CN212060648U - Orthogonal coupling light path - Google Patents

Orthogonal coupling light path Download PDF

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CN212060648U
CN212060648U CN202020838969.7U CN202020838969U CN212060648U CN 212060648 U CN212060648 U CN 212060648U CN 202020838969 U CN202020838969 U CN 202020838969U CN 212060648 U CN212060648 U CN 212060648U
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laser
lens
cylindrical
optical fiber
convex
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谢刚
尹秀华
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Hangzhou Yiquan Photoelectric Co ltd
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Hangzhou Yiquan Photoelectric Co ltd
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Abstract

The utility model relates to an orthogonal coupling light path, which comprises a laser, an aspheric lens, a first cylindrical lens, a second cylindrical lens and an optical fiber which are arranged in sequence; 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 utility model discloses an orthogonal coupling light path has avoided using the fast axle collimating lens of expensive aspheric surface, and the cost is reduced has higher coupling efficiency.

Description

Orthogonal coupling light path
Technical Field
The utility model relates to a laser technical field especially relates to an orthogonal coupling light 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.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem that prior art exists, a quadrature coupling light path design is proposed.
The utility model discloses a can realize through following technical scheme:
the utility model provides an orthogonal coupling light path, including laser instrument, aspheric lens, first cylindrical mirror, second cylindrical mirror, the optic fibre that sets gradually; 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:
Figure 864865DEST_PATH_IMAGE002
the utility model discloses following beneficial effect has.
1. The utility model discloses an orthogonal coupling light path has avoided using the fast axle collimating lens of expensive aspheric surface, the cost is reduced.
2. The utility model discloses an orthogonal coupling light path can advance optic fibre with the laser efficient coupling of semiconductor laser output, realizes the efficiency more than 80%.
Description of the drawings.
Fig. 1 is the structure diagram of the orthogonal coupling optical path of the present invention.
Fig. 2 is a schematic diagram of the orthogonal coupling optical path 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.
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 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 (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:
Figure 627769DEST_PATH_IMAGE002
CN202020838969.7U 2020-05-19 2020-05-19 Orthogonal coupling light path Active CN212060648U (en)

Priority Applications (1)

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Applications Claiming Priority (1)

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Publications (1)

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Country Status (1)

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Denomination of utility model: An orthogonal coupled optical path

Granted publication date: 20201201

Pledgee: Hangzhou United Rural Commercial Bank Limited by Share Ltd. Baoshan Branch

Pledgor: Hangzhou Yiquan photoelectric Co.,Ltd.

Registration number: Y2024980007023

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