CN210954418U - Coupling lens and system thereof - Google Patents
Coupling lens and system thereof Download PDFInfo
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- CN210954418U CN210954418U CN201921939443.1U CN201921939443U CN210954418U CN 210954418 U CN210954418 U CN 210954418U CN 201921939443 U CN201921939443 U CN 201921939443U CN 210954418 U CN210954418 U CN 210954418U
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Abstract
The utility model discloses a coupling lens, including advancing light terminal surface and light-emitting terminal surface, advance the light terminal surface and for utilizing the fashioned curved surface that expands of can realizing expanding the beam to incident ray of biconical surface method design, the light-emitting terminal surface is for utilizing the fashioned coupling curved surface that can realize carrying out the coupling to incident ray of biconical surface method design. The coupling lens is the coupling lens, so that light rays with different angles emitted by the laser light source can enter the transmission optical fiber through the coupling lens in a coupling mode. The utility model discloses can compatible more light source, it is not high to light source light-emitting divergence angle requirement, possesses the beam and expands and the coupling function simultaneously, and the coupling is effectual.
Description
Technical Field
The utility model relates to a light processing technology field especially relates to a coupling lens and system thereof.
Background
In the field of optical communications, it is known to use optical lenses for optical coupling between laser diodes and optical fibers. The optical lens may be exemplified by an inexpensive spherical lens having low optical coupling efficiency and an aspherical lens having high optical coupling efficiency. Currently, optical fiber communication is basically mature, and the application of optical fiber light guide to illumination is a new development of optical fiber light guide technology. The optical fiber light guide illumination is a light guide illumination mode of photoelectric separation, and the output end of the optical fiber light guide illumination is not provided with any electrical equipment, so that the optical fiber light guide illumination is a light source with higher safety in places with fire danger and explosive gases, plays an important role in safety illumination and special illumination, and like optical fiber communication, an optical lens is also required to be used for the optical fiber light guide illumination.
The existing optical fiber light guide illumination is applied to some low-power decorative illumination, signal lamps and endoscopes, the effect presentation mainly depends on the light treatment of an optical lens, for example, a utility model patent with the publication number of CN108692293A discloses an LED free-form surface lens, and the lens consists of a plurality of first reflecting surfaces and a plurality of second refracting surfaces; first plane of reflection set up in the bottom of lens, the second plane of refraction is relative first plane of reflection set up in the top of lens, first plane of reflection encloses to establish and forms the plane of reflection cavity, the second plane of refraction encloses to establish and forms the plane of refraction cavity, the plane of reflection cavity with the plane of refraction cavity forms the lens cavity. The inner surface of the lens cavity is a hemispherical surface; the outer surface of the second refraction surface is smoothly arranged; the cross-sectional area of the second refraction surface is gradually reduced from bottom to top. The LED free-form surface lens can realize the uniform illumination of the limited light type of the far-near field three-petal shape, and has higher efficiency and uniformity. Also, for example, the utility model patent with publication number CN206563193U discloses "an optical fiber type laser white light illumination device", and specifically discloses a device including a red, green and blue three-color laser light source, a lens coupling system, an optical fiber or an optical fiber bundle, a lamp holder and a lamp cap; the red, green and blue laser light source comprises a red semiconductor laser, a green semiconductor laser and a blue semiconductor laser; the red laser emitted by the red semiconductor laser, the green laser emitted by the green semiconductor laser and the blue laser emitted by the blue semiconductor laser are condensed by the lens coupling system, transmitted to the lamp holder through optical fibers or optical fiber bundles, and mixed by the lamp holder to form white light illumination output.
At present, most of optical lenses used in optical coupling systems for optical fiber light guide communication or illumination have a three-lens combined structure with good coupling effect, and mainly use plano-concave lenses to realize diffusion effect and convex-flat lenses to realize collimation effect, slow axis is expanded by the plano-concave and convex-flat lenses to reduce divergence angle deviation, and then laser is converged by aspheric lenses.
At present, the following problems mainly exist in the application of the three-lens combined structure:
1. the surface of the lens is generally spherical, so that light rays with different angles are easily converged at one point, and the optical fiber is easily fused due to too high single-point energy;
2. the lenses are spherical mirrors and traditional imaging convex lenses, so that the semiconductor laser has higher requirements on the light-emitting divergence angle;
3. the packaging is complex, each lens needs to be aligned, glue is dispensed and fixed, the consumption of manpower and material resources is large, the packaging is complex and the cost is high;
4. the lens function is single, and the coupling efficiency is low.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is not enough to above-mentioned prior art, provide one kind and can compatible more light source, it is not high to the light source light-emitting angle requirement of diverging, possesses the beam and expands the beam and the coupling function simultaneously, coupling lens and system effectual.
In order to realize the purpose, the utility model discloses a technical scheme be:
the utility model provides a coupling lens, is including advancing light terminal surface and light-emitting terminal surface, it can realize the beam expanding curved surface that expands to incident ray for utilizing the fashioned beam expanding curved surface that can design of biconical surface method to advance the light terminal surface, the light-emitting terminal surface is for utilizing the fashioned coupling curved surface that can realize carrying out the coupling to incident ray of biconical surface method design.
Further, the beam expanding curved surface and the coupling curved surface satisfy a non-imaging optical method and the following equation system:
wherein the content of the first and second substances,
is a light distribution curve of the special-shaped light source,
representing a spatial angular parameter of the light emitting surface hemisphere of the light source,
is the energy distribution of the object and,
the position of the target point in space is determined,
the optical operator is represented by an optical operator,
respectively representing the refractive index and the biconic surface,
the double-cone equation is satisfied,
representing target energy distribution and light source distributionThe mapping relation between the curves is satisfied
Alignment of the main optical axes in coincidence relation
Constraints on the conservation of energy relationship.
The utility model provides a coupling lens system, includes laser light source, coupling lens and transmission fiber, coupling lens is located laser light source with just more be close to between the transmission fiber sets up, coupling lens is including advancing light terminal surface and light-emitting terminal surface, advance the light terminal surface for utilizing the fashioned beam expanding curved surface that can realize expanding to incident ray of biconical surface method design, the light-emitting terminal surface carries out the coupling curved surface of coupling for utilizing the fashioned coupling curved surface that can realize carrying out incident ray of biconical surface method design, makes the light warp of different angles that laser light source sent the coupling lens coupling gets into transmission fiber.
Further, the beam expanding curved surface and the coupling curved surface satisfy a non-imaging optical method and the following equation system:
wherein the content of the first and second substances,
is a light distribution curve of the special-shaped light source,
representing a spatial angular parameter of the light emitting surface hemisphere of the light source,
is the energy distribution of the object and,
the position of the target point in space is determined,
the optical operator is represented by an optical operator,
respectively representing the refractive index and the biconic surface,
the double-cone equation is satisfied,
represents the mapping relation between the target energy distribution and the light source light distribution curve and meets the requirement
Alignment of the main optical axes in coincidence relation
Constraints on the conservation of energy relationship.
Further, the light type of the laser light source is a fast-slow axis heterotype, a rotational symmetry type or a mode separation type.
Further, the light pattern of the laser light source may be any one of a plurality of light patterns having different light parameter products.
Further, the transmission fiber is a multimode fiber or a glass fiber.
Further, the transmission fiber is a multimode fiber, and the refractive index of the transmission fiber is step type or gradient type.
Further, the transmission fiber is any one multimode fiber with the core diameter of 50um, 62.5um and 105 um.
The laser light source, the coupling lens and the transmission optical fiber are sequentially aligned along the central optical axis of the coupling lens and are packaged and fixed through the packaging clamp.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
the utility model discloses a coupling lens utilizes the biconical surface design approach to form a lens that both sides all are the biconical surface form, can realize expanding earlier of light source incident ray and expand the back coupling, and it is not high to the light-emitting divergence angle requirement of light source, can compatible multiple light-emitting divergence angle's light source, especially laser source, can guarantee that its coupled light-emitting ray does not concentrate and assemble in a certain point, can avoid the phenomenon of melting that energy density is too high to lead to, high coupling effect under the single lens condition has been realized, later stage and other systems are supporting to be used, the unstable factor is few, the effect is stable, it is simpler to encapsulate, the cost is more practiced thrift; the utility model discloses a coupling lens system, applied the coupling lens that utilizes the biconical surface design method shaping in the system that laser source and transmission fiber constitute, realized the abundant plastic of laser, can high-efficiently, effectual couple the most light that the laser source launches into transmission fiber, can avoid the burn-out of transmission fiber, realized the light transmission of more distant high efficiency, low cost; the system also utilizes the packaging fixture to carry out packaging fixation, improves the stability of system laser propagation, has good light emitting effect, can meet the application of a plurality of scenes such as short-distance or even long-distance illumination, communication and the like, has simple structure, is suitable for the requirement of mass production, and saves the application cost.
Drawings
In order to more clearly illustrate embodiments of the present invention or the technical solutions of the prior art, the drawings are as follows:
fig. 1 is a schematic structural diagram of a coupling lens provided in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a coupling lens system provided in embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a preferred coupling lens system provided in embodiment 2 of the present invention.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
Example 1
As shown in fig. 1, the present embodiment provides a coupling lens, which is made of optical glass, and includes an entrance end face and an exit end face, where the entrance end face is an expanded beam curved surface 21 that is designed and formed by a biconical surface method and can expand incident light, the exit end face is a coupling curved surface 22 that is designed and formed by a biconical surface method and can couple incident light, the expanded beam curved surface 21 and the coupling curved surface 22 both have a biconical surface shape with naked eyes, and the biconical surface method is designed as a conventional mathematical method, and the design of the biconical surface secondary enveloping toroidal worm gear pair in the literature "drilling camera system research based on biconical mirror imaging" published in the journal of petromechanics and engineering, or in the prior art can be referred to in korean.
The coupling lens is an aspheric lens designed by a biconical surface method, the surface of the beam expansion curved surface 21 realizes light beam expansion by the biconical surface design method according to a light distribution curve of a light source, the purposes of expanding the diameter of the light beam and reducing the divergence angle of the light beam are achieved, particularly, light of a special-shaped laser light source can be shaped to the coupling curved surface 22, the coupling curved surface 22 realizes light coupling by the biconical surface design method, the coupling lens can ensure that the light does not converge at one point, so that the burning and melting phenomenon caused by overhigh energy density can be avoided, the coupling after beam expansion is realized by only one lens, the requirement on the light emitting divergence angle of the light source is not high, the light source with various light emitting divergence angles can be compatible, the coupling effect is good, the packaging is simpler, and the cost is.
Specifically, the coupling lens design flow is as follows:
1. determining a light distribution curve of a light source of an applied environment;
2. determining the design target energy distribution condition;
3. determining a mapping relation between target energy distribution and a light distribution curve of a light source;
4. ensuring that the light source, the coupling lens and the light receiving object meet the constraints of the optical axis alignment coincidence relation and the energy conservation relation;
5. determining an adaptive double-conical surface method according to the mapping relation to obtain a characteristic curve;
6. the coupling lens is configured and fabricated according to the characteristic curve.
According to the above steps, in a specific embodiment, the beam expanding curved surface 21 and the coupling curved surface 22 satisfy the following formula:
wherein the content of the first and second substances,
is a light distribution curve of the special-shaped light source,
representing a spatial angular parameter of the light emitting surface hemisphere of the light source,
is the energy distribution of the object and,
the position of the target point in space is determined,
the optical operator is represented by an optical operator,
respectively representing the refractive index and the biconic surface,
the double-cone equation is satisfied,
the mapping relation between target energy distribution and light source light distribution curve is represented, and the light source, the coupling lens and the light receiving object meet the requirements
Alignment of the main optical axes in coincidence relation
Constraints on the conservation of energy relationship.
The parameters obtained by calculation by the method are applied to the design of the beam expanding curved surface 21 and the coupling curved surface 22, so that a biconical surface coupling lens with better adaptability with a light source can be obtained, and the coupling lens is used close to the end surface of the transmission optical fiber, so that light rays can be ensured not to be converged at one point, and the optical fiber fusing phenomenon caused by overhigh energy density is avoided. Compared with the free-form surface lens in the prior art, the design and processing are simpler, and the cost is lower.
Example 2
As shown in fig. 2, this embodiment provides a coupling lens system, which applies the coupling lens described in embodiment 1 to couple and transmit light, specifically, the system includes a laser light source 1, a coupling lens 2 and a transmission fiber 3, the coupling lens 2 is located between the laser light source 1 and the transmission fiber 3 and is disposed closer to the transmission fiber 3, and, in particular, the coupling lens 2 comprises a light inlet end face and a light outlet end face, the light inlet end face is a beam expanding curved surface 21 which is designed and formed by a biconical surface method and can realize beam expansion of incident light, the light-emitting end surface is a coupling curved surface 22 which is designed and formed by a biconical surface method and can couple incident light, the expanded beam curved surface 21 and the coupling curved surface 22 both have a double conical surface shape with naked eyes, so that light rays emitted by the laser light source 1 at different angles can be coupled into the transmission optical fiber 3 through the coupling lens 2. Based on the characteristics of the coupling lens 2, the system has high coupling efficiency, and the coupled light is not concentrated and converged at a certain point, but forms different focuses to be connected into a focal line to be converged into the transmission optical fiber 3, so that the energy is uniformly distributed in the transmission optical fiber 3, and the end face of the transmission optical fiber 3 can avoid the phenomenon of melting.
Further, the beam expanding curved surface 21 and the coupling curved surface 22 satisfy the non-imaging optical method and the following equation system:
wherein the content of the first and second substances,
is a light distribution curve of the special-shaped light source emitted from the laser light source 1,
representing a spatial angular parameter of the light emitting surface hemisphere of the light source,
is the energy distribution of the object and,
the position of the target point in space is determined,
the optical operator is represented by an optical operator,
respectively representing the refractive index and the biconic surface,
the double-cone equation is satisfied,
the mapping relation between target energy distribution and light source light distribution curve is shown, and the laser light source 1, the coupling lens 2 and the transmission optical fiber 3 meet the requirements
Alignment of the main optical axes in coincidence relation
Constraints on the conservation of energy relationship.
By using the scheme, the coupling lens with high matching performance can be customized for the laser light source 1.
The light type of the laser light source 1 is a fast-slow axis special-shaped type or a rotational symmetry type or a mode separation type.
Or the light type of the laser light source 1 may be any one of a plurality of light types having different light parameter products.
The transmission optical fiber 3 is a multimode optical fiber or a glass optical fiber. Preferably, the transmission fiber 3 is a glass fiber, which is smaller in diameter (0.1-0.5 mm, but its transmission target is energy light quantum) than a conventional plastic fiber. The transmission fiber 3 includes a core and a cladding disposed outside the core. The fiber core is made of various glass, the cost is low, the bearable energy density is high, a single fiber can bear more than 100W of power, and the transmission loss is low and is generally 5-20 dB/km. The optical fiber end face can be cut and welded, and the coupling efficiency can not be reduced due to the difficulty in end face treatment. One end of the transmission fiber 3 is opposite to the coupling lens 2 to couple light into the fiber, and the other end can be connected with a lamp cap for illumination.
Or preferably, the transmission fiber 3 is a multimode fiber, the refractive index of which is step-type or gradient-type. For a gradient multimode fiber, the refractive index of the core is smallest at the periphery of the core and gradually increases toward the center point, thereby reducing the modal dispersion of the signal, whereas for a step cable, the refractive index is substantially uniform and decreases abruptly only at the cladding surface. Step fibers generally have lower bandwidth than gradient fibers. In summary, the refractive index type is selected according to the application environment of the coupling lens system.
The transmission fiber 3 is preferably a multimode fiber having a core diameter of any one of 50um, 62.5um, and 105 um.
As shown in fig. 3, the system further includes a packaging fixture 4, and the laser light source 1, the coupling lens 2, and the transmission fiber 3 are aligned along the central optical axis of the coupling lens 2 in sequence and are packaged and fixed by the packaging fixture 4.
In conclusion, the system of the scheme applies the coupling lens formed by the double-cone design method to the system consisting of the laser source and the transmission optical fiber, and the coupling lens is set to be in a single lens form, so that not only is the laser fully shaped realized, but also most of light emitted by the laser source can be coupled into the transmission optical fiber with high efficiency and good effect, the burning and melting of the transmission optical fiber can be avoided, the packaging is simple, and the light transmission with high efficiency and low cost at a longer distance is realized; in addition, the system is further packaged and fixed by using a packaging clamp, the laser propagation stability of the system is improved, the light emitting effect is good, the application in multiple scenes such as short-distance or even long-distance illumination and communication can be met, the structure is simple, the requirements on mass production are met, and the application cost is saved.
One embodiment is as follows: the laser light source 1 is a semiconductor laser, the laser light source 1 is a fast-slow axis special-shaped light type, light beams in the horizontal axis direction are diffused, light beams in the vertical axis direction are converged, the transmission optical fiber 3 adopts a multi-mode optical fiber with an FC optical fiber joint, the coupling lens 2 is a lens designed by establishing an equation set according to a light distribution curve of the semiconductor laser and energy distribution of a preset coupling target point and solving obtained lens parameters by using a biconical surface method, light rays are emitted from the semiconductor laser and are fully expanded through the beam expansion curved surface 21 of the coupling lens 2, then, the light rays with different angles emitted from the semiconductor laser are not converged into a focus like a conventional lens through the coupling action of the coupling curved surface 22, but different focuses are formed to be connected into a focal line, so that the energy is uniformly distributed in the optical fiber, and the optical fiber is prevented from being burnt and melted due to overhigh single-point energy.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The utility model provides a coupling lens system, its characterized in that includes laser light source, coupling lens and transmission fiber, coupling lens is located laser light source with between the transmission fiber and more be close to transmission fiber sets up, coupling lens is including advancing light terminal surface and light-emitting terminal surface, advance the light terminal surface for utilizing the fashioned beam expanding curved surface that can realize expanding the beam to incident ray of biconical surface method design, the light-emitting terminal surface is for utilizing the fashioned coupling curved surface that can realize carrying out the coupling to incident ray of biconical surface method design, makes the light warp of different angles that laser light source sent the coupling lens coupling gets into transmission fiber.
2. A coupling lens system according to claim 1, wherein said beam expanding curved surface and said coupling curved surface satisfy a non-imaging optical method and the following system of equations:
wherein the content of the first and second substances,
is a light distribution curve of the special-shaped light source,
representing a spatial angular parameter of the light emitting surface hemisphere of the light source,
is the energy distribution of the object and,
the position of the target point in space is determined,
the optical operator is represented by an optical operator,
respectively representing the refractive index and the biconic surface,
the double-cone equation is satisfied,
to show the eyesThe mapping relation between the standard energy distribution and the light source light distribution curve meets the requirement
Alignment of the main optical axes in coincidence relation
Constraints on the conservation of energy relationship.
3. The coupling lens system of claim 1, wherein the light pattern of the laser source is fast-slow axis irregular or rotational symmetric or mode-separated.
4. The coupling lens system of claim 1, wherein the laser source beam pattern is any one of a plurality of beam patterns with different optical parameter products.
5. A coupling lens system according to claim 1, wherein the transmission fiber is a multimode fiber or a glass fiber.
6. A coupling lens system according to claim 1, wherein the delivery fiber is a multimode fiber having a step or gradient index of refraction.
7. A coupling lens system according to claim 1, wherein the transmission fiber is a multimode fiber having a core diameter of any one of 50um, 62.5um and 105 um.
8. The coupling lens system of claim 1, further comprising a packaging fixture, wherein the laser source, the coupling lens and the transmission fiber are sequentially aligned along a central optical axis of the coupling lens and are packaged and fixed by the packaging fixture.
9. The coupling lens is characterized by comprising a light inlet end face and a light outlet end face, wherein the light inlet end face is a beam expanding curved surface which is formed by a double-cone method and can realize beam expansion of incident light, and the light outlet end face is a coupling curved surface which is formed by a double-cone method and can realize coupling of the incident light.
10. A coupling lens according to claim 9, wherein said beam expanding curved surface and said coupling curved surface satisfy a non-imaging optical method and the following system of equations:
wherein the content of the first and second substances,
is a light distribution curve of the special-shaped light source,
representing a spatial angular parameter of the light emitting surface hemisphere of the light source,
is the energy distribution of the object and,
the position of the target point in space is determined,
the optical operator is represented by an optical operator,
respectively representing the refractive index and the biconic surface,
the double-cone equation is satisfied,
represents the mapping relation between the target energy distribution and the light source light distribution curve and meets the requirement
Alignment of the main optical axes in coincidence relation
Constraints on the conservation of energy relationship.
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| CN201921939443.1U CN210954418U (en) | 2019-11-12 | 2019-11-12 | Coupling lens and system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110837152A (en) * | 2019-11-12 | 2020-02-25 | 浙江光塔节能科技有限公司 | Coupling lens and system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110837152A (en) * | 2019-11-12 | 2020-02-25 | 浙江光塔节能科技有限公司 | Coupling lens and system thereof |
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Address after: Room e-405-406, No. 198, Qidi Road, Xiaoshan Economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee after: Zhejiang Guangta Safety Technology Co.,Ltd. Address before: Room E-405-406, 198 Kaidi Road, Xiaoshan Economic and Technological Development Zone, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG GUANGTA ENERGY-SAVING TECHNOLOGY Co.,Ltd. |
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