CN105301790B - The optical system and its illumination angle of divergence adjusting method of central bright spot can be eliminated - Google Patents
The optical system and its illumination angle of divergence adjusting method of central bright spot can be eliminated Download PDFInfo
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- CN105301790B CN105301790B CN201510678120.1A CN201510678120A CN105301790B CN 105301790 B CN105301790 B CN 105301790B CN 201510678120 A CN201510678120 A CN 201510678120A CN 105301790 B CN105301790 B CN 105301790B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 151
- 238000005286 illumination Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title description 10
- 238000003384 imaging method Methods 0.000 claims abstract description 40
- 238000013461 design Methods 0.000 claims abstract description 29
- 230000005855 radiation Effects 0.000 claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 238000009826 distribution Methods 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000009738 saturating Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4233—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
Abstract
The invention discloses a kind of optical systems for eliminating central bright spot, spread out optical texture, collimated light radiation source and a zoom lens structure including a folding, the optical texture that spreads out of rolling over includes virtual image design diffraction optical element and imaging len, and the central cross-section for rolling over the optical texture that spreads out is the main cross section of imaging len；The optical texture that spreads out of rolling over is positioned between collimated light radiation source and zoom lens structure, for realizing the optical field distribution needed for optical system；The virtual image design diffraction optical element is located between collimation source of parallel light and imaging len.The present invention coordinates zoom lens structure using the optical texture that spreads out is rolled over, collimated light radiation source is fixed with virtual image design diffraction optical element position, the illumination angle of divergence that required light field can be realized by adjusting zoom lens structure is adjusted, while thoroughly eliminating the influence of Zero-order diffractive central bright spot.And optical texture refines, the adjusting of the illumination angle of divergence is simple and convenient, optical efficiency is high, size is miniaturized, is of low cost, easy to operate.
Description
Technical field
The invention belongs to optical field more particularly to a kind of optical systems for eliminating central bright spot and its illumination angle of divergence
Adjusting method.
Background technology
In modern technologies, as optoelectronic device, systematic difference develop, each photovoltaic field is to the different of the adjustable angle of divergence
The application of shape laser light field is more and more extensive, and the requirement of abnormity laser light field adjustable to the angle of divergence is also continuously improved, and is based on
The development of diffraction optics and laser technology, it is already possible to realize that the special-shaped laser light field of the fixed angle of divergence, such as rifle take aim at light field, circle
The laser tools light fields such as ring light field, grid light field, but if realizing the adjusting of the special-shaped light field angle of divergence, existing optical articles are all
The change multiple telescopic system for needing cooperation complicated, optical system is complicated, and size is very big, and cost is very high, and adjusts complexity, needs
Movement, the joint debugging for wanting multi-disc lens, cannot be satisfied the needs of many application fields.
As shown in Figure 1, the optical texture of customization light field zoom system, pancreatic system used in the market is extremely complex, first using photograph
A mask plate is irradiated in Mingguang City source, is designed by the transmission region of mask plate, realizes the distributed areas of special-shaped light field, then uses into
Picture system carries out far field imaging to mask plate, and far field imaging passes through varifocal optical system, realizes the hair of final output light field again
Angle is dissipated to adjust.
Varifocal optical system at least needs 3 lens that could realize, the adjustment process of the varifocal optical system as shown in Figure 1
In, it needs respectively to two panels lens（Lens 4 and lens 5）It is had any different and nonlinear position is adjusted, make zoom system, pancreatic system
It is very high to adjust Design of Mechanical Structure complexity, build-up tolerance requires very strict, and it is very big to ultimately cause a whole set of optical system size,
It is complicated for operation and expensive, numerous integrated, inexpensive application fields can not be suitble to.Simultaneously because mask plate is logical
It crosses the mode blocked and realizes special-shaped optical field distribution, light utilization ratio is very low, and heat dissipation capacity is big, also limits the application neck of the product
Domain.
Optical texture work of spreading out can not be rolled over unification with lens system, realize the special-shaped light field angle of divergence currently on the market
Adjustable method, design or device, the present invention are based on the optical characteristics for rolling over the optical texture that spreads out, in conjunction with imaging optical system
Special designing, only use lighting source, folding spreads out optical texture and varifocal optical system, you can realize complexity shown in FIG. 1
The function of optical system.
The zoom system, pancreatic system of traditional special-shaped light field designs, and is the spatial light modulator that special-shaped light field is irradiated by an area source
（Such as mask piece, liquid crystal display）, which is the method by blocking, and is modulated to incident field, the spatial light tune
Device processed by an imaging system, realizes the output of special-shaped light field, optical element complexity, the quantity of the design method are more, light again
Under utilization ratio is very low.Such as widely applied measurement, the special-shaped light field of calibration（Such as stripe abnormity light field, grid
Type abnormity light field etc.）, since the full width area coverage of the abnormity light field is big, but light-emitting zone area is small, and light utilization ratio is general
All over less than 50%, even lower than 10%.The special-shaped light field producing method of traditional spatial light modulator simultaneously, optical device size
Greatly, cost is very high, and very high to application environmental requirement, and the fine dust of surface optical device can all cause the tight of special-shaped light field
Weight defect, above-mentioned factor are that the use of the product causes many unfavorable factors, the serious market application for limiting product.
Diffraction optical element is to realize the intensity Distribution Design of optical output field by the wavefront modification to incident field,
The generation principle of special-shaped light field has essential distinction with spatial light modulator, may replace tradition side using a piece of diffraction optical element
Spatial light modulator in method and imaging lens device, optical element is few, size is small, and light utilization ratio can reach 90% or more.
But if only using design of diffractive optical element abnormity light field, zero level caused by diffraction optical element can not be eliminated
The central bright spot of diffraction, for some special application fields, which brings the application of special-shaped light field unfavorable shadow
It rings.
Invention content
For the present invention in order to solve above-mentioned defect existing in the prior art and deficiency, diffraction optics can be eliminated by providing one kind
The central bright spot of Zero-order diffractive caused by element, and optical texture refining, the illumination angle of divergence adjust simple and convenient, optical efficiency
High, size micromation, of low cost, easy-operating optical system and its illumination angle of divergence adjusting method.
Technical scheme of the present invention：A kind of optical system for eliminating central bright spot, including a folding spread out optical texture, collimation
Light radiation source and a zoom lens structure, the optical texture that spreads out of rolling over includes that virtual image design diffraction optical element and imaging are saturating
Mirror, the central cross-section for rolling over the optical texture that spreads out is the main cross section of imaging len；
The optical texture that spreads out of rolling over is positioned between collimated light radiation source and zoom lens structure, for realizing optical system
Optical field distribution needed for system；The virtual image design diffraction optical element is located between collimation source of parallel light and imaging len.
Preferably, the virtual image design diffraction optical element is fresnel diffraction optical element.
Preferably, the virtual image design diffraction optical element is Fraunhofer diffraction optical element.
Preferably, the collimated light radiation source is source of parallel light, and light field wavefront is plane wave or almost plane wave or warp
Cross lens arrangement processing is in plane wave propagation.
Preferably, the collimated light radiation source is diverging light radiation source, and light field wavefront is spherical wave or passes through lens
The spherical wave of pattern handling is propagated.
Preferably, the lens arrangement is single element lens or compound lens.
The folding optical texture that spreads out is placed on by a kind of illumination angle of divergence regulative mode of optical system that eliminating central bright spot
Between collimated light radiation source and zoom lens structure, the projection of special-shaped light field is realized by adjusting zoom lens structure, to
Realize accurate, the simple adjustment of the light field angle of divergence.
The diffraction optical element that the present invention is designed by the virtual image coordinates imaging len, realizes that a folding spreads out optical texture, in reality
While existing abnormity light field, Zero-order diffractive central bright spot is thoroughly eliminated.
The virtual image in the present invention designs diffraction optical element, is to use needs for optical system, designs original light field
Distribution, the design function of the original optical field distribution are to be equivalent to be located at the imaginary space, the shiner of the imaginary space there are one luminous object
The light field of body propagates to the real space by diffraction optical element.
Diffraction optical element and imaging len that the present invention is designed using virtual image mode in conjunction with folding spread out optical texture and adjust
The illumination angle of divergence for saving optical system places zoom lens structure after folding spreads out optical texture, adjusts the position for rolling over the optical element that spreads out
It sets, is adjusted with zoom lens respective outer side edges, realize the adjustable optical system of the special-shaped light field angle of divergence；The folding spread out optical texture cooperation
Zoom lens structure, collimated light radiation source is fixed with virtual image design diffraction optical element position, by adjusting zoom lens knot
The illumination angle of divergence that required light field can be realized in structure is adjusted, while thoroughly eliminating the influence of Zero-order diffractive central bright spot.And
Optical texture refining, the adjusting of the illumination angle of divergence is simple and convenient, optical efficiency is high, size is miniaturized, is of low cost, easy to operate.
The adjustable angle of divergence light field system that the microstructure of the present invention is realized is being in active demand on the market at present
State.
Description of the drawings
Fig. 1 is used light field Zoom System Optics structural schematic diagram in the market；
Fig. 2 is the functional schematic that the virtual image designs diffraction optical element in the present invention；
Fig. 3 is imaginary space image objects in the present invention to real space optical design schematic diagram；
Fig. 4 is the optical texture schematic diagram of the present invention；
Fig. 5 is the optical texture schematic diagram in the embodiment of the present invention 1；
Fig. 6 is the optical texture schematic diagram in the embodiment of the present invention 2；
Fig. 7 is the optical texture schematic diagram in the embodiment of the present invention 3.
1. radiation source in Fig. 1,2. form the spatial light modulator of required light field, and 3. imaging lens, 4,5,6 is saturating for zoom
Mirror structure.
1. incident beams in Fig. 2 and 3,2. diffraction optical elements, 3. optical output fields, 4. imaginary space objects, 5. real space light
, 6. imaging lens, the imaging of 7. real spaces.
1. radiation source in Fig. 4-7,2. foldings spread out optical texture, 3,4,5. zoom lens structures, and the 6. foldings optical texture that spreads out is different
Shape light field position, 7. zoom lens structure main cross section positions.
Specific implementation mode
The present invention is described in further detail in the following with reference to the drawings and specific embodiments, but is not to be protected to the present invention
Protect the limitation of range.
As shown in Fig. 2, the function of the virtual image design diffraction optical element of the present invention is：Incident beam is a directional light, is entered
Irradiating light beam, which irradiates diffraction optical element, realizes an optical output field, and the equivalent of the optical output field is in the half side light field in the right side of Fig. 2：
There are the light field of an object emission, the light field of imaginary space object to pass through diffraction optics light at the imaginary space position of diffraction optical element
It learns element and propagates to the real space, form a real space light field, which is identical with left half side optical output field.
Assume that imaginary space object is d at a distance from diffraction optical element simultaneously.
As shown in figure 3, the imaging len that a focal length is f is placed on rear side of the diffraction optical element of virtual image design, it can will be empty
The image objects in space can pass through monolithic positive lens in the real space, the imaginary space object realized by design of diffractive optical element
It is imaged to the real space.In Fig. 3, the distance of imaginary space object to diffraction optical element is d1, diffraction optical element to lens away from
From for d2,（d1+d2）For the object distance u in lens imaging system, the image distances of lens to the real space is from being lens imaging system for d3, d3
Image distance v, u, v, f three of system meets lens imaging formula：1/u+1/v=1/f.Imaging len by imaginary space image objects extremely
The real space, the while also Zero-order diffractive of diffraction optical element is expanded, while meeting real space design light field and needing,
Thoroughly eliminate the influence of Zero-order diffractive central bright spot.
Embodiment 1
As shown in Figures 4 and 5, radiation source 1 is collimated light radiation source, rolls over the optical texture 2 that spreads out and is spread out by what the virtual image designed
It penetrates optical element with imaging len to coordinate, needs is designed according to system, are irradiated using collimated light radiation source, realize special-shaped light
.Folding in the present invention optical texture 2 that spreads out may be designed as fresnel diffraction optical element or Fraunhofer diffraction optical element, put down
Row light irradiates diffraction optical element, and the light field angle of divergence is θ 0.Folding is spread out, and to be positioned over radiation source 1 saturating with zoom for optical texture 2
Between mirror structure 3, folding spreads out the zoom lens structure main cross section of special-shaped light field position 6 and imaging system that optical texture 2 is realized
Distance is U1 between position 7, and the focal length of imaging lens system is that f is adjusted by imaging optical system, the angle of divergence of output light field
For θ 1.The angle of divergence amplification factor of output light field and the relationship of adjusting position are：β1=θ1/θ0 .The optics that spreads out is rolled in directional light irradiation
The main cross section distance of the special-shaped light field that structure 2 generates to imaging lens structure is U1, and the equivalent focal length of lens arrangement is f1, then should
The angle of divergence enlargement ratio of optical system be 1=θ of β, 1/ θ 0=（U1-f1）/ f1 can change U and f by adjusting zoom-lens system
Numerical value, to realize the change of angle enlargement multiplying power β.
Embodiment 2
As shown in figs. 4 and 6, radiation source 1 is collimated light radiation source, rolls over the optical texture 2 that spreads out and is spread out by what the virtual image designed
It penetrates optical element with imaging len to coordinate, needs is designed according to system, are irradiated using collimated light radiation source, realize special-shaped light
.Folding in the present invention optical texture 2 that spreads out may be designed as fresnel diffraction optical element or Fraunhofer diffraction optical element, put down
Row light irradiates diffraction optical element, and the light field angle of divergence is θ 0.Folding is spread out, and to be positioned over radiation source 1 saturating with zoom for optical texture 2
Between mirror structure 3, folding spreads out the zoom lens structure main cross section 7 of special-shaped light field position 6 and imaging system that optical texture 2 is realized
Between distance be U2, the focal length of imaging lens system is that f is adjusted by imaging optical system, and the angle of divergence of output light field is θ 2.
The angle of divergence amplification factor of output light field and the relationship of adjusting position are：β2=θ2/θ0 .The optical texture 2 that spreads out is rolled in diverging light irradiation
The main cross section distance of the special-shaped light field of generation to imaging lens structure is U2, and the equivalent focal length of lens arrangement is f2, then the optics
The angle of divergence enlargement ratio of system be 2=θ of β, 2/ θ 0=（U2-f2）/ f2 can change the number of U and f by adjusting zoom-lens system
Value, to realize the change of angle enlargement multiplying power β.
Embodiment 3
As illustrated in figures 4 and 7, radiation source 1 is collimated light radiation source, rolls over the optical texture 2 that spreads out and is spread out by what the virtual image designed
It penetrates optical element with imaging len to coordinate, needs is designed according to system, are irradiated using collimated light radiation source, realize special-shaped light
.Folding in the present invention optical texture 2 that spreads out may be designed as fresnel diffraction optical element or Fraunhofer diffraction optical element, put down
Row light irradiates diffraction optical element, and the light field angle of divergence is θ 0.Folding is spread out, and to be positioned over radiation source 1 saturating with zoom for optical texture 2
Between mirror structure 3, folding spreads out the zoom lens main cross section position 7 of special-shaped light field position 6 and imaging system that optical texture 2 is realized
The distance between be U3, the focal length of imaging lens system is that f is adjusted by imaging optical system, and the angle of divergence of output light field is θ
3.The angle of divergence amplification factor of output light field and the relationship of adjusting position are：β3=θ3/θ0 .The optical texture that spreads out is rolled in diverging light irradiation
The main cross section distance of the 2 special-shaped light fields generated to imaging lens structure is U3, and the equivalent focal length of lens arrangement is f3, then the optics
The angle of divergence enlargement ratio of system be 3=θ of β, 3/ θ 0=（U3-f3）/ f3 can change the number of U and f by adjusting zoom-lens system
Value, to realize the change of angle enlargement multiplying power β.
The present invention coordinates imaging len by the diffraction optical element of the virtual image, realizes that a folding spreads out optical texture, different realizing
While shape light field, Zero-order diffractive central bright spot is thoroughly eliminated.
Patent of the present invention is irradiated using collimated light, and the optimization design for the optical texture that spread out by folding coordinates zoom-lens system,
The output of the varifocal adjusting of abnormity light field can be achieved, light utilization ratio reaches 90% or more；It rolls over the optical texture that spreads out and has volume
Feature small, installation is simple, at low cost, can significantly reduce the volume of optical system, reduce the cost of optical articles；Simultaneously
Folding spreads out, and to have an optical index tolerance larger for optical texture, the fine dust in thang-kng region, dirty relative to spatial light modulator
Influence very little to special-shaped light field, the requirement to application environment is relatively low, is suitable for complicated and diversified application environment, fully achieves
The high light utilization ratio of light field, low cost, optical texture design is simple, size is small, high-precision angle of divergence regulating system, greatly
Improve the function and applicability of optical system.
Claims (3)
1. a kind of optical system for eliminating central bright spot, it is characterised in that：It include a folding spread out optical texture, collimated light irradiation
Light source and a zoom lens structure, the optical texture that spreads out of rolling over includes that virtual image design diffraction optical element and imaging len, folding spread out
The central cross-section of optical texture is the main cross section of imaging len；It is described folding spread out optical texture be positioned over collimated light radiation source with
Between zoom lens structure, for realizing the optical field distribution needed for optical system；The virtual image design diffraction optical element is located at
It collimates between source of parallel light and imaging len；
The virtual image design diffraction optical element is fresnel diffraction optical element；Alternatively, the virtual image design diffraction optics member
Part is Fraunhofer diffraction optical element；
The collimated light radiation source is source of parallel light, and light field wavefront is plane wave or almost plane wave or passes through at lens arrangement
Reason is in plane wave propagation.
2. the optical system according to claim 1 for eliminating central bright spot, it is characterised in that：The lens arrangement is single
Piece lens or compound lens.
3. the illumination angle of divergence regulative mode of optical system according to claim 1, it is characterised in that：Folding is spread out optics knot
Structure is placed between collimated light radiation source and zoom lens structure, and the throwing of special-shaped light field is realized by adjusting zoom lens structure
It penetrates, to realize accurate, the simple adjustment of the light field angle of divergence.
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| CN201510678120.1A CN105301790B (en) | 2015-10-20 | 2015-10-20 | The optical system and its illumination angle of divergence adjusting method of central bright spot can be eliminated |
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| CN108563033A (en) * | 2018-03-06 | 2018-09-21 | 江西衍光科技有限公司 | The optical system of animated image is formed using collimated laser light diffraction optical element |
| CN113009705A (en) * | 2019-12-19 | 2021-06-22 | 苏州苏大维格科技集团股份有限公司 | Structured light assembly for eliminating zero-order diffraction influence |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256285A (en) * | 2007-12-28 | 2008-09-03 | 安徽华东光电技术研究所 | Refraction-diffraction mixed optical system as well as helmet display using the same |
| CN101320216A (en) * | 2008-06-18 | 2008-12-10 | 上海微电子装备有限公司 | Reshaping structure of micro-photoetching illumination iris |
| CN201673310U (en) * | 2010-05-04 | 2010-12-15 | 鄢雨 | Device for producing laser rays with uniform angle distribution |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020071472A1 (en) * | 1999-04-30 | 2002-06-13 | Metrologic Instruments, Inc. | DOE-based systems and devices for producing laser beams having modified beam characteristics |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256285A (en) * | 2007-12-28 | 2008-09-03 | 安徽华东光电技术研究所 | Refraction-diffraction mixed optical system as well as helmet display using the same |
| CN101320216A (en) * | 2008-06-18 | 2008-12-10 | 上海微电子装备有限公司 | Reshaping structure of micro-photoetching illumination iris |
| CN201673310U (en) * | 2010-05-04 | 2010-12-15 | 鄢雨 | Device for producing laser rays with uniform angle distribution |
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Effective date of registration: 20211028 Address after: 8 / F, building 3, 1156 Gaoqiao Avenue, Gaoqiao street, Tongxiang City, Jiaxing City, Zhejiang Province, 314500 Patentee after: JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Address before: 310023 No. 318 stay Road, Xihu District, Zhejiang, Hangzhou Patentee before: ZHEJIANG University OF SCIENCE AND TECHNOLOGY Patentee before: JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY Co.,Ltd. |