CN101763019B - Light beam generator and digital holography device for hypervelocity holography - Google Patents
Light beam generator and digital holography device for hypervelocity holography Download PDFInfo
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- CN101763019B CN101763019B CN200910189346XA CN200910189346A CN101763019B CN 101763019 B CN101763019 B CN 101763019B CN 200910189346X A CN200910189346X A CN 200910189346XA CN 200910189346 A CN200910189346 A CN 200910189346A CN 101763019 B CN101763019 B CN 101763019B
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Abstract
The invention relates to a light beam generator and a digital holography device for hypervelocity holography. The light beam generator comprises a pulsed laser and a multi-mode fiber coupler, wherein the multi-mode fiber coupler comprises an odd number of output ends on the same plane, and the number of the output ends is the same as that of beam splitting laser pulses; the optical fiber length differences among all the output ends are determined on the basis of a preset relative time delay, and the positions of all the output ends on the plane are determined on the basis of a preset spatial orientation angular difference; and the arrangement of the output ends ensures that any two output ends do not form central symmetry. The digital holography device comprises the light beam generator and a subsequent optical system, wherein the subsequent optical system comprises a second lens and a photosensitive device. By implementing the invention, laser pulses having different spatial orientation angle codes and strictly controlled relative time delays can be conveniently obtained so as to form a plurality of hypervelocity holographic images, and the invention has simple and compact structure and high system stability and reliability.
Description
Technical field
The present invention relates to laser holography, more particularly, relate to a kind of several digital hologram camera heads that are used for the hypervelocity imaging.
Background technology
Utilize the concurrency of holographic multiparameter and light wave, realize several codings of hypervelocity photography easily, therefore, utilize principle of holography to realize that several hypervelocity photographies are key areas of non-pipe hypervelocity technology, have important academic significance and application prospect.
Along with ultra-short pulse laser technology and CCD technology rapid development, utilize ultrashort pulse digital holography record and reproduce ultrafast dynamic process to have demonstrated its superiority of not replacing gradually.Utilize the ultrashort pulse digital holography, can in the extremely short time, carry out multiexposure, multiple exposure continuously, thereby can interfere resulting several hologram records on the CCD photosurface thing optical pulse train and reference light pulse string the thing field of ultrafast variation.The fs holography photographic frequency can reach 10
12The width of cloth/more than second, no matter present camera work is the non-pipe camera work of image converter tube camera work or other class, can't reach at all.The multiple-pulse technology of utilizing reference light coding and space to separate is one of effective way that solves this class problem.The coding method that is applicable to ultrashort pulse hypervelocity digital holography at present has angular coding (a plurality of angles in the same meridian ellipse), position angle coding (all angles are in the different meridian ellipses), Wavelength-encoding and plane of polarization coding.Wherein the plane of polarization coding can only obtain 2 width of cloth subholograms, and Wavelength-encoding needs light source that multi-wavelength output is arranged.The characteristics of angular coding and position angle coding are that the paired pulses light source does not have special requirement, can obtain the above sub-holographic recording of 2 width of cloth.The reference light that this technology utilizes incident angle to have nothing in common with each other is recorded in the different information constantly of ultrafast process on the same two field picture of CCD, thereby obtains a composite hologram that comprises many subholograms.During reproduction, the characteristic that can utilize subhologram to separate in spectrum space is used digital filtering method that the hologram frequency spectrum is carried out the filtering separation and carries out the corresponding digital reproduction, thereby several reproduced images is outputed on the display respectively.The reference light of different angles transmission is in the same plane in the angular coding, because the restriction of CCD Pixel Dimensions, generally the angle to thing light and reference light requires comparatively strict.Become θ on same plane but relative optical axis
1, θ
2Reference light (θ
1＞θ
2), then must satisfy
Wherein λ is a wavelength, and d is the photosensitive unit size.f
1max, f
2maxMaximum spatial frequency (the Wang Xiaolei of the holographic interference pattern that the band limit of serving as reasons thing light wave and two bundle reference light waves form respectively; Zhai Hongchen; Wang Yi; Home country's light, Acta Physica Sinica, 2006, Vol.55, P1137).If adopt the position angle coding,, make spatial frequency spectrum component each other be easier to separate because the hologram that the reference light of Different Plane forms has different spatial orientations.Scholars have done some comparatively deep researchs in this respect.For example: utilize a reflection mirror array of forming by independent controlled four sides catoptron, the reference light of formation space different angles, to femto-second laser pulse respectively at CS
2Nonlinear effect during with water transmission carried out several holographic recordings (Martin Centurion, Ye Pu, and Demetri Psaltis, Proc.of SPIE, 2005, Vol.5580, P529); Adopt a plurality of beam splitters and mirror structure to realize the position angle coding, and realized instantaneous measurement (Xiaolei Wang, Hongchen Zhai strong laser induced air ionization ultrafast process with this technology, andGuoguang Mu, OPTICS LETTERS, 2006, Vol.31, P1636).
But, no matter be to adopt the reflection mirror array of forming by independent controlled four sides catoptron or adopt a plurality of beam splitters and catoptron, this class uses the light-dividing device that is made of the discrete optical element to produce the technical scheme of multi beam reference light, because many, the complex structure of optical element, the distance between each optical element and the adjustment of angle are very complicated, very difficult to be realized accurately controlling, make the angle and the relative time of reference light postpone wayward, be difficult to realize that precise time postpones, thereby imaging frequency is difficult to further raising.
In addition,, be vulnerable to machinery, electrically driven (operated) influence in the operational process, make system's instability, poor reliability because light-dividing device is made of many discrete optical elements.
Summary of the invention
The technical problem to be solved in the present invention is, adjust complicated at the light-dividing device of the holography system of prior art, the attitude of reference light and relative time postpone to be difficult to the accurately defective of control, a kind of holographic light beam generator of hypervelocity that is used for is provided, and it can be accurately, postpone to generate needed light beam according to predetermined reference light attitude and relative time easily.
Another technical matters that the present invention will solve is, adjust complicated at the holography system of prior art, the attitude of reference light and relative time postpone to be difficult to the accurately defective of control, and a kind of digital hologram camera that can accurately control reference light attitude and relative time delay is provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of holographic light beam generator that is used for, comprising:
Pulsed laser is used to produce the source laser pulse;
Multi-module optical fiber coupler, it receives described source laser pulse, and described source laser pulse is resolved into a plurality of beam splitting laser pulses of the dimensional orientation angle difference that has predetermined relative time delay each other and be scheduled to;
Wherein, described multi-module optical fiber coupler comprises a plurality of output terminals in the same plane, wherein each output terminal is connected to the light output component of described multi-module optical fiber coupler by multimode optical fiber, the number of described output terminal is identical with the number of described beam splitting laser pulse, fiber lengths difference between each output terminal postpones based on described predetermined relative time and determines, the position of each output terminal on described plane determined based on described predetermined dimensional orientation angle difference, and the number of the output terminal of described multi-module optical fiber coupler is an odd number, and the layout of described output terminal makes and do not constitute the center symmetry between any two described output terminals.
In light beam generator of the present invention, be provided with first lens between described pulsed laser and the described multi-module optical fiber coupler, the source laser pulse of described pulsed laser output enters the input end of described multi-module optical fiber coupler through described first Lens Coupling; Wherein, described first lens are spherical lens, non-spherical lens, cylindrical lens or axicon lens.
In light beam generator of the present invention, the input end of described multi-module optical fiber coupler is provided with the taper optical fibre light splitting device of many root multimode fibers head welding, and the source laser pulse of described pulsed laser output enters described taper optical fibre light splitting device through described first Lens Coupling.
In light beam generator of the present invention, a plurality of output terminals of described multi-module optical fiber coupler are in upper edge, described plane one circle distribution.
In light beam generator of the present invention, the orientation of the fiber end face of described each output terminal is selected to determine based on described predetermined dimensional orientation angle difference.
In light beam generator of the present invention, described a plurality of output terminals each other be adjustable at interval.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of several digital hologram cameras, it is characterized in that, comprise aforesaid light beam generator and subsequent optical system; Wherein, described subsequent optical system comprises second lens and sensor devices, the residing plane of a plurality of output terminals of described multi-module optical fiber coupler and the front focal plane coplane of described second lens, the light-sensitive surface of described sensor devices is positioned at the rear of the back focal plane of described second lens.
In several digital hologram cameras of the present invention, described subsequent optical system also comprises the 3rd lens that are arranged between described second lens and the described sensor devices, the back focal plane coplane of the front focal plane of described the 3rd lens and described second lens, the light-sensitive surface of described sensor devices are positioned at the place ahead or the rear of the back focal plane of described the 3rd lens.
In several digital hologram cameras of the present invention, described pulsed laser is that pulsewidth is 10
-11To 10
-14The ultrashort pulse width laser device of second, described sensor devices is the Charge Coupled Device (CCD) imageing sensor.
In several digital hologram cameras of the present invention, a plurality of output terminals of described multi-module optical fiber coupler are in upper edge, described plane one circle distribution, and the center of circle of described circumference is positioned on the optical axis of described subsequent optical system.
In several digital hologram cameras of the present invention, described a plurality of output terminals each other be adjustable at interval.
In several digital hologram cameras of the present invention, the bore D of described second lens and the output terminal of described multi-module optical fiber coupler are to distance R, the numerical aperture angle θ of described multimode optical fiber and the focal distance f of second optical lens of described optical axis
1Between satisfy following relation:
D≥2(R+f
1tgθ)。
Implement the present invention, has following beneficial effect: owing to adopt fiber coupler to substitute the light-dividing device that discrete elements constitutes, only utilize a simple compact multi-module optical fiber coupler just can obtain having the light pulse of different spaces position angle and the strict control of relative time delay, make simple in structurely, compact, be convenient to adjust.In addition, owing to optical fiber, lens etc. all are transmission optical components, compared with reflective optical devices, de-stabilising effect to system is much smaller, used optical element is passive type, does not have machinery, electric driving factors in the operational process, thereby Stability Analysis of Structures, system are reliably high.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic diagram of several digital hologram cameras of the present invention;
Fig. 2 is the structural representation of several digital hologram cameras according to an embodiment of the invention;
Fig. 3 is aperture of lens estimation figure in several digital hologram devices of the present invention.
Embodiment
In order to realize accurate portrayal, need write down subhologram as much as possible at interval with precise time in the moment that incident takes place to some ultrafast process.One object of the present invention is exactly in order to realize that easily position angle coding to obtain the different beamlet of space angle as much as possible, realizes the accurate control that the optics between the azimuthal light beam of these different spaces is delayed simultaneously.If be aided with " light chi " that ultrashort laser pulse just can obtain having high time resolution, high precision sample interval like this, satisfy needs to the imaging of ultrafast variation things high precision.
Core of the present invention is the time delay of utilizing multi-module optical fiber coupler to carry out beam splitting and realizing between the object beam by the optical path difference of controlling each road light beam determining, have accurate relative time delay and the different reference light of attitude thereby produce, realize several Digital Holography of position angle coding.
Fig. 1 is the schematic diagram of several digital hologram devices of the present invention, and it comprises light beam generator and subsequent optical system.As shown in Figure 1, light beam generator comprises pulsed laser 10, the first lens L0 and multi-module optical fiber coupler 20; The subsequent optical system comprises the second lens L1 and sensor devices 40, wherein f
1It is the focal length of the second lens L1.Multi-module optical fiber coupler comprises a plurality of output terminals in the same plane (shown in the dot on the circumference 25), constitutes an output end face, and wherein each output terminal is connected to the light output component of described multi-module optical fiber coupler by multimode optical fiber.The first lens L0 is a spherical lens in the present embodiment.According to specific embodiments, as an alternative, the first lens L0 can also be a non-spherical lens, also cylindrical lens, axicon lens.
In the course of the work, the source laser pulse of pulsed laser 10 outputs is coupled into multi-module optical fiber coupler 20 through the first lens L0, export a plurality of beam splitting laser pulses by the output terminal of multi-module optical fiber coupler 20, and the number of output terminal is identical with the number of beam splitting laser pulse.A plurality of beam splitting laser pulses have each other that predetermined relative time postpones and predetermined dimensional orientation angle poor.It is poor to calculate required relative time delay and dimensional orientation angle according to the parameter of each optical element in pulsed laser that is adopted and the subsequent optical system, the description that detail is seen below.Because holographic imaging has the advantages that the frequency spectrum of original image and conjugate image is symmetrical distribution, overlap each other for fear of between the image, the output terminal of multi-module optical fiber coupler 20 adopts the layout (for example 5 or 7 output terminals etc.) of odd number output terminal asymmetric distribution, make with respect to the intersection point of the optical axis of output end face and subsequent optical system, do not constitute the center symmetry between any two output terminals.Under non-centrosymmetrical condition between satisfied two output terminals, the output terminal of multi-module optical fiber coupler 20 can be arranged in perpendicular to the diverse location on the plane of subsequent optical systematic optical axis.For example, as an embodiment, the intersection point that a plurality of output terminals can be arranged in output end face and subsequent optical systematic optical axis is on the circumference 25 in the center of circle.That is to say, be the center with the center of circle of circumference 25, do not constitute the center symmetry between any two output terminals of multi-module optical fiber coupler 20.The fiber lengths difference of multi-module optical fiber coupler 20 each output terminal (shown in the dot on the circumference 25) is by the mutual time delay decision of output pulse.The plane at multi-module optical fiber coupler output end face place is arranged on the front focal plane of the second lens L1.Like this output light of each output terminal behind the second lens L1 with separately angle normal sheaf object under test S, these light transmissions or walk around object S after shine the light-sensitive surface of sensor devices 40 (for example can be Charge Coupled Device (CCD) imageing sensor (CCD array)), form accurate coaxial digital hologram interferogram.So in this device, different attitude light comprises corresponding to difference object shape information constantly corresponding to the subhologram of different directions interference fringe.
As selection, a plurality of output terminals of fiber coupler interval each other can be fixed, and also can be designed to adjustablely, finely tunes as required in photographic process, and is flexible.In addition, a plurality of output terminals of fiber coupler interval each other can be identical, also can be inequality.But must make between any two output terminals of multi-module optical fiber coupler 20 and not constitute the center symmetry.
For the scope of increaser light and reference light interference, can in the subsequent optical system of several digital hologram devices shown in Figure 1, introduce the 3rd lens L2, form one embodiment of the present invention, as shown in Figure 2.In the present embodiment, sensor devices 40 adopts Charge Coupled Device (CCD) imageing sensor (CCD) array.The output light of each output terminal of multi-module optical fiber coupler (shown in the dot on the circumference 25) behind the second lens L1 with separately angle normal sheaf object under test S.These light transmissions or walk around object S after the 3rd lens L2 shines the CCD array form accurate coaxial digital hologram interferogram.In the present embodiment, the CCD array can place the place ahead or rear one segment distance (figure only shows the CCD array in the situation from the 3rd lens L2 back focal plane rear L distance) of the 3rd lens L2 back focal plane.Among the figure, f
1Be the focal length of the second lens L1, f
2Be the focal length of the 3rd lens L2, L is the distance of CCD array to the three lens L2 back focal planes.
The present invention can be used for the holographic imaging of psec, femtosecond time resolution rate ultrafast process, and its light source can be used high power psec or femto-second laser.The laser instrument of the ultrashort pulsewidth of this class is sold at the commercial product that comparative maturity arranged, and can obtain at present that pulse energy reaches the millijoule magnitude, the burst length width is a femtosecond magnitude (10
-11Second is to 10
-14Second) ultrashort pulsewidth light pulse output.In order high-power light pulse to be coupled into multi-module optical fiber coupler, the core diameter of multimode optical fiber needs enough big (＞200 μ m).If necessary, the self-focusing optical fiber lens also can be set to increase the ability that coupling mechanism receives laser power at the input end of coupling mechanism.As an embodiment, the input end of multi-module optical fiber coupler is provided with the taper optical fibre light splitting device of many root multimode fibers head welding, the direct and taper optical fibre light splitting device coupling of pulsed laser output terminal.The pulsed laser output terminal is meant the output face of first lens.That is to say that taper optical fibre light splitting device is arranged on the input end of multi-module optical fiber coupler, taper optical fibre light splitting device has many root multimode fibers, and this optical fiber head welding forms taper.The light beam of pulsed laser output is coupled to taper optical fibre light splitting device by the output face of first lens.What in the present invention, the output terminal number adopted is 5,7,9,11 ... Deng, the number of the divided beams of generation correspondingly is 5,7,9,11 ... Deng, that is to say that the number of output terminal is identical with the number of beam splitting laser pulse.Because too much interference image will overlap, consider the requirement that the frequency spectrum of hologram image can not be obscured, the number of divided beams (being the number of the output terminal of fiber coupler) can not be too many, generally is no more than 15 in accurate in-line holography is used.Can determine the required time interval of each reproduced pulse (being the framing time) as required.In general, the framing time is designed to equal the time width of (perhaps greater than) light pulse.Determine the fiber lengths difference of each output arm of coupling mechanism then.For example, be the ultra-short pulse laser of 1 psec for pulsewidth, corresponding optical path difference is (0.3/n) mm, wherein n is the refractive index of optical fiber.The output end face of each fiber coupler be arranged at one with the perpendicular plane of the optical axis of subsequent optical system on.Their relative positions on this plane are decided as required, and are comparatively flexible.For example can be arranged in this plane and optical axes crosspoint is on the circumference in the center of circle, and the size of radius of circle depends on the needs that frequency spectrum separates, and in other words, just depends on a plurality of beam splitting laser pulses needs of dimensional orientation angle difference each other.The distance of this plane and subsequent optical lens equals the focal length of these lens, and in other words, this plane is the front focal plane of these lens.Like this coupling mechanism output terminal to the distance R of optical axis and the focal length of this optical lens (as the f among Fig. 1
1) determine the position angle of reference light jointly.In addition, in the output terminal of fiber coupler, the different orientation of fiber end face can be controlled the exit direction of light cone, thereby, by selection, can also finely tune the position angle of reference light to the fiber end face orientation.In addition, for reducing system loss, the bore D of lens should enough can collect most beam energies greatly.This relates to the coupling mechanism output terminal to the distance R of optical axis, the numerical aperture angle θ of multimode optical fiber and the focal distance f of optical lens
1Deng, can estimate by following formula by Fig. 3
D≥2(R+f
1tgθ) (2)
Object under test S places the second lens L1 rear, like this part light pulse of each output terminal of coupling mechanism output with difference constantly with different orientations incident object under test, and each pulse all has part light directly on the incident ccd array face, to produce accurate in-line holographic interferogram from the limit of object under test.Whole apparatus structure is very simple compact.Time interval of temporal resolution height, each framing hologram is short, is convenient to write down the phenomenon that the utmost point (surpass) changes at a high speed, more than the non-linear process of optical crystal and optical glass for example, relaxation time between subpicosecond and femtosecond.
Though be to be example in the embodiments of the invention, it is pointed out that light beam generating apparatus of the present invention can be applied in the various holography systems, in order to substitute the light-dividing device that constitutes by discrete elements with ultrashort pulse width laser and CCD device.Described various holography system, can adopt the pulsed laser source (need satisfy pulse width＜framing time) of various imaging frequencies, corresponding with the type of light source, sensor devices not only can adopt the CCD array, can also adopt CMOS or develop or remaining the sensor devices of other type of exploitation in the future at present.
Compared with prior art, light beam generator of the present invention has following advantage:
1) simple in structure, compact.Only utilize a simple compact multi-module optical fiber coupler and optical lens just can obtain having different spaces position angle and the strict light pulse of controlling of relative time delay.
2) easy to adjust.This mainly is because the characteristics of optical fiber determine.
3) Stability Analysis of Structures, reliable.Here optical fiber, lens etc. all are transmission optical components, and are compared with reflective optical devices, much smaller to the de-stabilising effect of system.In addition, used optical element is passive type, does not have machinery, electric driving factors in the operational process, and this system obviously has stability preferably.
4) relative time between the light pulse postpones by the decision of fiber lengths difference, precision height.
5) different orientation of fiber end face can be controlled the exit direction of light cone.
In addition, several digital hologram cameras of the present invention can maximally utilise the space-bandwidth product of CCD; The temporal resolution of several digital hologram cameras of the present invention can be used for psec, the time-resolved ultrafast holographic technique of femtosecond by the pulse width decision of LASER Light Source.
Claims (10)
1. one kind is used for the holographic light beam generator of hypervelocity, it is characterized in that, comprising:
Pulsed laser is used to produce the source laser pulse;
Multi-module optical fiber coupler, it receives described source laser pulse, and described source laser pulse is resolved into a plurality of beam splitting laser pulses of the dimensional orientation angle difference that has predetermined relative time delay each other and be scheduled to;
Wherein, described multi-module optical fiber coupler comprises a plurality of output terminals in the same plane, wherein each output terminal is connected to the light output component of described multi-module optical fiber coupler by multimode optical fiber, the number of the number of described output terminal and described beam splitting laser pulse is identical, the fiber lengths difference between each output terminal postpones based on described predetermined relative time and determine, the position of each output terminal on described plane determine based on described predetermined dimensional orientation angle difference; And the number of the output terminal of described multi-module optical fiber coupler is an odd number, and the layout of described output terminal makes and do not constitute the center symmetry between any two described output terminals.
2. light beam generator according to claim 1, it is characterized in that, be provided with first lens between described pulsed laser and the described multi-module optical fiber coupler, the source laser pulse of described pulsed laser output enters the input end of described multi-module optical fiber coupler through described first Lens Coupling; Wherein, described first lens are spherical lens, non-spherical lens, cylindrical lens or axicon lens.
3. light beam generator according to claim 2, it is characterized in that, the input end of described multi-module optical fiber coupler is provided with the taper optical fibre light splitting device of many root multimode fibers head welding, and the source laser pulse of described pulsed laser output enters described taper optical fibre light splitting device through described first Lens Coupling.
4. light beam generator according to claim 1 is characterized in that, a plurality of output terminals of described multi-module optical fiber coupler are in upper edge, described plane one circle distribution.
5. according to each described light beam generator in the claim 1 to 4, it is characterized in that the orientation of the fiber end face of described each output terminal is selected to determine based on described predetermined dimensional orientation angle difference.
6. several digital hologram cameras is characterized in that, comprise as each described light beam generator and subsequent optical system in the claim 1 to 5; Wherein, described subsequent optical system comprises second lens and sensor devices, the residing plane of a plurality of output terminals of described multi-module optical fiber coupler and the front focal plane coplane of described second lens, the light-sensitive surface of described sensor devices is positioned at the rear of the back focal plane of described second lens.
7. several digital hologram cameras according to claim 6, it is characterized in that, described subsequent optical system also comprises the 3rd lens that are arranged between described second lens and the described sensor devices, the back focal plane coplane of the front focal plane of described the 3rd lens and described second lens, the light-sensitive surface of described sensor devices are positioned at the place ahead or the rear of the back focal plane of described the 3rd lens.
8. according to claim 6 or 7 described several digital hologram cameras, it is characterized in that described pulsed laser is that pulsewidth is 10
-11To 10
-14The ultrashort pulse width laser device of second, described sensor devices is the Charge Coupled Device (CCD) imageing sensor.
9. according to claim 6 or 7 described several digital hologram cameras, it is characterized in that a plurality of output terminals of described multi-module optical fiber coupler are in upper edge, described plane one circle distribution, and the center of circle of described circumference is positioned on the optical axis of described subsequent optical system.
10. several digital hologram cameras according to claim 9, it is characterized in that the bore D of described second lens and the output terminal of described multi-module optical fiber coupler are to distance R, the numerical aperture angle θ of described multimode optical fiber and the focal distance f of second optical lens of described optical axis
1Between satisfy following relation:
D≥2(R+f
1tgθ)。
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Cited By (2)
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| US9542970B2 (en) | 2015-01-30 | 2017-01-10 | National Central University | Light interference module and holographic storage apparatus |
| TWI581260B (en) * | 2015-01-30 | 2017-05-01 | 國立中央大學 | Light interference module and holographic storage apparatus |
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| CN102436168B (en) * | 2011-09-30 | 2013-10-09 | 深圳大学 | Multi-channel digital holographic imaging system and method |
| CN105164571A (en) * | 2013-05-02 | 2015-12-16 | 埃西勒国际通用光学公司 | Method for providing head mounted optical system |
| TWI627517B (en) | 2017-05-11 | 2018-06-21 | National Taiwan Normal University | Method and apparatus for ultrafast time-resolved digital holography |
| EP3460585B1 (en) * | 2017-09-25 | 2021-07-14 | Imec Vzw | An imaging device for in-line holographic imaging of an object |
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| US9542970B2 (en) | 2015-01-30 | 2017-01-10 | National Central University | Light interference module and holographic storage apparatus |
| TWI581260B (en) * | 2015-01-30 | 2017-05-01 | 國立中央大學 | Light interference module and holographic storage apparatus |
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