CN104777738A - Holographic zoom system for eliminating bad light - Google Patents
Holographic zoom system for eliminating bad light Download PDFInfo
- Publication number
- CN104777738A CN104777738A CN201510180501.7A CN201510180501A CN104777738A CN 104777738 A CN104777738 A CN 104777738A CN 201510180501 A CN201510180501 A CN 201510180501A CN 104777738 A CN104777738 A CN 104777738A
- Authority
- CN
- China
- Prior art keywords
- lens
- liquid lens
- light
- lcos
- solid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 239000007787 solid Substances 0.000 claims abstract description 26
- 230000000694 effects Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 241000219739 Lens Species 0.000 description 35
- 210000000695 crystalline len Anatomy 0.000 description 35
- 238000010586 diagram Methods 0.000 description 5
- 238000001093 holography Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000001105 regulatory effect Effects 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 invention provides a holographic zoom system for eliminating bad light. The system comprises a laser, a filter I, a collimator lens, an LCOS, a solid lens, a filter II, a liquid lens and a receiving screen, wherein the filter I and the collimator lens are used for expanding laser beams emitted by a laser to form collimated plane light; the solid lens is located behind the LCOS; the filter II is located at a focal plane position of the solid lens; the liquid lens is located between a receiving screen and the filter II. The holographic zoom system not only can eliminate bad light in the holographic system, but also can achieve a zoom function.
Description
Technical field
The present invention relates to holography, more particularly, the present invention relates to a kind of holographic zoom technology of the bad light that disappears.
Background technology
In recent years, in order to the demand met dynamically, show in real time, the holography based on spatial light modulator (SLM) is paid close attention to widely.As the one of SLM, liquid crystal on silicon (LCOS) is highly integrated with it, big uncork rate, response time are fast etc., and advantage is more and more applied in display system.But due to the impact of LCOS self dot structure, the viewing effect of reproduction image can be subject to the interference of multi-level diffraction light and multistage reproduction image.In order to eliminate these bad light, there is scholar to propose to load the spherical wave of convergence on hologram, thus multi-level diffraction light and multistage reproduction image are separated; Also scholar is had to propose to use linear phase offset to realize being separated.2009, above-mentioned two kinds of methods combining got up by the scholar of Beijing Institute of Technology, eliminate multi-level diffraction light.In order to eliminate multistage reproduction image, method conventional is at present use 4
fsystem, then in conjunction with the use of diaphragm, can be implemented on receiving screen and only watch one-level reproduction image.Therefore, if bad light all will be eliminated, obtain desirable one-level reproduction image, system will become more complicated.
Summary of the invention
The present invention proposes a kind of holographic zoom system, pancreatic system of the bad light that disappears.As shown in Figure 1, this system comprises laser instrument, 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 for laser instrument to send forms collimation plane light, and solid lens is positioned at after LCOS, and wave filter II is positioned at the focal plane position of solid lens, and liquid lens is between receiving screen and wave filter II.
Accompanying drawing 2 is the principle schematic of this system.When using collimated light to irradiate LCOS, reproduction image is made up of two parts, and a part is the multiorder diffractive picture that hologram diffraction is formed, and another part is the multi-level diffraction light caused by the dot structure of LCOS itself.Wherein
d 1the distance between LCOS and solid lens,
d 2the distance between solid lens and wave filter II,
d 3the distance between multi-level diffraction light and multistage reproduction image,
d 4be the distance between liquid lens and multiorder diffractive picture, the distance of receiving screen and liquid lens is
d 5.In order to eliminate multi-level diffraction light, we use divergent spherical wave to be separated multiorder diffractive picture and multi-level diffraction light.According to the imaging formula of lens, can obtain:
（1）
In formula
rbe the radius of divergent spherical wave, the enlargement ratio of solid lens is
m 1=-
d 2/ (
d 1-
r-d 2).After being loaded with divergent spherical wave, the focal position of multiorder diffractive picture moves backward, and the position of the multi-level diffraction light caused by LCOS dot structure remains unchanged.Therefore, multi-level diffraction light is eliminated after device II after filtering, and multiorder diffractive picture is radiated on receiving screen after liquid lens, and its pass is:
（2）
In formula
fbe the focal length of liquid lens, the enlargement ratio of liquid lens is
m 2=-(
d 5-
f)/
f.Because the aperture of liquid lens is smaller, can limit multiorder diffractive picture, finally we can see desirable reproduction image on receiving screen.Can be obtained by formula (1)-(2):
（3）
The size of reproduction image
hmeet:
（4）
In formula
pthe pel spacing of LCOS, λ be playback light wavelength.As can be seen from formula (3)-(4), when the position of LCOS, solid lens, wave filter II, liquid lens and receiving screen remains unchanged, for given
r, can calculate
fvalue, we can by change
rwith
fregulate the size of reproduction image.Therefore, this system can realize the function of zoom.
Preferably, the phase of divergent spherical wave
smeet:
（5）
K=2 π/λ in formula,
x,
yrepresent respectively point on divergent spherical wave to optical axis in the horizontal direction with the distance on vertical direction.
Preferably, wave filter II is positioned at the focal plane place of solid lens, and the focal length of solid lens equals
d 2.
Preferably, liquid lens is based on the moistening effect principle of electricity, changes its focal length by changing impressed voltage.In order to eliminate multiorder diffractive picture, the aperture of liquid lens
d>=3mm and
d≤ 5mm, accompanying drawing 3 is focal length schematic diagram with change in voltage of liquid lens.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of schematic diagram of holographic zoom system, pancreatic system of the bad light that disappears.
Accompanying drawing 2 is a kind of principle schematic of holographic zoom system, pancreatic system of the bad light that disappears.
Accompanying drawing 3 is the schematic diagram of focal length with change in voltage of liquid lens.
Accompanying drawing 4 is the schematic diagram of size with the change in radius of divergent spherical wave of reproduction image.
Shown by reference numeral in above-mentioned each accompanying drawing is:
1 laser instrument, 2 wave filter I, 3 collimation lenses, 4 LCOS, 5 solid lens, 6 wave filter II, 7 liquid lenss, 8 receiving screens.
Should be appreciated that above-mentioned accompanying drawing just schematically, do not draw in proportion.
Embodiment
The following detailed description of the embodiment of the holographic zoom system, pancreatic system of a kind of bad light that disappears of the present invention's proposition, the present invention is conducted further description.What be necessary to herein means out is; following examples are only described further for the present invention; limiting the scope of the invention can not be interpreted as; this art skilled person makes some nonessential improvement and adjustment according to foregoing invention content to the present invention, still belongs to protection scope of the present invention.
One embodiment of the present of invention are, the green light of laser instrument to be wavelength be 532nm, the pel spacing of LCOS is 8 microns, resolution is 1920 × 1080, the focal length of solid lens is 30cm, and the distance of solid lens and LCOS is 10cm, and wave filter II is positioned at 30cm place after solid lens, it is 40cm with the distance of liquid lens, and the distance of liquid lens and receiving screen is 15cm.Parameter is taken in formula (1)-(3), can obtain:
(6)
(7)
Advanced Diffraction light is eliminated after device after filtering, and when radius one timing of divergent spherical wave, we can obtain reproduction image clearly by the focal length of regulates liquid lens.Therefore, by regulating the radius of divergent spherical wave and the focal length of liquid lens, system can realize the function of zoom.Accompanying drawing 4 be in units of reproduction image when taking radius as 25cm 1 time, the size of reproduction image is along with the schematic diagram of the change in radius of divergent spherical wave.
Claims (6)
1. disappear the holographic zoom system, pancreatic system of bad light, comprising: laser instrument, wave filter I, collimation lens, LCOS, solid lens, wave filter II, liquid lens, receiving screen; Its median filter I, collimation lens form collimation plane light for the laser beam expanding sent by laser instrument, and solid lens is positioned at after LCOS, and wave filter II is positioned at the focal plane position of solid lens, and liquid lens is between receiving screen and wave filter II.
2. the holographic zoom system, pancreatic system of a kind of bad light that disappears according to claim 1, is characterized in that,
d 1the distance between LCOS and solid lens,
d 2the distance between solid lens and wave filter II,
d 3the distance between multi-level diffraction light and multistage reproduction image,
d 4be the distance between liquid lens and multiorder diffractive picture, the distance of receiving screen and liquid lens is
d 5; In order to eliminate multi-level diffraction light, using divergent spherical wave to be separated multiorder diffractive picture and multi-level diffraction light, according to the imaging formula of lens, can obtain:
, wherein
rbe the radius of divergent spherical wave, the enlargement ratio of solid lens is
m 1=-
d 2/ (
d 1+
r-d 2), after being loaded with divergent spherical wave, the focal position of multiorder diffractive picture moves backward, and the position of the multi-level diffraction light caused by LCOS dot structure remains unchanged, therefore, multi-level diffraction light is eliminated after device II after filtering, and multiorder diffractive picture is radiated on receiving screen after liquid lens, and its pass is:
, wherein
fbe the focal length of liquid lens, the enlargement ratio of liquid lens is
m 2=-(
d 5-
f)/
f, because the aperture of liquid lens is smaller, can limit multiorder diffractive picture, finally can see desirable reproduction image on receiving screen, the distance between solid lens and liquid lens can be by
obtain, the size of reproduction image
hfor:
, wherein
pthe pel spacing of LCOS, λ be playback light wavelength.
3. the holographic zoom system, pancreatic system of a kind of bad light that disappears according to claim 1, is characterized in that, when the position of LCOS, solid lens, wave filter II, liquid lens and receiving screen remains unchanged, for given
r, can calculate
fvalue, can by change
rwith
fregulate the size of reproduction image, this system can realize the function of zoom.
4. the holographic zoom system, pancreatic system of a kind of bad light that disappears according to claim 1, is characterized in that, the phase of divergent spherical wave
sfor:
, wherein k=2 π/λ,
x,
yrepresent respectively point on divergent spherical wave to optical axis in the horizontal direction with the distance on vertical direction.
5. the holographic zoom system, pancreatic system of a kind of bad light that disappears according to claim 1, it is characterized in that, wave filter II is positioned at the focal plane place of solid lens, and the focal length of solid lens equals
d 2.
6. the holographic zoom system, pancreatic system of a kind of bad light that disappears according to claim 1, is characterized in that, liquid lens is based on the moistening effect principle of electricity, changes its focal length by changing impressed voltage, in order to eliminate multiorder diffractive picture, and the aperture of liquid lens
d>=3mm and
d≤ 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510180501.7A CN104777738B (en) | 2015-04-17 | 2015-04-17 | A kind of holographic zoom system, pancreatic system for the bad light that disappears |
Publications (2)
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| CN104777738A true CN104777738A (en) | 2015-07-15 |
| CN104777738B CN104777738B (en) | 2017-08-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105159045A (en) * | 2015-08-14 | 2015-12-16 | 四川大学 | Holographic projection system based on adjustable diaphragm |
| CN105204312A (en) * | 2015-10-10 | 2015-12-30 | 四川大学 | Holographic projection system based on digital cylindrical lens |
| CN105204313A (en) * | 2015-08-16 | 2015-12-30 | 四川大学 | Optical zooming system and method based on programmable orthogonal close-contact column lens |
| CN107656431A (en) * | 2017-09-27 | 2018-02-02 | 山西大学 | A kind of holographic zoom system, pancreatic system based on liquid device |
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2015
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| 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 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105159045A (en) * | 2015-08-14 | 2015-12-16 | 四川大学 | Holographic projection system based on adjustable diaphragm |
| CN105159045B (en) * | 2015-08-14 | 2017-08-11 | 四川大学 | A kind of holographic projection system based on adjustable diaphragm |
| CN105204313A (en) * | 2015-08-16 | 2015-12-30 | 四川大学 | Optical zooming system and method based on programmable orthogonal close-contact column lens |
| 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 |
| CN105204312A (en) * | 2015-10-10 | 2015-12-30 | 四川大学 | Holographic projection system based on digital 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 |
| CN107656431A (en) * | 2017-09-27 | 2018-02-02 | 山西大学 | A kind of holographic zoom system, pancreatic system based on liquid device |
| CN107656431B (en) * | 2017-09-27 | 2020-01-03 | 山西大学 | Holographic zoom system based on liquid device |
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| CN104777738B (en) | 2017-08-11 |
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