Light amplification module, laser radar and mobile device

Abstract

The embodiment of the invention discloses a light amplification module, a laser radar and a mobile device. The light amplification module comprises a heat dissipation module, a plurality of first substrates, a plurality of light amplifiers and a plurality of first lenses. The heat dissipation module is provided with a first heat dissipation surface. The first substrates are installed on the first heat dissipation surface and are arranged at intervals. The optical amplifiers are semiconductor optical amplifiers, and the optical amplifiers are installed on the corresponding first substrates in a one-to-one correspondence mode and extend in the first direction. The optical amplifiers are arranged at intervals in the second direction. The first lenses are in one-to-one correspondence with the optical amplifiers, the first lenses are arranged on the upstream of the optical paths of the corresponding optical amplifiers, the optical axes of the first lenses extend in the third direction, and a first included angle is formed between the third direction and the first direction. The heat dissipation module is used for dissipating heat of the optical amplifier through the first heat dissipation surface. According to the optical amplification module, the current situation that the normal work of the optical amplifier is influenced due to high heat productivity caused by adoption of multiple optical amplifiers in the prior art can be improved.

Description

Technical Field

[0001] The present application relates to the field of laser detection technology, and in particular to an optical amplification module, a laser radar and a movable device. Background Art

[0002] LiDAR is a radar system that emits laser beams to detect target characteristics such as position and speed. Its working principle is to first emit detection light to the target, and then compare the received echo light reflected from the target with the local oscillator light. After appropriate processing, relevant information about the target can be obtained, such as target distance, direction, altitude, speed, attitude, and even shape parameters.

[0003] Generally, a laser radar includes a housing, a light source module, an optical amplifier module, a scanning module, and a photoelectric detection module. Among them, the light source module is used to generate detection light. The optical amplifier module is used to amplify the above-mentioned detection light to increase the optical power of the detection light, thereby improving the detection performance of the laser radar. The scanning component of the scanning module can rotate relative to the housing, and then can form a scan of the detection light / echo light by reflecting the detection light / echo light; wherein the echo light is formed by the target object reflecting the detection light. The photoelectric detection module is used to receive the echo light transmitted by the scanning module. Summary of the invention

[0004] The laser radar in the related art detects through multiple beams of detection light to improve the detection field of view under the same detection resolution, or to improve the resolution under the same detection field of view. Correspondingly, the optical amplifier module also includes multiple optical amplifiers, each of which is used to amplify a beam of detection light. However, the setting of multiple optical amplifiers makes the overall heat generation of the optical amplifier module higher. If the heat cannot be dissipated in time, it may affect the gain effect of the optical amplifier.

[0005] The embodiments of the present application provide an optical amplifier module, a laser radar and a movable device to improve the current situation in the related art where multiple optical amplifiers are used, resulting in high heat generation, thereby affecting the normal operation of the optical amplifiers.

[0006] In a first aspect, an embodiment of the present application provides an optical amplification module, which includes a heat dissipation module, a plurality of first substrates, a plurality of optical amplifiers, and a plurality of first lenses. The heat dissipation module has a first heat dissipation surface. The first substrate is mounted on the first heat dissipation surface, and each of the first substrates is arranged at intervals. The optical amplifier is a semiconductor optical amplifier, each of the optical amplifiers corresponds to each of the first substrates one by one, the optical amplifier is mounted on the corresponding first substrate, the optical amplifier extends along a first direction, and each of the optical amplifiers is arranged at intervals along a second direction, and the second direction is perpendicular to the first direction. Each of the first lenses corresponds to each of the optical amplifiers one by one, the first lens is arranged upstream of the optical path of the corresponding optical amplifier, the optical axis of the first lens extends along a third direction, and the third direction has a first angle with the first direction. Wherein, the heat dissipation module is used to dissipate heat to the optical amplifier through the first heat dissipation surface.

[0007] In some embodiments, the first substrate has a first side surface and a second side surface perpendicular to the first direction, and a third side surface and a fourth side surface parallel to the third direction, the first side surface and the second side surface are arranged opposite to each other along the first direction, and the third side surface and the fourth side surface are arranged opposite to each other along a direction perpendicular to the third direction.

[0008] In some embodiments, the first substrates are arranged in a linear array along the second direction, and the first side surfaces of the first substrates are coplanar.

[0009] In some embodiments, a plurality of second lenses are further included. Each second lens corresponds to each optical amplifier one by one, and the second lens is arranged downstream of the optical path of the corresponding optical amplifier, and the optical axis of the second lens has a second angle with the first direction. The optical axis of the second lens is parallel to the optical axis of the first lens.

[0010] In some embodiments, a second substrate is further included, the second substrate including a main body and an extension. The main body is arranged opposite to the first heat dissipation surface and is located on a side of each optical amplifier away from the first heat dissipation surface. One end of the extension is connected to the main body, and the other end is connected to the first heat dissipation surface.

[0011] In some embodiments, along a direction perpendicular to the first heat dissipation surface, a side of the first lens facing away from the first heat dissipation surface is located on a side of the optical amplifier facing away from the first heat dissipation surface. The main body includes a base and a protrusion, the base is arranged opposite to the first heat dissipation surface and connected to the extension, the protrusion is arranged on a side of the base facing the optical amplifier and protrudes relative to the base, and the protrusion is connected to the optical amplifier.

[0012] In some embodiments, the optical amplifier is soldered to the first substrate, and the optical amplifier is soldered to the second substrate. The melting temperature of the soldering material between the optical amplifier and the second substrate is lower than the melting temperature of the soldering material between the optical amplifier and the first substrate.

[0013] In some embodiments, the heat dissipation module is a semiconductor cooler.

[0014] In some embodiments, the optical amplifier comprises a first electrode and a second electrode with opposite polarities. The first substrate is provided with a first conductive layer on a side facing the optical amplifier, and the first electrode is electrically connected to the first conductive layer.

[0015] The optical amplifier module further includes a first conductive module and a second conductive module. The first conductive module is disposed on the first heat dissipation surface and electrically connected to the first conductive layer of each first substrate. The second conductive module is disposed on the first heat dissipation surface and electrically connected to the second electrode of each optical amplifier.

[0016] In some embodiments, the first conductive module includes a plurality of first conductive elements, each of which is connected to the first conductive layer of each first substrate in a one-to-one correspondence. The second conductive module includes a plurality of second conductive elements, each of which is connected to the second electrode of each optical amplifier in a one-to-one correspondence. Along the second direction, the first conductive module and the second conductive module are disposed on both sides of each optical amplifier.

[0017] In a second aspect, an embodiment of the present application provides a laser radar, which includes a light source module and the above-mentioned optical amplifier module. The light source module is used to generate multiple beams of detection light. Each of the optical amplifiers in the optical amplifier module is used to receive a beam of the detection light and amplify it.

[0018] In a third aspect, an embodiment of the present application provides a movable device, comprising a movable body and the above-mentioned laser radar, wherein the laser radar is mounted on the body.

[0019] The optical amplification module provided in the embodiment of the present application includes a heat dissipation module, a plurality of first substrates, a plurality of optical amplifiers, and a plurality of first lenses. The heat dissipation module has a first heat dissipation surface. Each first substrate is arranged on the first heat dissipation surface and is arranged at intervals; each optical amplifier corresponds to each first substrate one by one, and each optical amplifier is fixed to the first heat dissipation surface through the corresponding first substrate, so that the heat dissipation module can dissipate heat to each optical amplifier through the first heat dissipation surface. Therefore, the optical amplification module can improve the current related technology that uses multiple optical amplifiers, resulting in high heat generation, thereby affecting the normal operation of the optical amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a top view of an optical amplification module provided in one embodiment of the present application;

[0022] Figure 2 yes Figure 1 A cross-sectional view of the optical amplifier module along line AA;

[0023] Figure 3 It is a schematic diagram of the optical path of the light beam transmitted through the optical amplifier;

[0024] Figure 4 is a top view of an optical amplification module provided in some other embodiments of the present application;

[0025] Figure 5 is a cross-sectional schematic diagram of an optical amplification module provided in some embodiments of the present application;

[0026] Figure 6 is a schematic diagram of a laser radar provided in some embodiments of the present application;

[0027] Figure 7 It is a schematic diagram of a removable device provided in one embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1. Optical amplifier module

[0030] 100, heat dissipation module; 101, first heat dissipation surface;

[0031] 200, first substrate; 201, first side surface; 202, second side surface; 203, third side surface; 204, fourth side surface; 205, first conductive layer; 206, first conductive module; 207, second conductive module; 2061, first conductive element; 2071, second conductive element

[0032] 300, optical amplifier; 301, waveguide;

[0033] 400, first lens;

[0034] 500, second lens;

[0035] 600, second substrate; 610, main body; 620, extension part;

[0036] 2. Laser radar; 21. Light source module; 22. Scanning module; 23. Photoelectric detection module;

[0037] 3. Mobile device; 31. Main body;

[0038] X, first direction; Y, second direction; U, third direction. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0040] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0041] The laser radar in the related art detects through multiple beams of detection light to improve the detection field of view under the same detection resolution, or to improve the resolution under the same detection field of view. Correspondingly, the optical amplifier module also includes multiple optical amplifiers, each of which is used to amplify a beam of detection light. However, the setting of multiple optical amplifiers makes the overall heat generation of the optical amplifier module higher. If the heat cannot be dissipated in time, the heat will accumulate rapidly at the optical amplifier module and may affect the gain effect of the optical amplifier, thereby affecting the detection performance of the laser radar.

[0042] The embodiments of the present application aim to provide an optical amplifier module, a laser radar and a movable device to improve the current situation in which the use of multiple optical amplifiers in the related technology causes high heat generation, thereby affecting the normal operation of the optical amplifiers.

[0043] See also Figure 1 and Figure 2, which respectively show a top view of the optical amplification module 1 in some embodiments of the present application, and a cross-sectional view along the AA line in the figure, the optical amplification module 1 includes a heat dissipation module 100, a plurality of first substrates 200, a plurality of optical amplifiers 300 and a plurality of first lenses 400. The heat dissipation module 100 is a mounting base for the other structures mentioned above, and has a first heat dissipation surface 101; the heat dissipation module 100 is used to dissipate heat for each optical amplifier 300 through the first heat dissipation surface 101. The first substrate 200 is mounted on the first heat dissipation surface 101, and each first substrate 200 is arranged at intervals. The optical amplifier 300 corresponds to the first substrate 200 one by one, and each optical amplifier 300 is correspondingly mounted on a first substrate 200, and the optical amplifier 300 is used to gain amplify the light beam. The optical amplifier 300 extends along the first direction X shown in the figure, and each optical amplifier 300 is arranged at intervals along the second direction Y perpendicular to the first direction X. Each first lens 400 corresponds to each optical amplifier 300, and each first lens 400 is disposed upstream of the optical path of the corresponding optical amplifier 300, and is used to focus the light beam signal so that the focused light beam enters the optical amplifier 300 for amplification. The optical axis of the first lens 400 extends along the third direction U shown in the figure, and the third direction U has a first angle α with the first direction X. It should be noted that the "multiple" mentioned in this application means more than two.

[0044] For the above heat dissipation module 100, please refer to Figure 1 and Figure 2 The heat dissipation module 100 is a component used for heat dissipation in the optical amplification module 1, and has a first heat dissipation surface 101. The first heat dissipation surface 101 is a surface for directly or indirectly mounting the first substrate 200, the optical amplifier 300 and the first lens 400, and is also the heat dissipation surface of the heat dissipation module 100. Therefore, the heat dissipation module 100 can dissipate the heat generated by the optical amplifier 300 at a higher rate through the first heat dissipation surface 101, thereby avoiding a large amount of heat accumulation in the optical amplification module 1. Optionally, the first heat dissipation surface 101 is a metal surface, so that a faster heat dissipation effect can be achieved. In this embodiment, the heat dissipation module 100 is a semiconductor refrigerator (Thermoelectric cooler, TEC). Of course, in other embodiments of the present application, the heat dissipation module can also be any component that can dissipate heat; for example, in other embodiments, the heat dissipation module can also be a cooling element with a phase change medium, or an air-cooled element.

[0045] Regarding the first substrate 200, please continue to refer to Figure 1 and Figure 2The first substrate 200 is used to carry and install the components of the optical amplifier 300. The first substrate 200 is a plate-shaped structure as a whole, and is installed on the first heat dissipation surface 101. The multiple first substrates 200 are arranged at intervals along the second direction Y, that is, there is a gap between any two adjacent first substrates 200. In this embodiment, the first substrate 200 includes an aluminum nitride substrate; since aluminum nitride has better insulation performance and thermal conductivity, the first substrate 200 can be insulated from the first heat dissipation surface 101, and the optical amplification module 1 can have a better heat dissipation effect.

[0046] For the above optical amplifier 300, please continue to refer to Figure 1 and Figure 2 , the optical amplifier 300 is used to receive the light beam and perform gain amplification. In this embodiment, the optical amplifier 300 is a semiconductor optical amplifier (SOA). SOA has the advantages of small size, low power consumption and chip-based, so it is easy to simplify the structure of the optical amplifier module 1 and is conducive to reducing the volume of the optical amplifier module 1. The optical amplifier 300 is a flat strip structure as a whole, and the whole extends along the first direction X shown in the figure. Each optical amplifier 300 is correspondingly installed on a first substrate 200, and the first optical amplifiers 300 are arranged along the second direction Y mentioned above. In this embodiment, the optical amplifier 300 is welded and fixed to the first substrate 200; for example, the optical amplifier 300 can be fixed to the first substrate 200 by gold-tin eutectic welding. It should be noted that in this embodiment, the first direction X is a direction parallel to the first heat dissipation surface 101, and the second direction Y is a direction parallel to the first heat dissipation surface 101 and perpendicular to the first direction X.

[0047] Regarding the first lens 400, please continue to refer to Figure 1 , each first lens 400 corresponds to each optical amplifier 300 one by one, and the first lens 400 is located upstream of the optical path of the corresponding optical amplifier 300, that is, located on the side of the light receiving end of the optical amplifier 300. The first lens 400 is used to focus the light beam so that the focused light beam enters the light receiving end of the optical amplifier; the setting of the first lens 400 is intended to improve the coupling efficiency of the light beam coupled into the optical amplifier 300. In this embodiment, the extension direction of the optical axis of the first lens 400 is the third direction U, and the third direction U has a first angle α with the above-mentioned first direction X to reduce the reflection ratio of the light beam when entering the optical amplifier 300, that is, to improve the coupling efficiency of the light beam coupled into the optical amplifier 300. For details, please refer to Figure 3, which shows a schematic diagram of the optical path of the light beam transmitted in the optical amplifier 300. As shown in the figure, the optical amplifier 300 includes a waveguide 301, and the extension direction of the waveguide 301 has a second angle β with the first direction X. In this way, when the light beam enters the waveguide 301 from the lower end of the waveguide 301 shown in the figure, it has a first angle α of non-90 degrees with the end face of the waveguide 301, so it can be coupled into the waveguide 301 with a higher coupling efficiency. Further, in this embodiment, the refractive index of air is η1, the refractive index of the waveguide 301 is η2, and the first angle α and the second angle β are configured to satisfy: η1×sinα=η2×sinβ. Then, when the light beam emerges from the upper end of the waveguide 301 shown in the figure, it will still emerge parallel to the third direction U.

[0048] Furthermore, in order to facilitate the collimation of the light beam emitted by the optical amplifier 300, in this embodiment, the optical amplification module 1 further includes a plurality of second lenses 500. Figure 1 , each second lens 500 is arranged in one-to-one correspondence with each of the above-mentioned optical amplifiers 300, and each second lens 500 is arranged downstream of the optical path of the corresponding optical amplifier 300 to collimate the light beam emitted from the corresponding optical amplifier 300. In this embodiment, the optical axis of the second lens 500 is parallel to the optical axis of the first lens 400. As mentioned above, the light beam emitted by the optical amplifier 300 will still propagate along the third direction U, so the second lens 500 can be arranged parallel to the first lens 400 to facilitate the positioning and installation of the second lens 500. Of course, in other embodiments of the present application, if the first angle α and the second angle β do not satisfy the above relationship, the third angle γ of the optical axis of the second lens 500 relative to the extension direction of the optical amplifier 300 can be adaptively adjusted according to actual needs.

[0049] Next, the shape of the first substrate 200 and the optical amplifier 300 are supplementarily described.

[0050] Please continue reading Figure 1 , observed along the direction perpendicular to the first heat dissipation surface 101, the first substrate 200 is in a parallelogram shape as a whole. The first substrate 200 has a first side surface 201 and a second side surface 202 both perpendicular to the first direction X, and the first substrate 200 also has a third side surface 203 and a fourth side surface 204 both parallel to the third direction U; the first side surface 201 and the second side surface 202 are arranged opposite to each other along the first direction X, and the third side surface 203 and the fourth side surface 204 are arranged opposite to each other along the direction perpendicular to the third direction U, and the first side surface 201, the second side surface 202, the third side surface 203 and the fourth side surface 204 are all perpendicular to the first heat dissipation surface 101.

[0051] The design that the first side surface 201 and the second side surface 202 are perpendicular to the first direction X is conducive to positioning the optical amplifier 300 through the first side surface 201 and / or the second side surface 202. For example, the posture of the optical amplifier 300 during assembly can be controlled by controlling one end of the optical amplifier 300 to be flush with or parallel to the first side surface 201. The design that the third side surface 203 and the fourth side surface 204 are parallel to the third direction U is conducive to positioning the relative posture of the two by controlling the optical axis of the first lens 400 to be parallel to the third side surface 203. In other words, after determining the third direction U based on the relationship between the first angle α and the second angle β, the positional relationship between the first side surface 201, the second side surface 202, the third side surface 203 and the fourth side surface 204 of the first substrate 200 can be determined. When coupling the optical amplifier 300 with the first lens 400, by making the optical axis of the first lens 400 parallel to the third side surface 203, and the end of the waveguide 301 of the optical amplifier 300 close to the first lens 400 is located at the focus of the first lens 400, the detection light emitted through the first lens 400 can satisfy the relationship between the first angle α and the second angle β, and the light beam emitted by the optical amplifier 300 still propagates along the third direction U. In this way, when coupling the optical amplifier 300 with the second lens 500, by making the optical axis of the second lens 500 parallel to the third side surface 203, and the end of the waveguide 301 of the optical amplifier 300 close to the second lens 500 is located at the focus of the second lens 500. This method of assisting the optical coupling of the first lens 400 and the second lens 500 with reference to the third side surface 203 is relatively simple, and there is no need to measure the angles between the first lens 400 and the second lens 500 and the extension direction of the optical amplifier 300 for optical adjustment.

[0052] Preferably, in this embodiment, the first substrates 200 are arranged in a linear array along the second direction Y, and the first side surfaces 201 of the first substrates 200 are coplanar. In order to reduce the volume of the first substrate 200 as much as possible, the two ends of the optical amplifier 300 will be respectively located at the two corners of the first substrate 200 (the upper left corner and the lower right corner of the first substrate 200 as shown in Figure 1). Correspondingly, the first lens 400 will also be close to the corner position of the first substrate 200. At this time, if the first substrates 200 are arranged in a linear array along a direction perpendicular to the third direction U shown in the figure, the above-mentioned first lens 400 (for example, the first first lens from left to right) may cause interference to the adjacent first substrate 200 (for example, the second first substrate 200 from left to right). However, the way in which the first substrates 200 are arranged in a linear array along the second direction Y can make the first substrate 200 on the right side of the figure offset a certain distance above the figure, thereby avoiding the above-mentioned interference phenomenon.

[0053] The optical amplifier 300 includes a first electrode and a second electrode with opposite polarities, and voltages can be applied to the first electrode and the second electrode, so that the optical amplifier 300 works. In this embodiment, the first substrate 200 is provided with a first conductive layer 205 on a side facing the optical amplifier 300; for example, when the first substrate 200 includes an aluminum nitride substrate, the first conductive layer 205 is provided on a side of the aluminum nitride substrate facing the optical amplifier 300. The optical amplifier 300 is fixed to the first conductive layer 205, and the first electrode of the optical amplifier 300 is electrically connected to the first conductive layer 205. In addition, the optical amplification module 1 also includes a first conductive module 206 and a second conductive module 207. The first conductive module 206 is installed on the first heat dissipation surface 101 and is electrically connected to the first conductive layer 205 of each of the first substrates 200; the second conductive module 207 is installed on the first heat dissipation surface 101 and is electrically connected to the second electrode of each of the optical amplifiers 300.

[0054] Specifically, see Figure 4, which shows a schematic diagram of an optical amplifier module in some embodiments of the present application, the first conductive module 206 includes a plurality of first conductive elements 2061, each of which is electrically connected to a first conductive layer 205 of a first substrate 200. More specifically, the first conductive element 2061 includes a first insulating substrate provided on the first heat dissipation surface 101 and a second conductive layer provided on the first insulating substrate, and the second conductive layer is electrically connected to the corresponding first conductive layer 205 through a conductive element such as a flying wire. It can be understood that in other embodiments of the present application, the first conductive element 2061 may not be only partially conductive, such as not only the first and second conductive layers are conductive, but the entire structure may be conductive, and the present application does not limit this; in addition, the first conductive module 206 may not include a plurality of discrete first conductive elements 2061, but an integrated structure, which can also realize power supply to the first electrodes of multiple optical amplifiers 300. Similarly, the second conductive module 207 includes a plurality of second conductive elements 2071, each of which is electrically connected to a second electrode of an optical amplifier 300. More specifically, the second conductive element 2071 includes a second insulating substrate disposed on the first heat dissipation surface 101 and a third conductive layer disposed on the second insulating substrate, and the third conductive layer is electrically connected to the second electrode of the corresponding optical amplifier 300 through a conductive element such as a flying wire. It can be understood that in other embodiments of the present application, the second conductive element 2071 may not only be partially conductive, such as not only the third conductive layer is conductive, but also the entire structure may be conductive, and the present application does not limit this; in addition, the second conductive module 207 may not include a plurality of discrete second conductive elements 2071, but may be in the form of an integrated structure, which can also realize power supply to the second electrodes of multiple optical amplifiers 300. Optionally, along the second direction Y, the first conductive module 206 and the second conductive module 207 are disposed on both sides of each optical amplifier 300 to simplify the circuit layout of the optical amplifier module 1.

[0055] Furthermore, in order to enhance the heat dissipation effect of the optical amplifier 300, in some embodiments, the optical amplification module 1 may further include a second substrate 600. For details, please refer to Figure 5 , which shows a cross-sectional view of the optical amplification module 1 in some embodiments of the present application (the cutting direction can still refer to Figure 1), the second substrate 600 is a three-stage continuous bending structure as a whole, which includes a main body 610 and an extension 620. The main body 610 is a flat plate-like structure, which is arranged opposite to the first heat dissipation surface 101 and is located on the side of each optical amplifier 300 away from the first heat dissipation surface 101. The extension 620 is arranged between the main body 610 and the first heat dissipation surface 101, one end of which is connected to the main body 610 and the other end is connected to the first heat dissipation surface 101; along the second direction Y, the two extensions 620 are arranged opposite to each other in a direction perpendicular to the first direction X, thereby forming the three-stage continuous bending structure. The side of each optical amplifier 300 facing the first heat dissipation surface 101 is welded to the first substrate 200, and the side of each optical amplifier 300 away from the first heat dissipation surface 101 is welded to the second substrate 600. The first substrate 200 and the second substrate 600 both have good thermal conductivity, so that the heat generated by the optical amplifier 300 can be simultaneously guided to the heat dissipation module 100 via the first substrate 200 and the second substrate 600, thereby improving the heat dissipation efficiency of the heat dissipation module 100 for the optical amplifier 300. In this embodiment, similar to the first substrate 200, the second substrate 600 also includes an aluminum nitride substrate.

[0056] It should be noted that, since the optical amplifier 300 is first welded to the first substrate 200 and fixed to the first heat dissipation surface 101 of the heat dissipation module 100 together with the first substrate 200; in order to prevent the welding process of the optical amplifier 300 and the second substrate 600 from affecting the original welding effect of the optical amplifier 300 and the first substrate 200, the melting temperature of the welding material of the optical amplifier 300 and the second substrate 600 is lower than the welding temperature of the welding material of the optical amplifier 300 and the first substrate 200. In this embodiment, the optical amplifier 300 and the second substrate 600 are welded and fixed by a method that can be completed at a relatively low temperature such as nano silver paste sintering, so that it is not easy to affect the previous welding effect of the optical amplifier 300 and the first substrate 200. In addition, the extension portion 620 is provided with a through hole for the first conductive module 206 or the second conductive module 207 to pass through, so that it is convenient for the external circuit to apply voltage to the optical amplifier module 1.

[0057] As for the shape of the second substrate 600, it is actually diverse. In this embodiment, the main body 610 of the second substrate 600 extends along the second direction Y as a whole. Specifically, when observed in a direction perpendicular to the first heat dissipation surface 101, the main body 610 is in a parallelogram shape as a whole, with its long side extending along the second direction Y and its wide side extending along the first direction X; along the second direction Y, the two ends of the main body 610 are located outside each optical amplifier 300. The two extensions 620 are arranged one by one at the two ends of the main body 610 along the first direction Y. It should be understood that even if the second substrate is arranged as above in this embodiment, the present application is not limited thereto. In other embodiments of the present application, the second substrate may also be in other shapes. For example, in some other embodiments, when observed in a direction perpendicular to the first heat dissipation surface 101, the main body 610 may also be in a rectangular shape as a whole, with its long side extending in a direction perpendicular to the first direction X and its wide side extending along the first direction X. At this point, it should be noted that, in some embodiments, along the direction perpendicular to the first heat dissipation surface 101, the side of the first lens 400 that faces away from the first heat dissipation surface 101 is located on the side of the optical amplifier 300 that faces away from the first heat dissipation surface 101, and in this case, the main body 610 can be configured to include a base and a protrusion. Specifically, the base is arranged opposite to the first heat dissipation surface 101 and is located on the side of each optical amplifier 300 that faces away from the first heat dissipation surface 101, and the extension is connected to the base and to the extension; the protrusion is arranged on the side of the base facing the optical amplifier, is protruding relative to the base, and is connected to each optical amplifier 300.

[0058] In summary, the optical amplification module 1 provided in the embodiment of the present application includes a heat dissipation module 100, a plurality of first substrates 200, a plurality of optical amplifiers 300, and a plurality of first lenses 400. The heat dissipation module 100 has a first heat dissipation surface 101. Each first substrate 200 is disposed on the first heat dissipation surface 101 and is arranged at intervals; each optical amplifier 300 corresponds to each first substrate 200 one by one, and each optical amplifier 300 is fixed to the first heat dissipation surface 101 through the corresponding first substrate 200, so that the heat dissipation module 100 can dissipate heat for each optical amplifier 300 through the first heat dissipation surface 101. Therefore, the optical amplification module 1 can improve the current related technology that uses multiple optical amplifiers, which results in high heat generation and thus affects the normal operation of the optical amplifier.

[0059] It is worth mentioning that in other implementations of the present application, only one first substrate 200 may be provided, and each optical amplifier 300 may be provided on the first substrate 200. However, since each optical amplifier 300 is generally welded to the first substrate 200 in sequence, the welding process of the optical amplifier 300 welded later may cause the welding area of ​​the optical amplifier 300 welded earlier to remelt. In contrast, the embodiment of the present application provides multiple first substrates 200 corresponding to the optical amplifiers 300 one by one, so that the welding process of each optical amplifier 300 will not cause the welding area of ​​other optical amplifiers 300 to remelt, that is, the embodiment of the present application can overcome the above-mentioned shortcomings.

[0060] Based on the same inventive concept, the present application also provides a laser radar 2, see Figure 6 , which shows a schematic diagram of the laser radar 2, which includes a light source module 21, the above-mentioned optical amplifier module 1, a scanning module 22 and a photoelectric detection module 23. Among them, the light source module 21 is used to generate multiple beams of detection light and local oscillator light. For example, in some embodiments, the light source module 21 includes a laser and a spectrometer, the laser is used to generate a source light signal, and the spectrometer is used to receive the above-mentioned source light signal, and split the beam to obtain multiple beams of detection light for detecting the target object, and the local oscillator light used as a coherent reference. The optical amplifier module 1 is used to receive each detection light and amplify it to output the amplified detection light. The scanning module 22 is used to reflect the detection light, and the scanning module 22 includes one or more rotatable scanning elements to scan the detection light so that the detection light forms a specific detection field of view outside the laser radar 2. The scanning module 22 may include a multi-faceted rotating mirror and / or a galvanometer. The photoelectric detection module 23 is used to receive the local oscillator light and the echo light to obtain a beat frequency signal. The photoelectric detection module 23 may include a photoelectric detector, or include an optical mixer and a balanced photoelectric detector. Of course, the specific architecture of the laser radar 2 can be adaptively adjusted according to actual conditions; for example, the laser radar 2 can also include an optical chip module for realizing the integrated transmission and reception of detection light and echo light, and the above-mentioned photoelectric detection module 23 can also be integrated into the optical chip module to improve the overall integration of the laser radar 2.

[0061] It should be understood that even though this embodiment is described using the light source module 21 generating detection light and local oscillation light as an example, the present application is not limited to this; in other implementations of the present application, the light source module 21 may also only generate detection light, for example, the laser radar is a time of flight (TOF) laser radar.

[0062] Since the optical amplifier module 1 in the above-mentioned embodiment is included, the laser radar 2 provided in the application embodiment can improve the current situation in which the laser radar in the relevant technology uses multiple optical amplifiers, which causes high heat generation and thus affects the normal operation of the optical amplifier.

[0063] See also Figure 7 Based on the same inventive concept, the present application also provides a movable device 3, which includes a movable body 31 and the above-mentioned laser radar 2, and the laser radar 2 is mounted on the body 31. In this embodiment, the movable device 3 is a car; wherein the body 31 is the body of the car, and the laser radar is mounted on the body. Of course, in other embodiments of the present application, the movable device can also be any mobile tool equipped with the above-mentioned laser radar 2, such as an electric car, a drone, a robot, etc.

[0064] Since the laser radar 2 in the above-mentioned embodiment is included, the movable device 3 provided in the application embodiment can improve the current situation in which the laser radar of the movable device in the relevant technology uses multiple optical amplifiers, which causes high heat generation and thus affects the normal operation of the optical amplifier.

[0065] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to at least two, for example, two, three, four, etc. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0066] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An optical amplifier module, characterized in that: include: A heat dissipation module having a first heat dissipation surface; A plurality of first substrates, wherein the first substrates are mounted on the first heat dissipation surface and the first substrates are spaced apart from each other; A plurality of optical amplifiers, wherein the optical amplifiers are semiconductor optical amplifiers, each of the optical amplifiers corresponds to each of the first substrates one by one, the optical amplifiers are mounted on the corresponding first substrates, the optical amplifiers extend along a first direction, and each of the optical amplifiers is arranged at intervals along a second direction, and the second direction is perpendicular to the first direction; as well as a plurality of first lenses, each of the first lenses corresponding to each of the optical amplifiers one by one, the first lenses being arranged upstream of the optical path of the corresponding optical amplifier, the optical axis of the first lens extending along a third direction, and a first angle being formed between the third direction and the first direction; The heat dissipation module is used to dissipate heat from the optical amplifier through the first heat dissipation surface.

2. The optical amplifier module according to claim 1, characterized in that: The first substrate has a first side surface and a second side surface perpendicular to the first direction, and a third side surface and a fourth side surface parallel to the third direction. The first side surface and the second side surface are arranged opposite to each other along the first direction, and the third side surface and the fourth side surface are arranged opposite to each other along a direction perpendicular to the third direction.

3. The optical amplification module according to claim 2, characterized in that: The first substrates are arranged in a linear array along the second direction, and the first side surfaces of the first substrates are coplanar.

4. The optical amplification module according to claim 1, characterized in that: Also comprising a plurality of second lenses; Each of the second lenses corresponds to each of the optical amplifiers one by one, the second lenses are arranged downstream of the optical path of the corresponding optical amplifier, and the optical axis of the second lens has a second angle with the first direction; The optical axis of the second lens is parallel to the optical axis of the first lens.

5. The optical amplifier module according to claim 1, characterized in that: Also included is a second substrate, the second substrate comprising: a main body, arranged opposite to the first heat dissipation surface and located on a side of each of the optical amplifiers away from the first heat dissipation surface; and The extension portion has one end connected to the main body portion and the other end connected to the first heat dissipation surface.

6. The optical amplification module according to claim 5, characterized in that: Along a direction perpendicular to the first heat dissipation surface, a surface of the first lens facing away from the first heat dissipation surface is located on a side of the optical amplifier facing away from the first heat dissipation surface; The main body includes a base and a protrusion. The base is arranged opposite to the first heat dissipation surface and connected to the extension. The protrusion is arranged on a side of the base facing the optical amplifier and protrudes relative to the base. The protrusion is connected to the optical amplifier.

7. The optical amplification module according to any one of claims 5 to 6, characterized in that: The optical amplifier is welded to the first substrate, and the optical amplifier is welded to the second substrate; The melting temperature of the soldering material between the optical amplifier and the second substrate is lower than the melting temperature of the soldering material between the optical amplifier and the first substrate.

8. The optical amplification module according to any one of claims 1 to 6, characterized in that: The heat dissipation module is a semiconductor refrigerator.

9. The optical amplifier module according to claim 1, characterized in that: The optical amplifier comprises a first electrode and a second electrode with opposite polarities; The first substrate is provided with a first conductive layer on a side facing the optical amplifier, and the first electrode is electrically connected to the first conductive layer; The optical amplification module also includes: A first conductive module, disposed on the first heat dissipation surface and electrically connected to the first conductive layer of each of the first substrates; and The second conductive module is disposed on the first heat dissipation surface and is electrically connected to the second electrodes of each of the optical amplifiers.

10. The optical amplifier module according to claim 9, characterized in that: The first conductive module includes a plurality of first conductive elements, each of which is connected to the first conductive layer of each of the first substrates in a one-to-one correspondence; The second conductive module includes a plurality of second conductive elements, and each of the second conductive modules is connected to the second electrode of each of the optical amplifiers in a one-to-one correspondence; Along the second direction, the first conductive module and the second conductive module are respectively arranged on two sides of each of the optical amplifiers.

11. A laser radar, characterized in that: include: A light source module, used for generating multiple beams of detection light; as well as According to the optical amplification module as described in any one of claims 1 to 10, each of the optical amplifiers is used to receive a beam of the detection light and amplify it.

12. A movable device, characterized in that: It comprises a movable main body and a laser radar as described in claim 11, wherein the laser radar is mounted on the main body.

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