CN112162368A - Free-form surface reflective coupling lens - Google Patents
Free-form surface reflective coupling lens Download PDFInfo
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- CN112162368A CN112162368A CN202011150104.2A CN202011150104A CN112162368A CN 112162368 A CN112162368 A CN 112162368A CN 202011150104 A CN202011150104 A CN 202011150104A CN 112162368 A CN112162368 A CN 112162368A
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- guide part
- light guide
- light
- free
- form surface
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- 230000008878 coupling Effects 0.000 title claims abstract description 35
- 238000010168 coupling process Methods 0.000 title claims abstract description 35
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/421—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical component consisting of a short length of fibre, e.g. fibre stub
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
Abstract
A free-form surface reflective coupling lens relates to the technical field of coupling lenses. The optical coupling lens structure comprises a first light guide part corresponding to a laser light source and a second light guide part corresponding to a light receiving module; a free curved surface part is arranged at the included angle of the optical axes of the first light guide part and the second light guide part; the deflection angle of the incident light of the chief ray of the first light guide part and the emergent light of the second light guide part on the free-form surface part is between 45+/-3 degrees; the laser light source guided by the first light guide part is reflected by the free curved surface part, forms converged light and then is emitted from the second transmission surface of the second light guide part. Lens surfaces do not need to be processed on the light incident side and the light emergent side of the lens respectively, the structure is simple, and the lens is suitable for mass production. The reflection type lens with the free-form surface is insensitive to the wavelength of the laser light source, the wavelength drift of the laser does not influence the coupling efficiency, and the reflection type lens is suitable for laser light sources with different wavelengths and has high coupling efficiency.
Description
Technical Field
The invention relates to the field of optical elements, in particular to the technical field of coupling lenses.
Background
In the field of optical communication, an optical coupling lens is used between a laser light source and a light receiving module to realize optical coupling. As shown in fig. 1, the conventional coupling lens is provided with a collimating and transmitting surface 122 at the light-in side, and a focusing lens surface 121 at the light-out side, and the light-out of the laser source enters the coupling lens through the collimating and transmitting surface, and is directly focused by the focusing lens surface and then transmitted to the light-receiving module, or is transmitted by the total reflection surface 114 and then transmitted from the focusing lens surface 121 to the light-receiving module. For example: the application numbers are: CN2012103680474 discloses an optical coupling lens, which adopts the above-mentioned structure when performing optical coupling. The lens surfaces are required to be respectively processed in two vertical directions when the structure is used, the manufacturing process is complex, the process requirement is high, and the production cost is high.
Disclosure of Invention
In summary, the present invention is directed to a free-form surface reflective coupling lens, which solves the technical deficiencies of the conventional optical coupling lens structure that lens surfaces are required to be respectively processed on the light incident side and the light emitting side of the lens, the manufacturing process is complex, the process requirement is high, and the production cost is high.
In order to solve the technical problems provided by the invention, the technical scheme is as follows:
a free-form surface reflective coupling lens is characterized in that the coupling lens comprises a first light guide part corresponding to a laser light source and a second light guide part corresponding to a light receiving module; one side of the first light guide part corresponding to the laser light source is a first transmission surface, one side of the second light guide part corresponding to the light receiving module is a second transmission surface, and a free curved surface part is arranged at an included angle of optical axes of the other side of the first light guide part and the other side of the second light guide part; the free-form surface part comprises a base material which is integrally formed with the first light guide part and the second light guide part and the outer surface of which is in a free-form surface shape, and a reflecting film layer arranged on the outer layer of the free-form surface; the deflection angle of the incident light of the chief ray of the first light guide part and the emergent light of the second light guide part on the free-form surface part is between 45+/-3 degrees; the laser light source guided by the first light guide part is reflected by the free curved surface part, forms converged light and then emits the converged light from the second transmission surface of the second light guide part, and the emitted converged focus corresponds to the light receiving module to realize light coupling.
The parameter characteristics of the free-form surface reflective coupling lens satisfy the following formula:
wherein z is the vector quantity of the free-form surface, c is the curvature of the vertex of the free-form surface, k is a cone coefficient, AiEi is the coefficient of a high-order term of the free-form surface, x and y are x and y coordinates of a point on the free-form surface, and x, y and z jointly form a point 3-dimensional coordinate; and the curvature radius of the vertex of the curved surface R = 1/c.
The first light guide part and the second light guide part are both in a conical structure, and the first transmission surface and the second transmission surface are respectively conical bottom end surfaces of the first light guide part and the second light guide part.
The invention has the beneficial effects that: the invention adopts the free-form surface to realize the convergence and the turning of the light rays by directly reflecting the light rays through the free-form surface without respectively processing the lens surface on the light incident side and the light emergent side of the lens, has simple structure and is suitable for mass production. The invention adopts the free-form surface reflective lens, and has the advantages of insensitivity to the wavelength of the laser light source, no influence on the coupling efficiency due to the wavelength drift of the laser, high coupling efficiency and suitability for laser light sources with different wavelengths.
Drawings
Fig. 1 is a schematic structural diagram of a conventional coupling lens.
FIG. 2 is a schematic structural diagram of a coupling lens according to the present invention.
Fig. 3 is a schematic perspective view of the present invention.
Detailed Description
The structure of the present invention will be further described with reference to the accompanying drawings and preferred embodiments of the present invention.
Referring to fig. 2 and 3, the free-form surface reflective coupling lens disclosed in the present invention includes a first light guide portion 1 corresponding to a laser light source and a second light guide portion 2 corresponding to a light receiving module; one side of the first light guide part 1 corresponding to the laser light source is a first transmission surface 11, one side of the second light guide part 2 corresponding to the light receiving module is a second transmission surface 21, and a free curved surface part 3 is arranged at an included angle of optical axes of the other side of the first light guide part 1 and the other side of the second light guide part 2; the preferred scheme is as follows: the first light guide part 1 and the second light guide part 2 are both in a conical structure, and the first transmission surface and the second transmission surface are respectively conical bottom end surfaces of the first light guide part and the second light guide part. The free-form surface part comprises a base material which is integrally formed with the first light guide part and the second light guide part and the outer surface of which is in a free-form surface shape, and a reflecting film layer arranged on the outer layer of the free-form surface; the substrate is used for forming a specific free-form surface shape, and the reflecting film layer realizes the surface reflecting effect through a film coating process. The deflection angle of the incident light of the chief ray of the first light guide part and the emergent light of the second light guide part on the free-form surface part is between 45+/-3 degrees; the laser light source guided by the first light guide part is reflected by the free curved surface part, forms converged light and then emits the converged light from the second transmission surface of the second light guide part, and the emitted converged focus corresponds to the light receiving module to realize light coupling.
The parameter characteristics of the free-form surface reflective coupling lens of the invention satisfy the following formula:
wherein z is the vector quantity of the free-form surface, c is the curvature of the vertex of the free-form surface, k is a cone coefficient, AiEi is the coefficient of a high-order term of the free-form surface, x and y are x and y coordinates of a point on the free-form surface, and x, y and z jointly form a point 3-dimensional coordinate; and the curvature radius of the vertex of the curved surface R = 1/c.
In the implementation process, according to the above formula description of the free-form surface, the curvature radius R of the vertex of the surface, the conic coefficient k and the coefficient AiEi of the high-order term of the free-form surface can specifically adopt the data in the following table, wherein X1Y0 represents the high-order term A1E0 (X, Y), i.e. X1Y 0X ^ 1Y ^ 0; X0Y1 represents the high-order term A0E1 (X, Y), i.e., X0Y 1X 0Y 1; X3Y1 represents the high order term A3E1 (X, Y), i.e., X3Y 1X 3Y 1; and so on.
The free-form surface reflective coupling mirror of the invention has the working mode that: the laser light source emits light and then reflects the light through the free-form surface reflecting surface to form convergent light for emitting, the coupling can be realized by placing an optical fiber or other coupling target devices at a convergent focus, and the light can enter the optical fiber and be focused by a focusing lens without the help of a collimating lens, and the free-form surface reflecting lens has the following advantages:
1. the laser is insensitive to the wavelength of the light source, the wavelength drift of the laser does not influence the coupling efficiency, and the laser is suitable for laser light sources with different wavelengths.
2. The light can directly realize the collimation effect through a free-form surface, and meanwhile, the light can be converged and turned while being reflected, so that the structure is simple, and the device is suitable for mass production.
Claims (3)
1. A free-form surface reflective coupling lens is characterized in that the coupling lens comprises a first light guide part corresponding to a laser light source and a second light guide part corresponding to a light receiving module; one side of the first light guide part corresponding to the laser light source is a first transmission surface, one side of the second light guide part corresponding to the light receiving module is a second transmission surface, and a free curved surface part is arranged at an included angle of optical axes of the other side of the first light guide part and the other side of the second light guide part; the free-form surface part comprises a base material which is integrally formed with the first light guide part and the second light guide part and the outer surface of which is in a free-form surface shape, and a reflecting film layer arranged on the outer layer of the free-form surface; the deflection angle of the incident light of the chief ray of the first light guide part and the emergent light of the second light guide part on the free-form surface part is between 45+/-3 degrees; the laser light source guided by the first light guide part is reflected by the free curved surface part, forms converged light and then emits the converged light from the second transmission surface of the second light guide part, and the emitted converged focus corresponds to the light receiving module to realize light coupling.
2. The freeform reflectively coupled lens of claim 1, wherein: the parameter characteristics of the free-form surface reflective coupling lens satisfy the following formula:
wherein z is the vector quantity of the free-form surface, c is the curvature of the vertex of the free-form surface, k is a cone coefficient, AiEi is the coefficient of a high-order term of the free-form surface, x and y are x and y coordinates of a point on the free-form surface, and x, y and z jointly form a point 3-dimensional coordinate; and the curvature radius of the vertex of the curved surface R = 1/c.
3. The freeform reflectively coupled lens of claim 1, wherein: the first light guide part and the second light guide part are both in a conical structure, and the first transmission surface and the second transmission surface are respectively conical bottom end surfaces of the first light guide part and the second light guide part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011150104.2A CN112162368A (en) | 2020-10-23 | 2020-10-23 | Free-form surface reflective coupling lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011150104.2A CN112162368A (en) | 2020-10-23 | 2020-10-23 | Free-form surface reflective coupling lens |
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| CN112162368A true CN112162368A (en) | 2021-01-01 |
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| CN202011150104.2A Pending CN112162368A (en) | 2020-10-23 | 2020-10-23 | Free-form surface reflective coupling lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113835232A (en) * | 2021-09-30 | 2021-12-24 | 华中科技大学 | Speckle dissipation device, laser projection imaging system and laser illumination imaging system |
| CN114019666A (en) * | 2021-10-25 | 2022-02-08 | 中国科学院长春光学精密机械与物理研究所 | Total reflection type LED (light emitting diode) micro-lighting light distribution element |
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2020
- 2020-10-23 CN CN202011150104.2A patent/CN112162368A/en active Pending
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| US10007072B1 (en) * | 2017-02-28 | 2018-06-26 | Foxconn Interconnect Technology Limited | Optical coupling system having a perturbed curved optical surface that reduces back reflection and improves mode matching in forward optical coupling |
| CN109085734A (en) * | 2017-06-13 | 2018-12-25 | 艾优优（深圳）技术有限公司 | Laser light source Multiplexing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113835232A (en) * | 2021-09-30 | 2021-12-24 | 华中科技大学 | Speckle dissipation device, laser projection imaging system and laser illumination imaging system |
| CN114019666A (en) * | 2021-10-25 | 2022-02-08 | 中国科学院长春光学精密机械与物理研究所 | Total reflection type LED (light emitting diode) micro-lighting light distribution element |
| CN114019666B (en) * | 2021-10-25 | 2023-08-25 | 中国科学院长春光学精密机械与物理研究所 | Total reflection type LED micro-lighting light distribution element |
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