CN111458814A - Orthogonal coupling light path - Google Patents
Orthogonal coupling light path Download PDFInfo
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- CN111458814A CN111458814A CN202010425543.3A CN202010425543A CN111458814A CN 111458814 A CN111458814 A CN 111458814A CN 202010425543 A CN202010425543 A CN 202010425543A CN 111458814 A CN111458814 A CN 111458814A
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- laser
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- cylindrical
- optical path
- optical fiber
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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
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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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
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0966—Cylindrical lenses
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention relates to an orthogonal coupling optical path, which comprises a laser, an aspheric lens, a first cylindrical lens, a second cylindrical lens and an optical fiber, wherein the laser, the aspheric lens, the first cylindrical lens, the second cylindrical lens and the optical fiber are sequentially arranged; laser emitted by the laser device is collimated by the aspheric lens in the fast axis mode, and then enters the optical fiber through the first cylindrical mirror and the second cylindrical mirror which are arranged in an orthogonal mode in a focusing mode. The orthogonal coupling optical path avoids using an expensive aspheric fast axis collimating lens, reduces the cost and has higher coupling efficiency.
Description
Technical Field
The invention relates to the technical field of laser, in particular to an orthogonal coupling optical path.
Background
Coupling laser light into an optical fiber is a widely used technique. For example, the well-known optical fiber communication is that laser is coupled into an optical fiber for long-distance transmission communication. The solid-state laser beam is relatively easy to couple into the optical fiber because of its good quality. However, semiconductor lasers have serious astigmatism due to their intrinsic characteristics, and have large differences in beam quality and divergence angle between the fast axis and the slow axis, and thus require special optical design for efficient coupling to optical fibers.
Traditionally, there are a number of ways to couple semiconductor lasers into optical fibers:
1. the optical fiber rancour is directly arranged near the light emitting point of the semiconductor laser, the structure is very simple and compact, but the coupling efficiency is generally not more than 50%;
2. on the basis of 1, the coupling efficiency can be improved to 60-70% by a micro lens or by grinding the end face of the optical fiber into a micro spherical surface or a double wedge surface;
3. the high-power system uses a micro-lens array or an aspheric cylindrical lens (a fast axis collimating lens) for collimation, and then is matched with light path designs such as a step lens and the like, so that higher efficiency (more than 80%) can be obtained.
4. For a single-point semiconductor laser, a method of 'fast axis collimating mirror + slow axis collimating mirror + aspheric lens' is used, so that the coupling efficiency can be more than 80%.
The methods 1 and 2 are suitable for coupling the small-power laser to the small-core optical fiber. Although the coupling efficiency is not high, the coupling efficiency is greatly used in optical fiber communication or low-power laser coupling due to the large market size, low laser cost and simple and compact structure and easy production.
The 3 rd method is suitable for coupling high-power laser to optical fiber with larger core diameter. Although the price of the devices such as the micro-lens array, the fast axis collimating mirror, the step mirror and the like is not good, the application scene of the device is mainly oriented to a high-power laser system, and the whole system is very expensive, so that the device is not sensitive to the cost of individual devices.
However, in some special applications, such as long-range laser illumination, the coupling efficiency is sensitive to the overall system cost because semiconductor lasers are relatively expensive. Also, due to the long transmission distances, it is desirable to minimize the core diameter of the fiber to reduce the cost of the fiber. Technically, the method 4 is the simplest method, but the fast axis collimator lens is an aspherical cylindrical lens, which is very costly. Therefore, it is necessary to efficiently couple a semiconductor laser of high power into an optical fiber of a small core diameter for transmission and to reduce the cost as much as possible.
Disclosure of Invention
The invention provides a design of an orthogonal coupling optical path aiming at the problems in the prior art.
The invention is realized by the following technical scheme:
the orthogonal coupling optical path provided by the invention comprises a laser, an aspheric lens, a first cylindrical lens, a second cylindrical lens and an optical fiber which are sequentially arranged; laser emitted by the laser device is collimated by the aspheric lens in the fast axis mode, and then enters the optical fiber through the first cylindrical mirror and the second cylindrical mirror which are arranged in an orthogonal mode in a focusing mode.
The laser is a semiconductor laser emitting light in a single point or double points; and when the laser emits light in double points, the total length of the light emitting area is not more than 300 mu m.
Preferably, the aspheric lens has a plano-convex structure or a biconvex structure, and at least one convex surface is an odd-order aspheric surface or an even-order aspheric surface.
Preferably, the aspheric lens has an effective focal length of 1.5mm to 12 mm.
Preferably, the laser light-emitting point is arranged on the focal plane of the aspheric lens, and the collimated laser fast axis far field divergence angle is smaller than 1 °.
Preferably, the aspheric lens is integrally packaged with the laser or is independently arranged outside the laser packaging structure.
Preferably, the first cylindrical lens is a plano-convex cylindrical lens or a biconvex cylindrical lens, and the refractive direction of the convex cylindrical surface is arranged in the fast axis direction of the laser; when the first cylindrical mirror is of a plano-convex structure, the passing sequence of the laser is as follows: first through the convex surface and then through the flat surface.
Preferably, the effective focal length of the first cylindrical mirror is 6mm to 50 mm.
Preferably, the second cylindrical lens is a plano-convex cylindrical lens or a biconvex cylindrical lens, and the refractive direction of the convex cylindrical surface is arranged in the slow axis direction of the laser; when the second cylindrical lens is of a plano-convex structure, the passing sequence of the laser is as follows: first through the convex surface and then through the flat surface.
Preferably, the effective focal length of the second cylindrical lens is 1.5mm to 10 mm.
Preferably, a focal point of the laser light in the fast axis direction via the first cylindrical mirror and a focal point of the laser light in the slow axis direction via the second cylindrical mirror are both provided on the end face of the optical fiber.
Preferably, the optical fiber is a silica optical fiber having a core diameter of 20 μm to 400 μm.
Preferably, the aspheric lens, the first cylindrical mirror and the second cylindrical mirror are made of optical glass or quartz.
Preferably, the length of the light emitting region of the laserlFast axis divergence angleθ Fast-acting toy (half angle), slow axis divergence angleθ Slow (half angle), core diameter of the optical fiberdAnd a numerical apertureNAFocal length of the aspherical lensf 1 A focal length of the first cylindrical mirrorf Column 1 And the focal length of the second cylindrical lensf Column 2 Satisfies the relationship:
the present invention has the following advantageous effects.
1. The orthogonal coupling optical path avoids using an expensive aspheric fast axis collimating lens and reduces the cost.
2. The orthogonal coupling optical path can efficiently couple laser output by the semiconductor laser into the optical fiber, and achieves the efficiency of more than 80%.
Drawings
Fig. 1 is a diagram showing the structure of the orthogonal coupling optical path of the present invention.
FIG. 2 is a schematic diagram of the quadrature coupling optical path of the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example 1.
The orthogonal coupling optical path comprises a laser 1, an aspheric lens 2, a first cylindrical lens 3, a second cylindrical lens 4 and an optical fiber 5 which are sequentially arranged; laser emitted by the laser 1 is collimated by the aspheric lens 2 in a fast axis mode, and then sequentially enters the optical fiber through the first cylindrical lens 3 and the second cylindrical lens 4 which are arranged in an orthogonal mode in a focusing mode.
The laser is a single-point light-emitting semiconductor laser, the length of a light-emitting area is 75um, and the output power is 2W; the aspheric lens is a plano-convex aspheric surface, and the focal length is 4 mm; the focal length of the first cylindrical mirror is 20mm, and the refraction direction is arranged in the fast axis direction of the laser; the focal length of the second cylindrical lens is 4mm, and the refraction direction is arranged in the slow axis direction of the laser; the diameter of the quartz optical fiber core is 100 μm. After debugging, the optical fiber is coupled and output 1.7W, and the coupling efficiency is 85 percent.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (10)
1. An orthogonal coupling optical path is characterized by comprising a laser, an aspheric lens, a first cylindrical lens, a second cylindrical lens and an optical fiber which are sequentially arranged; laser emitted by the laser device is collimated by the aspheric lens in the fast axis mode, and then enters the optical fiber through the first cylindrical mirror and the second cylindrical mirror which are arranged in an orthogonal mode in a focusing mode.
2. The orthogonal coupling optical path according to claim 1, wherein the laser is a single-point or double-point light emitting semiconductor laser; and when the laser emits light in double points, the total length of the light emitting area is not more than 300 mu m.
3. The orthogonal coupling optical path according to claim 1, wherein the aspheric lens has a plano-convex structure or a biconvex structure, and at least one convex surface is an odd-order aspheric surface or an even-order aspheric surface.
4. The quadrature coupled optical path of claim 1, wherein the aspheric lens has an effective focal length of 1.5mm to 12 mm; the effective focal length of the first cylindrical mirror is 6mm-50 mm; the effective focal length of the second cylindrical lens is 1.5mm-10 mm.
5. The orthogonal coupling optical path according to claim 1, wherein the laser light emitting point is arranged on the focal plane of the aspheric lens, and the collimated laser light has a fast-axis far-field divergence angle smaller than 1 °.
6. The orthogonal coupling optical path according to claim 1, wherein the aspheric lens is integrally packaged with the laser or is independently arranged outside a laser packaging structure; the optical fiber is a quartz optical fiber with the core diameter of 20-400 μm; the aspheric lens, the first cylindrical mirror and the second cylindrical mirror are made of optical glass or quartz.
7. The orthogonal coupling optical path according to claim 1, wherein the first cylindrical lens is a plano-convex cylindrical lens or a biconvex cylindrical lens, and the convex cylindrical refraction direction is arranged in the fast axis direction of the laser; when the first cylindrical mirror is of a plano-convex structure, the passing sequence of the laser is as follows: first through the convex surface and then through the flat surface.
8. The orthogonal coupling optical path according to claim 1, wherein the second cylindrical lens is a plano-convex cylindrical lens or a biconvex cylindrical lens, and the convex cylindrical refraction direction is arranged in the slow axis direction of the laser; when the second cylindrical lens is of a plano-convex structure, the passing sequence of the laser is as follows: first through the convex surface and then through the flat surface.
9. The orthogonal coupling optical path according to claim 1, wherein a focal point of the laser light in a fast axis direction via the first cylindrical mirror and a focal point of the laser light in a slow axis direction via the second cylindrical mirror are both provided on the end face of the optical fiber.
10. The quadrature-coupled optical circuit of claim 1, wherein the light emitting region length of the laserlFast axis divergence angleθ Fast-acting toy Slow axis divergence angleθ Slow All the divergence angles are half angles, and the core diameter of the optical fiberdAnd a numerical apertureNAFocal length of the aspherical lensf 1 A focal length of the first cylindrical mirrorf Column 1 And the focal length of the second cylindrical lensf Column 2 Satisfies the relationship:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010425543.3A CN111458814A (en) | 2020-05-19 | 2020-05-19 | Orthogonal coupling light path |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010425543.3A CN111458814A (en) | 2020-05-19 | 2020-05-19 | Orthogonal coupling light path |
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| CN111458814A true CN111458814A (en) | 2020-07-28 |
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| CN202010425543.3A Pending CN111458814A (en) | 2020-05-19 | 2020-05-19 | Orthogonal coupling light path |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112821194A (en) * | 2021-02-04 | 2021-05-18 | 无锡亮源激光技术有限公司 | High-performance linear laser |
| CN113091898A (en) * | 2021-03-04 | 2021-07-09 | 南京理工大学 | Laser beam quality measuring method based on scattered light imaging method |
| CN113898883A (en) * | 2021-10-20 | 2022-01-07 | 江苏亮点光电研究有限公司 | Laser lighting device |
-
2020
- 2020-05-19 CN CN202010425543.3A patent/CN111458814A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112821194A (en) * | 2021-02-04 | 2021-05-18 | 无锡亮源激光技术有限公司 | High-performance linear laser |
| CN113091898A (en) * | 2021-03-04 | 2021-07-09 | 南京理工大学 | Laser beam quality measuring method based on scattered light imaging method |
| CN113898883A (en) * | 2021-10-20 | 2022-01-07 | 江苏亮点光电研究有限公司 | Laser lighting device |
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