CN117055234A - Optical shaping module, device and laser radar system - Google Patents

Optical shaping module, device and laser radar system Download PDF

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Publication number
CN117055234A
CN117055234A CN202210492846.6A CN202210492846A CN117055234A CN 117055234 A CN117055234 A CN 117055234A CN 202210492846 A CN202210492846 A CN 202210492846A CN 117055234 A CN117055234 A CN 117055234A
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China
Prior art keywords
homogenizing
prism
energy
optical shaping
homogenizer
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CN202210492846.6A
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Chinese (zh)
Inventor
种洪涛
刘兴胜
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Focuslight Technologies Inc
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Focuslight Technologies Inc
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Priority to CN202210492846.6A priority Critical patent/CN117055234A/en
Publication of CN117055234A publication Critical patent/CN117055234A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/93—Lidar systems specially adapted for specific applications for anti-collision purposes
    • G01S17/931—Lidar systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0972—Prisms

Abstract

The application provides an optical shaping module, an optical shaping device and a laser radar system, which relate to the technical field of optics and comprise a homogenizer and a prism which are arranged along the optical axis of a laser light source; the incident light enters the homogenizer to be emitted at different divergence angles, and the incident light is partially overlapped in an angular space, so that the energy distribution of the light beam of the incident light in the angular space range is realized; the prism is used for dividing and rearranging medium-intensity energy after passing through the homogenizer, emitting light spots with the energy distribution in the slow axis direction, namely the energy distribution in the middle, the two ends and the weak area between the middle and the two ends, so that vignetting defects generated by the light spots with the energy being in the medium-intensity uniform distribution in the prior art are overcome, the medium-intensity energy can be fully utilized, the loss caused by the energy of the medium-intensity distribution striking the ground is avoided or reduced, and the detection performance of the L i DAR of the automobile is improved.

Description

Optical shaping module, device and laser radar system
Technical Field
The application relates to the technical field of optics, in particular to an optical shaping module, an optical shaping device and a laser radar system.
Background
When the laser diode is used as the automobile laser radar transmitting module of the light source, the angular space energy distribution curve of the emergent light beam in the slow axis direction is uniformly distributed in medium intensity, as shown in figure 1, the energy distribution can not effectively overcome the vignetting defect of the lens of the laser radar receiving module, the purpose of the medium intensity uniform distribution is to obtain a farther detection distance for the middle angle, but half of the energy of the medium strong light beam in the distribution is lost to the ground, so that the energy is wasted.
Disclosure of Invention
The application aims to provide an optical shaping module, an optical shaping device and a laser radar system, which can realize light spots with strong energy distribution in the middle, secondary strong at two ends and weak areas between the middle and the two ends, effectively utilize the energy of a medium strong light beam and improve the energy utilization rate.
Embodiments of the present application are implemented as follows:
in one aspect of the present application, an optical shaping module is provided, including a homogenizer and a prism disposed along an optical axis of a laser light source; the incident light enters the homogenizer to be emitted at different divergence angles, and the incident light is partially overlapped in an angular space, so that the energy distribution of the light beam of the incident light in the angular space range is realized; the prism performs segmentation rearrangement on the medium-intensity energy after passing through the homogenizer, and emits light spots with strong energy distribution in the middle, second-intensity at two ends and weak areas between the middle and the two ends in the slow axis direction.
The homogenizer distributes angular space energy of the light beam, the prism divides and rearranges the energy of the middle-intensity part, light spots with energy distribution in the slow axis direction in a mountain shape are formed, and vignetting defects generated by the light spots with energy distribution in the middle-intensity uniform distribution in the prior art are overcome.
In one possible implementation, the homogenizer includes a first homogenizing mirror and a second homogenizing mirror located at two sides of the first homogenizing mirror along the slow axis direction, the first homogenizing mirror and the second homogenizing mirror have different surface types, and the prism is correspondingly disposed at the light emitting side of the first homogenizing mirror.
The light beam entering the first homogenizing lens exits at a first preset divergence angle, the light beam entering the second homogenizing lens exits at a second preset divergence angle, and then the light beam exiting at the first preset divergence angle and the light beam exiting at the second preset divergence angle are partially overlapped on the receiving surface, and strong line light spots are formed in the receiving surface to finish the redistribution of energy in the diagonal space range.
In one possible implementation, the fast axis of the incident light is a collimated beam and the numerical aperture of the slow axis beam is less than or equal to the numerical aperture of the first homography.
In one possible implementation, the homogenizer includes a homogenizing mirror, a first homogenizing region and second homogenizing regions located at two sides of the first homogenizing region along the slow axis direction are divided on the homogenizing mirror, the surface types of the first homogenizing region and the second homogenizing region are different, and the prism is correspondingly arranged at the light emergent side of the first homogenizing region.
The homogenizer may be a single independent element that is divided into different regions to accomplish the redistribution of energy in the diagonal spatial range.
In one possible implementation, the fast axis of the incident light of the homogenization environment is a collimated beam and the numerical aperture of the slow axis beam is less than or equal to the numerical aperture of the first homogenization zone.
In one possible implementation, the light incident surface of the prism includes a first prism surface and a second prism surface located on at least one of two sides of the first prism surface along the slow axis direction, an included angle β is formed between the first prism surface and the slow axis direction, and an included angle α is formed between the second prism surface and the slow axis direction.
The prism is a polyhedron and is used for dividing and rearranging the energy of the medium-intensity part emitted by the homogenizer.
In one possible implementation, the energy profile of the middle position of the light spot is determined by the angle β.
The included angle beta of the prism is related to the middle strength direction, the included angle beta is reduced, and the middle strength direction moves towards the middle of the mountain shape; the included angle beta becomes larger, and the middle strength direction moves to two sides.
In one possible implementation, the energy profile of the two-sided position of the light spot is determined by the angle α.
The included angle alpha of the prism can change the peak directions at the two sides of the mountain shape, the included angle alpha is reduced, and the peak directions move towards the middle; the included angle alpha becomes larger, and the "mountain" direction moves to both sides.
In a second aspect of the present application, an optical shaping device is provided, which includes a laser source and the optical shaping module.
In a third aspect of the present application, a lidar system is provided, comprising the optical shaping device described above.
The beneficial effects of the application include: according to the optical shaping module, the optical shaping device and the laser radar system provided by the embodiment of the application, the light beams emitted by the laser light source are emitted in different divergence angles as the incident light incident homogenizer, and are partially overlapped in the angular space, so that the energy distribution of the light beams of the incident light in the angular space range is realized; the prism performs segmentation rearrangement on medium-intensity energy after passing through the homogenizer, emits light spots with strong middle and second-intensity energy distribution at the two ends and weak areas between the middle and the two ends in the slow axis direction, the homogenizer distributes angular space energy of light beams, the prism performs segmentation rearrangement combination on the energy of the medium-intensity part to form light spots with mountain-shaped energy distribution in the slow axis direction, the mountain-shaped energy distribution light spots can make up for vignetting defects generated by the light spots with medium-intensity uniform distribution in the prior art, the medium-intensity energy can be fully utilized, the loss caused by the medium-intensity distribution energy striking on the ground is avoided or reduced, and the detection performance of the automobile LiDAR is improved.
The optical shaping device provided by the embodiment of the application comprises a laser light source and the optical shaping module. The laser radar system provided by the embodiment of the application comprises the optical shaping device. When the laser beam is applied to a laser emission system of the automobile LiDAR, vignetting defects are made up through the formed mountain-shaped energy distribution, medium-intensity energy can be fully utilized, and the detection distance of the automobile LiDAR is increased.
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 as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of the medium intensity uniform energy distribution after passing through a homogenizer;
FIG. 2 is a schematic diagram of an optical structure of an optical shaping module according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an optical path of an optical shaping module according to an embodiment of the present application;
FIG. 4 is a graph showing the energy distribution of a prism according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a prism according to an embodiment of the present application;
FIG. 6 is a graph showing an energy distribution diagram for changing included angles of a prism according to an embodiment of the present application;
FIG. 7 is a second schematic diagram of a prism according to an embodiment of the present application;
FIG. 8 is a second schematic diagram of an optical structure of an optical shaping module according to an embodiment of the present application;
fig. 9 is an energy distribution diagram after passing through the prism of fig. 7.
Icon: 101-a homogenizer; 101 a-a first homogenization zone; 101 b-a second homogenization zone; 102-a prism; 102 a-a first land; 102 b-a second land; alpha and beta-included angles.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying 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 of the present application. The components of the embodiments of the present application 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 application, as presented in the figures, 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 those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the 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 conventionally put in use of the inventive product, are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed 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 above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In order to obtain a farther detection distance from a middle angle, an angular space energy distribution curve of a light beam in a slow axis direction is uniformly distributed in a middle intensity mode shown in fig. 1, but the energy distribution cannot effectively overcome the vignetting defect of a lens of a LiDAR receiving module, and half of energy of the distributed middle strong light beam is lost to the ground. The reason is that the divergence angle of the outgoing beam in the vertical direction is generally 25 degrees or more, and the installation height of the LiDAR on the vehicle is about 1 m-2 m, when the light is emitted for 5 m-10 m, the light rays with large downward angles start to strike the ground, and as the distance increases, the light rays with smaller and smaller angles also start to strike the ground, and the light rays exceeding 50m and 13 degrees strike the ground, and the energy loss is half as much as 200 m.
In order to solve the above-mentioned problems, please refer to fig. 2, fig. 2 is a schematic diagram illustrating an embodiment of an optical shaping module according to an embodiment of the present application. The optical shaping module provided by the embodiment of the application comprises a homogenizer 101 and a prism 102 which are arranged along the optical axis of a laser light source, wherein the incident light enters the homogenizer 101 to be emitted at different divergence angles, and the incident light is partially overlapped in an angular space so as to realize energy distribution of the light beam of the incident light in the angular space range, and the energy distribution shown in figure 1, namely medium-intensity uniform energy distribution, can be formed; the prism 102 performs division rearrangement on the medium intensity energy after passing through the homogenizer 101, and emits a light spot with a medium intensity, a second intensity at both ends, and a weak region between the medium and both ends, as shown in fig. 3, in the slow axis direction energy distribution.
The light beam emitted by the laser light source sequentially passes through the homogenizer 101 and the prism 102, the homogenizer 101 distributes the energy of the light beam of the incident light in angular space, and the prism 102 rearranges the energy division in the middle and strong energy so as to emit the light beam into the mountain-shaped energy distribution with the energy distribution in the slow axis direction in the middle and strong, secondary and weak areas between the middle and the two ends.
As shown in fig. 3, in the "mountain" energy distribution curve, the energy intensity in the middle is highest, the energy intensity at two ends is second strongest, a concave region with weaker energy is formed between the middle and two ends, so as to form a second-strongest-weak-strong-weak-second-strongest "mountain" distribution, the direction with high left-side intensity is applied in the elevation direction, and the lower edge line of the middle-strong angle space is parallel to the horizontal direction at this time.
The optical shaping module provided by the embodiment of the application is characterized in that the light beam emitted by the laser light source is collimated by the fast axis, and is emitted as incident light to the homogenizer 101 at different divergence angles after the numerical aperture of the slow axis is smaller than or equal to the numerical aperture of the first homogenizing environment, and partial overlapping is formed in the angular space, so that the energy distribution of the light beam of the incident light in the angular space range is realized; the prism 102 performs segmentation rearrangement on medium-intensity energy after passing through the homogenizer 101, emits light spots with strong middle and secondary intensity at two ends and weak areas between the middle and the two ends in the slow axis direction energy distribution, the homogenizer 101 performs segmentation rearrangement combination on the energy of the medium-intensity part of the light beam, and forms light spots with mountain-shaped energy distribution in the slow axis direction energy distribution.
Specifically, the homogenizer 101 includes a first homogenizing mirror and a second homogenizing mirror located on both sides of the first homogenizing mirror along the slow axis direction, the first homogenizing mirror and the second homogenizing mirror have different surface types, and the prism 102 is correspondingly disposed on the light emitting side of the first homogenizing mirror.
The homogenizer 101 is a whole formed by combining the first homogenizing mirror and the second homogenizing mirror, the incident light enters the homogenizer 101, as shown in fig. 3, the light beam entering the first homogenizing mirror exits at a first preset divergence angle, the light beam entering the second homogenizing mirror exits at a second preset divergence angle, and further the light beam exiting at the first preset divergence angle and the light beam exiting at the second preset divergence angle form partial overlapping on the receiving surface, and strong linear light spots are formed in the receiving surface to finish the redistribution of energy in the diagonal space range.
Further, the length of each of the first and second homogenizing mirrors in the slow axis direction (the length direction in the slow axis direction corresponds to the vertical direction shown in fig. 2) may be set depending on the angular space energy distribution curve of the laser light source in the slow axis direction and the distance between the homogenizer 101 and the laser light source.
And the fast axis of the incident light is a collimated light beam and the numerical aperture of the slow axis light beam is less than or equal to the numerical aperture of the first homogenizing environment. Numerical aperture refers to the sine of half the divergence angle of the incident light.
It is also possible that the homogenizer 101 may be a single independent element, divided into different areas, to accomplish the redistribution of energy in the angular space, the principle and arrangement of which are similar to those of the aforementioned plurality of homogenizing mirrors, and the homogenizer 101 includes, for example, a homogenizing mirror on which a first homogenizing zone 101a and a second homogenizing zone 101b located on both sides of the first homogenizing zone 101a in the slow axis direction are divided, the first homogenizing zone 101a and the second homogenizing zone 101b having different surface shapes, and the prism 102 is correspondingly disposed on the light emitting side of the first homogenizing zone 101 a.
Consistent with the principle that the homogenizer 101 is formed by combining the first homogenizing mirror and the second homogenizing mirror, when the homogenizer 101 is a single homogenizer 101, the light beams close to the optical axis are incident to the homogenizer 101 in a divergent mode, wherein the light beams far away from the optical axis are respectively and correspondingly incident to the second homogenizing zone 101b, and the energy in the diagonal space range is redistributed.
The above-described homogenizer 101 includes a first homogenizing zone 101a and second homogenizing zones 101b located on both sides of the first homogenizing zone 101a in the slow axis direction are only examples given by the present application and are not limiting of the present application. For example, the homogenizer 101 may further comprise a third homogenizing zone, a fourth homogenizing zone, etc., as the case may be. When homogenizer 101 includes three or more homogenizing zones, each of the homogenizing zones is symmetrically disposed. The application comprises three homogenizing areas, wherein a first homogenizing area 101a is positioned at the center, and two second homogenizing areas 101b are symmetrically distributed by taking the first homogenizing area 101a as the center; when an odd number of homogenization areas is included, and so on in the arrangement of the application. For example, when five homogenizing zones are included, the first homogenizing zone 101a is located at the center, two second homogenizing zones 101b are distributed on both sides of the first homogenizing zone 101a, two third homogenizing zones are distributed on both sides of the first homogenizing zone 101a, and the two second homogenizing zones 101b are respectively located on one side of the two second homogenizing zones 101b away from the first homogenizing zone 101a, and the surface types of the first homogenizing zone 101a, the second homogenizing zone 101b and the third homogenizing zone are different. When the homogenizer 101 includes an even number of homogenizing zones, for example, four homogenizing zones, the first homogenizing zone 101a, the second homogenizing zone 101b, the third homogenizing zone and the fourth homogenizing zone are sequentially disposed, and the surface shapes of the first homogenizing zone 101a and the fourth homogenizing zone are the same, and the surface shapes of the second homogenizing zone 101b and the third homogenizing zone are the same. The plurality of homogenizing mirrors are disposed in the same way, and will not be described herein.
And, the fast axis of the incident light of the homogenized environment is a collimated light beam and the numerical aperture of the slow axis light beam is equal to or smaller than the numerical aperture of the first homogenizing zone 101 a.
Whether it is presented in the form of the first homogenizing lens or the first homogenizing zone 101a, the prism 102 is correspondingly disposed on the light emitting side of the first homogenizing lens or the first homogenizing zone 101a, in other words, the prism 102 is disposed in the middle of the optical axis, receives the light beam close to the optical axis, and has high energy density, belongs to the middle-intensity part, so that the energy of the middle-intensity part is divided and rearranged by the prism 102, and the shaping of the angular space 'mountain' -shaped distribution is completed, as shown in fig. 4.
The prism 102 is a polyhedron for dividing and rearranging the energy of the medium intensity portion emitted through the homogenizer 101. As shown in fig. 5, the light incident surface of the prism 102 in the embodiment of the present application includes a first prism surface 102a and a second prism surface 102b located on at least one of two sides of the first prism surface 102a along the slow axis direction, an included angle β is formed between the first prism surface 102a and the slow axis direction, an energy trend of the middle position of the light spot is determined by the included angle β, an included angle α is formed between the second prism surface 102b and the slow axis direction, and energy trends of two sides of the light spot are determined by the included angle α.
The prism 102 in fig. 5 includes a first prism surface 102a and two second prism surfaces 102b, and the prism 102 segments and rearranges the energy of the middle strong part of the "mountain" energy distribution, where the angle α of the prism 102 can change the "mountain" direction of the two sides of the "mountain", and the angle α is smaller, and the "mountain" direction moves toward the middle; the included angle alpha becomes larger, and the peak points to move to two sides; while the included angle beta of the prism 102 is related to the middle strength direction, the included angle beta is smaller, and the middle strength direction moves towards 0 angle; the included angle beta becomes larger, and the middle strength direction moves towards the two sides far from 0 angle. Therefore, the preset mountain-shaped energy distribution can be obtained by changing the included angles alpha and beta. For example, the angle α is made smaller, the angle β is made smaller, the distribution curve after changing the angle is as shown in fig. 6, the "peak" direction moves toward the middle, and the middle strength direction moves toward 0 angle. In practical application, the mountain-shaped energy distribution can be set by adjusting the angles alpha and beta, so as to meet the requirement of angle distribution characteristics required by detection.
By adopting the homogenizer 101 in the slow axis direction, the light beam is made to enter the homogenizer 101 in a segmented way along the slow axis direction, the light beam close to the optical axis enters the first homogenizing mirror or the first homogenizing zone 101a positioned on the optical axis, the light beams at two sides of the optical axis respectively enter the second homogenizing mirror or the second homogenizing zone 101b positioned at two sides of the first homogenizing mirror or the first homogenizing zone 101a correspondingly, the energy in the angular space range is redistributed, the energy in the middle-strong part is segmented and rearranged by matching with the prism 102, the light beam shaping is realized, the mountain-shaped distribution of the angular space is realized, and the energy of the middle-strong light beam is fully utilized.
The prism 102 includes a first prism surface 102a and two second prism surfaces 102b, which correspond to three peaks of a mountain shape; in addition, the prism 102 may have only one prism face, and correspondingly, the mountain shape has only one peak; if the prism 102 has only two prism faces, the corresponding mountain shape also has two peaks; in other words, the number of facets of the prism 102 corresponds to the number of peaks of the "mountain" shape.
For example, when the prism 102 has only two facets, as shown in fig. 7, the prism 102 includes a first facet 102a and a second facet 102b, and in this case, referring to fig. 8, the incident light enters the prism 102 after passing through the homogenizer 101, so that the energy distribution shown in fig. 9 can be formed, and the "mountain" shape in fig. 9 has only two peaks, which correspond to only two facets of the prism 102. Changing the shape of the prism 102 into only two facets in fig. 7, the second facet 102b corresponding to the included angle α is reduced, and meanwhile, the light transmission length (the length in the vertical direction in fig. 7) of the first facet 102a corresponding to the included angle β is increased, and as shown in fig. 9, the number of "peaks" is reduced by one, and the height of the middle "peak" is increased in cooperation with the spatial energy distribution of the beam angle shaped by the homogenizer 101. It can be seen that the number, intensity and position distribution of the "mountain" peaks can be changed by changing the shape of the prism 102, and those skilled in the art can set the shape according to actual needs to meet the needs of different scenes.
On the other hand, the embodiment of the application also provides an optical shaping device which comprises a laser light source and the optical shaping module. Wherein the laser light source may be a multi-channel edge-emitting laser light source.
The optical shaping device can be applied to a laser radar system, and the embodiment of the application provides the laser radar system.
When the laser beam is applied to a laser emission system of the automobile LiDAR, vignetting defects are made up through the formed mountain-shaped energy distribution, medium-intensity energy can be fully utilized, and the detection distance of the automobile LiDAR is increased.
The optical shaping device and the laser radar system have the same structure and beneficial effects as the optical shaping module in the previous embodiment. The structure and the beneficial effects of the optical shaping module have been described in detail in the foregoing embodiments, and are not described herein again.
The above is only an alternative embodiment of the present application, and is not intended to limit the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

Claims (10)

1. An optical shaping module is characterized by comprising a homogenizer and a prism which are arranged along the optical axis of a laser light source;
the incident light enters the homogenizer to be emitted at different divergence angles, and the incident light is partially overlapped in an angular space, so that the energy distribution of the light beam of the incident light in the angular space range is realized;
the prism performs segmentation rearrangement on the medium-intensity energy after passing through the homogenizer, and emits light spots with strong energy distribution in the middle, second-intensity at two ends and weak areas between the middle and the two ends in the slow axis direction.
2. The optical shaping module according to claim 1, wherein the homogenizer comprises a first homogenizing mirror and a second homogenizing mirror located at two sides of the first homogenizing mirror along the slow axis direction, the first homogenizing mirror and the second homogenizing mirror have different surface types, and the prism is correspondingly arranged at the light emitting side of the first homogenizing mirror.
3. The optical shaping module according to claim 2, wherein the fast axis of the incident light is a collimated beam and the slow axis beam has a numerical aperture less than or equal to the numerical aperture of the first homogenizing environment.
4. The optical shaping module according to claim 1, wherein the homogenizer comprises a homogenizing mirror, a first homogenizing region and a second homogenizing region located at two sides of the first homogenizing region along the slow axis direction are divided on the homogenizing mirror, the surface types of the first homogenizing region and the second homogenizing region are different, and the prism is correspondingly arranged at the light emitting side of the first homogenizing region.
5. The optical shaping module according to claim 4, wherein the fast axis of the incident light of the homogenizing environment is a collimated beam and the numerical aperture of the slow axis beam is less than or equal to the numerical aperture of the first homogenizing zone.
6. The optical shaping module according to claim 1, wherein the light incident surface of the prism includes a first prism surface and a second prism surface located on at least one of two sides of the first prism surface along the slow axis direction, an included angle β is formed between the first prism surface and the slow axis direction, and an included angle α is formed between the second prism surface and the slow axis direction.
7. The optical shaping module according to claim 6, wherein the energy trend of the middle position of the light spot is determined by the angle β.
8. The optical shaping module according to claim 6, wherein the energy trend of the positions on both sides of the light spot is determined by the included angle α.
9. An optical shaping device comprising a laser light source, characterized in that it further comprises an optical shaping module according to any one of claims 1 to 8.
10. A lidar system comprising the optical shaping device of claim 9.
CN202210492846.6A 2022-05-07 2022-05-07 Optical shaping module, device and laser radar system Pending CN117055234A (en)

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