CN209961905U - Laser radar transmitting system - Google Patents
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- CN209961905U CN209961905U CN201920327680.6U CN201920327680U CN209961905U CN 209961905 U CN209961905 U CN 209961905U CN 201920327680 U CN201920327680 U CN 201920327680U CN 209961905 U CN209961905 U CN 209961905U
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Abstract
The utility model relates to a laser radar transmitting system, this system includes: the laser comprises a semiconductor laser, a graded index lens and a spherical mirror collimating lens combination, wherein the graded index lens and the spherical mirror collimating lens combination are lens combinations which are rotationally symmetrical along a main optical axis, and the semiconductor laser is used for emitting laser beams; the graded index lens is used for adjusting the laser beam emitted by the semiconductor laser, so that the difference value between the fast axis divergence angle and the slow axis divergence angle of the laser beam is smaller than a preset divergence angle threshold value, and the difference value between the fast axis emergent aperture and the slow axis emergent aperture of the laser beam is smaller than a preset aperture threshold value; the spherical mirror collimation lens combination is used for collimating the laser beam output by the graded index lens. The transmitting system can simplify the assembling process, save the space of the laser radar transmitting system while ensuring that the emergent light beam with smaller divergence angle is finally obtained, and also greatly reduce the cost of the laser radar transmitting system.
Description
Technical Field
The utility model relates to a laser radar field especially relates to a laser radar transmitting system.
Background
With the development of laser radars, the requirements on laser radar transmitting systems are higher and higher, and the production cost of the laser radar transmitting systems is also required to be reduced while the energy efficiency of the laser radar transmitting systems is required to be improved. In the traditional laser radar transmitting system, some optical fiber coupling lasers are used, and some semiconductor lasers are directly used.
The emergent light spot of the semiconductor laser is an elliptical light spot with a fast axis and a slow axis, an end face light beam can be directly used, and meanwhile, the light beams with different sizes and different emitting angles in the fast axis and slow axis directions need to be collimated. In the prior art, the beam emitted by the semiconductor laser is collimated by using the cylindrical mirror combination, but the collimation by using the cylindrical mirror combination has extremely high requirements on the consistency of the optical axis and the correction directivity of the cylindrical mirror in the assembly process, and the assembly process is relatively complex.
Therefore, the conventional laser radar transmitting system has a problem of difficulty in assembly.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to provide a laser radar transmission system aiming at the problem that the conventional laser radar transmission system has difficulty in assembly.
A lidar transmission system comprising: the optical fiber laser comprises a semiconductor laser, a graded index lens and a spherical mirror collimating lens combination, wherein the graded index lens and the spherical mirror collimating lens combination are lens combinations which are rotationally symmetrical along a main optical axis, the graded index lens is positioned on an emergent light path of the semiconductor laser, and the spherical mirror collimating lens combination is positioned on the emergent light path of the graded index lens; wherein,
the semiconductor laser is used for emitting laser beams;
the graded index lens is used for adjusting the laser beam emitted by the semiconductor laser, so that the difference value between the fast axis divergence angle and the slow axis divergence angle of the laser beam is smaller than a preset divergence angle threshold value, and the difference value between the fast axis exit aperture and the slow axis exit aperture of the laser beam is smaller than a preset aperture threshold value;
and the spherical mirror collimation lens combination is used for collimating the laser beam output by the graded index lens.
In one embodiment, the semiconductor laser is located in a focal region of the graded index lens.
In one embodiment, the graded index lens is located in a focal region of the spherical mirror collimating lens combination.
In one embodiment, the graded index lens comprises at least two graded index lenses.
In one embodiment, the graded index lens is a cylindrical lens.
In one embodiment, the distance between the cylindrical lenses is zero.
In one embodiment, the refractive index of the graded index lens is determined according to refractive index adjustment parameters including a fast axis adjustment parameter and a slow axis adjustment parameter.
In one embodiment, the fast axis adjustment parameter is determined according to a fast axis divergence angle and a fast axis exit aperture of the laser beam.
In one embodiment, the slow-axis adjustment parameter is determined based on a slow-axis divergence angle of the laser beam and a slow-axis exit aperture.
In one embodiment, the spherical mirror collimating lens combination comprises a front spherical mirror combination and a rear spherical mirror combination; the front spherical mirror combination is used for diverging the laser beam output by the graded index lens, and the rear spherical mirror combination is used for collimating the laser beam diverged by the front spherical mirror combination.
The laser radar transmitting system provided by the embodiment comprises a semiconductor laser, a graded index lens and a spherical mirror collimating lens combination, wherein the graded index lens and the spherical mirror collimating lens combination are both lens combinations which are rotationally symmetrical along a main optical axis, the graded index lens is positioned on an emergent light path of the semiconductor laser, and the spherical mirror collimating lens combination is positioned on the emergent light path of the graded index lens; the semiconductor laser is used for emitting laser beams; the graded index lens is used for adjusting a laser beam emitted by the semiconductor laser, so that the difference value between the fast axis divergence angle and the slow axis divergence angle of the laser beam is smaller than a preset divergence angle threshold value, and the difference value between the fast axis exit aperture and the slow axis exit aperture of the laser beam is smaller than a preset aperture threshold value; and the spherical mirror collimation lens combination is used for collimating the laser beam output by the graded index lens. In the laser radar transmitting system, the combination of the graded index lens and the spherical mirror collimating lens is a system which is in central rotational symmetry along the main optical axis, so that the problem of consistency of the optical axis is not required to be considered, the design tolerance of the combination of the graded index lens and the spherical mirror collimating lens can be ensured by directly designing the structure of the combination of the graded index lens and the spherical mirror collimating lens, and the assembling process is further simplified; in addition, the laser radar transmitting system can save the space of the laser radar transmitting system and greatly reduce the cost of the laser radar transmitting system while ensuring that the emergent light beam with a smaller divergence angle is finally obtained.
Drawings
FIG. 1 is a schematic diagram of a lidar transmission system provided in one embodiment;
FIG. 2 is a schematic diagram of a lidar transmission system in a Y-Z cross-section according to one embodiment;
FIG. 3 is a schematic diagram of a lidar transmission system in cross-section X-Z according to one embodiment.
Description of reference numerals:
a laser radar transmission system 10; a semiconductor laser 100;
a graded index lens 200; a spherical mirror collimating lens assembly 300;
a front spherical mirror assembly 301; a rear spherical mirror assembly 302.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The traditional laser radar transmitting system collimates the light beam emitted by the semiconductor laser by using the cylindrical mirror combination, and has the problems of complex assembling process and difficult assembling. Therefore, the embodiment of the application provides a laser radar transmitting system, and aims to solve the above technical problems of the conventional technology.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic diagram of a lidar transmission system according to an embodiment. Fig. 2 is a schematic diagram of a lidar transmission system in a Y-Z cross-section according to an embodiment. FIG. 3 is a schematic diagram of a lidar transmission system in cross-section X-Z according to one embodiment. As shown in fig. 1, lidar transmission system 10 includes: the refractive index gradient lens system comprises a semiconductor laser 100, a graded index lens 200 and a spherical mirror collimating lens combination 300, wherein the graded index lens 200 and the spherical mirror collimating lens combination 300 are both lens combinations which are in central rotational symmetry along a main optical axis, the graded index lens 200 is positioned on an emergent light path of the semiconductor laser 100, and the spherical mirror collimating lens combination 300 is positioned on the emergent light path of the graded index lens 200; the semiconductor laser 100 is used for emitting a laser beam; the graded index lens 200 is configured to adjust a laser beam emitted by the semiconductor laser 100, so that a difference between a fast axis divergence angle and a slow axis divergence angle of the laser beam is smaller than a preset divergence angle threshold, and a difference between a fast axis exit aperture and a slow axis exit aperture of the laser beam is smaller than a preset aperture threshold; the spherical mirror collimating lens assembly 300 is configured to collimate the laser beam output by the graded index lens 200.
Specifically, the semiconductor laser 100 is also called a laser diode, and is configured to emit a laser beam, where a spot of the emitted laser beam is an elliptical spot having a fast axis and a slow axis, and an end beam of the elliptical spot can be directly used, but at the same time, beams having different sizes and different divergence angles in the fast axis direction need to be collimated, as shown in fig. 2, a cross-sectional view of the elliptical spot shows a divergence angle of the laser beam emitted by the semiconductor laser 100 in the fast axis direction, as shown in fig. 3, a cross-sectional view of the elliptical spot shows a divergence angle of the laser beam emitted by the semiconductor laser 100 in the slow axis direction, and as shown in fig. 2 and 3, a difference between a divergence angle of the laser beam emitted by the semiconductor laser 100 in the fast axis direction and a divergence angle of the laser beam emitted by the slow axis direction is large, a divergence angle of.
The graded-index lens 200 is a lens that is rotationally symmetric about a main optical axis, and is also called a self-focusing lens, and is a cylindrical optical lens with a refractive index distribution that gradually changes along a radial direction, and is located on an exit light path of the semiconductor laser 100, and is used for adjusting a laser beam emitted by the semiconductor laser 100, so that a difference between a fast-axis divergence angle and a slow-axis divergence angle of the laser beam is smaller than a preset divergence angle threshold, and a difference between a fast-axis exit aperture and a slow-axis exit aperture of the laser beam is smaller than a preset aperture threshold. The graded index lens 200 adjusts the laser beam emitted by the semiconductor laser 100 by changing the refractive index of the graded index lens, so that the difference between the fast axis divergence angle and the slow axis divergence angle of the laser beam is smaller than a preset divergence angle threshold, and the difference between the fast axis exit aperture and the slow axis exit aperture of the laser beam is smaller than a preset aperture threshold. That is, the graded index lens 200 aligns the fast axis divergence angle and the slow axis divergence angle of the laser beam to be close and aligns the fast axis exit aperture and the slow axis exit aperture of the laser beam to be close.
The spherical mirror collimating lens assembly 300 is a lens assembly that is rotationally symmetric about the main optical axis and is used for collimating the laser beam output by the graded index lens 200. Optionally, as shown in fig. 2, the spherical mirror collimating lens assembly 300 includes a front spherical mirror assembly 301 and a rear spherical mirror assembly 302, where the front spherical mirror assembly 301 is configured to diverge the laser beam output by the graded index lens 200, and the rear spherical mirror assembly 302 is configured to collimate the laser beam diverged by the front spherical mirror assembly; the front spherical mirror assembly 301 includes at least one front spherical mirror, and the curvature radius of each front spherical mirror is changed from large to small, and the rear spherical mirror assembly 302 includes at least one rear spherical mirror, and the curvature radius of each rear spherical mirror is changed from small to large.
In the embodiment, the laser radar transmitting system comprises a semiconductor laser, a graded index lens and a spherical mirror collimating lens combination, and the graded index lens and the spherical mirror collimating lens combination are both systems which are rotationally symmetrical along a main optical axis, so that the problem of consistency of the optical axis is not required to be considered, the design tolerance of the graded index lens and the spherical mirror collimating lens combination can be ensured by directly designing the structure of the graded index lens and the spherical mirror collimating lens combination, and the assembling process is simplified; in addition, the laser radar transmitting system can save the space of the laser radar transmitting system and greatly reduce the cost of the laser radar transmitting system while ensuring that the emergent light beam with a smaller divergence angle is finally obtained.
With continued reference to fig. 2, based on the above embodiment, as an alternative implementation, the semiconductor laser 100 is located in the focal region of the graded index lens 200.
Specifically, as shown in fig. 2, the semiconductor laser 100 is located in the focal region of the graded index lens 200. The focal region of the graded index lens 200 is a converging region of the laser beam emitted from the semiconductor laser 100 after being refracted by the graded index lens 200. In this embodiment, the semiconductor laser is located in the focal region of the graded index lens, and the graded index lens is a system that is rotationally symmetric about the central axis of the main light, so that the problem of consistency of the optical axis is not required to be considered, the design tolerance of the graded index lens can be guaranteed by directly designing the structure of the graded index lens, and the assembly process is simplified.
With continued reference to fig. 2, based on the above embodiment, as an alternative implementation, the graded index lens 200 is located in the focal region of the spherical mirror collimating lens assembly 300.
Specifically, as shown in fig. 2, the graded index lens 200 is located in the focal region of the spherical mirror collimating lens assembly 300. The focal region of the spherical mirror collimating lens assembly 300 is the converging region of the laser beam output by the graded index lens 200 after being reflected by the spherical mirror collimating lens assembly 300. In this embodiment, the graded index lens is located in the focal region of the spherical mirror collimating lens assembly, and the spherical mirror collimating lens assembly is a system that is rotationally symmetric around the main optical axis, so that the problem of consistency of the optical axis does not need to be considered, the design tolerance of the spherical mirror collimating lens assembly can be ensured by directly designing the structure of the spherical mirror collimating lens assembly, and the assembly process is simplified.
On the basis of the above embodiment, as an optional implementation manner, the graded index lens 200 includes at least two graded index lenses 201.
Specifically, the graded index lens 200 includes at least two graded index lenses 201. Optionally, the graded index lens 201 is a cylindrical lens. Optionally, the distance between the cylindrical lenses is zero, that is, the adjacent cylindrical lenses are of seamless structure and are adjacent to each other. Alternatively, the cylindrical lens may be a cylindrical lens whose end face radius is infinite.
In this embodiment, the graded index lens includes at least two graded index lenses, which can simplify the design of the graded index lens, save the space occupied by the graded index lens, and reduce the cost of the graded index lens.
On the basis of the above embodiment, as an optional implementation manner, the refractive index of the graded index lens 200 is determined according to refractive index adjustment parameters, and the refractive index adjustment parameters include a fast axis adjustment parameter and a slow axis adjustment parameter.
Specifically, the refractive index of the graded index lens 200 is determined according to refractive index adjustment parameters, which include a fast axis adjustment parameter and a slow axis adjustment parameter. Optionally, the fast axis adjustment parameter is determined according to the fast axis divergence angle and the fast axis exit aperture of the laser beamThe slow axis adjustment parameter is determined based on the slow axis divergence angle of the laser beam and the slow axis exit aperture. Alternatively, the refractive index of the graded index lens 200 may be n according to a predetermined refractive index formula0+nx1x+nx2x2+ny1y+ny2y2+nz1z+nz2z is determined where n is the refractive index of the GRIN lens 200 and n0,nx1,nx2,ny1,ny2,nz1,nz2For the refractive index adjustment parameter, x denotes a fast axis exit aperture of the laser beam emitted by the semiconductor laser 100, y denotes a slow axis exit aperture of the laser beam emitted by the semiconductor laser 100, and z denotes a propagation direction of the laser beam emitted by the semiconductor laser 100.
In this embodiment, the refractive index of the graded index lens is determined according to the refractive index adjustment parameter, and the refractive index adjustment parameter includes a fast axis adjustment parameter and a slow axis adjustment parameter, so that the refractive index determined according to the fast axis adjustment parameter and the slow axis adjustment parameter can improve the processing effect on the laser beam emitted by the semiconductor laser, so that the fast axis divergence angle and the slow axis divergence angle of the laser beam are adjusted to be close, and the fast axis exit aperture and the slow axis exit aperture of the laser beam are adjusted to be close.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A lidar transmission system, the system comprising: the optical fiber laser comprises a semiconductor laser, a graded index lens and a spherical mirror collimating lens combination, wherein the graded index lens and the spherical mirror collimating lens combination are lens combinations which are rotationally symmetrical along a main optical axis, the graded index lens is positioned on an emergent light path of the semiconductor laser, and the spherical mirror collimating lens combination is positioned on the emergent light path of the graded index lens; wherein,
the semiconductor laser is used for emitting laser beams;
the graded index lens is used for adjusting the laser beam emitted by the semiconductor laser, so that the difference value between the fast axis divergence angle and the slow axis divergence angle of the laser beam is smaller than a preset divergence angle threshold value, and the difference value between the fast axis exit aperture and the slow axis exit aperture of the laser beam is smaller than a preset aperture threshold value;
and the spherical mirror collimation lens combination is used for collimating the laser beam output by the graded index lens.
2. The system of claim 1, wherein the semiconductor laser is located in a focal region of the graded index lens.
3. The system of claim 1, wherein the graded index lens is located in a focal region of the spherical mirror collimating lens combination.
4. The system of claim 3, wherein the graded index lens comprises at least two graded index lenses.
5. The system of claim 4, wherein the graded index lens is a cylindrical lens.
6. The system of claim 5, wherein the cylindrical lenses have a zero pitch therebetween.
7. The system of claim 6, wherein the refractive index of the graded index lens is determined according to refractive index adjustment parameters, the refractive index adjustment parameters including a fast axis adjustment parameter and a slow axis adjustment parameter.
8. The system of claim 7, wherein the fast axis adjustment parameter is determined based on a fast axis divergence angle and a fast axis exit aperture of the laser beam.
9. The system of claim 7, wherein the slow-axis adjustment parameter is determined based on a slow-axis divergence angle and a slow-axis exit aperture of the laser beam.
10. The system of claim 1, wherein the spherical mirror collimating lens combination comprises a front spherical mirror combination and a rear spherical mirror combination; the front spherical mirror combination is used for diverging the laser beam output by the graded index lens, and the rear spherical mirror combination is used for collimating the laser beam diverged by the front spherical mirror combination.
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| CN201920327680.6U CN209961905U (en) | 2019-03-15 | 2019-03-15 | Laser radar transmitting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946678A (en) * | 2019-03-15 | 2019-06-28 | 深圳市速腾聚创科技有限公司 | Laser radar emission system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109946678A (en) * | 2019-03-15 | 2019-06-28 | 深圳市速腾聚创科技有限公司 | Laser radar emission system and method |
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