CN105511086A - Laser illumination optical system combining diffraction optical element with laser - Google Patents
Laser illumination optical system combining diffraction optical element with laser Download PDFInfo
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- CN105511086A CN105511086A CN201510913079.1A CN201510913079A CN105511086A CN 105511086 A CN105511086 A CN 105511086A CN 201510913079 A CN201510913079 A CN 201510913079A CN 105511086 A CN105511086 A CN 105511086A
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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
- G02B27/09—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
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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
- G02B27/425—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 in illumination systems
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention belongs to the field of photoelectric communication, and especially relates to a laser illumination optical system combining a diffraction optical element with a laser. The laser illumination optical system comprises a laser irradiation light source and the diffraction optical element. After the laser irradiation light source is irradiated on the diffraction optical element, the optical field of the laser irradiation light source is optically modulated by the diffraction optical element, the laser optical field is spread along a specific angle area, and through design and adjustment of optical field wavefront phase modulation, micro morphology and overall dimension of the diffraction optical element, a divergence angle of a needed complex illumination optical field is designed. According to the invention, through diffraction optical design and optical modulation of optical field parameters of the laser irradiation light source are realized through the diffraction optical element, the light intensity utilization rate is high, the distribution shape of the optical field and the light intensity distribution can be flexibly controlled, and the complex illumination optical field can be realized according to needs of such application systems as monitoring shooting, human-eye observation and the like.
Description
Technical field
The invention belongs to photoelectric communication field, particularly relate to a kind of laser lighting optical system adopting diffraction optical element to be combined with laser instrument.
Background technology
The optical design of traditional illumination light field, it is the feature for illuminating source (as LED, laser etc.), by using refraction optical element, as lens, catoptron, microlens array, camera lens, scattering sheet, spatial light modulator (as mask sheet, liquid crystal display etc.), realize the secondary modulation to luminous light field, realize the output of required illumination light field.This traditional design mode be by reflecting, blocking, the method for imaging, incident field is modulated, the optical element of method for designing is complicated, quantity is more, light utilization ratio is very low, and function singleness, cannot realize complicated illumination light field, such as, for applications such as the asymmetric rectification of light distribution of widespread use, more than 1000 meters long distance illuminations, traditional design all cannot realize.Traditional lighting light field design simultaneously, its optical device size is large, cost is very high, very high to application environmental requirement, the fine dust of surface optical device all can cause the major defect of special-shaped light field, above-mentioned factor is that the use of this product causes a lot of disadvantageous factor, the serious market application limiting product.
In modern technologies, along with optoelectronic device, systematic difference develops, the application of each photovoltaic field to the illumination light field of active light source luminescence is more and more extensive, require also to improve constantly, as night-vision monitoring equipment, industrial lighting equipment, ultra-wide angle capture apparatus, the development in the fields such as overlength distance capture apparatus, complexity is proposed to active illumination light field, harsh requirement, its optical system of traditional lamp optical system is complicated, size is very large, cost is very high, and regulate complicated, need the movement of multi-disc lens, uniting and adjustment, and light field control mode is simple, optical field distribution complicated and changeable can not be realized, cannot meet the demand of application, based on the development of diffraction optics and laser technology, provide technical foundation for realizing special lighting laser light field, diffraction optical element is novel optical element just ripe gradually in the recent period, its design concept and traditional dioptrics possess essential distinction, carry out light field modulation design based on the Wave-front phase characteristic of light field, belong to other nanometer micro-optical device of wavelength level, in the light field region of 1 mm size, the light field control module of hundreds of millions magnitudes can be realized, input light field is enriched, regulate flexibly, almost can realize the requirement of the output light field of any complexity, its size is little, powerful, light intensity utilization ratio is high, it is the important application technology of following lighting field.
Summary of the invention
The present invention is in order to solve the defect and deficiency that exist in above-mentioned prior art, provide a kind of light intensity utilization ratio high, shape, the light distribution of optical field distribution can control flexibly, can according to the needs such as monitoring the application systems such as shooting, eye-observation, the laser lighting optical system that the employing diffraction optical element realizing complicated illumination light field is combined with laser instrument.
Technical scheme of the present invention: a kind of laser lighting optical system adopting diffraction optical element to be combined with laser instrument, comprise laser radiation source and diffraction optical element, after laser radiation source irradiates diffraction optical element, the light field of laser radiation source passes through the optical modulation of this diffraction optical element, laser light field is propagated along specific angular regions, by the light field wave-front phase modulation of design modifying diffraction optical element, microscopic appearance and overall dimensions, realize the angle of divergence design of required complicated illumination light field.
Preferably, described laser radiation source is alignment-laser, and its laser light field wavefront is plane wave or almost plane ripple.
Preferably, described laser radiation source is diverging light laser radiation source, and its laser light field wavefront is spherical wave.
Preferably, described laser radiation source and diffraction optical element realize the design of required special-shaped light field, after light source irradiation diffraction optical element, form the light field of the certain light intensity distribution possessing overall optical system and need, the specific angle of divergence.
Preferably, described diffraction optical element is fresnel diffraction optical element or Fraunhofer diffraction optical element.
Preferably, described diffraction optical element possesses the function be adjusted to respectively X and the Y-direction angle of divergence of incident field, the angle of divergence of incident field is carried out Homogenization Treatments, realize the design optimization of the special-shaped light field of required laser lighting, after light source irradiation diffraction optical element, form the light field possessing the specific angle of divergence that overall optical system needs.
Preferably, described diffraction optical element possesses the function be adjusted to respectively the X of incident field and the luminous size of Y-direction, the luminous size of incident field is carried out Homogenization Treatments, realize the design optimization of the special-shaped light field of required laser lighting, after light source irradiation diffraction optical element, form the light field possessing the specific luminous size that overall optical system needs.
Preferably, the Wave-front phase of incident field carries out being adjusted to process by the design that the described diffraction optical element wavefront properties possessed for incident field carries out phase-modulation, realizes the design optimization of the special-shaped light field of required laser lighting.
Diffraction optical element is by the wavefront modification to incident field, realize the intensity Distribution Design of outgoing light field, generation principle and the traditional design of the illumination light field of its arbitrary shape, the angle of divergence have essential distinction, use a slice diffraction optical element can replace the function of the multiple optical devices in classic method, optical element is few, size is little, and light utilization ratio increases substantially, and can reach more than 90%, optical function is very abundant, can meet the demand of illuminated field of arbitrary shape, light distribution.
Diffraction optical element of the present invention, use needs based on illuminator, according to the optical parametric of irradiating laser light source, carry out the design of diffraction optical element targetedly, realize the output of specific laser light field, the illumination light field that this diffraction optical element and laser instrument realize designs, its light intensity utilization ratio is high, shape, the light distribution of optical field distribution can control flexibly, can according to the needs such as monitoring the application systems such as shooting, eye-observation, realizing complicated illumination light field, is the optical system that conventional illumination device cannot realize.
Laser coordinates the laser illumination system of diffraction optical element, is designed, the laser lighting light field can realize any complexity, acquiring a special sense by the combination of laser light field and diffraction optical element.
Diffraction optical element possesses the feature that volume is little, installation is simple, cost is low, significantly can reduce the volume of optical system, reduces the cost of optical articles; Simultaneously to possess optical index tolerance larger for diffraction optical element, relative to Traditional optics, fine dust, the dirty impact on special-shaped light field in its territory, transparent zone are very little, lower to the requirement of applied environment, complicated and diversified applied environment can be adapted to, fully achieve that the high light utilization ratio of light field, low cost, optical texture simplicity of design, size are little, high precision angle of divergence regulating system, improve function and the applicability of optical system greatly.
The present invention is designed and optical modulation the diffraction optics of the light field parameter of laser radiation source by diffraction optical element, make its light intensity utilization ratio high, shape, the light distribution of optical field distribution can control flexibly, according to the needs such as monitoring the application systems such as shooting, eye-observation, complicated illumination light field can be realized.
Accompanying drawing explanation
Fig. 1 is equivalent schematic of the present invention;
Fig. 2 is the equivalent schematic of laser radiation source and diffraction optical element X-direction in the present invention;
Fig. 3 is the equivalent schematic of laser radiation source and diffraction optical element Y-direction in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation, but be not limiting the scope of the invention.
As shown in Figure 1, the function of diffraction optical element is: incident beam is the laser beam of a parallel or divergent shape, incident beam irradiates diffraction optical element and realizes an outgoing light field, this diffraction optical element is the optical characteristics according to incident field, carry out targeted design, regulate the wavefront of incident field, realize the Fourier transform of incident field to required outgoing light field.LASER Light Source and diffraction optical element position are fixed, only by the adjustment of a slice diffraction optical element, the angle of divergence design of required complicated illumination light field can be realized, optical function is powerful, significantly can reduce the size of illuminator simultaneously, reduce the cost of illuminator, extend application and the application mode of laser illumination system.
As shown in Figures 2 and 3, the function 1 of diffraction optical element of the present invention: due to I
θand the impact of dx and dy, the real spherical wave of X and Y-direction converges focus and is not positioned on lasing fluorescence face, but along the intersection point of spherical wave backpropagation, the focus point of its X-direction and Y-direction is fx and fy to the distance of diffraction optical element respectively as shown in the figure.The X-direction of diffraction optical element inside possesses to be compressed (being similar to a focal length is the lens combination of fx) θ x angle, the y direction of diffraction optical element inside possesses to be compressed (being similar to a focal length is the lens combination of fy) θ y angle, divergent beams form the beam divergence angle homogenising of X, Y-direction after the modulation of this diffraction optical element, θ ox and θ oy ratio are about 1:1, for the light field process needs realizing post laser illumination.
The function 2 of the diffraction optical element of patent of the present invention: design has incorporated and designed for the Homogenization Treatments of dx and dy simultaneously, suppose that dx is less than dy, the X-direction of diffraction optical element inside possesses carries out size process (being similar to the lens that is of a size of dx) to dx, the y direction of diffraction optical element inside possesses carries out size process (being similar to the lens that is of a size of dy) to dy, the light beam of laser forms X after the modulation of this diffraction optical element, the beam sizes homogenising of Y-direction, significantly improve the ratio of spot size, for realizing post laser illumination light field needs.
Claims (8)
1. the laser lighting optical system adopting diffraction optical element to be combined with laser instrument, it is characterized in that: it comprises laser radiation source and diffraction optical element, after laser radiation source irradiates diffraction optical element, the light field of laser radiation source passes through the optical modulation of this diffraction optical element, laser light field is propagated along specific angular regions, by the light field wave-front phase modulation of design modifying diffraction optical element, microscopic appearance and overall dimensions, realize the angle of divergence design of required complicated illumination light field.
2. a kind of laser lighting optical system adopting diffraction optical element to be combined with laser instrument according to claim 1, is characterized in that: described laser radiation source is alignment-laser, and its laser light field wavefront is plane wave or almost plane ripple.
3. a kind of laser lighting optical system adopting diffraction optical element to be combined with laser instrument according to claim 1, is characterized in that: described laser radiation source is diverging light laser radiation source, and its laser light field wavefront is spherical wave.
4. a kind of laser lighting optical system adopting diffraction optical element to be combined with laser instrument according to claim 1, it is characterized in that: described laser radiation source and diffraction optical element realize the design of required special-shaped light field, after light source irradiation diffraction optical element, form the light field of the certain light intensity distribution possessing overall optical system and need, the specific angle of divergence.
5. a kind of laser lighting optical system adopting diffraction optical element to be combined with laser instrument according to claim 1, is characterized in that: described diffraction optical element is fresnel diffraction optical element or Fraunhofer diffraction optical element.
6. a kind of laser lighting optical system adopting diffraction optical element to be combined with laser instrument according to claim 1, it is characterized in that: described diffraction optical element possesses the function be adjusted to respectively X and the Y-direction angle of divergence of incident field, the angle of divergence of incident field is carried out Homogenization Treatments, realize the design optimization of the special-shaped light field of required laser lighting, after light source irradiation diffraction optical element, form the light field possessing the specific angle of divergence that overall optical system needs.
7. a kind of laser lighting optical system adopting diffraction optical element to be combined with laser instrument according to claim 1, it is characterized in that: described diffraction optical element possesses the function be adjusted to respectively the X of incident field and the luminous size of Y-direction, the luminous size of incident field is carried out Homogenization Treatments, realize the design optimization of the special-shaped light field of required laser lighting, after light source irradiation diffraction optical element, form the light field possessing the specific luminous size that overall optical system needs.
8. a kind of laser lighting optical system adopting diffraction optical element to be combined with laser instrument according to claim 1, it is characterized in that: the Wave-front phase of incident field carries out being adjusted to process by the design that the described diffraction optical element wavefront properties possessed for incident field carries out phase-modulation, realize the design optimization of the special-shaped light field of required laser lighting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510913079.1A CN105511086A (en) | 2015-12-11 | 2015-12-11 | Laser illumination optical system combining diffraction optical element with laser |
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| CN201510913079.1A CN105511086A (en) | 2015-12-11 | 2015-12-11 | Laser illumination optical system combining diffraction optical element with laser |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272217A (en) * | 2017-08-10 | 2017-10-20 | 深港产学研基地（北京大学香港科技大学深圳研修院） | Intelligent vehicle relevant detection laser radar miniature light sources and preparation method thereof |
| CN107490869A (en) * | 2017-08-24 | 2017-12-19 | 华天科技（昆山）电子有限公司 | Space structure light emitting devices |
| CN108051929A (en) * | 2018-01-09 | 2018-05-18 | 北京驭光科技发展有限公司 | Three-dimensional information detection light field optical system and its method |
| CN108169981A (en) * | 2018-01-15 | 2018-06-15 | 深圳奥比中光科技有限公司 | Multi-functional lighting module |
| 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 |
| CN110207940A (en) * | 2019-06-25 | 2019-09-06 | 中国航天空气动力技术研究院 | A kind of High-speed transient schlieren system applying to large tunnel |
| CN110824721A (en) * | 2019-09-24 | 2020-02-21 | 杭州驭光光电科技有限公司 | Method for designing diffractive optical element and diffractive optical element |
| CN111279675A (en) * | 2017-11-09 | 2020-06-12 | 株式会社电装 | State detection device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272217A (en) * | 2017-08-10 | 2017-10-20 | 深港产学研基地（北京大学香港科技大学深圳研修院） | Intelligent vehicle relevant detection laser radar miniature light sources and preparation method thereof |
| CN107490869A (en) * | 2017-08-24 | 2017-12-19 | 华天科技（昆山）电子有限公司 | Space structure light emitting devices |
| CN107490869B (en) * | 2017-08-24 | 2020-08-28 | 华天科技（昆山）电子有限公司 | Space structure light emitting device |
| CN111279675B (en) * | 2017-11-09 | 2022-03-11 | 株式会社电装 | State detection device |
| CN111279675A (en) * | 2017-11-09 | 2020-06-12 | 株式会社电装 | State detection device |
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| CN108051929A (en) * | 2018-01-09 | 2018-05-18 | 北京驭光科技发展有限公司 | Three-dimensional information detection light field optical system and its method |
| CN108169981A (en) * | 2018-01-15 | 2018-06-15 | 深圳奥比中光科技有限公司 | Multi-functional lighting module |
| 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 |
| CN110207940A (en) * | 2019-06-25 | 2019-09-06 | 中国航天空气动力技术研究院 | A kind of High-speed transient schlieren system applying to large tunnel |
| CN110824721A (en) * | 2019-09-24 | 2020-02-21 | 杭州驭光光电科技有限公司 | Method for designing diffractive optical element and diffractive optical element |
| CN110824721B (en) * | 2019-09-24 | 2021-11-23 | 杭州驭光光电科技有限公司 | Method for designing diffractive optical element and diffractive optical element |
| US11740483B2 (en) | 2019-09-24 | 2023-08-29 | Hangzhou Uphoton Optoelectronics Technology Co., Ltd. | Method of diffractive optical assembly, and diffractive optical assembly |
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Effective date of registration: 20170918 Address after: Jiaxing City, Zhejiang province Tongxiang 314500 Takahashi Takahashi Road No. 1156 Building 8 floor 3 Branch Park Applicant after: Jiaxing Yu light photoelectric technology Co. Ltd. Address before: 2 No. 452, No. 6, No. 310000, Poplar Street, Xiasha Economic Development Zone, Zhejiang, Hangzhou Province, 0804 Applicant before: HANGZHOU DONG SHANG OPTOELECTRONICS TECHNOLOGY CO., LTD. |
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Application publication date: 20160420 |