CN1728246A - The photochromic material film is as the polarization holography light storage device of recording medium - Google Patents
The photochromic material film is as the polarization holography light storage device of recording medium Download PDFInfo
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Abstract
A kind of photochromic material film is as the polarization holography memory storage of recording medium, with spatial light modulator as page formula information input element, image acquisition device is as information read equipment, adopt the photochromic material film as recording medium, place it in recorded hologram on the frequency plane of fourier transform lens, utilize the photoinduced anisotropy of photochromic material, adopt mutually orthogonal linearly polarized light or orthogonal circular polarizations light hologram, improve the reproduced image signal to noise ratio (S/N ratio) as thing light and reference light record Polarization Modulation.Adopt bacteriorhodopsin,BR film or fulgide film as erasable holographic recording medium, have the luminous sensitivity height, the spatial resolution height, often erasable, fatigue resistence and good stability, advantages such as long service life.This device reconstructing hologram is as the signal to noise ratio (S/N ratio) height, and spatial reuse and angular multiplexed improves the density of data storage and capacity greatly simultaneously.
Description
Technical field
The present invention relates to a kind of holographic optical memory storage, relate in particular to a kind of photochromic material film that adopts as the angular multiplexed polarization holography light storage device of the Fourier transform of recording medium.
Background technology
High density, high capacity, high access speed are that the direction of optical storage technology develops, and the holographic optical storage is because of having high one of the important development direction of optical storage that becomes of storage density height, storage high capacity and data access speed.The key that the holographic optical storage improves storage density and capacity is to adopt multiplex technique, as angular multiplexed, wavelength multiplexing, spatial reuse etc.; Because the holographic optical storage adopts parallel information to write and reading method, write-once and the data volume of reading can be very big, thereby the data access speed height.Holographic recording medium is one of key factor of holographic optical storage.Holographic recording medium is a lot, as silver halide salt, dichromated gelatin, photopolymer, photorefractive crystal, photochromic material etc.; Wherein silver halide salt, dichromated gelatin, photopolymer are disposable service recorder media; Photorefractive crystal and photochromic material are erasable recording mediums, and need not aftertreatments such as development, photographic fixing, thereby have significant technical advantage.The holographic optical memory storage adopts block photorefractive crystal repeatedly to read holographic recording medium as erasable holographic recording medium or employing photopolymer film as write-once mostly at present, utilizes angular multiplexed technology can carry out the storage of high density high capacity.This hologram record be the intensity modulated grating, thing light must have identical polarized component with reference light, if the polarization direction of thing light and reference light is vertical mutually, the light intensity of then synthetic light field is not modulated, and can not form the intensity modulated grating.If but recording medium has photoinduced anisotropy (photic birefringence or photodichroism), modulation variation will take place for the absorption coefficient or the refractive index of polarized light in medium under synthetic light field irradiation, thereby can note the Polarization Modulation grating.When with the polarized illumination hologram, just can reveal thing light wave again with its polarization state quadrature.The necessary condition that realizes polarization holography is that recording medium has photoinduced anisotropy, and its advantage is the reproduction picture that can obtain high s/n ratio than common holography.
Summary of the invention
The purpose of this invention is to provide a kind of with the photochromic material film as erasable holographic recording medium, utilize its photoinduced anisotropy to carry out the cross polarization holographic recording, obtain the High-Density Holographic light storage device that high s/n ratio reproduces picture, it has solved, and common holographic optical memory storage reproduces as the low technical matters of signal to noise ratio (S/N ratio) in the background technology.
Technical solution of the present invention is: a kind of photochromic material film comprises read write laser 1, gross shutter 2, polarization splitting prism 3, thing light path, reference path, holographic recording medium 12 as the polarization holography light storage device of recording medium; Described gross shutter 2, polarization splitting prism 3, thing light path are successively set on the direction of propagation of read write laser 1 emission light beam; Described thing light path comprises thing optical shutter 4, beam-expanding collimation lens combination 5, spatial light modulator 6, first fourier transform lens 7, thing light spatial filtering diaphragm 8, the first inverse fourier transform lens 9 and second fourier transform lens 11, its spatial light modulator 6 is positioned at the front focal plane of first fourier transform lens 7, thing light spatial filtering diaphragm 8 is positioned at the back focal plane of first fourier transform lens 7, the front focal plane of the first inverse fourier transform lens 9 overlaps with the back focal plane of first fourier transform lens 7, the back focal plane of the first inverse fourier transform lens 9 overlaps with the front focal plane of second fourier transform lens 11, and holographic recording medium 12 is positioned at the back focal plane of second fourier transform lens 11; Described reference path comprises catoptron 13, variable optical attenuator 14, reference light spatial filtering diaphragm 16, rotating mirror 17, first lens 18 and second lens 19, wherein catoptron 13 is arranged on the polarization splitting prism 3 folded light beam directions of propagation, first lens 18 and second lens 19 constitute the 4F structure, rotating mirror 17 is positioned at the front focal plane of lens 18, and holographic recording medium 12 is positioned at the back focal plane of lens 19.
Above-mentioned thing light path also comprises the thing light quarter-wave plate 10 that is arranged between the first inverse fourier transform lens 9 and second fourier transform lens 11; Above-mentioned reference path also comprises the reference light quarter-wave plate 15 that is arranged between variable optical attenuator 14 and the reference light spatial filtering diaphragm 16.
Above-mentioned holographic optical memory storage comprises polaroid 21, the second inverse fourier transform lens 22, diffraction light shutter 23, the image acquisition device 24 that is successively set on read write laser 1 direction of beam propagation, wherein polaroid 21 is between the holographic recording medium 12 and the second inverse fourier transform lens 22, the front focal plane of the second inverse fourier transform lens 22 overlaps with the back focal plane of second fourier transform lens 11, and the photosurface of image acquisition device 24 is positioned at the back focal plane of the second inverse fourier transform lens 22.
Above-mentioned thing light path comprises the thing light quarter-wave plate 10 that is arranged between the first inverse fourier transform lens 9 and second fourier transform lens 11; Described reference path comprises the reference light quarter-wave plate 15 that is arranged between variable optical attenuator 14 and the reference light spatial filtering diaphragm 16; Be provided with diffraction light quarter-wave plate 20 between described holographic recording medium 12 and the polaroid 21.
Above-mentioned holographic optical memory storage comprises wipes laser instrument 25, described wipe laser instrument 25 for output wavelength near photochromic material metastable state absorption peak continuously or pulsed laser, light beam crossing coincidence on holographic recording medium 12 of its light beam and described read write laser 1.
Above-mentioned holographic recording medium 12 is for having the photochromic material film of photoinduced anisotropy, and described photochromic material film is bacteriorhodopsin,BR film in the biological molecular material or the fulgide film in the organic molecule material.
The present invention has following advantage:
1, the fulgide film is as erasable holographic recording medium to use biomolecule photochromic material---bacteriorhodopsin,BR film or organic photochromic material---, has the luminous sensitivity height, the spatial resolution height, fatigue resistence and good stability, the advantage of long service life.
2, utilize the photoinduced anisotropy of photochromic material, adopt orhtogonal linear polarizaiton light or orthogonal circular polarizations light, record Polarization Modulation hologram.Recording medium has photoinduced anisotropy (photic birefringence or photodichroism), modulation variation will take place for the absorption coefficient or the refractive index of polarized light in medium under synthetic light field irradiation, thereby can note the Polarization Modulation grating, when with the polarized illumination hologram, just can reveal the thing light wave with its polarization state quadrature again, can obtain thus than the common holography reproduction picture of high s/n ratio more.
3, recorded hologram on the frequency plane of fourier transform lens, angular multiplexed and spatial reuse improves the density of data storage and capacity simultaneously.
The explanation of accompanying drawing drawing
Fig. 1 is the polarization holography light storage device synoptic diagram of photochromic material film as recording medium;
When Fig. 2 is orhtogonal linear polarizaiton light and quadrature garden polarized light record, the rule that the recording medium internal interference field polarization state cycle changes;
When Fig. 3 is the hologram reconstruction of orhtogonal linear polarizaiton light and quadrature garden polarized light record, diffraction polarization state of light and relation with reference to polarization state of light;
Fig. 4 adopts the 4F structure in the reference path, realize angular multiplexed schematic diagram by rotating mirror, changes though be characterized in the reference light incident angle, and it is at recording medium place incidence point invariant position, and is always plane wave;
Fig. 5 is a biomolecule photochromic material among the embodiment---the ground state (B attitude) of bacteriorhodopsin,BR film and the absorption spectrum of metastable intermediate state (M attitude).
Embodiment
As erasable holographic recording medium, use a kind of biomolecule photochromic material---bacteriorhodopsin,BR or organic photochromic material---fulgide with photochromic material film among the embodiment with photoinduced anisotropy.Bacteriorhodopsin,BR film or fulgide film are (as gelatin by bacteriorhodopsin,BR or fulgide and high molecular polymer; polyvinyl alcohol (PVA); PMMA etc.) be mixed with film on clear glass by a certain percentage, also can cover on it layer of transparent protective layer used in protective film not by mechanical damage.Bacteriorhodopsin,BR is a kind of photosensitive protein matter that extracts from Halophiles, and full name is bacteria rhodopsin (bacteriorhodopsin), is called for short bacteriorhodopsin,BR or BR.Bacteriorhodopsin,BR can be wild type, the chemical modification type or gene modified version.What use in the present embodiment is a kind of BR-D96N bacteriorhodopsin,BR film of gene modified version, and the about 80m of film thickness, accompanying drawing 5 are absorption spectrums of its ground state (B attitude) and metastable intermediate state (M attitude), and the absorption peak of B attitude is at 570nm, and the absorption peak of M attitude is at 410nm.Present embodiment is selected wavelength 633nm, and the continuous He-Ne laser instrument of power 2mW is as record and read light source.Hologram is wiped the semiconductor laser that light source is wavelength 405nm.
When adopting the orhtogonal linear polarizaiton optical recording, the photochromic material film comprises read write laser 1, gross shutter 2, polarization splitting prism 3, thing light path, reference path, holographic recording medium 12 as the polarization holography light storage device of recording medium; Gross shutter 2, polarization splitting prism 3, thing light path are successively set on the direction of propagation of read write laser 1 emission light beam; The thing light path comprises thing optical shutter 4, beam-expanding collimation lens combination 5, spatial light modulator 6, first fourier transform lens 7, thing light spatial filtering diaphragm 8, the first inverse fourier transform lens 9 and second fourier transform lens 11, its spatial light modulator 6 is positioned at the front focal plane of first fourier transform lens 7, thing light spatial filtering diaphragm 8 is positioned at the back focal plane of first fourier transform lens 7, the front focal plane of the first inverse fourier transform lens 9 overlaps with the back focal plane of first fourier transform lens 7, the back focal plane of the first inverse fourier transform lens 9 overlaps with the front focal plane of second fourier transform lens 11, and holographic recording medium 12 is positioned at the back focal plane of second fourier transform lens 11; Reference path comprises catoptron 13, variable optical attenuator 14, reference light spatial filtering diaphragm 16, rotating mirror 17, first lens 18 and second lens 19, wherein catoptron 13 is arranged on the polarization splitting prism 3 folded light beam directions of propagation, first lens 18 and second lens 19 constitute the 4F structure, rotating mirror 17 is positioned at the front focal plane of lens 18, and holographic recording medium 12 is positioned at the back focal plane of lens 19.
When adopting the orthogonal circular polarizations optical recording, thing light can be in the thing light path be set with quarter-wave plate 10 between the first inverse fourier transform lens 9 and second fourier transform lens 11, reference light be set with quarter-wave plate 15 between variable optical attenuator 14 and the reference light spatial filtering diaphragm 16 in reference path.
When adopting orhtogonal linear polarizaiton light to read, the holographic optical memory storage also comprises polaroid 21, the second inverse fourier transform lens 22, diffraction light shutter 23, the image acquisition device 24 that is successively set on read write laser 1 direction of beam propagation, wherein polaroid 21 is between the holographic recording medium 12 and the second inverse fourier transform lens 22, the front focal plane of the second inverse fourier transform lens 22 overlaps with the back focal plane of second fourier transform lens 11, and the photosurface of image acquisition device 24 is positioned at the back focal plane of the second inverse fourier transform lens 22.
When adopting orthogonal circular polarizations light to read, thing light can be in the thing light path be set with quarter-wave plate 10 between the first inverse fourier transform lens 9 and second fourier transform lens 11, reference light is set with quarter-wave plate 15 between variable optical attenuator 14 and the reference light spatial filtering diaphragm 16 in reference path, diffraction light quarter-wave plate 20 is set between holographic recording medium 12 and polaroid 21.
In the time of need wiping hologram, the holographic optical memory storage can be provided with wipes laser instrument 25, wipe laser instrument 25 for output wavelength near photochromic material metastable state absorption peak continuously or pulsed laser, light beam crossing coincidence on holographic recording medium 12 of its light beam and read write laser 1.
As shown in Figure 1, unpolarized He-Ne laser 1 forms mutually orthogonal linear polarization thing light (horizontal polarization) and reference light (vertical polarization) after polarization splitting prism 3 beam splitting.Thing light is through the even lighting space photomodulator 6 in beam-expanding collimation device 5 backs.First Fourier transform lens 7 and the first Fourier inversion lens 9 are formed the 4F structure, and spatial light modulator 6 is positioned at the front focal plane of first Fourier transform lens 7, and thing light spatial filtering diaphragm 8 is positioned at the back focal plane of first Fourier transform lens 7; Frequency spectrum behind 9 pairs of spatial filterings of the first Fourier inversion lens carries out inverse fourier transform, forms the picture of spatial light modulator 6 after low-pass filtering at its back focal plane.Second Fourier transform lens 11 and the first Fourier inversion lens 9 are confocal, and the picture of the front focal plane of second Fourier transform lens 11 forms frequency spectrum through Fourier transform at its back focal plane.Second Fourier transform lens 11 and the second Fourier inversion lens 22 are formed another 4F structure, holographic recording medium 12 is positioned at the back focal plane place record Fourier transform frequency spectrum hologram of second Fourier transform lens 11, through behind the inverse fourier transform of the second Fourier inversion lens 22 in its back focal plane place imaging.Ccd image sampler 24 is positioned at the back focal plane place of the second Fourier inversion lens 22, picked-up image and diffraction image.
Reference path at first through catoptron 13 with light path folding, again through reference light spatial filtering diaphragm 16 intercepting Gaussian beam central light strengths part uniformly, reference light is reflexed on the holographic recording medium 12 through rotating mirror 17 then and overlaps with thing light.Reference light and thing light are the same side that 90 ° of angles are incident in holographic recording medium 12, can the symmetry also can be asymmetric in the normal direction of holographic recording medium 12.Angular multiplexed in order to realize, another 4F structure that is made of first lens 18 and second lens 19 is set between rotating mirror 17 and holographic recording medium 12, can change the reference light incident angle by rotating mirror 17 like this, guarantee the launching spot invariant position of reference light simultaneously at holographic recording medium 12, its light path principle figure as shown in Figure 4, the change amount of reference angle is 2 times of the catoptron anglec of rotation.
During holographic recording, close diffraction light shutter 23 and enter image acquisition device 24, open thing optical shutter 4, by the control 2 controlling recording time shutter of gross shutter with restraining mass light.Continuous adjustable variable optical attenuator 14 is used for instrumentality light and with reference to the ratio of light intensity.By rotating rotating mirror 17 to different angles, can be at several holograms of the same space location records of holographic recording medium 12.By mobile holographic recording medium 12, can also write down several holograms in different locus.If adopt quadrature garden polarized light record, need difference admixture light quarter-wave plate 10 and reference light quarter-wave plate 15 in thing light and reference path, thing light and reference light are become left-handed and right-handed polarized light respectively.
When the reconstruction of hologram is read, close thing optical shutter 4 restraining mass light, open diffraction light shutter 23 and receive diffraction light, reproduce by control gross shutter 2 and read.Regulate variable optical attenuator 14 and can control playback light intensity.Corresponding angle can select to read each width of cloth hologram that needs reproduction respectively when rotating rotating mirror 17 to holographic recording.Mobile holographic recording medium 12 corresponding position during to holographic recording, can playback record at the hologram of different spatial.Polaroid 21 is used for selecting to stop scattered noise by diffraction light, reaches the purpose that improves signal to noise ratio (S/N ratio).If recording mode is a quadrature garden polarized light record, then need before polaroid 21, to add diffraction light quarter-wave plate 20, make the diffraction light of quadrature garden polarization and diffraction light and the scattered noise that scattered noise changes orhtogonal linear polarizaiton into.
The principle of the invention:
What common holography was used is that thing light and the reference light with identical polarization direction interfered formation intensity modulation grating.The thing light of cross polarization holography and reference light have mutually orthogonal polarization direction (mutually orthogonal linearly polarized light or mutually orthogonal circularly polarized light), and the light distribution of the interference field of formation is uniformly, can not produce the intensity modulated grating.But the polarization state of the interference field that cross polarization produces is a periodic modulation, can form the polarization state modulated grating, as shown in Figure 2.To the isotropy recording medium of light intensity response, can't write down the polarization state modulated grating for only.And to having the recording medium of photoinduced anisotropy, molecule can produce response to polarization state of light, the cycle variation of interference field polarization state can cause that the cycle of electric dipole moment of molecule orientation changes, molecule produces the optical axis along elliptically polarized light long axis direction or linearly polarized light polarization direction, the orientation of electric dipole moment is vertical with optical axis direction, produces to have the character of similar uniaxial crystal.Some photochromic materials have this photoinduced anisotropy, therefore can realize the cross polarization hologram record of the two-beam that polarization state is mutually orthogonal.
When with polarization reference light reconstructing hologram, the polarization grating that writes down on the holographic recording medium is to the reference light diffraction, and formation comprises intensity, the diffraction image of phase place and polarization information.The diffraction polarization state of light has relation with reproduction with reference to polarization state of light and record polarization state of light, as shown in Figure 3.Diffraction efficiency is relevant with reproduction reference light polarization state with the recording light polarization state, when reproducing with former reference light, can obtain the highest diffraction efficiency, and the diffraction light polarization is total and the playback light polarized orthogonal, promptly, if with the linearly polarized light record of quadrature, with former reference light reproduction, then diffraction light is the linearly polarized light with the reference light quadrature; If with the garden polarized light record of quadrature, with former reference light reproduction, then diffraction light is the garden polarized light with the reference light quadrature.Orthogonal circular polarizations optical recording diffraction efficiency of hologram is suitable with common diffraction efficiency with the polarization recorded hologram; Orhtogonal linear polarizaiton optical recording diffraction efficiency of hologram is about the former half.
Scattered noise is generally partial poolarized light, and major part is and reproduces the identical composition of reference light polarization state.For orhtogonal linear polarizaiton optical recording situation, reproduce and can before image acquisition device, place analyzer when reading, select to stop the scattered noise with its quadrature to enter image acquisition device by diffraction image; For the polarized light record case of quadrature garden, when reproduction is read except before image acquisition device, placing analyzer, also need before analyzer, to place again quarter-wave plate, make mutually orthogonal garden polarized light become mutually orthogonal linearly polarized light, and then isolate diffraction image and stop scattered noise with analyzer, realize improving the purpose of signal to noise ratio (S/N ratio).
Claims (6)
1, a kind of photochromic material film is characterized in that as the polarization holography light storage device of recording medium: described holographic optical memory storage comprises read write laser (1), gross shutter (2), polarization splitting prism (3), thing light path, reference path, holographic recording medium (12); Described gross shutter (2), polarization splitting prism (3), thing light path are successively set on the direction of propagation of read write laser (1) emission light beam; Described thing light path comprises thing optical shutter (4), beam-expanding collimation lens combination (5), spatial light modulator (6), first fourier transform lens (7), thing light spatial filtering diaphragm (8), the first inverse fourier transform lens (9) and second fourier transform lens (11), its spatial light modulator (6) is positioned at the front focal plane of first fourier transform lens (7), thing light spatial filtering diaphragm (8) is positioned at the back focal plane of first fourier transform lens (7), the front focal plane of the first inverse fourier transform lens (9) overlaps with the back focal plane of first fourier transform lens (7), the back focal plane of the first inverse fourier transform lens (9) overlaps with the front focal plane of second fourier transform lens (11), and holographic recording medium (12) is positioned at the back focal plane of second fourier transform lens (11); Described reference path comprises catoptron (13), variable optical attenuator (14), reference light spatial filtering diaphragm (16), rotating mirror (17), first lens (18) and second lens (19), wherein catoptron (13) is arranged on polarization splitting prism (3) the folded light beam direction of propagation, first lens (18) and second lens (19) constitute the 4F structure, rotating mirror (17) is positioned at the front focal plane of lens (18), and holographic recording medium (12) is positioned at the back focal plane of lens (19).
2, photochromic material film according to claim 1 is characterized in that as the polarization holography light storage device of recording medium: described thing light path comprises the thing light quarter-wave plate (10) that is arranged between the first inverse fourier transform lens (9) and second fourier transform lens (11); Described reference path comprises the reference light quarter-wave plate (15) that is arranged between variable optical attenuator (14) and the reference light spatial filtering diaphragm (16).
3, photochromic material film according to claim 1 is as the polarization holography light storage device of recording medium, it is characterized in that: described holographic optical memory storage comprises the polaroid (21) that is successively set on read write laser (1) direction of beam propagation, the second inverse fourier transform lens (22), diffraction light shutter (23), image acquisition device (24), wherein polaroid (21) is positioned between the holographic recording medium (12) and the second inverse fourier transform lens (22), the front focal plane of the second inverse fourier transform lens (22) overlaps with the back focal plane of second fourier transform lens (11), and the photosurface of image acquisition device (24) is positioned at the back focal plane of the second inverse fourier transform lens (22).
4, photochromic material film according to claim 3 is characterized in that as the polarization holography light storage device of recording medium: described thing light path comprises the thing light quarter-wave plate (10) that is arranged between the first inverse fourier transform lens (9) and second fourier transform lens (11); Described reference path comprises the reference light quarter-wave plate (15) that is arranged between variable optical attenuator (14) and the reference light spatial filtering diaphragm (16); Be provided with diffraction light quarter-wave plate (20) between described holographic recording medium (12) and the polaroid (21).
5, according to claim 1 or 2 or 3 or 4 described photochromic material films polarization holography light storage device as recording medium, it is characterized in that: described holographic optical memory storage comprises wipes laser instrument (25), the described laser instrument (25) of wiping is the continuous or pulsed laser of output wavelength near photochromic material metastable state absorption peak, and its light beam is gone up to intersect at holographic recording medium (12) with the light beam of described read write laser (1) and overlapped.
6, photochromic material film according to claim 5 is as the polarization holography light storage device of recording medium, it is characterized in that: described holographic recording medium (12) is for having the photochromic material film of photoinduced anisotropy, and described photochromic material film is bacteriorhodopsin,BR film in the biological molecular material or the fulgide film in the organic molecule material.
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| US7816059B2 (en) | 2006-07-11 | 2010-10-19 | Fuji Xerox Co., Ltd. | Hologram recording material, hologram recording medium and hologram recording method |
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