CN101799593A - High-speed electric control holographic crystal diffraction beam splitter, preparation method thereof and beam splitting method realized based on beam splitter - Google Patents
High-speed electric control holographic crystal diffraction beam splitter, preparation method thereof and beam splitting method realized based on beam splitter Download PDFInfo
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- CN101799593A CN101799593A CN 201010154243 CN201010154243A CN101799593A CN 101799593 A CN101799593 A CN 101799593A CN 201010154243 CN201010154243 CN 201010154243 CN 201010154243 A CN201010154243 A CN 201010154243A CN 101799593 A CN101799593 A CN 101799593A
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Abstract
The invention discloses a high-speed electric control holographic crystal diffraction beam splitter, a preparation method thereof and a beam splitting method realized based on the beam splitter and relates to a beam splitter, a preparation method thereof and a beam splitting method and solves the problems that a beam splitting switch cannot be controlled in real time, a beam is split into two beams and the beam splitting response speed is low in the prior art. The beam splitter comprises a paraelectric phase electric control holographic crystal; and a Raman-Nath grating is etched in the crystal. The preparation process of the beam splitter comprises the following steps of: adding direct current electric fields at two ends of the crystal; making two beams of coherent light incident onto the crystal for intersection interference; and forming a stable Raman-Nath grating in the crystal. The beam splitting method realized by using the beam splitter comprises the following steps of: placing the beam splitter in a light path; enabling the splitting light beam to pass through the beam splitter; and adding direct current electric fields at two ends of the crystal when the beam splitting is needed so as to realize the beam splitting. The invention can be applied to the fields of optical interconnect, image processing, optical calculation and the like and can realize high-speed electric control beam splitting.
Description
Technical field
The present invention relates to a kind of beam splitter and preparation method thereof, and a kind of beam-splitting method.
Background technology
At numerous areas such as optical communication, photometry calculation, Flame Image Process, beam splitter is one of basic functions optical element, is widely used.Along with developing rapidly of optical-fiber network and optical information processing system, response speed fast (nanosecond order), the beam splitter that beam splitting is effective, performance is adjustable become inevitable demand, yet existing beam splitter all can not satisfy above all demands.
Traditional optical beam-splitter is to utilize the beam splitting of refraction-reflecting system, has shortcomings such as complex structure, volume are big, can't satisfy system's miniaturization, integrated requirement.
Open day is that March 15, publication number in 2006 are in the application text of CN1746421A, a kind of optical bend and higher diffraction beam splitting method is disclosed, this method relates to a kind of manufacturing process of holographic grating beam splitter and utilizes this beam splitter to carry out the process of beam splitting, but because its material behavior and mechanism thereof, can't realize the real-time control of beam splitting performance, promptly can not realize two states of switch of beam splitter.
Open day is in the application text of CN1318158A for October 17 calendar year 2001, publication number, a kind of electro-holographic optical switch is disclosed, though it can realize the switch control to diffracted beam, because of it is a single diffraction order, therefore is merely able to a branch of incident beam is divided into two bundles; In addition, it must satisfy specific incident angle and can realize beam splitting to incident beam.
Open day is that October 7, publication number in 2009 are in the application text of CN101551542A, a kind of electric control switch type holographic polymer dispersed liquid crystal diffractive beam splitter is provided, though can realize switch control to diffracted beam, but there are following two shortcomings: first, because the electric field response speed (being switching time) of its core material Polymer Dispersed Liquid Crystal can't satisfy the demand at high-speed light networking in the millisecond magnitude; The second, it can only realize two states of switch, and uncontrollable diffraction light intensity and progression, the poor operability of device.
Summary of the invention
The objective of the invention is to solve can not controlling the branch beam switch in real time, light beam can only being divided into two bundle and the slow problems of automatically controlled beam splitting response speed, the beam-splitting method that a kind of high-speed electric control holographic crystal diffraction beam splitter and preparation method thereof is provided and has realized of existing in existing beam splitter and the beam-splitting method based on this beam splitter.
High-speed electric control holographic crystal diffraction beam splitter, it is made of a paraelectric phase electric control holographic crystal, described crystal has two logical light faces, these two logical light faces are all perpendicular to [100] axle of this crystal, and one of them logical light face is as light input end, and another logical light face is as light output end, be carved with grating in the described crystal, the ruling span of this grating satisfies the Raman-Nath diffraction conditions, and the wave vector direction of grating is parallel to [001] axle of this crystal, and the grating face is perpendicular to [100] axle of this crystal.
The preparation method of high-speed electric control holographic crystal diffraction beam splitter, its process is as follows:
Steps A 1, between [001] axial two ends of paraelectric phase electric control holographic crystal applying direct current electric field, and the field intensity of described DC electric field is E
W,
Steps A 2, make two bundle coherent light beams incide the light input end of this crystal, and two bundle coherent light beams are intersected in crystal, the angle between two bundle coherent light beams
θSatisfy the Raman-Nath diffraction conditions;
Form a grating in the steps A 3, paraelectric phase electric control holographic crystal, and the ruling span of this grating satisfies the Raman-Nath diffraction conditions, the wave vector direction of grating is parallel to [001] axle of this crystal; After treating that grating is stable, the paraelectric phase electric control holographic crystal that is carved with this grating of acquisition, i.e. high-speed electric control holographic crystal diffraction beam splitter.
Based on the beam-splitting method that high-speed electric control holographic crystal diffraction beam splitter is realized, its process is as follows:
Step B1, high-speed electric control holographic crystal diffraction beam splitter is positioned in the light path for the treatment of beam splitting, makes the light beam for the treatment of beam splitting incide the light input end of described beam splitter, at this moment, the light output end of this beam splitter is exported a branch of outgoing beam;
Step B2, between [001] axial two ends of described beam splitter extra electric field, the field intensity of this electric field is E
0, and
, then the light output end of described beam splitter is exported the N light beams, and N is the positive integer greater than 2, and the size of N is by E
0Decision.
Good effect of the present invention:
When (1) utilizing high-speed electric control holographic crystal diffraction beam splitter of the present invention that light beam is carried out beam splitting, can realize high-speed electric control beam splitting to light beam, response time to external electric field in its beam splitting performance is the response time of crystal current luminous effect, be nanosecond order, be much better than liquid crystal and mechanical beam splitter, can satisfy the requirement of optical-fiber network the high-speed light device;
(2) diffraction efficiency of beam splitter of the present invention when making alive not is 0, and incident beam is exported along former direction transmission; And when making alive, beam splitter can be realized multistage beam splitting, the output multiple light beams, and diffraction light intensity and beam splitting progression all can be controlled by external voltage.
Description of drawings
Fig. 1 is the synoptic diagram that two coherent lights prepare high-speed electric control holographic crystal diffraction beam splitter; Fig. 2 prepares the synoptic diagram of high-speed electric control holographic crystal diffraction beam splitter for two coherent lights that obtain based on the coherent light generation device; Fig. 3 is under the no extra electric field condition, through the synoptic diagram of the input beam transmission of high-speed electric control holographic crystal diffraction beam splitter output; Fig. 4 is under extra electric field (field intensity is non-vanishing) effect, and high-speed electric control holographic crystal diffraction beam splitter is divided into input beam the synoptic diagram of multi beam output; Fig. 5 to Fig. 7 is the experimental result picture that obtains respectively under three kinds of experiment conditions.
Embodiment
Embodiment one: the high-speed electric control holographic crystal diffraction beam splitter of present embodiment, it is made of a paraelectric phase electric control holographic crystal, described crystal has two logical light faces, these two logical light faces are all perpendicular to [100] axle of this crystal, one of them logical light face is as light input end, another logical light face is as light output end, be carved with grating in the described crystal, the ruling span of this grating satisfies the Raman-Nath diffraction conditions, the wave vector direction of grating is parallel to [001] axle of this crystal, and the grating face is perpendicular to [100] axle of this crystal.
Wherein, described Raman-Nath diffraction conditions, promptly the Q value is less than 1, and wherein the expression formula of Q value is:
Q=2πλL/nΛ
2。Wherein, λ is a lambda1-wavelength, and n is a refractive index, and L is a grating thickness, and Λ is a grating space.
Optical grating diffraction generally comprises Bragg diffraction and Raman-Nath diffraction, distinguishes this two kinds of diffraction with the Q value usually: as Q〉〉 1 the time, the Bragg diffraction appears; When Q＜1, the Raman-Nath diffraction appears.The Bragg diffraction can only be divided into two bundles to incident light, and the Raman-Nath diffraction can be divided into incident light multi beam (greater than two bundles).
In application, because the distinct electrical light property of the paraelectric phase electric control holographic crystal in this beam splitter, its inner grating diffration is subjected to E
0* E
ScControl, wherein E
ScBe the field intensity that light is sold off space charge field, E
0Field intensity for extra electric field.When stablizing because of grating, E
ScDo not change, and E
0Can regulate by control, therefore,, can realize controlling grating diffration, and then control the on off state of described beam splitter by controlling the field intensity of this extra electric field to extra electric field.
This beam splitter is positioned in the light path for the treatment of beam splitting, and make the light beam for the treatment of beam splitting incide the light input end of described beam splitter, extra electric field between [001] axial two ends of paraelectric phase electric control holographic crystal then, an electrode that is electric field links to each other at [001] axial end with this crystal, another electrode of electric field links to each other at [001] axial other end with this crystal, and the field intensity of described electric field is E
0, wherein, extra electric field can be DC electric field or AC field.
When no beam splitting needs, make E
0=0, then this moment, incident beam was directly by beam splitter (promptly only exporting the beam of laser bundle at the light output end of beam splitter), and diffraction (diffraction efficiency is 0) does not take place, and promptly this moment, beam splitter was in off status;
When beam splitting needs, order
, then this moment, the Raman-Nath diffraction can take place in incident light under the effect of external dc or alternating voltage, make the light output end output N bundle laser beam of beam splitter, comprising a branch of outgoing beam and multi-level diffraction light bundle along the incident light direction, N is the positive integer greater than 2, and the size of N is by E
0Decision.Diffraction light intensity and beam splitting progression change with external dc or alternating voltage.Thus, the beam splitter of present embodiment can be adjusted the quantity of beam splitting output beam according to actual needs.Angle approximately equal between the diffracted beam, and at the wavefront homomorphosis at distance grating equidistance place.
In addition, in the beam splitting performance of the beam splitter of present embodiment response time of external electric field is equaled the response time of crystal current luminous effect,, be much better than liquid crystal and mechanical beam splitter, can satisfy the requirement of optical-fiber network the high-speed light device at nanosecond order.
The material of described paraelectric phase electric control holographic crystal can adopt any paraelectric phase electrooptical material that can produce automatically controlled photorefractive effect, comprise organic material or inorganic material, its size requires to decide according to specific product, after the material of having selected it, its refractive index can be determined, can judge according to other conditions whether paraelectric phase electric control holographic crystal can produce automatically controlled Raman-Nath diffraction.
In the present embodiment, the thickness of described grating is the glimmer grid less than 0.5mm, and the thickness direction of grating is [100] direction of principal axis along crystal.Particularly, if described paraelectric phase electric control holographic crystal is of a size of 4.00mm * 2.00mm * 0.48mm, then grating thickness should be less than 0.48mm, and crystal is 4.00mm in [010] axial length, in [001] axial length is 2.00mm, is 0.48mm in [100] axial length.The paraelectric phase potassium tantalate-niobate crystalline lithium of described paraelectric phase electric control holographic crystal by adopting doped with manganese.
Described paraelectric phase electric control holographic crystal is coated with metal electrode respectively at [001] axial two ends, and the actual silver electrode that adopted of metal electrode described in the present embodiment is in order to load electric field.
Embodiment two: in conjunction with Fig. 1 and Fig. 2 present embodiment is described, the preparation method of the high-speed electric control holographic crystal diffraction beam splitter of present embodiment, its process is as follows:
Steps A 1, between [001] axial two ends of paraelectric phase electric control holographic crystal applying direct current electric field (electrode that is DC electric field links to each other at [001] axial end with this crystal, another electrode of DC electric field links to each other at [001] axial other end with this crystal), and the field intensity of described DC electric field is E
W,
Steps A 2, make two bundle coherent light beams incide the light input end of this crystal, and two bundle coherent light beams are intersected in crystal, the angle between two bundle coherent light beams
θSatisfy the Raman-Nath diffraction conditions;
Form a grating in the steps A 3, paraelectric phase electric control holographic crystal, and the ruling span of this grating satisfies the Raman-Nath diffraction conditions, the wave vector direction of grating is parallel to [001] axle of this crystal; After treating that grating is stable, the paraelectric phase electric control holographic crystal that is carved with this grating of acquisition, i.e. high-speed electric control holographic crystal diffraction beam splitter.
Above process can be referring to Fig. 1, and an electrode pad voltage of wherein said DC electric field is V=V
W, and V
WNon-vanishing, another electrode pad ground connection.
Because the distinct electrical light property of paraelectric phase electric control holographic crystal, its inner refractive index grating diffration is subjected to E
0* E
ScControl, wherein E
ScBe the field intensity that light is sold off space charge field, the stable back of grating E
ScNo longer change E
0Be the field intensity of extra electric field, its variation can realize the control to optical grating diffraction.So after grating was stable, the electric control holographic crystal had just become automatically controlled beam splitting element.Wherein extra electric field can be DC electric field or AC field.
In the present invention in order to obtain high order diffraction light output as much as possible, the angle of two bundle coherent lights
θShould satisfy the Raman-Nath diffraction conditions, be generally less than 4 degree, grating thickness is less than 0.5mm.
In the present embodiment, two described in the steps A 2 bundle coherent light beam is based on that a coherent light generation device obtains, and described coherent light produces system and is made up of laser instrument 1, beam splitter 2, first catoptron 3 and second catoptron 4;
Referring to Fig. 2, the two bundle coherent light beams that make described in the steps A 2 incide the light input end of this crystal, and make the detailed process that two bundle coherent light beams intersect in crystal be:
Laser instrument 1 output beam of laser bundle, this laser beam incident is divided into folded light beam and transmitted light beam behind beam splitter 2, folded light beam reflexes to the intracrystalline light input end of paraelectric phase electric control holographic through first catoptron 3, transmitted light beam reflexes to the intracrystalline light input end of paraelectric phase electric control holographic through second catoptron 4, then folded light beam and transmitted light beam intersection interference in this crystal.
Among Fig. 2, an electrode pad voltage of DC electric field is V=V
W, and V
WNon-vanishing, another electrode pad ground connection.The optical maser wavelength of laser instrument 1 output can be 532.0 nanometers.
Embodiment three: the beam-splitting method based on the realization of high-speed electric control holographic crystal diffraction beam splitter of present embodiment, its process is as follows:
Step B1, high-speed electric control holographic crystal diffraction beam splitter is positioned in the light path for the treatment of beam splitting, makes the light beam for the treatment of beam splitting incide the light input end of described beam splitter, at this moment, the light output end of this beam splitter is exported a branch of outgoing beam;
Step B2, between [001] axial two ends of described beam splitter extra electric field, the field intensity of this electric field is E
0, and
, then the light output end of described beam splitter is exported the N light beams, and N is the positive integer greater than 2, and the size of N is by E
0Decision;
Wherein, extra electric field can be DC electric field or AC field among the step B2.
Present embodiment can realize the high-speed electric control beam splitting to incident beam, and its response time to external electric field is the response time of crystal current luminous effect, promptly at nanosecond order, is much better than liquid crystal and mechanical beam splitter, can satisfy the requirement of optical-fiber network to the high-speed light device; And the automatically controlled performance of present embodiment is good, (E when making alive not
0Equal at 0 o'clock), incident light directly passes through, not diffracted beam splitting, promptly beam splitter is an off status; (E when applying electric field
0Be not equal at 0 o'clock), the diffracted beam splitting of incident light, promptly beam splitter is for leaving state.And diffraction light intensity and beam splitting progression, change with external dc or alternating voltage.
Using the present invention can carry out beam splitting to the light beam of the information of carrying, and as image etc., and the present invention has wider range of application, can be applicable to fields such as optics is interconnected, Flame Image Process, photometry calculation.
A specific embodiment is provided below:
In the preparation process of the high-speed electric control holographic crystal diffraction beam splitter of present embodiment, the optical maser wavelength of laser instrument 1 output is 532.0 nanometers, paraelectric phase electric control holographic crystal is selected the paraelectric phase potassium tantalate-niobate crystalline lithium of doped with manganese for use, wherein the volumetric molar concentration of Mn is 0.5%, and crystalline size is 4.00 * 2.00 * 0.48mm
3(cubic millimeter), wherein crystal is 4.00mm in [010] axial length, is 2.00mm in [001] axial length, is 0.48mm in [100] axial length; The intensity of two bundle coherent light beams is 12mW/cm
2(every square centimeter of milliwatt), angle are 1 degree, and the polarization direction of coherent light is in plane of incidence, and its polarization direction is perpendicular to [001] direction of principal axis of potassium tantalate-niobate crystalline lithium, and external voltage is added in crystal [001] direction.After 2 minutes, it is stable that grating reaches by the coherent light beam irradiation for crystal.
Wherein, described " polarization direction of coherent light is in plane of incidence; and its polarization direction is perpendicular to [001] direction of principal axis of potassium tantalate-niobate crystalline lithium; external voltage is added in crystal [001] direction " this condition is in order to obtain best refractive-index grating in the potassium tantalate-niobate crystalline lithium, thereby reaches the optimum condition of Raman-Nath diffraction.
After having prepared beam splitter, the laser beam incident that with wavelength is 532.0 nanometers is to this beam splitter, when not on beam splitter during making alive (voltage V=0), this laser beam is directly passed through beam splitter, not diffracted beam splitting, promptly beam splitter is an off status, the synoptic diagram of this process can be referring to Fig. 3; When on beam splitter, applying the DC voltage of 300V, can see that at the output terminal of beam splitter 10 diffracted beams that corner dimension equates occur, promptly beam splitter is for leaving state, and the synoptic diagram of this process can be referring to Fig. 4, and experimental result can be referring to Fig. 5; When on beam splitter, applying the DC voltage of 220V, can see that at the light output end of beam splitter 6 diffracted beams that corner dimension equates occur, at this moment, also for opening state, the synoptic diagram of this process equally can be referring to Fig. 4 for beam splitter, and experimental result is referring to Fig. 6; Comparison diagram 5 and Fig. 6 can also find that under two kinds of voltage conditions, the intensity of output terminal light beam also has difference.This shows, by changing the power of impressed voltage, intensity and number that can the control output end light beam.
Then, with wavelength is that the laser beam (replace wavelength be the laser beam of 532.0 nanometers) of 632.8 nanometers incides on this beam splitter, and on beam splitter, apply the DC voltage of 300V, at this moment, will see that 8 diffracted signal light that corner dimension equates occur at the light output end of beam splitter, as shown in Figure 7.
Claims (9)
1. high-speed electric control holographic crystal diffraction beam splitter, it is made of a paraelectric phase electric control holographic crystal, described crystal has two logical light faces, these two logical light faces are all perpendicular to [100] axle of this crystal, one of them logical light face is as light input end, another logical light face is as light output end, it is characterized in that: be carved with grating in the described crystal, the ruling span of this grating satisfies the Raman-Nath diffraction conditions, the wave vector direction of grating is parallel to [001] axle of this crystal, and the grating face is perpendicular to [100] axle of this crystal.
2. high-speed electric control holographic crystal diffraction beam splitter according to claim 1, the thickness that it is characterized in that described grating is less than 0.5mm.
3. high-speed electric control holographic crystal diffraction beam splitter according to claim 1 and 2, it is characterized in that described paraelectric phase electric control holographic crystal is of a size of 4.00mm * 2.00mm * 0.48mm, and it is 4.00mm in [010] axial length, in [001] axial length is 2.00mm, in [100] axial length is 0.48mm, and the thickness of grating is less than 0.48mm.
4. high-speed electric control holographic crystal diffraction beam splitter according to claim 1 is characterized in that the paraelectric phase potassium tantalate-niobate crystalline lithium of described paraelectric phase electric control holographic crystal by adopting doped with manganese.
5. high-speed electric control holographic crystal diffraction beam splitter according to claim 1 is characterized in that described paraelectric phase electric control holographic crystal is coated with metal electrode respectively at [001] axial two ends.
6. the preparation method of high-speed electric control holographic crystal diffraction beam splitter is characterized in that its process is as follows:
Steps A 1, between [001] axial two ends of paraelectric phase electric control holographic crystal applying direct current electric field, and the field intensity of described DC electric field is E
W,
Steps A 2, make two bundle coherent light beams incide the light input end of this crystal, and two bundle coherent light beams are intersected in crystal, the angle between two bundle coherent light beams
θSatisfy the Raman-Nath diffraction conditions;
Form a grating in the steps A 3, paraelectric phase electric control holographic crystal, and the ruling span of this grating satisfies the Raman-Nath diffraction conditions, the wave vector direction of grating is parallel to [001] axle of this crystal; After treating that grating is stable, the paraelectric phase electric control holographic crystal that is carved with this grating of acquisition, i.e. high-speed electric control holographic crystal diffraction beam splitter.
7. the preparation method of high-speed electric control holographic crystal diffraction beam splitter according to claim 6 is characterized in that:
Described in the steps A 2 two bundle coherent light beam is based on a coherent light generation device acquisition, and described coherent light produces system and is made up of laser instrument (1), beam splitter (2), first catoptron (3) and second catoptron (4);
The two bundle coherent light beams that make described in the steps A 2 incide the light input end of this crystal, and make the detailed process that two bundle coherent light beams intersect in crystal be:
Laser instrument (1) output beam of laser bundle, this laser beam incident is divided into folded light beam and transmitted light beam behind beam splitter (2), folded light beam reflexes to the intracrystalline light input end of paraelectric phase electric control holographic through first catoptron (3), transmitted light beam reflexes to the intracrystalline light input end of paraelectric phase electric control holographic through second catoptron (4), then folded light beam and transmitted light beam intersection interference in this crystal.
8. the preparation method of high-speed electric control holographic crystal diffraction beam splitter according to claim 6 is characterized in that the optical maser wavelength of laser instrument (1) output is 532.0 nanometers.
9. based on the beam-splitting method of high-speed electric control holographic crystal diffraction beam splitter realization, it is characterized in that its process is as follows:
Step B1, high-speed electric control holographic crystal diffraction beam splitter is positioned in the light path for the treatment of beam splitting, makes the light beam for the treatment of beam splitting incide the light input end of described beam splitter, at this moment, the light output end of this beam splitter is exported a branch of outgoing beam;
Step B2, between [001] axial two ends of described beam splitter extra electric field, the field intensity of this electric field is E
0, and
, then the light output end of described beam splitter is exported the N light beams, and N is the positive integer greater than 2, and the size of N is by E
0Decision.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943805A (en) * | 2010-08-27 | 2011-01-12 | 哈尔滨工业大学 | Manufacturing method of electronically-controlled quadratic electro-optical effect Prague diffraction beam splitter and beam splitting method by using beam splitter |
| CN103869463A (en) * | 2014-04-10 | 2014-06-18 | 哈尔滨工业大学 | Zooming method of electric control holographic varifocal lens and focal position obtaining method |
| CN104076533A (en) * | 2014-07-24 | 2014-10-01 | 哈尔滨工业大学 | Method for improving performance of electrically-controlled diffraction device |
| CN104765154A (en) * | 2015-05-06 | 2015-07-08 | 北京唯创视界科技有限公司 | Device and method for projecting disperse light spots |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318158A (en) * | 1998-07-06 | 2001-10-17 | 耶路撒冷希伯来大学伊森姆研究发展公司 | Electro-holographic optical switch |
| CN1746721A (en) * | 2005-09-28 | 2006-03-15 | 哈尔滨工业大学 | Optical bend and higher diffraction beam splitting method |
| US20080193073A1 (en) * | 2005-04-07 | 2008-08-14 | Yissum Research Development Company | Electro-Optic Crystal-Based Structures and Method of Their Fabrication |
-
2010
- 2010-04-23 CN CN2010101542432A patent/CN101799593B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318158A (en) * | 1998-07-06 | 2001-10-17 | 耶路撒冷希伯来大学伊森姆研究发展公司 | Electro-holographic optical switch |
| US20080193073A1 (en) * | 2005-04-07 | 2008-08-14 | Yissum Research Development Company | Electro-Optic Crystal-Based Structures and Method of Their Fabrication |
| CN1746721A (en) * | 2005-09-28 | 2006-03-15 | 哈尔滨工业大学 | Optical bend and higher diffraction beam splitting method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943805A (en) * | 2010-08-27 | 2011-01-12 | 哈尔滨工业大学 | Manufacturing method of electronically-controlled quadratic electro-optical effect Prague diffraction beam splitter and beam splitting method by using beam splitter |
| CN103869463A (en) * | 2014-04-10 | 2014-06-18 | 哈尔滨工业大学 | Zooming method of electric control holographic varifocal lens and focal position obtaining method |
| CN104076533A (en) * | 2014-07-24 | 2014-10-01 | 哈尔滨工业大学 | Method for improving performance of electrically-controlled diffraction device |
| CN104765154A (en) * | 2015-05-06 | 2015-07-08 | 北京唯创视界科技有限公司 | Device and method for projecting disperse light spots |
| CN104765154B (en) * | 2015-05-06 | 2017-05-31 | 上海图漾信息科技有限公司 | Apparatus and method for projecting discrete light spot |
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|---|---|
| CN101799593B (en) | 2011-11-09 |
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