CN219143083U - Optical device and laser radar system - Google Patents
Optical device and laser radar system Download PDFInfo
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- CN219143083U CN219143083U CN202223022014.2U CN202223022014U CN219143083U CN 219143083 U CN219143083 U CN 219143083U CN 202223022014 U CN202223022014 U CN 202223022014U CN 219143083 U CN219143083 U CN 219143083U
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Abstract
The application provides an optical device and a laser radar system, which relate to the technical field of optics and comprise a base, a laser light source connected with the base and an optical module arranged on the base, wherein the optical module comprises at least two optical elements, and the laser light source emits light beams towards the optical module to form light spots; the optical device further comprises a compensation structure, at least two optical elements are fixed on the base along a first direction through the compensation structure so as to compensate the relative distance between the at least two optical elements along the optical axis direction, and the first direction is a direction insensitive to the divergence angle and the directivity index of the light spot. The compensation structure is used for compensating the distance change between at least two optical elements along the optical axis direction due to high and low temperature, so that the problem that the divergence angle is out of tolerance at high and low temperature is solved, and the base is prevented from being deformed greatly at high and low temperature to cause the directivity of the optical module to change greatly so as to influence the performance of the optical module.
Description
Technical Field
The present application relates to the field of optical technology, and in particular, to an optical device and a laser radar system.
Background
In designing a laser radar transmitting module, in order to realize the stability of divergence angle and directivity of laser beams at high and low temperatures, all optical components and semiconductor lasers are generally mounted on a base made of the same material. In this case, the choice of base material is relatively single and expensive. When at least two optical elements are arranged in the optical module, the distance change between the two optical elements in the optical module can directly influence the divergence angle and directivity of the laser beam, the base is generally made of aluminum alloy with high thermal expansion coefficient, and under the high-low temperature condition, the aluminum alloy base can generate larger thermal expansion quantity to cause larger change quantity of the distance between the two optical elements, so that the divergence angle and directivity of the laser beam are unstable.
Disclosure of Invention
The purpose of the application is to provide an optical device and a laser radar system, and aims to solve the technical problems of unstable divergence angle and directivity of laser beams caused by high-low temperature change in the prior art.
Embodiments of the present application are implemented as follows:
in one aspect of the present application, an optical device is provided, including a base, a laser light source connected to the base, and an optical module disposed on the base, where the optical module includes at least two optical elements, and the laser light source emits a light beam toward the optical module to form a light spot; the optical device further comprises a compensation structure, at least two optical elements are fixed on the base along a first direction through the compensation structure so as to compensate the relative distance between the at least two optical elements along the optical axis direction, and the first direction is a direction insensitive to the divergence angle and the directivity index of the light spots.
In one possible implementation, the compensation structure is a support member disposed corresponding to at least two of the optical elements, and the material of the support member is iron-nickel alloy or ceramic.
In one possible implementation, the compensation structure is a support member disposed in correspondence with at least two of the optical elements, the support member being formed by stamping a ceramic matrix composite sheet metal.
In one possible implementation, the compensation structure is a semiconductor refrigerator, the laser light source is disposed on a circuit board, the optical module is connected to the circuit board through the base, and the circuit board is connected to the semiconductor refrigerator.
In one possible implementation, the optical module is disposed on a light emitting side of the laser light source, the base and the laser light source are both located on one side of the circuit board, and the semiconductor refrigerator is located on the other side of the circuit board.
In one possible implementation, the laser light sources are all located on one side of the circuit board, the base and the semiconductor refrigerator are located on the other side of the circuit board, and a gap is formed between the base and the semiconductor refrigerator.
In one possible implementation, the laser light source is a multi-channel edge-emitting laser.
In a second aspect of the present application, there is provided a lidar system comprising the optical device described above.
The beneficial effects of this application include: the optical device and the laser radar system provided by the embodiment of the application comprise a base, a laser light source connected with the base, and an optical module arranged on the base, wherein the optical module comprises at least two optical elements, and the laser light source emits light beams towards the optical module to form light spots; the optical device further comprises a compensation structure, at least two optical elements are fixed on the base along a first direction through the compensation structure so as to compensate the relative distance between the at least two optical elements along the optical axis direction, and the first direction is a direction insensitive to the divergence angle and the directivity index of the light spot. The compensation structure is used for compensating the distance change between at least two optical elements along the optical axis direction due to high and low temperature, so that the problem that the divergence angle is out of tolerance at high and low temperature is solved, and the base is prevented from being deformed greatly at high and low temperature to cause the directivity of the optical module to change greatly so as to influence the performance of the optical module.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 to fig. 4 are schematic structural diagrams of four embodiments of compensation structures of an optical device according to an embodiment of the present application.
Icon: 10-a laser light source; 100-an optical module; 100 a-a base; 300-an optical element; 500-base; 501-a support; 502-a circuit board; 503-semiconductor refrigerator.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships that are conventionally put in use of the inventive product, are merely for convenience of description of the present application and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In order to realize the stability of the divergence angle and directivity of the laser beam at high and low temperatures, the embodiment of the application adopts materials or composite materials with lower thermal expansion coefficients (such as iron-nickel alloy, alumina ceramic, aluminum nitride ceramic, CMC, CPC and other composite materials) on the optical related parts influencing the divergence angle and directivity of the laser beam, matches the optical indexes to form an optical small module, and then is mounted on the base 500. By adopting the mode, the cost is increased by a small amount, and the divergence angle and the directivity of the laser beam are more stable under the high-low temperature condition.
Thus, referring to fig. 1, a first aspect of the embodiments of the present application provides an optical device, including a base 500 (fig. 3 and 4 are base 100 a) and a laser light source 10 connected to the base 500, and an optical module 100 disposed on the base 500, where the optical module 100 includes at least two optical elements 300, and the laser light source 10 emits a light beam toward the optical module 100 to form a light spot; wherein further the laser light source 10 is a multi-channel edge emitting laser.
The optical device further includes a compensation structure, through which at least two optical elements 300 are fixed on the base 500 along a first direction, to compensate for a relative distance between the at least two optical elements 300 along the optical axis direction, where the first direction is a direction insensitive to a divergence angle and a directivity index of the light spot.
The change of the distance between the at least two optical elements 300 directly affects the divergence angle and directivity of the laser beam, and when the material of the base 500 is an aluminum alloy with a high thermal expansion coefficient, under the high and low temperature conditions, the base 500 of the aluminum alloy generates a larger thermal expansion amount, so that the distance between the at least two optical elements 300 generates a larger change amount, and the divergence angle exceeds the tolerance, which means that the tolerance exceeds the tolerance range. Thus, by the compensation structure, the thermal conductivity variation of the base 500 is compensated for to reduce or avoid the problem of out-of-tolerance divergence angle.
Specifically, when the at least two optical elements 300 are fixed to the base 500 along the first direction by the compensation structure, for example, when the first direction is the fast axis direction, the at least two optical elements 300 are fixed to the base 500 along the fast axis direction by the compensation structure, and the compensation structure and the optical elements 300 on the compensation structure are not fixed in the slow axis direction, so when the base 500 is deformed, due to the fixing of the optical elements 300 to the compensation structure, the change of the distance between the at least two optical elements 300 in the optical axis direction caused by the deformation of the base 500 can be eliminated or reduced by the compensation structure, so that the deformation of the base 500 does not affect the change of the distance between the at least two optical elements 300 in the optical axis direction, and further the distance between the at least two optical elements 300 in the optical axis direction is not changed, so as to ensure that the divergence angle is not out of tolerance.
Therefore, in the optical device provided by the embodiment of the application, when at least two optical elements 300 in the optical module 100 are mounted on the base 500, and if the optical module 100 is sensitive to the divergence angle and the directivity index in the slow axis direction, the compensation structure is fixed on the base 500 along the fast axis direction (the first direction), and the at least two optical elements 300 are fixed on the base 500 along the fast axis direction through the compensation structure, so as to compensate the distance change between the at least two optical elements 300 in the optical axis direction, thereby not only solving the problem that the divergence angle is out of tolerance at high and low temperatures, but also preventing the base 500 from being greatly deformed at high and low temperatures to cause the larger variation of the directivity of the optical module 100 to affect the performance of the optical module 100, and solving the problem that the divergence angle is out of tolerance due to the distance change of the at least two optical elements 300, and improving the overall performance of the optical module 100.
It can be understood that if the optical module 100 is sensitive to the divergence angle and the directivity index of the slow axis direction, the compensation structure is fixed on the base 500 along the fast axis direction; if the optical module 100 is sensitive to the divergence angle and the directivity index in the fast axis direction, the compensation structure is fixed on the base 500 along the slow axis direction.
When the at least two optical elements 300 are fixed on the base 500 along the first direction by the compensation structure, taking two optical elements 300 as an example, in one implementation manner, as shown in fig. 1, the at least two optical elements 300 are fixed on the base 500 along the fast axis direction by the compensation structure, the compensation structure is a support 501 corresponding to the at least two optical elements 300, the compensation structure is a support 501, and the material of the support 501 is iron-nickel alloy or ceramic. The two optical elements 300 are fixed on the support 501 in the fast axis direction, the support 501 is fixed on the base 500 in the fast axis direction, and the support 501 and the two optical elements 300 on the support 501 are not fixed in the slow axis direction. The material of the support 501 has a low thermal expansion coefficient and is not easily deformed, and the two optical elements 300 are disposed on the support 501 so as to ensure that the distance between the two optical elements 300 in the optical axis direction is as unchanged as possible.
Further, the number of the supporting pieces 501 and the number of the optical elements 300 are correspondingly arranged, and one optical element 300 is correspondingly arranged on one supporting piece 501; it may also be that the support 501 is an integral body, and the optical module 100 is integrally disposed on one support 501.
The distance change between the two optical elements 300 in the optical axis direction is compensated by adopting an iron-nickel alloy piece or a ceramic piece processed by MIM (metal injection molding) or CIM (computer integrated manufacturing), so that the problem that the divergence angle is out of tolerance at high and low temperatures is solved, and the aluminum alloy base 500 is prevented from being deformed greatly at high and low temperatures, so that the module directivity is changed greatly. Since there is material compensation and the optical solution is sensitive to the slow axis direction index, the solution can be installed in the fast axis direction. The compensating structure is mounted to the base 500 by screws, glue or screws plus glue.
In another possible embodiment, the support 501 is formed by stamping from a ceramic matrix composite sheet metal as a compensating structure.
As shown in fig. 2, the principle is the same as the above embodiment. In contrast, the support 501 is obtained by sheet metal stamping, and is made of a composite material such as CMC (ceramic matrix composite) or CPC by hot pressing, and the support 501 is mounted on the light-passing surface of the base 500. The support 501 is mounted to the base 500 by screws, glue or screws + glue.
Compared with the method that the material of the base 500 is replaced by the material with low thermal expansion coefficient, the two optical elements 300 are arranged on the supporting piece 501 by adopting the material with low thermal expansion coefficient as the supporting piece 501, and the partial material adopts the material with low thermal expansion coefficient, so that the cost is lower, and the aim of solving the problem of the out-of-tolerance of the divergence angle is fulfilled.
As shown in fig. 3, in a third possible implementation, the compensation structure is a semiconductor refrigerator 503, the laser light source 10 is disposed on a circuit board 502, the optical module 100 is connected to the circuit board 502 through a base 100a, and the circuit board 502 is connected to the semiconductor refrigerator 503.
The optical module 100 is disposed on the base 100a, and the base 100a and the laser light source 10 are disposed on the semiconductor refrigerator 503 through the circuit board 502.
The optical module 100 and the base 100a are integrally disposed and mounted on the upper portion of the circuit board 502, and may be disposed on both sides of the laser light source 10 or may be disposed around the laser light source 10. And the installation is carried out by adopting a welding and cementing mode. The advantages are that: the optical module 100 and the laser source 10 are simultaneously controlled by the semiconductor refrigerator 503, so that the influence of the warpage of the circuit board 502 on the directivity in the first direction and the influence of the warpage of each rotation dimension of the structural member on the divergence angle in the first direction are relieved, and the optimization of the high-low temperature optical index drift is easier.
The optical module 100 is disposed on the light emitting side of the laser light source 10, the base 100a and the laser light source 10 are both located on one side of the circuit board 502, and the semiconductor refrigerator 503 is located on the other side of the circuit board 502.
Illustratively, in the first direction, the optical module 100 is located on one side of the circuit board 502 with a gap between the optical module 100 and the circuit board 502, the optical module 100 and the base 100a are integrally fixed, and in the direction perpendicular to the fast axis, the base 100a and the laser light source 10 are both located on one side of the circuit board 502, and the semiconductor refrigerator 503 is located on the other side of the circuit board 502.
As shown in fig. 4, in a fourth possible implementation manner, the compensation structure is a semiconductor refrigerator 503, along the first direction, the optical module 100 is located on one side of the circuit board 502 and has a gap with the circuit board 502, in the direction perpendicular to the first direction, the laser light sources 10 are all located on one side of the circuit board 502, the base 100a and the semiconductor refrigerator 503 are located on the other side of the circuit board 502, and a gap is formed between the base 100a and the semiconductor refrigerator 503.
The optical module 100 and the base 100a are integrally arranged and mounted at the bottom of the circuit board 502 in a welding and gluing mode. The advantages are that: the optical module 100 and the laser source 10 are simultaneously controlled by the semiconductor refrigerator 503, so that the influence of the warpage of the circuit board 502 on the directivity in the first direction and the influence of the warpage of each rotation dimension of the structural member on the divergence angle in the first direction are relieved, and the optimization of the high-low temperature optical index drift is easier.
When the semiconductor refrigerator 503 is used for compensation, the semiconductor refrigerator 503 is used for controlling the temperature of the optical module 100 and the circuit board 502 at the same time, so that the drift of the divergence angle at high and low temperatures is reduced. The optical module 100 is bonded to the base 100a to form a small module that is bonded to the circuit board 502.
In summary, with the above-described compensation structure, local material compensation is adopted for the optical component having a large influence on the divergence angle for at least two optical elements 300 and the optical module 100 as a whole. The two optical elements 300, the laser light source 10, the optical module 100 and the laser light source 10 form small modules respectively, so that the problem that the divergence angle is out of tolerance at high and low temperatures is solved, and the base 500 and the base 100a are prevented from being deformed greatly at high and low temperatures, so that the directivity of the optical module 100 is changed greatly, and the performance of the optical module 100 is affected.
The optical device can be applied to a laser radar system, and the embodiment of the application provides the laser radar system. The laser spot system can be applied to an automobile LiDAR laser spot system which takes LD as a light source.
The optical device and the lidar system have the same structure and advantages as the optical module 100 in the previous embodiment. The structure and the advantages of the optical module 100 are described in detail in the foregoing embodiments, and are not repeated here.
The foregoing is merely an alternative embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in detail.
Claims (8)
1. An optical device is characterized by comprising a base, a laser light source connected with the base and an optical module arranged on the base, wherein the optical module comprises at least two optical elements, and the laser light source emits light beams towards the optical module to form light spots;
the optical device further comprises a compensation structure, at least two optical elements are fixed on the base along a first direction through the compensation structure so as to compensate the relative distance between the at least two optical elements along the optical axis direction, and the first direction is a direction insensitive to the divergence angle and the directivity index of the light spots.
2. The optical device according to claim 1, wherein the compensation structure is a support member provided corresponding to at least two of the optical elements, and a material of the support member is an iron-nickel alloy or a ceramic.
3. The optical device of claim 1, wherein the compensation structure is a support member disposed in correspondence with at least two of the optical elements, the support member being formed by stamping a ceramic matrix composite sheet metal.
4. The optical device of claim 1, wherein the compensation structure is a semiconductor refrigerator, the laser light source is disposed on a circuit board, the optical module is connected to the circuit board through the base, and the circuit board is connected to the semiconductor refrigerator.
5. The optical device of claim 4, wherein the optical module is disposed on an outgoing side of the laser light source, the base and the laser light source are both located on one side of the circuit board, and the semiconductor refrigerator is located on the other side of the circuit board.
6. The optical device of claim 4, wherein the laser light sources are each located on one side of the circuit board, the base and the semiconductor refrigerator are located on the other side of the circuit board, and a gap is provided between the base and the semiconductor refrigerator.
7. The optical device of claim 1, wherein the laser light source is a multichannel edge-emitting laser.
8. A lidar system comprising an optical device according to any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223022014.2U CN219143083U (en) | 2022-11-14 | 2022-11-14 | Optical device and laser radar system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223022014.2U CN219143083U (en) | 2022-11-14 | 2022-11-14 | Optical device and laser radar system |
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| CN219143083U true CN219143083U (en) | 2023-06-06 |
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| CN202223022014.2U Active CN219143083U (en) | 2022-11-14 | 2022-11-14 | Optical device and laser radar system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024103823A1 (en) * | 2022-11-14 | 2024-05-23 | 西安炬光科技股份有限公司 | Optical device and laser radar system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024103823A1 (en) * | 2022-11-14 | 2024-05-23 | 西安炬光科技股份有限公司 | Optical device and laser radar system |
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