range is littler than pure phase-type grating dynamic range, and storage density will be big not as the latter's storage density; Two, recording materials can be wiped the data message of having deposited in the material to reading the linear absorption reaction of light wave.So after reading the longer time continuously, reproduced image can thicken gradually until last disappearance.This shows that the single photon holographic recording that adopts high light record, the low light level to read is can not really realize high density, fast recording, can repeatedly repeat erasable, non-volatile body holographic data storage of reading.
Zhao Jian in 2003 in Tsing-Hua University's master thesis " double doping lithium niobate crystal body holographic memory performance study ", use the lithium columbate crystal mix copper, the cerium medium of noting down to carry out non-volatile gonosome holographic data storage.Fig. 2 is the main light channel structure figure of this storage system, its system mainly comprises first LASER Light Source 211, first pinhole filter 221 that on the emitting light path of this first light source 211, sets gradually, first collimation lens 231, first blocks light diaphragm 241, first catoptron 251, first half-wave plate 261 that on the reflected light path of this first catoptron 251, is provided with and first polarization splitting prism 271, second half-wave plate 262 that on the transmitted light path of this polarization splitting prism 271, is provided with, the first group of shutter 281 and second catoptron 252, the spatial light modulator 29 that on the reflected light path of this second catoptron 252, is provided with, fourier transform lens 232 and body recording medium 300, and inverse fourier transform lens 234, second group of shutter 282, detector C CD200; Also comprise second LASER Light Source 212, second pinhole filter 222, the collimation lens 232, second that are arranged on the emitting light path of this second LASER Light Source 212 block light diaphragm 241 and the 3rd catoptron 253, second polarization splitting prism 272 is set on the reflected light path of the 3rd catoptron 253, and the 3rd catoptron 253 is set on the reflected light path of this second polarization splitting prism 272, on the reflected light path of another medium face perpendicular to the 3rd catoptron 253 of this recording medium 300.
The storage means of this system is: during record, the wavelength that first LASER Light Source 211 produces is that the laser of 632.8nm is after pinhole filter and collimation lens expand bundle, collimation, after first half-wave plate 261 is adjusted polarization state, impinge perpendicularly on first polarization splitting prism 271, incident light is divided into two-way: its transmitted light, be adjusted into the S polarization state through second half-wave plate 262, behind first group of shutter 281, second catoptron 252, modulate by spatial light modulator 29, constitute the required thing light of record, its light intensity is 50mW/cm
2Its reflected light through second polarization splitting prism 272, the 3rd catoptron 253, constitutes the required reference light of record, and its light intensity is 10mW/cm
2Simultaneously, the wavelength that second LASER Light Source 212 produces is that the laser of 488nm is after pinhole filter and collimation lens expand bundle, collimation, incide second polarization splitting prism 272, its reflected light through the 3rd catoptron 253, constitute the required sensitization light of record, its light intensity is 5mW/cm
2, its light path is identical with the reference light light path.Spatial light modulator 29, fourier transform lens 232, recording medium 300, inverse fourier transform lens 234, detector C CD200 constitute typical 4F structure.Reference light, sensitization light become an angle of 90 degrees to incide to place the recording medium 300 of spectrum face position to interfere with thing light respectively to form gratings, write down a data page.The process that reads is then closed second LASER Light Source 212, simultaneously with thing light light path blocking-up, use reference light consistent when writing down at corresponding record position reading corresponding data page information, after reading 5 hours continuously, picture quality does not obviously change, thereby has realized the photofixation of stored information.Though employing can realize to a certain extent that based on the double-colored body holographic memory of double doping lithium niobate crystal the non-volatile of data read, it exists, and dynamic range is little, sensitivity is low, can not realize shortcomings such as fast recording.
Summary of the invention:
Fundamental purpose of the present invention is for overcoming the weak point of prior art, a kind of method and system thereof of non-volatile gonosome holographic data storage are proposed, utilize the photochromic material when solid-state, to have stronger two-photon absorption effect reaches does not have linear absorption at infrared band characteristic, adopt the two-photon record, single photon is read fast recording, non-volatile the reading of realizing data.The present invention has improved the density of photochromic material bodies holographic memory, can be applicable to high density, fast recording based on the photochromic material, can repeatedly repeat erasable, non-volatile body holographic data storage field of reading.
The method of a kind of non-volatile gonosome holographic data storage that the present invention proposes, adopt the photochromic material as the body holographic recording medium, by the two-photon record, single photon is read and ultraviolet light is wiped and realized the data message fast recording, non-volatilely reads and repeatedly repeats erasable; May further comprise the steps:
1, two-photon body holographic data-recording process: at first, according to the absorption spectra characteristic of photochromic material, the pulsed laser that selection is complementary with it is as the light source of recording light, and this recording light wavelength is beyond the linear absorption zone of photochromic material; The light that this pulsed laser sends is divided into thing light and reference light two-beam, make holographic recording medium place thing light and reference light coherent field, secondly, regulate the light intensity of recording light, the light intensity of coherent field that makes thing light and reference light is greater than the intensity that makes recording medium generation two-photon absorption reaction, and less than the light intensity damage thresholding (avoiding causing the damage of recording materials) of this recording medium; At last, regulate the optical path difference of reference light and thing light, the optical path difference that makes two-beam is in the coherent length of pulsed laser;
2, monochromatic light daughter holographic data readout: select the low-power continuous wave laser identical as the light source of reading light with the recording light wavelength, the light path that light is read in adjusting makes it identical with described reference light light path, promptly realize data non-volatile reading (because it is identical with the recording light wavelength to read optical wavelength, thus can not produce owing to Prague mismatch cause the distortion of reproduced image; Because of material this wavelength is not had linear the absorption again, thereby light wiping only occur reading canned data information.So realized really that the non-volatile of data read).
The inventive method also can comprise the erase process of recorded information: adopt the ultraviolet source emergent light, make it aim at the zone that this recording medium will be wiped, just can wipe this position institute data information stored, thereby realized data message repeat erasable.
Principle of the present invention is to utilize the photochromic material to have stronger two-photon absorption effect reaches does not have linear absorption at infrared band characteristic when solid-state, adopts the two-photon record, and single photon is read fast recording, non-volatile the reading of realizing data.
Method provided by the invention adopts the two-photon absorption holographic recording of infrared wavelength, the two-photon absorption reaction only takes place in the coherent area movement of reference light and thing light, and the variations in refractive index of recording medium material is linear with the distribution of record light field, thereby realizes recording of information.Adopt low-power continuous wave laser realization the non-volatile of information of co-wavelength to read when reading.
Fig. 3 is the single photon and the two-photon absorption spectrogram of photochromic material, 31,32 are respectively single photon (linearity) absorption curve of material at open loop and closed loop state, and 33 is material is changed into open loop situations by the closed loop state two-photon (third-order non-linear) absorption curve.As can be seen from the figure, in the two-photon absorption wavelength region may, the molecule of the open loop of material and closed loop state does not all have linear the absorption, and the absorption peak wavelength of two-photon is about 2 times of closed loop state absorption peak wavelength, and promptly material can be λ by absorbing wavelength both
2A photon also simultaneously absorbing wavelength be λ
3Two photons realize of the transformation of closed loop state to open loop situations.The two-photon body holographic recording process of photochromic material is actually by material and is converted into open loop situations at a molecule of closed loop state by two photons of an intermediate virtual attitude absorption, thereby causes variations in refractive index to form the process of phase-type Bragg grating.The erase process of information is to be λ by wavelength
1Light make material change into all that the closed loop state realizes.
Carrying out two-photon body holographic recording need meet the following conditions: at first, the light intensity of pulse laser will be lower than the light intensity damage thresholding of recording medium, but wants to make material generation two-photon absorption effect; Secondly, the recording light wavelength will be beyond the linear absorption zone of material, so just can make recording medium that the two-photon absorption reaction on three rank only takes place, read Shi Buhui at single photon and read light wiping prestored message, general photochromic material in the linear absorption zone of closed loop state at 500-650nm, therefore, the two-photon absorption zone is generally 2 times of its linear absorption wavelength, promptly at the 1000-1300nm of region of ultra-red; At last, the light that pulsed laser sends is divided into two-beam, be reference light and thing light, optical path difference when they arrive material will so just can interfere in the coherent length of pulse laser, forms modulated Field, if establishing the individual pulse duration of pulsed laser is 100ps, then its coherent length is 30mm, and the optical path difference of reference light and thing light must could form interference field in 30mm.
Than before the light hologram memory system, advantage of the present invention is:
Two-photon body holographic recording process depends on light intensity, have only light intensity to reach certain thresholding, two-photon absorption could take place, thereby realize recording of information, the erasure effect that has produced when this has just overcome the low-power playback light information of carrying out that adopts identical wavelength and reads.
The wavelength that two-photon body holographic recording can be selected the photochromic material not to be produced linear absorption carries out record, and this wavelength is away from the absorption peak of photochromic material.Therefore, select the wavelength of infrared band to realize the information record and read,, can realize that the non-volatile of data read because this wavelength does not all have linear the absorption to the open loop closed loop state of material.
The two-photon body holographic recording time is very short, can realize fast recording, adopts the psec even the laser instrument of short pulse more, and the time of its two-photon reaction, also in psec even shorter time range, the recording of information time also was the time of two-photon reaction.Therefore can realize fast recording.
Description of drawings
Fig. 1 is existing single photon body hologram memory system structural drawing based on two fragrant alkene materials.
Fig. 2 is existing double-colored body hologram memory system structural drawing based on the double doping lithium niobate material.
Fig. 3 is the single photon and the two-photon absorption spectrogram of photochromic material.
Fig. 4 is the body holophotal system structural drawing of reading based on the two-photon record and the single photon of photochromic material of the present invention.
Embodiment
The method embodiment of a kind of non-volatile gonosome holographic data storage that the present invention proposes is described with reference to the accompanying drawings as follows:
The hologram memory system that the inventive method embodiment adopts a kind of two-photon record and single photon to read realizes, the main light channel structure of this system as shown in Figure 4, comprise first LASER Light Source 411, be successively set on first pinhole filter 421 on this LASER Light Source emitting light path, first collimation lens 431, first blocks the light diaphragm 441 and first catoptron 451, first half-wave plate 461, polarization splitting prism 47, by second half-wave plate 462 that is arranged on these polarization splitting prism 47 transmitted light paths, the first group of shutter 481 and second catoptron 452, spatial light modulator 49, fourier transform lens 433 constitutes thing light light path, by the phase compensation device 410 that is arranged on these polarization splitting prism 47 reflected light paths, the 4th catoptron 454 constitutes reference path; Reference light and thing light become an angle of 90 degrees to incide to place the body recording medium 400 of spectrum face position; Second LASER Light Source 412 is blocked light diaphragm 442, the 3rd group of shutter 483, half-reflection and half-transmission prism 40 (reflection), the 3rd catoptron 453, polarization splitting prism 47 (transmission), phase compensation device 410, the 4th catoptron 454 and is constituted and read light path by being successively set on second pinhole filter 422, second collimation lens 432, second on this second LASER Light Source emitting light path; Spatial light modulator 49, fourier transform lens 433, recording materials 400, inverse fourier transform lens 434 and detector C CD200 by coaxial setting constitute typical 4F structure; Also comprise the 3rd light source 413, be successively set on the 3rd pinhole filter 423, the 3rd collimation lens the 433, the 3rd on the 3rd light source emitting light path and block light diaphragm 443, half-reflection and half-transmission prism 40 (transmission), the 3rd catoptron 453, polarization splitting prism 47 (transmission), phase compensation device 410, the 4th catoptron 454 and constitute and wipe light path.
It is the pulsed laser of 1064nm that first laser instrument of said system adopts wavelength, and its pulse width is 50ps, and the optical power adjusting scope is 0.5GW-4GW; It is the continuous low power laser instrument of 1064nm that second laser instrument adopts wavelength, and the light intensity of its output is 100 μ W/cm
2, recording medium adopts the photochromic material with two-photon effect, and it is the ultraviolet source of 384nm that the 3rd light source adopts wavelength.
Other components and parts all adopt conventional products.
Utilize the method embodiment of the non-volatile gonosome holographic data storage that said system realizes, it is mainly by the two-photon record, and single photon is read and ultraviolet light is wiped and realized the data message fast recording, non-volatilely reads and repeatedly repeats erasable.May further comprise the steps (referring to Fig. 4):
1, two-photon body holographic data-recording process; Pulse width is that wavelength that the LASER Light Source 411 of 50ps produces is that the laser of 1064nm is after pinhole filter and collimation lens expand bundle, collimation, after half-wave plate 461 is adjusted polarization state, impinge perpendicularly on polarization splitting prism 47, incident light is divided into two-way: its transmitted light, after half-wave plate 462 is adjusted into the S polarization state, by spatial light modulator 49 modulation, constitute the required thing light of record, be 1.1GW with its optical power adjustment; Its reflected light through phase compensation device 410, catoptron 454, constitutes the required reference light of record, and its optical power adjustment is 0.8GW.Spatial light modulator 49, fourier transform lens 433, recording medium 400, inverse fourier transform lens 434, detector C CD200 constitute typical 4F structure, realize reading of fourier spectra holographic recording and thing light.Reference light and thing light become an angle of 90 degrees to incide to place the recording medium 400 of spectrum face position to interfere, produce the two-photon absorption effect and form grating, thus fast recording a data page.
2, monochromatic light daughter holographic data readout.Close pulsed laser 411, the laser of the 1064nm that continuous low power laser instrument 412 produces is after pinhole filter and collimation lens expand bundle, collimation, after catoptron 453, polarization splitting prism 47 transmissions, through phase compensation device 410, catoptron 454, constitute and read light, it reads light intensity is 100 μ W/cm
2, read light between polarization splitting prism 47 and recording materials 400 when light path and holographic recording the reference light light path of corresponding position identical.Realized that so just the non-volatile of information read.
3, the erase process of recorded information.Close pulsed laser 411 and continuous low power laser instrument 412, open ultraviolet source 413, the light that goes out from this light source 413 is after pin hole filtering, expanding bundle, collimation, make it aim at the zone that recording materials will be wiped, just can wipe this position institute data information stored, thus realized data message repeat erasable.
Claims (2)
1, a kind of method of non-volatile gonosome holographic data storage, it is characterized in that, adopt the photochromic material as the body holographic recording medium, by the two-photon record, single photon is read and ultraviolet light is wiped and realized the data message fast recording, non-volatilely reads and repeatedly repeats erasable; May further comprise the steps:
1) two-photon body holographic data-recording process: at first, according to the absorption spectra characteristic of photochromic material, the pulsed laser that selection is complementary with it is as the light source of recording light, and this recording light wavelength is beyond the linear absorption zone of photochromic material; The light that this pulsed laser sends is divided into thing light and reference light two-beam, makes holographic recording medium place thing light and reference light coherent field; Secondly, regulate the light intensity of recording light, the light intensity of coherent field that makes thing light and reference light is greater than the intensity that makes the reaction of recording medium generation two-photon absorption, and less than the light intensity damage thresholding of this recording medium; At last, regulate the optical path difference of reference light and thing light, the optical path difference that makes two-beam is in the coherent length of pulsed laser;
2) monochromatic light daughter holographic data readout: select the low-power continuous wave laser identical as the light source of reading light, regulate the light path of reading light and make it identical, realize that promptly the non-volatile of data read with described reference light light path with the recording light wavelength.
2, the method for non-volatile gonosome holographic data storage as claimed in claim 1, it is characterized in that, the erase process that also comprises recorded information: adopt the ultraviolet source emergent light, make it aim at the zone that this recording medium will be wiped, just can wipe this position institute data information stored.
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| CN100440332C (en) * | 2005-06-03 | 2008-12-03 | 清华大学 | Automatic focusing and path tracking device and method for double photon three dimension disc type storage |
| CN101217044B (en) * | 2007-12-29 | 2011-05-11 | 清华大学 | Phase amplitude conversion method and device adaptable for volume hologram memory |
| CN103000191B (en) * | 2012-12-04 | 2016-05-18 | 清华大学 | A kind of method that dynamic refresh body hologram three-dimensional shows |
| CN108877844B (en) * | 2018-04-09 | 2020-04-03 | 中国科学院上海光学精密机械研究所 | Two-photon two-beam super-resolution optical storage material reading and writing device and method |
| CN108899053B (en) * | 2018-04-09 | 2020-04-03 | 中国科学院上海光学精密机械研究所 | Double-beam super-resolution optical storage material reading and writing device and method |
| CN113113065B (en) * | 2021-03-31 | 2022-04-26 | 华中科技大学 | Method and device for writing/reading double-beam super-resolution optical data |
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