CN209879066U - Optical fiber coupling system - Google Patents
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- CN209879066U CN209879066U CN201920345096.3U CN201920345096U CN209879066U CN 209879066 U CN209879066 U CN 209879066U CN 201920345096 U CN201920345096 U CN 201920345096U CN 209879066 U CN209879066 U CN 209879066U
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Abstract
An optical fiber coupling system belongs to the technical field of illumination. The system comprises a laser light source, a beam expanding collimating lens group, a coupling lens and an optical fiber; the beam expanding collimating lens group and the coupling lens are sequentially arranged between the laser light source and the optical fiber; and light rays emitted by the laser light source are subjected to slow-axis beam expanding collimation through the beam expanding and collimating lens group, and the light rays subjected to beam expanding collimation are converged on the end face of the optical fiber through the coupling lens. The utility model discloses the structure is simple and convenient, has a plurality of adjustable degrees of freedom, is applicable to the great light source of light-emitting characteristic difference nature and all has the coupling efficiency of superelevation.
Description
Technical Field
The utility model relates to the field of lighting technology, especially, relate to an optical fiber coupling system for illumination.
Background
The laser optical fiber coupling technology is as follows: the light emitted by the laser light source is effectively collimated and shaped by the optical system and then coupled into the optical fiber, and the semiconductor laser has the defects of poor quality of output light beams, large divergence angle and the like, particularly the slow axis is greatly influenced by the width of a bar, in addition, the difference between different light sources is obvious, and the output of the laser and the coupling efficiency of the optical fiber and the consistency of the coupling efficiency of different light sources can be influenced in practical application, so in order to improve the coupling efficiency and consistency of the optical fiber, the fast axis and the slow axis of the optical fiber must be respectively optimized, and the divergence angle of the fast axis and the slow axis of the optical fiber is reduced, so that the requirement of optical fiber coupling is met. The semiconductor laser fast and slow axis collimation method mainly comprises cylindrical lens collimation, self-focusing lens collimation and aspheric lens collimation, the three methods can compress the divergence angle of a light beam, meanwhile, the width of the light beam is increased, and the following problems also exist:
1. and (3) collimation of the cylindrical lens: the cylindrical lens has large spherical aberration, is difficult to package and adjust, and cannot be used in scenes with high light beam quality requirements.
2. The collimating effect of the self-focusing lens is slightly worse than that of the aspherical mirror.
Utility model patent CN201420863520.0 discloses a high power semiconductor laser fiber coupling system to specifically disclose the system and include that the semiconductor laser who sets gradually along the light path folds battle array, little collimating lens, closes a beam device, slow axis collimating lens, fast axis collimating lens, optic fibre. The system needs to collimate the slow axis and the fast axis of the light beam respectively, and is mainly used for solving the power problem of laser beam combination although the light energy loss rate is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem that prior art exists, a slow axle expands beam collimation, high and wide optical fiber coupling system of adaptability of coupling efficiency is proposed.
The utility model discloses a can realize through following technical scheme:
the utility model provides an optical fiber coupling system, which comprises a laser light source, a beam expanding collimating lens group, a coupling lens and optical fibers; the beam expanding collimating lens group and the coupling lens are sequentially arranged between the laser light source and the optical fiber; and light rays emitted by the laser light source are subjected to slow-axis beam expanding collimation through the beam expanding and collimating lens group, and the light rays subjected to beam expanding collimation are converged on the end face of the optical fiber through the coupling lens.
Preferably, the beam expanding and collimating lens group comprises a plano-concave cylindrical lens and a convex plano-cylindrical lens; the plano-concave cylindrical lens and the convex plano-cylindrical lens are sequentially arranged between the laser light source and the coupling lens; the flat-concave cylindrical lens is used for performing slow-axis beam expansion on light rays emitted by the laser light source, the convex-flat cylindrical lens is used for performing slow-axis collimation on the light rays after beam expansion, and the light rays after beam expansion and collimation are converged on the end face of the optical fiber through the coupling lens.
Preferably, the coupling lens is an aspherical lens.
Preferably, the optical fiber is a multimode optical fiber with a core diameter of 62.5 or 105 microns; alternatively, the fiber is a silica fiber having a core diameter greater than 105 microns and larger. Preferably, the laser light source, the beam expanding collimating lens group and the coupling lens are coaxial in light path and adjusted and aligned to the optical fiber, and are packaged into a whole through a packaging sleeve to be cured, so that the laser lighting device is formed.
Preferably, the packaging sleeve comprises a first packaging tube and a second packaging tube, the first packaging tube is used for packaging the laser source and the beam expanding and collimating lens group, the second packaging tube is used for mounting the coupling lens, and the optical fiber is connected with the second packaging sleeve through a quartz sleeve; the first packaging tube is connected with the second packaging tube.
Preferably, the beam expanding and collimating lens group is packaged in the first packaging tube through ultraviolet curing glue or laser welding.
Preferably, the laser light source is mounted on the packaging sleeve through a copper base.
Preferably, the laser light source is a semiconductor laser with a biaxial collimating lens.
The utility model discloses following beneficial effect has:
the utility model relates to an optical fiber coupling system only carries out the slow axis collimation with the light beam through expanding beam collimating lens group, and optic fibre is gone into in the coupling of rethread coupling lens, and coupling efficiency is high, and the coupling efficiency of if multimode optic fibre can reach more than 98%, can reach 99.9% basically like the coupling efficiency of the energy optic fibre more than 100 microns of fibre core to be applicable to the great light source of light-emitting characteristic difference.
Drawings
Fig. 1 is a schematic structural diagram of an optical fiber coupling system according to the present invention;
fig. 2 is a schematic diagram of a package structure of an optical fiber coupling system according to 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.
The quality of a light beam emitted by a laser light source is poor, the divergence angle is large, and in practical application, the large divergence angle affects the output of a laser and the coupling efficiency of an optical fiber, so that the light beam needs to be collimated, and the divergence angle of the light beam is reduced to meet the requirement of optical fiber coupling.
The existing optical fiber coupling system needs to adjust the fast and slow axes respectively, wherein the fast axis has large divergence angle deviation of different light sources due to factors such as light source tolerance and the like, and even multiple forms from divergence to convergence can appear, so that the fast axis collimation of all the light sources is difficult to realize through a group of lenses, and the fast axis collimation is often realized through a plurality of light source processing steps by using a plurality of groups of lenses or a plurality of light source processing devices. The utility model discloses consider that fast axle itself luminous width is very little, can regard as the pointolite, and same light source has almost not the extended light source effect, then can not form the diffuse spot behind the coupling lens. And the slow axis width is larger, so that the influence is more obvious. Based on this, the utility model provides an optical fiber coupling system.
As shown in fig. 1, the present invention relates to an optical fiber coupling system, which comprises a laser source 2, a beam expanding collimating lens assembly 10, a coupling lens 5, and an optical fiber 8. The beam expanding and collimating lens group 10 and the coupling lens 5 are sequentially arranged between the laser light source 2 and the optical fiber 8. The light emitted by the laser source 2 is subjected to slow-axis beam expansion collimation through the beam expansion collimation lens group 10, and the collimated light is coupled and converged on the end face of the optical fiber 8 through the coupling lens 5. The beam expanding collimating lens group 10 expands the beam of the slow axis, reduces the divergence angle of the slow axis, and keeps the fast axis unchanged.
The beam expanding and collimating lens group 10 comprises a plano-concave cylindrical lens 3 and a convex plano-cylindrical lens 4. The plano-concave cylindrical lens 3 and the convex plano-cylindrical lens 4 are sequentially arranged between the laser light source 2 and the coupling lens 5. The plano-concave cylindrical lens 3 is used for performing slow axis beam expansion on light rays emitted by the laser light source 2, the convex plano-cylindrical lens 4 is used for performing slow axis collimation on the expanded light rays, and the collimated light rays are converged on the end face of the optical fiber 8 through the coupling lens 5, so that the coupling efficiency of the laser and the optical fiber is improved. Under the standard condition, the light emitting characteristic of the light source accords with the maximum probability distribution, the laser light source 2 is positioned at the focus of the plano-concave cylindrical lens 3, and the focus of the coupling lens 5 is positioned at the end face of the optical fiber 8.
The laser light source is a semiconductor laser with a biaxial collimating lens, such as a 450nm blue laser light source. The divergence angle of the light source is large before passing through the lens, and the light source passing through the axial collimating lens still has the divergence angle but the divergence angle is small.
The coupling lens is an aspheric lens, so that spherical aberration can be reduced, and light spots on the end face of the optical fiber are smaller.
The optical fiber is a multimode optical fiber with a core diameter of 62.5 or 105 microns; or the optical fiber is a quartz optical fiber with the core diameter larger than 105 microns.
Fig. 2 shows that will among the fiber coupling system of the utility model the laser source, expand beam collimating lens group coupling lens optic fibre pass through the structure behind the encapsulation sleeve pipe encapsulation. The packaged integrated structure forms a laser lighting device.
The encapsulation sleeve comprises a first encapsulation tube 61, a second encapsulation tube 62. The first packaging tube 61 is used for packaging the laser light source 2 and the beam expanding and collimating lens group 10. Specifically, the plano-concave cylindrical lens 3 and the convex plano-cylindrical lens 4 are fixed on the first packaging sleeve in a manner of ultraviolet curing glue or laser welding; the laser light source 2 is mounted on the first packaging sleeve 61 through the copper base 1, and if the copper base is mounted in a screw fixing mode, the copper base can conduct heat generated by the laser light source to the radiator. The second encapsulation tube 62 is used for mounting the coupling lens 5, such as mounting an aspherical lens directly in the second encapsulation sleeve 62. The optical fiber 8 is connected to the second packaging sleeve 62 through the quartz sleeve 7, for example, the quartz sleeve 7 tightly connects the optical fiber 8 to the second packaging tube 62 under the action of the ultraviolet curing adhesive. The first packaging tube 61 is connected to the second packaging tube 62, for example, by screw fastening.
After light emitted by the laser light source passes through the self-contained collimating lens, the divergence angle of the fast axis and the slow axis is still very large, so after beam expanding and collimating are carried out through two lenses of the beam expanding and collimating lens group, the divergence angle of the slow axis is reduced, light beam spots after coupling through the aspheric lens meet the coupling condition, namely the actual light spots are smaller than the diameter of an optical fiber core, and the light incidence angle is smaller than the numerical aperture. In this way, the beam can be coupled into the fiber efficiently.
The utility model discloses utilize above-mentioned system to adjust the coupling light beam, under an embodiment, expand the beam collimating lens group and satisfy following focal length adjustment constraint condition:
wherein the content of the first and second substances,andrespectively representing the probability distributions obeyed by the light source slow-axis width and divergence angle,representing the form of the outgoing ray vector field after the selected light source is acted by the beam expanding and collimating lens group, ，representing an optical operator, n1, n2 are refractive indexes, r1, r2 are free-form surface curvature radii;is a light distribution curve of a light source,the light source is selected to satisfy the maximum probability values of the slow axis width and the divergence angle.
In actual operation, the probability distribution of the light emitting characteristics of the light source is obtained by testing a large number of light sources, and the light source with the highest probability (such as 0.6mm of slow axis width, 0.8 degree of divergence angle and natural collimation of fast axis) is used as a referenceThe focal length and the curvature radius of the expanded beam collimating lens group are solved. The beam expanding collimation on the slow axis can reduce the influence caused by the width and divergence angle errors, so that the coupling lens can achieve a good convergence effect. If the light rays are completely collimated and emitted, the focal length and the curvature radius of the beam expanding and collimating lens group can be obtained through the equation set.
The fast axis of the light source has various forms of divergence angles, which can be roughly divided into several types of divergence, collimation, convergence and the like, if the fast axis is finely divided into 0.5 ~ 0.3.3, 0.3 ~ 0.1.1, 0.1 ~ -0.1-0.1 ~ -0.3 and the like, the proportion of light in different forms of divergence angles to the total light beam is different, the light with the highest proportion is taken as a standard to determine the focal length of the lens, and the coupling effect is best.
Under the adjustment, the proper focal length can improve the coupling efficiency according to the intersection of the focusing ranges of the fast and slow axes.
The utility model discloses utilize above-mentioned system to adjust another embodiment of coupling light beam, coupling lens satisfies the design constraint condition that imaging optics and non-imaging optics combine:
wherein the content of the first and second substances,indicating that the angle of the light rays after coupling through the lens satisfies the numerical aperture,which is indicative of the fiber coupling condition,representing the coupled light vector field,denotes an optical operator, n is a refractive index, M1, M2 is a free-form surface,indicating that the coupling lens satisfies the focal length equation and the spherical aberration minimum relationship.
In an actual coupling system, the position of the beam waist (minimum light spot) of the fast axis passing through the coupling lens is completely determined by the light source, and in order to achieve strong adaptability and generally high coupling efficiency, the relative position of the beam expanding and collimating lens group needs to be regulated and controlled to enable the position of the beam waist of the slow axis passing through the coupling lens to coincide with the position of the beam waist of the fast axis. For example, the fast axis is a converging type, and the beam waist position of the fast axis after passing through the coupling lens is in the focal distance, so that the beam waist needs to be enlarged to a proper distance by the beam expanding collimating lens group, the emergent light of the slow axis is in a converging form, the beam waist of the slow axis can coincide with the fast axis after passing through the coupling lens, and the coupling efficiency is highest at the moment. If the fast axis is divergent, the process is reversed, but there is substantially no deviation in coupling efficiency.
Because the slow axis optimization is realized by the lens group, the adjustable freedom degree is more, the beam waist coincidence of the fast axis and the slow axis can be realized by adjusting the positions of the lenses aiming at different light sources, and the coupling efficiency of different light sources can be consistent. The coupling mode of the multi-lens combination can expand the application range of the lens by regulating and controlling a plurality of degrees of freedom such as the position angle of the lens and the like, and is suitable for light sources in all forms.
It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.
Claims (9)
1. An optical fiber coupling system is characterized by comprising a laser light source, a beam expanding collimating lens group, a coupling lens and an optical fiber; the beam expanding collimating lens group and the coupling lens are sequentially arranged between the laser light source and the optical fiber; and light rays emitted by the laser light source are subjected to slow-axis beam expanding collimation through the beam expanding and collimating lens group, and the light rays subjected to beam expanding collimation are converged on the end face of the optical fiber through the coupling lens.
2. A fiber coupling system according to claim 1, wherein the beam expanding collimating lens group comprises a plano-concave cylindrical lens, a convex plano-cylindrical lens; the plano-concave cylindrical lens and the convex plano-cylindrical lens are sequentially arranged between the laser light source and the coupling lens; the flat-concave cylindrical lens is used for performing slow-axis beam expansion on light rays emitted by the laser light source, the convex-flat cylindrical lens is used for performing slow-axis collimation on the light rays after beam expansion, and the light rays after beam expansion and collimation are converged on the end face of the optical fiber through the coupling lens.
3. A fiber coupling system according to claim 1, wherein the coupling lens is an aspheric lens.
4. A fiber coupling system according to claim 1, wherein the optical fiber is a multimode fiber having a core diameter of 62.5 or 105 μm; or the optical fiber is a quartz optical fiber with the core diameter larger than 105 microns.
5. The optical fiber coupling system according to claim 1, wherein the laser source, the beam expanding collimating lens group, and the coupling lens are coaxially aligned in optical path and adjusted to be aligned to the optical fiber, and are packaged together by a packaging sleeve to be cured, thereby forming a laser illumination device.
6. The fiber coupling system according to claim 5, wherein the encapsulating tube comprises a first encapsulating tube and a second encapsulating tube, the first encapsulating tube is used for encapsulating the laser source and the beam expanding and collimating lens group, the second encapsulating tube is used for installing the coupling lens, and the optical fiber is connected with the second encapsulating tube through a quartz tube; the first packaging tube is connected with the second packaging tube.
7. The fiber coupling system of claim 6, wherein the beam expanding collimating lens group is packaged in the first packaging tube by ultraviolet curing glue or laser welding.
8. A fiber optic coupling system according to claim 5, wherein the laser light source is mounted on the package sleeve by a copper base.
9. A fiber coupling system according to claim 1, wherein the laser source is a semiconductor laser with a dual-axis collimating lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920345096.3U CN209879066U (en) | 2019-03-19 | 2019-03-19 | Optical fiber coupling system |
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| CN201920345096.3U CN209879066U (en) | 2019-03-19 | 2019-03-19 | Optical fiber coupling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109917521A (en) * | 2019-03-19 | 2019-06-21 | 浙江光塔节能科技有限公司 | A kind of fiber coupling system, coupling light beam regulation method |
| CN116560019A (en) * | 2023-07-11 | 2023-08-08 | 中天通信技术有限公司 | Dual-lens coupling method for optical module transmitting assembly and related equipment |
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2019
- 2019-03-19 CN CN201920345096.3U patent/CN209879066U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109917521A (en) * | 2019-03-19 | 2019-06-21 | 浙江光塔节能科技有限公司 | A kind of fiber coupling system, coupling light beam regulation method |
| CN109917521B (en) * | 2019-03-19 | 2023-11-24 | 浙江光塔安全科技有限公司 | Optical fiber coupling system and coupling light beam adjusting method |
| CN116560019A (en) * | 2023-07-11 | 2023-08-08 | 中天通信技术有限公司 | Dual-lens coupling method for optical module transmitting assembly and related equipment |
| CN116560019B (en) * | 2023-07-11 | 2023-09-19 | 中天通信技术有限公司 | Dual-lens coupling method for optical module transmitting assembly and related equipment |
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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. |