CN100574461C - In the inner method that forms the three-dimensional colour demonstration of transparent medium - Google Patents
In the inner method that forms the three-dimensional colour demonstration of transparent medium Download PDFInfo
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- CN100574461C CN100574461C CNB2006100530041A CN200610053004A CN100574461C CN 100574461 C CN100574461 C CN 100574461C CN B2006100530041 A CNB2006100530041 A CN B2006100530041A CN 200610053004 A CN200610053004 A CN 200610053004A CN 100574461 C CN100574461 C CN 100574461C
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Abstract
The invention discloses in the inner method that forms the three-dimensional colour demonstration of transparent medium, be that transparent medium with the second nonlinear optic crystallite that contains 1 nanometer to 1000 nanometer serves as to show body, with red, green, the infrared laser of two times of wavelength of blue three primary colors visible light correspondence is to showing that body scans, and, show at the inner three-dimensional colour that forms of transparent medium by computer control sweep speed and laser focus position.Technology of the present invention has the resolution height simply, again and does not have ghost point phenomenon, compares with 3 D stereo color display method in the past have remarkable advantages aspect the composite characteristics such as resolution of the material preparation process of display and display system.
Description
Technical field
The present invention relates to a kind of in the inner method that forms the three-dimensional colour demonstration of transparent medium.
Background technology
For a long time people seeking always a kind of can be in three dimensions the technology of displayed image.TV is that quite ripe plane shows, it utilizes electron beam to scan two dimensional surface fast to excite the principle that produces fluorescence to come displayed image, and the observer can only observe image in certain zone of screen, can not obtain any depth information about image.The 3 D stereo demonstration then is not subjected to the influence of observer position, and the observer can observe for 360 ° around the demonstration body.And the amount of information that three-dimensional display can be expressed is considerably beyond the plane demonstration, and it is the multidate information at any one any one position of angle of represented object immediately.These advantages make three-dimensional stereo display technique be with a wide range of applications in fields such as optical information, medical treatment, national defence, and states such as now American-European and Japan are all competitively developing relevant three-dimensional stereo display technique.
Still there is the researcher to utilize two-dimentional Display Technique performance three-dimensional space at present, is referred to as virtual three-dimensional and shows, developed a kind of flat and stereo Display Technique as recent Toshiba Corp.Its principle mainly is to have utilized the parallax of people's eyes, the different images that utilize left eye and right eye to receive, thus produce three-dimensional sensation.But because it exists the graphical display renewal frequency low, dynamically show problems such as difficult, that graphics resolution is low, can not satisfy the requirement of following stereo display; It is another kind of that dimension display technologies---what holography was then utilized is diffraction of light and interference.It is different from the plane Display Technique, the image that it shows has real volume, yet holographic image technology only is the static three-dimensional reflection of record object, still can not initiatively create stereo-picture, be not suitable for the control of computer, and range of observation is also had bigger restriction.
What the body dimension display technologies showed is real stereo-picture.Early stage software engineering researchers invent the sweep volume demonstration, as FELIX 3D and Perspecta.What FELIX 3D used is a helicoid around rotating shaft, and red, green, blue three look laser act on the same point through same light path by speculum, form an individual pixel.Helicoid high speed rotating and become transparent, the body image vegetarian refreshments that laser scans formation fast then constitutes a width of cloth stereo-picture in the space.Relative FELIX 3D is more simple for the structure of Perspectra, and its surfaces of revolution is a upright projection plane, and rotating speed is greater than 600rpm.When showing the 3-D view of object, generate the profile that hundreds of is opened object by software earlier, the profile that constitutes object is got on the perspective plane that the speed of about 2500 frames of per second projects to high speed rotating, utilize the stereopsis that effect produces object that persists of human eye vision.Perspectra adopt three DLP (digital light processing) chips, control forms the profile image of three kinds of colors of red, green, blue respectively, by the fixing optical system of base and with the motor reflection of the optical relay eyeglass of rotation synchronously, finally be projected to above the screen.
It is too many that Rotation screen blocks the dead band of causing but the sweep volume of FELIX 3D etc. shows, and the stationarity to Rotation screen is had relatively high expectations, any vibrations all can cause the fuzzy of image even be difficult to identification, the research that these shortcomings make the researcher turn to static body to show.
The demonstration body that static body shows does not need the projection screen of high speed rotating to obtain one " volume ", shows that body itself just has certain volume.Certain a bit inspires fluorescence to laser beam irradiation to showing body inside, utilize the effect that persists of human eye vision, just can form a width of cloth three-dimensional image when laser excites the point that shows in the body inner space apace successively, image upgrades just with certain frequency can show dynamic image.
The most important principle that the realization static body shows utilizes two kinds of frequencies, two steps to go up the technology of conversion (TFTS) exactly.TFTS is actually the last transfer process that belongs to excited state absorption.Usually the photolytic activity particle is entrained in the transparent material as the demonstration body, the atom of these doping, molecule or ion can absorb photon under the irradiation of light, transit to excitation state.Utilize the different infrared laser of two bundle wavelength, beam of laser is particle excitated to an intermediate state with application point, and another Shu Jiguang to higher excitation state, sends visible light in the process of decay with particle excitated.The identical laser of also useful two bundle wavelength is as excitaton source, and two photons are absorbed simultaneously in this case, do not have intermediate state.But might on the crosspoint that on the light path of laser is not only two bundle laser, cause fluorescent effect thus.
French inventor Luzy and Dupuis just proposed to utilize the TFTS technology to realize the basic theory that static body shows as far back as 1912.With gas as the research that shows matrix comparatively successful be exploitations such as Kim in 1989 serve as the static said three-dimensional body display of demonstration matrix with rubidium steam.Two bundle low energy diode laser bundles, being respectively red laser and the wavelength that wavelength is 630nm is the near-infrared laser of 780nm, be vertically intersected on the volume that has rubidium steam, at the tiny area that two bundle laser intersect, 5S at first takes place in the rubidium atom under the laser excitation of 780nm
1/2To 5P
3/2Go up conversion, under the effect of 630nm laser 5P takes place then
3/2To 6D
5/2Go up conversion, after excitation state experienced for 244 nanoseconds, send red visible fluorescence.Although the laser as the 630nm of excitaton source is at visible region, excite the time of a luminous point very short, to such an extent as to moving to other shot point fast, laser goes constantly to refresh the 3-D view human eye perceives less than red laser.And just the image flicker phenomenon can not appear when image upgrades with the speed of per second 15 times.
Do not need special container to hold with solid as the display that the static body of matrix shows, excitaton source is also more adopts sightless infrared laser.Brown in 1964 etc. have applied for first based on the three-dimensional display patent of changing on the two-photon (U.S.patent 3,474,248 (1969)).Show that matrix is several crystal of fluoride that contain concentration at 0.05 to 25% trivalent thulium, erbium, holmium ion.Be launched into as the wherein beam of laser of excitaton source and be fan-shaped plan, can move on the Z direction, another Shu Jiguang then can move in X, Y direction, thus since the shape of the volumetric pixel of the constant generation of angle of intersecting also fix.
The static said three-dimensional body Display Technique of people such as Lewis exploitation in 1971 is to utilize the TFTS principle.Show that matrix is the CaF of erbium of having mixed
2Crystal, excitaton source are the infrared lasers that wavelength that two xenon lamps provide is respectively 1540nm and 830nm, and erbium ion sends green glow when being stimulated the back decay.From its apparatus structure, also by showing that body intersects with the first bundle laser again, a moment can inspire two individual pixel to the reverberation of the second bundle laser.
Downing etc. started a kind of dimension display technologies in 1994, had caused global sensation.Show that body is the heavy metal fluoride glass of rare earth of having mixed; Excitaton source is the infrared laser that can buy on three pairs of markets.Show three kinds of different alloys of Downing in order to reach three looks: praseodymium produces ruddiness, and thulium produces blue light, and erbium produces green glow.For a lot of problems that the mixing that solves three kinds of different rare earth elements of energy level causes, adopted the thin layer of 100 μ m to 500 μ m, bonding between the thin layer by the identical optics sticker of refractive index, the rare earth element that the thin layer doping is different.When being about 0.5mol%, the concentration of alloy can obtain the luminous point of maximum brightness.Higher concentration can improve unifrequent conversion of going up, and introduces unnecessary visual lines.Each alloy all will lean on the suitable laser of wavelength to intersect and just can excite.By the scanner and the mirror of the control that uses a computer, luminous point can manifest any point in showing body, thereby constitutes the complex image structure.Picture because removing the back at excitaton source, luminous point just disappears, so must upgrade regularly at once.30Hz can avoid image flicker to the speed of 100Hz.They have successfully carried out utilizing the stereo display of up-conversion fluorescence.
But the static body Display Technique that is based on TFTS needs beam of laser that dopant ion is energized into an intermediate state earlier, restraint laser excitation to more higher leveled excitation state by another again, visible light is sent in electronics decay after stopping the regular hour on this energy level, because it relates to two bundle laser, so it excites the hot spot of changing can not be too little, at least be greater than 100 μ m, otherwise two bundle laser are difficult to overlapping in address scan, make based on the static body display resolution of TFTS very low like this, and, make the luminous intensity of body image element weaken because hot spot is too big.
Utilize the static body display of TFTS principle to have the problem of ghost point in addition.Because laser need pass through certain distance in demonstration body inside when arriving the crosspoint, the doping particle all has been excited to intermediate state on this section light path, if the life-span long enough of intermediate state, to such an extent as to still not decay when exciting next point, and when exciting next putting by chance, the second bundle laser will intersect with the light path of the first bundle laser excitation previous point, at this moment just makes doping particle on the crosspoint generation fluorescence that is excited, and ghost point phenomenon occurs.Static display is had relatively high expectations to the control precision of laser beam position, high resolution requirement volumetric pixel is more small, two bundle laser must intersect at preposition accurately, yet the static body based on the TFTS principle shows owing to will satisfy two bundle laser overlaids, so the body image element can not be too little, otherwise two bundle laser are difficult to intersect, and have so just reduced exploration on display resolution ratio.
Summary of the invention
The purpose of this invention is to provide a kind of technology and have the method that there is not ghost point phenomenon in the resolution height simply, again in the demonstration of the inner formation of transparent medium three-dimensional colour.
Of the present invention in the inner method that forms the three-dimensional colour demonstration of transparent medium, be that transparent medium with the second nonlinear optic crystallite that contains 1 nanometer to 1000 nanometer serves as to show body, with red, green, the infrared laser of two times of wavelength of blue three primary colors visible light correspondence is to showing swept-volume, and, show at the inner three-dimensional colour that forms of transparent medium by computer control sweep speed and light focal position.
Operation principle of the present invention is when with laser (comprise continuously and pulse laser) when shining the transparent medium that contains nanoscale (1 nanometer-1000 nanometer) second nonlinear optic crystallite, can produce square frequency multiplication scattered light that is directly proportional of light intensity and laser intensity near laser spot.Change Wavelength of Laser, the corresponding change of frequency multiplication light wavelength, thus can be implemented in the three-dimensional colour stereo display of transparent medium inside.
Among the present invention, the said second nonlinear optic crystallite that contains 1 nanometer to 1000 nanometer is mineral crystal and the organic crystal with second-order optical nonlinearity.Mineral crystal can be β-BaB
2O
4(BBO), BiBO (BiBO), LiB
3O
5(LBO), KTiOPO
4(KTP), KTiOAsO
4(KTA), KH
2PO
4(KDP), a-HIO
3, LiNbO
3(LN), KNbO
3(KN), LiIO
3, BaTiO
3, Ba2NaNb5015, the mixture of one or more among CsB305 (CBO) and the CsLiB6O10.Organic crystal can be sodium formate (HCOONa), L-phosphoarginine (LAP), and dichloro two thiocarbamides close cadmium (BTTC), and a water dichloro thiosemicarbazides closes cadmium (TSCCC) and two halogens, three acrylic thiocarbamides and closes one or more mixture in the cadmium.
Dimensional constraints is in order to reduce nanocrystal to scattering of light in the 1-1000 nanometer.The too small then luminous efficiency of crystal is low, and the excessive then medium of crystal can become opaque, can not realize 3 D stereo reality.
The present invention utilizes that laser freuqency doubling is nanocrystalline to be entrained in that transparent medium is inner to be formed method that three-dimensional colour shows and compare with the static stereo colour display packing of utilizing the TFTS principle and have following beneficial effect:
1) can pass through the single beam focusing scanning, and need not the space crossed of two light beams, improve the complexity of system greatly, can improve the spatial resolution of display again.
2) transparent medium of a nanocrystalline doping of need, and the elder generation that need not employings such as the Downing glass processing that difference is rear-earth-doped becomes the thin layer of 100 μ m, and the technology complicated and consuming time of a block is got up in the glassy bond of again different ions being mixed with the identical optical bond of refractive index then.
3) utilize the efficient of changing on the fluorescence generally to be lower than 1% with TFTS and compare, utilize the light-light conversion efficiency of frequency-doubling crystal can be up to 50%.
4) response speed based on the optics second nonlinear is a hundreds of femtosecond, therefore can not produce the ghost point phenomenon that causes owing to the long fluorescence lifetime of rare earth ion among the TFTS.
Embodiment
The invention will be further described below by embodiment.
Embodiment 1:
100mmx100mmx1000mm with six mirror polish
3Contain the nanocrystalline transparent borosilicate microcrystalline glass of β-BBO as showing body, with the 900nm that focuses on, the nanosecond laser irradiation of the accent Q of 1082nm and 1224nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Embodiment 2:
100mmx100mmx1000mm with six mirror polish
3Contain the nanocrystalline transpex of KTP as showing body, with the 960nm that focuses on, the nanosecond laser irradiation of the accent Q of 1080nm and 1240nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Embodiment 3:
100mmx100mmx1000mm with six mirror polish
3Contain the nanocrystalline transparent silicate glass-ceramics of LN as showing body, with the 950nm that focuses on, the femtosecond laser irradiation of the locked mode of 1032nm and 1260nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Embodiment 4:
100mmx100mmx1000mm with six mirror polish
3Contain BaTiO
3Nanocrystalline transparent borosilicate microcrystalline glass is as showing body, with the 930nm that focuses on, the nanosecond laser irradiation of the accent Q of 1060nm and 1250nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Embodiment 5:
100mmx100mmx1000mm with six mirror polish
3Contain CsLiB
6O
10Nanocrystalline transpex is as showing body, with the 940nm that focuses on, the nanosecond laser irradiation of the accent Q of 1052nm and 1255nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Embodiment 6:
100mmx100mmx1000mm with six mirror polish
3Contain Ba
2NaNb
5O
15Nanocrystalline transparent silicate glass-ceramics is as showing body, with the 935nm that focuses on, the nanosecond laser irradiation of the accent Q of 1058nm and 1258nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Embodiment 7:
100mmx100mmx1000mm with six mirror polish
3Contain the nanocrystalline transpex of sodium formate as showing body, with the 938nm that focuses on, the nanosecond laser irradiation of the accent Q of 1054nm and 1258nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Embodiment 8:
100mmx100mmx1000mm with six mirror polish
3Contain the nanocrystalline transpex of L-LAP as showing body, with the 900nm that focuses on, the nanosecond laser irradiation of the accent Q of 1082nm and 1224nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Embodiment 9:
100mmx100mmx1000mm with six mirror polish
3Dichloro two thiocarbamides that contain close the nanocrystalline transpex of cadmium (BTTC) as showing body, with the 910nm that focuses on, the nanosecond laser irradiation of the accent Q of 1072nm and 1234nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Embodiment 10:
100mmx100mmx1000mm with six mirror polish
3The water dichloro thiosemicarbazides that contains close the nanocrystalline transpex of cadmium (TSCCC) as showing body, with the 906nm that focuses on, the nanosecond laser irradiation of the accent Q of 1082nm and 1225nm, near the focus of laser focusing, produced orchid respectively, green, red luminous (frequency multiplication scattered light) by the computer control scanning system, formed the colored demonstration of stereoscopic three-dimensional in glass inside.
Above embodiment and experiment showed, that the present invention serves as to show body with the transparent medium that contains nanoscale (1 nanometer to 1000 nanometer) second nonlinear optic characteristic crystallite.The computer control of the laser by adopting three kinds of different wave lengths (respectively corresponding red, green, two times wavelength of blue three primary colors) scans fast, can realize that 3 D stereo is colored to show.Compare with 3 D stereo color display method in the past and to have remarkable advantages aspect the composite characteristics such as resolution of the material preparation process of display and display system.
Claims (4)
1. in the inner method that forms the three-dimensional colour demonstration of transparent medium, it is characterized in that the transparent medium with the second nonlinear optic crystallite that contains 1 nanometer to 1000 nanometer serves as to show body, with red, green, the infrared laser of two times of wavelength of blue three primary colors visible light correspondence is to showing that body scans, and, show at the inner three-dimensional colour that forms of transparent medium by computer control sweep speed and laser focus position.
2. method according to claim 1 is characterized in that the said second nonlinear optic crystallite that contains 1 nanometer to 1000 nanometer is mineral crystal or the organic crystal with second-order optical nonlinearity.
3. method according to claim 2 is characterized in that said mineral crystal is β-BaB
2O
4, BiBO
3, LiB
3O
5, KTiOPO
4, KTiOAsO
4, KH
2PO
4, a-HIO
3, LiNbO
3, KNbO
3, LiIO
3, BaTiO
3, Ba
2NaNb
5O
15, CsB
3O
5And CsLiB
6O
10In one or more mixture.
4. method according to claim 2 is characterized in that said organic crystal is a sodium formate, the L-phosphoarginine, and dichloro two thiocarbamides close cadmium, and a water dichloro thiosemicarbazides closes cadmium and two halogens, three acrylic thiocarbamides and closes one or more mixture in the cadmium.
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| CN100574461C true CN100574461C (en) | 2009-12-23 |
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| CN115895659A (en) * | 2021-09-23 | 2023-04-04 | 南京工业大学 | Tailing-free up-conversion three-dimensional display modeling object with power density dependency |
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Non-Patent Citations (4)
| Title |
|---|
| Three-Dimensional High-Resolution Second-HarmonicGeneration Imaging of Engogenous Structural Proteins inBilogica Tissues. PaulJ.Campagnola,Andrew C.Millard,Mark Terasaki,PamelaE.Hoppe,Christian J.Malone,William A.Mohler.Biophysical Journal,Vol.81 . 2002 |
| Three-Dimensional High-Resolution Second-HarmonicGeneration Imaging of Engogenous Structural Proteins inBilogica Tissues. PaulJ.Campagnola,Andrew C.Millard,Mark Terasaki,PamelaE.Hoppe,Christian J.Malone,William A.Mohler.Biophysical Journal,Vol.81 . 2002 * |
| 周期极化KTP晶体532 nm倍频连续绿光输出. 桑梅，于建，倪文俊，薛挺，李世忱，胡永岚，黄朝恩，师瑞.光电子·激光，第14卷第6期. 2003 |
| 周期极化KTP晶体532 nm倍频连续绿光输出. 桑梅，于建，倪文俊，薛挺，李世忱，胡永岚，黄朝恩，师瑞.光电子·激光，第14卷第6期. 2003 * |
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