CN104777738B - A kind of holographic zoom system, pancreatic system for the bad light that disappears - Google Patents
A kind of holographic zoom system, pancreatic system for the bad light that disappears Download PDFInfo
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- CN104777738B CN104777738B CN201510180501.7A CN201510180501A CN104777738B CN 104777738 B CN104777738 B CN 104777738B CN 201510180501 A CN201510180501 A CN 201510180501A CN 104777738 B CN104777738 B CN 104777738B
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- lens
- solid
- wave filter
- lcos
- light
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- 239000007788 liquid Substances 0.000 claims abstract description 30
- 239000007787 solid Substances 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000001093 holography Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2202—Reconstruction geometries or arrangements
- G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
- G03H2001/2207—Spatial filter, e.g. for suppressing higher diffraction orders
Landscapes
- Holo Graphy (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
The present invention proposes a kind of holographic zoom system, pancreatic system for the bad light that disappears.The system includes laser, wave filter I, collimation lens, LCOS, solid lens, wave filter II, liquid lens, receiving screen.Its median filter I, collimation lens are used for the laser beam expanding formation collimation plane light for sending laser, and solid lens are located at behind LCOS, and wave filter II is located at the focal plane position of solid lens, and liquid lens is located between receiving screen and wave filter II.The system can not only eliminate the bad light in holophotal system, and can realize the function of zoom.
Description
Technical field
The present invention relates to holography, it is more particularly related to a kind of holographic zoom skill for the bad light that disappears
Art.
Background technology
In recent years, for the demand for meeting dynamic, showing in real time, based on spatial light modulator（SLM）Holographic show skill
Art is widely paid close attention to.It is used as SLM one kind, liquid crystal on silicon（LCOS）It is fast with its highly integrated, big opening rate, response time
More and more it is applied to etc. advantage in display system.However, due to the influence of LCOS itself dot structures, the sight of reproduction image
See that effect can be disturbed by multi-level diffraction light and multistage reproduction image.In order to eliminate these bad light, there is scholar to propose in holography
The spherical wave of convergence is loaded on figure, so that multi-level diffraction light and multistage reproduction image be separated；Some scholars propose to use linearly
Phase offset realizes separation.2009, the scholar of Beijing Institute of Technology combined above two method, eliminates multistage
Diffraction light.In order to eliminate multistage reproduction image, conventional method is to use 4 at presentfSystem, in conjunction with the use of diaphragm, Ke Yishi
One-level reproduction image is only watched on present receiving screen.Therefore, if bad light all eliminated, obtain preferable one-level and reproduce
Picture, system will become more complicated.
The content of the invention
The present invention proposes a kind of holographic zoom system, pancreatic system for the bad light that disappears.As shown in Figure 1, the system includes laser, filter
Ripple device I, collimation lens, LCOS, solid lens, wave filter II, liquid lens, receiving screen.Its median filter I, collimation lens are used
In the laser beam expanding formation collimation plane light for sending laser, solid lens are located at behind LCOS, and wave filter II is located at solid
The focal plane position of body lens, liquid lens is located between receiving screen and wave filter II.
Accompanying drawing 2 is the principle schematic of the system.When using collimation light irradiation LCOS, reproduction image is made up of two parts,
A part is the multiorder diffractive picture of hologram diffraction formation, and another part is that the multistage as caused by LCOS dot structures in itself is spread out
Penetrate light.Whereind 1It is the distance between LCOS and solid lens,d 2It is the distance between solid lens and wave filter II,d 3It is many
The distance between order diffraction light and multistage reproduction image,d 4It is the distance between liquid lens and multiorder diffractive picture, receiving screen and liquid
The distance of body lens isd 5.In order to eliminate multi-level diffraction light, we separate multiorder diffractive picture and multistage using divergent spherical wave
Diffraction light.According to the imaging formula of lens, it can obtain：
（1）
In formularIt is the radius of divergent spherical wave, the enlargement ratio of solid lens isM 1=-d 2/(d 1-r-d 2).It is loaded with hair
Dissipate after spherical wave, the focal position of multiorder diffractive picture is moved back by, and the position of the multi-level diffraction light as caused by LCOS dot structures
Put holding constant.Therefore, multi-level diffraction light is eliminated after device II after filtering, and multiorder diffractive picture is radiated at after liquid lens
On receiving screen, its relation is：
（2）
In formulafIt is the focal length of liquid lens, the enlargement ratio of liquid lens isM 2=-(d 5-f)/f.Due to liquid lens
Aperture is smaller, can limit multiorder diffractive picture, and final we can see preferable reproduction image on receiving screen.By formula
（1）-（2）It can obtain：
（3）
The size of reproduction imageHMeet：
（4）
In formulapIt is LCOS pel spacing, λ is the wavelength for reproducing light.From formula（3）-（4）As can be seen that when LCOS,
When solid lens, wave filter II, the position of liquid lens and receiving screen keep constant, for givenr, can calculatef's
Value, we can be by changingrWithfTo adjust the size of reproduction image.Therefore, the system can realize the function of zoom.
Preferably, the phase of divergent spherical wavesMeet：
（5）
K=2 π/λ in formula,x, yRespectively represent divergent spherical wave on point to optical axis in the horizontal direction with vertical direction
Distance.
Preferably, wave filter II is located at the focal plane of solid lens, and the focal length of solid lens is equal tod 2。
Preferably, liquid lens is to be based on electricity moisten effect principle, changes its focal length by changing applied voltage.For
Elimination multiorder diffractive picture, the aperture of liquid lensd>=3mm andd≤ 5mm, accompanying drawing 3 is the focal length of liquid lens with voltage change
Schematic diagram.
Brief description of the drawings
Accompanying drawing 1 is a kind of schematic diagram of the holographic zoom system, pancreatic system for the bad light that disappears.
Accompanying drawing 2 is a kind of principle schematic of the holographic zoom system, pancreatic system for the bad light that disappears.
Accompanying drawing 3 is the focal length of liquid lens with the schematic diagram of voltage change.
Accompanying drawing 4 is the size of reproduction image with the schematic diagram of the radius change of divergent spherical wave.
Shown by reference numeral in above-mentioned each accompanying drawing is：
1 laser, 2 wave filter I, 3 collimation lenses, 4 LCOS, 5 solid lens, 6 wave filter II, 7 liquid lens, 8 are received
Screen.
It should be appreciated that above-mentioned accompanying drawing is schematical, it is not drawn to draw.
Embodiment
The following detailed description of a kind of embodiment of the holographic zoom system, pancreatic system for the bad light that disappears proposed by the present invention, the present invention is entered
Row further description.It is necessarily pointed out that, following examples are served only for the present invention and are described further, it is impossible to manage
Solve as limiting the scope of the invention, art skilled person makes according to foregoing invention content to the present invention
Nonessential modifications and adaptations, still fall within protection scope of the present invention.
One embodiment of the present of invention is that laser is the green light that wavelength is 532nm, and LCOS pel spacing is
8 microns, resolution ratio is 1920 × 1080, and the focal lengths of solid lens is 30cm, and solid lens and LCOS distance are 10cm, filtering
Device II is located at 30cm after solid lens and located, and the distance of it and liquid lens is 40cm, and the distance of liquid lens and receiving screen is
15cm.Take parameter to formula（1）-（3）In, it can obtain：
(6)
(7)
Advanced Diffraction light is eliminated after device after filtering, when the timing of radius one of divergent spherical wave, and we, which can pass through, adjusts
The focal length of section liquid lens obtains clearly reproduction image.Therefore, by adjusting the radius of divergent spherical wave and Jiao of liquid lens
Away from system can realize the function of zoom.When reproduction image when accompanying drawing 4 is using radius as 25cm is unit 1, the size of reproduction image
With the schematic diagram of the radius change of divergent spherical wave.
Claims (3)
1. a kind of holographic zoom system, pancreatic system for the bad light that disappears, including：Laser, wave filter I, collimation lens, LCOS, solid lens,
Wave filter II, liquid lens, receiving screen；The laser beam expanding that its median filter I, collimation lens are used to send in laser forms standard
Straight planar light, solid lens are located at behind LCOS, and wave filter II is located at the focal plane position of solid lens, and liquid lens is located at
Between receiving screen and wave filter II, d1It is the distance between LCOS and solid lens, d2It is between solid lens and wave filter II
Distance, d3It is the distance between multi-level diffraction light and multistage reproduction image, d4The distance between be liquid lens with multiorder diffractive picture,
The distance of receiving screen and liquid lens is d5；In order to eliminate multi-level diffraction light, multiorder diffractive picture is separated using divergent spherical wave
And multi-level diffraction light, according to the imaging formula of lens, it can obtain：Wherein r is divergent spherical wave
Radius, the enlargement ratios of solid lens is M1=-d2/(d1+r-d2), be loaded with after divergent spherical wave, multiorder diffractive as
Focal position is moved back by, and the position of the multi-level diffraction light as caused by LCOS dot structures keeps constant, therefore, multi-level diffraction light
It is eliminated after filtering after device II, multiorder diffractive picture is radiated on receiving screen after liquid lens, its relation is：Wherein f is the focal length of liquid lens, and the enlargement ratio of liquid lens is M2=-(d5- f)/f, because liquid is saturating
The aperture of mirror is smaller, can limit multiorder diffractive picture, and preferable reproduction image, solid lens may finally be seen on receiving screen
Can be by with the distance between liquid lensObtain, the size H of reproduction image is：Wherein p is LCOS pel spacing, and λ is the wavelength for reproducing light.
2. the holographic zoom system, pancreatic system of a kind of bad light that disappears according to claim 1, it is characterised in that when LCOS, solid are saturating
When mirror, wave filter II, the position of liquid lens and receiving screen keep constant, for given r, f value is calculated, passes through and changes
R and f adjusts the size of reproduction image, and the system can realize the function of zoom.
3. the holographic zoom system, pancreatic system of a kind of bad light that disappears according to claim 1, it is characterised in that wave filter II is located at solid
The focal plane of body lens, the focal length of solid lens is equal to d2。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510180501.7A CN104777738B (en) | 2015-04-17 | 2015-04-17 | A kind of holographic zoom system, pancreatic system for the bad light that disappears |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510180501.7A CN104777738B (en) | 2015-04-17 | 2015-04-17 | A kind of holographic zoom system, pancreatic system for the bad light that disappears |
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| CN104777738A CN104777738A (en) | 2015-07-15 |
| CN104777738B true CN104777738B (en) | 2017-08-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105159045B (en) * | 2015-08-14 | 2017-08-11 | 四川大学 | A kind of holographic projection system based on adjustable diaphragm |
| CN105204313B (en) * | 2015-08-16 | 2018-07-17 | 四川大学 | A kind of optical focal distance setting system and Zooming method based on programmable orthogonal contiguity cylindrical lens |
| CN105204312B (en) * | 2015-10-10 | 2018-05-08 | 四川大学 | A kind of holographic projection system based on digital cylindrical lens |
| CN107656431B (en) * | 2017-09-27 | 2020-01-03 | 山西大学 | Holographic zoom system based on liquid device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149698A (en) * | 2013-03-08 | 2013-06-12 | 安徽大学 | Active optical zoom system based on silica-based liquid crystal and zoom method thereof |
| CN203365108U (en) * | 2013-07-08 | 2013-12-25 | 内蒙古工业大学 | Common-path interference measurement device for generated optical aberration of liquid-crystal spatial light modulator |
| CN103518161A (en) * | 2011-04-28 | 2014-01-15 | 大日本印刷株式会社 | Projection device and projection control device |
| CN104298103A (en) * | 2014-10-28 | 2015-01-21 | 四川大学 | Color computational holography aberration compensation system and method based on varifocus lens |
-
2015
- 2015-04-17 CN CN201510180501.7A patent/CN104777738B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103518161A (en) * | 2011-04-28 | 2014-01-15 | 大日本印刷株式会社 | Projection device and projection control device |
| CN103149698A (en) * | 2013-03-08 | 2013-06-12 | 安徽大学 | Active optical zoom system based on silica-based liquid crystal and zoom method thereof |
| CN203365108U (en) * | 2013-07-08 | 2013-12-25 | 内蒙古工业大学 | Common-path interference measurement device for generated optical aberration of liquid-crystal spatial light modulator |
| CN104298103A (en) * | 2014-10-28 | 2015-01-21 | 四川大学 | Color computational holography aberration compensation system and method based on varifocus lens |
Non-Patent Citations (2)
| Title |
|---|
| 基于数字全息显微术的液体透镜参数测量方法;刘俊江等;《中国激光》;20141130;第41卷(第11期);第1109001-1～1109001-5页 * |
| 电控聚合物分散液晶变焦全息透镜制作;郑继红;《光学学报》;20070630;第27卷(第6期);全文 * |
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