CN115268094A - Optical module and laser module - Google Patents

Abstract

The invention provides an optical module and a laser module, which belong to the technical field of light spot superposition and comprise an array lens group and a wedge-shaped lens group which are sequentially arranged along a main optical axis, wherein the array lens group comprises a first array lens and a second array lens which are sequentially arranged along a first direction vertical to the main optical axis, the wedge-shaped lens group is arranged at the light emitting side of the first array lens and/or the second array lens, laser beams output angular space flat-top light spots with the same divergence angle through the array lens group, and the angular space flat-top light spots are refracted by the wedge-shaped lens group to form superposed light spots of an angular space in a far field. Through setting up array lens group and wedge group to according to the different change combinations of array lens group and wedge group, can form the stack facula of different effects, the facula form is diversified, and the flexibility is high, adaptable different demand, through above-mentioned three optical element, realizes different facula stacks, and optical module compact structure, small size, with low costs, and the restriction to the light source is few.

Description

An optical module and a laser module

This application is based on the application number 202010876460.6, the application date is August 27, 2020, the applicant is "Xi'an Focuslight Technology Co., Ltd.", and the invention name is "an optical module and a laser module". case application.

technical field

The present invention relates to the technical field of spot superposition, in particular to an optical module and a laser module.

Background technique

At present, Lidar (Lidar) mainly implements the application of superimposed spots in two ways: one is through the diffraction element (DOE), such as the diffraction element disclosed in patent 201811051292.6 and its application in the Lidar system, with the help of incoherent laser When illuminated independently of each other, non-interfering diffraction patterns are generated in the far field as the total diffraction pattern. The other is to oscillate the light source so that the light source is irradiated at different angles to realize the superposition of far-field laser beams.

However, the above two methods have their disadvantages. When the DOE element realizes the superimposition of point-like spots, there are restrictions on the wavelength and type of the light source; and the placement angle of the light source will lead to an uncompact structure of the entire optical system and a large size of the light outlet.

Contents of the invention

The object of the present invention is to provide an optical module and a laser module, which can realize different superimposition of light spots, have less restrictions on the light source, and the optical module has a compact structure.

Embodiments of the present invention are achieved like this:

On the one hand, an embodiment of the present invention provides an optical module, which includes an array lens group and a wedge mirror group arranged in sequence along the main optical axis, and the array lens group includes array lenses arranged in sequence along a first direction perpendicular to the main optical axis. The first array lens and the second array lens, the wedge mirror group is arranged on the light exit side of the first array lens and/or the second array lens, and the laser beam outputs the same divergence angle through the array lens group A flat-top light spot in an angular space, where the flat-top light spot in an angular space is refracted by the wedge mirror group to form a superimposed light spot in an angular space in the far field.

Optionally, the first array lens and the second array lens have the same focal length and surface shape.

Optionally, the first array lens and the second array lens are integrally structured.

Optionally, the wedge mirror group is arranged on the light exit side of the first array lens or the second array lens, and the wedge mirror group includes a first wedge mirror and a first wedge mirror sequentially connected along the arrangement direction of the array lens group. Second wedge mirror.

Optionally, the wedge mirror group includes a first wedge mirror and a second wedge mirror sequentially connected along the arrangement direction of the array lens group, the first wedge mirror corresponds to the light exit side of the first array lens, so The second wedge mirror corresponds to the light emitting side of the second array lens.

Optionally, it also includes a collimating mirror arranged along the main optical axis, and the collimating mirror is located on the side of the array lens group away from the wedge mirror group; it also includes a collimating mirror arranged on the main optical axis A compression mirror, the compression mirror is located between the collimator mirror and the array lens group.

Optionally, a reflector disposed on the main optical axis is further included, and the reflector is located on a side of the array lens group away from the wedge mirror group, and is used to adjust the propagation path of the light beam.

Optionally, the first array lens and the second array lens are arranged at a preset angle, and the preset angle is between 0° and 90°.

Optionally, the wedge angle of the first wedge mirror is not equal to the wedge angle of the second wedge mirror.

Optionally, the first array lens and/or the second array lens are both cylindrical array lenses or sawtooth arrays; the array lens group further includes For the third array lens between the two array lenses, the incident surface or the outgoing surface of the third array lens is a serrated surface or a cylindrical surface.

Optionally, a hyperboloid mirror and a plano-convex mirror are sequentially provided along the direction of the main optical axis, and both the hyperboloid mirror and the plano-convex mirror make the laser beam emit along the first direction, and the hyperboloid mirror Both the mirror and the plano-convex mirror are located on the side of the array lens group away from the wedge mirror group.

Another aspect of the embodiments of the present invention provides an optical module, which includes the above-mentioned optical module, and a first laser light source and a second laser light source arranged along the first direction, and the first laser light source and the second laser light source The laser light sources respectively correspond to the first array lens and the second array lens of the optical module.

The beneficial effects of the embodiments of the present invention include:

In the optical module and the laser module provided by the embodiments of the present invention, the laser beam emitted by the laser light source is emitted through the array lens group and the wedge mirror group in sequence. An array lens and a second array lens are used to output the flat-top light spot in the angular space with the same beam angle, and the flat-top light spot in the angular space is refracted by the wedge mirror group to adjust the distribution position of the line light spot in the angular space and form an angular space in the far field superimposed flare. By setting the array lens group and the wedge mirror group, and according to the different combinations of the array lens group and the wedge mirror group, superimposed light spots with different effects can be formed. One optical element realizes superposition of different light spots. The optical module has compact structure, small size, low cost, and less restrictions on the light source.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is one of the structural schematic diagrams of the optical module provided by the embodiment of the present invention;

Fig. 2 is the light path diagram of the slow axis direction of Fig. 1;

Fig. 3 is the light path diagram of the fast axis direction of Fig. 1;

Fig. 4 is the second schematic diagram of the structure of the optical module provided by the embodiment of the present invention;

Fig. 5 is the superimposed spot formed in Fig. 4;

Fig. 6 is the third schematic diagram of the structure of the optical module provided by the embodiment of the present invention;

Fig. 7 is the light path diagram of the slow axis direction of Fig. 6;

Fig. 8 is the light path diagram of the fast axis direction of Fig. 6;

Fig. 9 is the fourth schematic diagram of the structure of the optical module provided by the embodiment of the present invention;

Fig. 10 is the optical path diagram of the slow axis direction of Fig. 9;

Figure 11 is the superimposed spot formed in Figure 9;

Fig. 12 is the light path diagram of the fast axis direction of Fig. 9;

Fig. 13 is an optical path diagram of an optical module provided by an embodiment of the present invention;

Figure 14 is the superimposed spot formed in Figure 13;

FIG. 15 is the fifth schematic diagram of the structure of the optical module provided by the embodiment of the present invention.

Icon: 100-collimating mirror; 101-the first collimating mirror; 102-the second collimating mirror; 200-compression mirror; 201-the first compression mirror; 202-the second compression mirror; 300-array lens group; 301 -first array lens; 302-second array lens; 303-third array lens; 400-wedge mirror group; 401-first wedge mirror; 402-second wedge mirror; 500-converging lens; ; 700-plano-convex mirror; 800-mirror; 801-first mirror; 802-second mirror; 900-adjusting lens.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

Please refer to FIG. 1 , the present embodiment provides an optical module, which includes an array lens group 300 and a wedge mirror group 400 arranged in sequence along the main optical axis, and the array lens group 300 includes an array lens group arranged in sequence along a first direction perpendicular to the main optical axis. The first array lens 301 and the second array lens 302, the wedge mirror group 400 is arranged on the light exit side of the first array lens 301 and/or the second array lens 302, and the laser beam forms an angular space with different beam angles through the array lens group 300 The flat-top light spot, the flat-top light spot in the angular space is refracted by the wedge mirror group 400 to form a superimposed light spot in the angular space in the far field.

It may also include a collimating mirror 100 arranged along the main optical axis, and the collimating mirror 100 is located on a side of the array lens group 300 away from the wedge mirror group 400 . The collimating mirror 100 is used to collimate the laser beam. The laser light source emits a laser beam, and the laser beam passes through the collimating mirror 100 , the array lens group 300 and the wedge mirror group 400 in sequence.

Wherein, the collimating mirror 100 includes a fast-axis collimating mirror, or the collimating mirror 100 includes a fast-axis collimating mirror and a slow-axis collimating mirror.

The array lens group 300 includes a first array lens 301 and a second array lens 302 sequentially arranged along a first direction perpendicular to the main optical axis. The first direction can be parallel to the main optical axis or perpendicular to the main optical axis.

The array directions of the first array lens 301 and the second array lens 302 are both the same as the first direction of the main optical axis, and are arrayed along the first direction.

The first array lens 301 and the second array lens 302 can be integrated as shown in FIG. 1 to form an array lens group 300 , or they can be arranged side by side symmetrically on both sides of the main optical axis as shown in FIG. 4 .

It is also possible that, as shown in FIG. 13 , the first array lens 301 and the second array lens 302 can also be located on both sides of the main optical axis and staggered.

After the collimating mirror 100 collimates the laser beam emitted by the laser light source, it enters the first array lens 301 and the second array lens 302 to output flat-hat spots with different beam angles.

Furthermore, the surface types of the first array lens 301 and the second array lens 302 are different, or the focal lengths of the first array lens 301 and the second array lens 302 are different. Surface types include spherical, aspherical, cylindrical (including ellipsoidal) and sawtooth surfaces.

The wedge mirror group 400 is arranged on the light-emitting side of the first array lens 301 and the second array lens 302. As shown in FIG. Wedge mirrors 402 , the first wedge mirror 401 corresponds to the light exit side of the first array lens 301 , and the second wedge mirror 402 corresponds to the light exit side of the second array lens 302 .

Alternatively, the wedge mirror group 400 is arranged on the light-emitting side of the first array lens 301 or the second array lens 302 , and the wedge mirror group 400 includes a first wedge mirror 401 and a second wedge mirror 402 sequentially connected along the arrangement direction of the array lens group 300 . As shown in Figure 13, the wedge mirror group 400 is arranged on one of the light exit side, that is to say, the wedge mirror group 400 is arranged on the light exit side of the first array lens 301 or the wedge mirror group 400 is arranged on the light exit side of the second array lens 302. side.

The wedge mirror group 400 is used to refract the flat-top light spots in angular space with different beam angles formed by the array lens group 300 , and then form superimposed light spots in the far field after passing through the exit surface of the wedge mirror group 400 .

The energy distribution of the superimposed spot is divided into three sections, which are low-energy flat-top distribution on both sides and high-energy flat-top distribution in the middle; or complete overlapping and superposition can be realized to form a complete flat-top energy distribution with equal light intensity; or it can also be realized The two ends are spliced and not superimposed, forming a complete flat-top energy distribution with equal light intensity.

In addition, as shown in FIG. 1 , a compression mirror 200 may also be arranged between the collimating mirror 100 and the array lens group 300 , and the compression mirror 200 may also be arranged on the main optical axis. The compression mirror 200 is used for fine-tuning the optical path, and can correspond to the first direction and the second direction of the laser beam. For example, the collimating mirror 100 collimates the laser beam and emits it along the second direction, and the compression mirror 200 compresses the laser beam and emits it along the first direction. , the first direction is perpendicular to the second direction.

Further, when the collimating mirror 100 is the fast axis collimating mirror 100, at this time, the first direction is the slow axis direction, and the second direction is the fast axis direction, then the compression mirror 200 is the slow axis compression mirror 200, the first The array lens 301 and the second array lens 302 are arranged symmetrically along the slow axis direction perpendicular to the main optical axis, and the array directions of the first array lens 301 and the second array lens 302 are arrayed along the slow axis direction, so that the light output effect is better.

Of course, the first direction can also be the fast axis direction, and the second direction is the slow axis direction, and the settings of each optical element are matched accordingly.

As shown in FIG. 2 , the light path diagram in which the first direction is the slow axis forms the superimposed light spot shown in FIG. 5 . When the first direction is the fast axis, its optical path diagram is shown in FIG. 3 .

In addition, the collimating mirror 100 includes a first collimating mirror 101 and a second collimating mirror 102, and both the first collimating mirror 101 and the second collimating mirror 102 collimate and emit the laser beam along the second direction; and/or, The compression mirror 200 includes a first compression mirror 201 and a second compression mirror 202. Both the first compression mirror 201 and the second compression mirror 202 compress and emit the laser beam along a first direction.

One situation is: the collimating mirror 100 and the compression mirror 200 can comprise two lenses respectively, as shown in Figure 4, the collimating mirror 100 comprises the first collimating mirror 101 and the second collimating mirror 102, the first collimating mirror 101 and the second collimating mirror 102. Both the mirror 101 and the second collimating mirror 102 collimate and emit the laser beam along the second direction.

The compression mirror 200 includes a first compression mirror 201 and a second compression mirror 202. Both the first compression mirror 201 and the second compression mirror 202 compress and emit the laser beam along a first direction.

When the collimating mirror 100 is divided into two lenses, namely including the first collimating mirror 101 and the second collimating mirror 102, correspondingly, the laser light source can also be two, and the two laser light sources are located at the first collimating mirror respectively. 101 and the incident surface of the second collimating mirror 102 to emit laser beams to the first collimating mirror 101 and the second collimating mirror 102 respectively.

In this way, the first collimating mirror 101 and the second collimating mirror 102 can be arranged in connection or staggered to form different light spot superposition effects.

The second situation is: the collimating mirror 100 includes a first collimating mirror 101 and a second collimating mirror 102, and there is only one compression mirror 200 (not shown in the figure).

The third situation is: as shown in FIG. 6 , there is one collimating mirror 100 , and the compression mirror 200 includes a first compression mirror 201 and a second compression mirror 202 .

In the optical module provided by the embodiment of the present invention, the laser beam emitted by the laser light source is emitted through the collimating mirror 100, the array lens group 300 and the wedge mirror group 400 in sequence, the collimating mirror 100 collimates the laser beam, and the array lens group 300 includes The first array lens 301 and the second array lens 302 arranged in sequence along the first direction perpendicular to the main optical axis, the surface types and focal lengths of the first array lens 301 and the second array lens 302 are different, so as to output different beam angles Flat-top light spot in angular space, the flat-top light spot in angular space is refracted by wedge mirror group 400 to adjust the distribution position of line light spot in angular space, and form superimposed light spot in angular space in the far field. By setting the array lens group 300 and the wedge mirror group 400, and according to the different combinations of the array lens group 300 and the wedge mirror group 400, superimposed light spots with different effects can be formed, the light spot forms are diversified, the flexibility is high, and it can adapt to different needs , through the above three optical elements, different light spot superposition is realized, the optical module has compact structure, small size, low cost, and less restrictions on the light source.

As shown in Figure 13, when the wedge mirror group 400 is arranged on the light-emitting side of the first array lens 301 or the second array lens 302, the wedge mirror group 400 includes the first wedge mirror 401 and the second wedge mirror 400 which are sequentially connected along the direction in which the array lens group 300 is arranged. Two wedge mirrors 402.

The first wedge mirror 401 and the second wedge mirror 402 are sequentially connected along the arrangement direction of the array lens group 300 , and the first wedge mirror 401 and the second wedge mirror 402 may also be integrated. There are 400 array mirrors corresponding to the refraction in the wedge mirror group.

For example, as shown in FIG. 13 , it is an optical path diagram in the direction of the slow axis. Two laser light sources are provided, which are respectively located on the incident surfaces of the first collimating mirror 101 and the second collimating mirror 102. One laser beam passes through the first collimating mirror Straight mirror 101, first compression mirror 201, first array lens 301 and wedge mirror group 400 exit light spot; Another laser beam passes through second collimating mirror 102, second compression mirror 202, second array lens 302 exit light spot, two Finally, the laser beams form superimposed spots in the far field.

Wherein, the curvatures of the first array lens 301 and the second array lens 302 are different, so that the distribution of the line spot forms an angular spatial misalignment. The wedge mirror group 400 is only used to shape the split beam of the first array lens 301 , and cut its light spot into two parts, one of which overlaps with the part of the light spot emitted by the second array lens 302 .

Further, it also includes a mirror 800 arranged on the main optical axis. The mirror 800 is located on the side of the array lens group 300 away from the wedge mirror group 400, and is used to adjust the path of the beam propagation. The path of adjusting the beam propagation includes but is not limited to The change of the propagation direction of the beam, or the translation of the beam in the direction parallel to the optical axis, or the conversion of the fast axis and the slow axis of the laser, specifically the conversion of the divergence angle of the fast axis and the slow axis.

Exemplarily, the mirror 800 is located between the second compression mirror 202 and the second array lens 302 .

As shown in Figure 13 and Figure 15, when the two light sources are arranged in a staggered manner, or the placement angle of the two light sources can be changed, the direction of the optical path is changed through the reflector 800, so that the laser beam emitted by the light source enters the second laser beam after passing through the reflector 800. array lens 302 . Fig. 14 is the far-field distribution of the light spot corresponding to Fig. 13, showing three separated linear light spots and their energy distribution.

The number of reflectors 800 and the position of setting are not limited. The first reflector 801 and the second reflector 802 are set in FIG. After passing through the second collimating mirror 102 and the second compressing mirror 202 , the light beam can enter the second array lens 302 through the reflecting mirror 800 .

An adjustment lens 900 may also be provided between the reflection mirror 800 and the second array lens 302 , and adjust the laser beam to enter the second array lens 302 .

When the light emitting sides of the first wedge mirror 401 and the second wedge mirror 402 are correspondingly provided with wedge mirrors, as shown in FIG. 4 , the wedge mirror group 400 may include the first wedge mirror 401 and the The second wedge mirror 402, the first wedge mirror 401 corresponds to the light exit side of the first array lens 301, refracts the laser beam through the first array lens 301, and the second wedge mirror 402 corresponds to the light exit side of the second array lens 302 , to refract the laser beam passing through the second array lens 302 .

The wedge angle of the first wedge mirror 401 and the wedge angle of the second wedge mirror 402 may be equal or unequal. When they are equal, the angles of refraction are the same; when they are not equal, the angles of refraction are different, so that the outgoing laser beams form different superposition effects.

For example, as shown in Figure 2, the wedge angle of the first wedge mirror 401 and the wedge angle of the second wedge mirror 402 are not equal, that is, the slope of the wedge surface of the first wedge mirror 401 and the wedge surface of the second wedge mirror 402 slopes are not equal. FIG. 7 shows a state where the wedge angle of the first wedge mirror 401 is equal to the wedge angle of the second wedge mirror 402 .

The wedge angle of the first wedge mirror 401 and the wedge angle of the second wedge mirror 402 are placed opposite to each other or facing away from each other.

When placed on the back, the first wedge mirror 401 and the second wedge mirror 402 can be integrated, or the first wedge mirror 401 and the second wedge mirror 402 are two separate pieces, or the first wedge mirror 401 and the second wedge mirror 402 Add flat glass in between as a transition.

As shown in FIG. 6 and FIG. 7 , the first array lens 301 and the second array lens 302 are arranged at a preset angle, and the preset angle is between 0° and 90°.

That is to say, there is an included angle between the first array lens 301 and the second array lens 302 and the main optical axis, so that the first array lens 301 and the second array lens 302 are arranged at a preset included angle. The included angle between the first array lens 301 and the main optical axis and the included angle between the second array lens 302 and the main optical axis may be equal or unequal. Further, the laser beam passing through the array lens group 300 forms angular space flat-top spots with different beam angles, so that the superposition effect of the spots is diversified.

A converging lens 500 may also be provided between the compression mirror 200 and the array lens group 300 for converging the laser beam emitted from the compression mirror 200 .

When the first direction is the slow axis, its optical path diagram is shown in FIG. 7 , and FIG. 8 is the optical path diagram in the fast axis direction.

In addition, both the first array lens 301 and/or the second array lens 302 are cylindrical array lenses or sawtooth arrays.

Furthermore, as shown in FIGS. 9 and 10 , the first array lens 301 and the second array lens 302 may both be biconvex array lenses. Between the third array lens 303 and the second array lens 302 , the incident surface or the outgoing surface of the third array lens 303 is a sawtooth surface, and the arrangement direction of the sawtooth is the same as the array direction of the first array lens 301 . The incident surface or the outgoing surface of the third array lens 303 may also be a cylindrical surface. Wherein, the first array lens 301 and the second array lens 302 have the same curvature, and the third array lens 303 has a different curvature from the first array lens 301 and the second array lens 302 .

The biconvex array lenses of the first array lens 301 and the second array lens 302 are used to form a flat-top angle distribution in angular space, and divide the laser beam according to the slope of the sawtooth and the arrangement density of the sawtooth.

For example, the angular area occupied by each part of the zigzag array lens of the third array lens 303 in the middle is <0.1°, and the laser beam is divided into 0.1° area and deflected to realize the lattice distribution in the angular space.

Along the main optical axis direction, a hyperboloid mirror 600 and a plano-convex mirror 700 are sequentially arranged. The hyperboloid mirror 600 and the plano-convex mirror 700 are all located on the side of the array lens group 300 away from the wedge mirror group 400. Specifically, between the collimating mirror 100 and the array lens group Hyperbolic mirrors 600 and plano-convex mirrors 700 are sequentially arranged between the lens groups 300, and the hyperbolic mirrors 600 and plano-convex mirrors 700 all make the laser beam emit along the first direction.

For example, as shown in FIG. 10, when the first direction is the slow axis, that is, the hyperbolic mirror 600 is the slow axis hyperbolic mirror 600, and the plano-convex mirror 700 is the slow-axis plano-convex mirror 700, forming the superimposed facula shown in FIG. 11 . Certainly, the first direction may also be the fast axis, and FIG. 12 is an optical path diagram in the fast axis direction.

As shown in Figure 10, the laser light source emits a laser beam, which is collimated by a fast-axis collimating mirror 100, and then exits on a slow-axis plano-convex mirror 700 through a slow-axis hyperbolic mirror 600, wherein the slow-axis hyperbolic mirror The 600 has a Gaussian flattening effect on the laser light source, and the slow-axis plano-convex mirror 700 collimates the laser beam, and the collimated laser beam enters the array lens group 300 .

The array lens group 300 includes a first array lens 301, a second array lens 302, and a third array lens 303. The first array lens 301 and the second array lens 302 are respectively located on both sides of the main optical axis, and are composed of biconvex micro-units. , the laser beams entering the first array lens 301 and the second array lens 302 are all focused on the second convex surface after passing through the first convex surface, which can form a uniform spot; the third array lens 303 is a sawtooth array lens, and its function is for The light beam undergoes small-angle differentiation and cutting deflection; the surface shape and focal length of the first array lens 301 and the second array lens 302 can be the same or different (that is, the output divergence angle of the laser beam is the same or different).

After the collimated laser beam enters the array lens group 300, the laser beam will be divided into three parts, the upper and lower parts correspond to the first array lens 301 and the second array lens 302, and the output forms a flat-top light field under an angular space with a certain divergence angle; The serrated array lens (the third array lens 303 ) located in the middle divides the laser beam into micro-angle laser beams and deflects them to form uniform point distribution in angular space. The three laser beams passing through the array lens group 300, the laser beams emitted by the first array lens 301 and the second array lens 302, and then the corresponding first wedge mirror 401 and the second wedge mirror 402 reverse the light field of the laser beam. Direction deflection, the point light field spot formed by the third array lens 303 in the middle is output directly, and finally forms the combined light field with line spots on both sides and point spots in the middle in Fig.

In summary, the optical module provided in this embodiment can form superimposed light spots with different effects by setting the array lens group 300 and the wedge mirror group 400, and according to the different combinations of the array lens group 300 and the wedge mirror group 400, the form of the light spot Diversification, high flexibility, can adapt to different needs, and the optical module has compact structure, small size and low cost.

This embodiment also provides a laser module, including the above-mentioned optical module, and the first laser light source and the second laser light source arranged along the first direction, and the optical modules respectively corresponding to the first laser light source and the second laser light source The first array lens 301 and the second array lens 302.

As shown in Figure 13, two laser light sources are provided, respectively positioned on the incident surfaces of the first collimating mirror 101 and the second collimating mirror 102, and the first laser light source passes through the first collimating mirror 101, the first compression mirror 201, The first array lens 301 and the wedge mirror group 400 emit the light spot; the second laser light source passes through the second collimating mirror 102, the second compression mirror 202, and the second array lens 302 to emit the light spot, and the two laser beams finally form a superimposed light spot in the far field .

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. An optical module, characterized in that it includes an array lens group and a wedge mirror group arranged in sequence along the main optical axis, and the array lens group includes a first direction arranged in turn along a first direction perpendicular to the main optical axis. An array lens and a second array lens, the wedge mirror group is arranged on the light exit side of the first array lens and/or the second array lens, and the laser beam passes through the array lens group to output an angular space with the same divergence angle A flat-top light spot, the angular-space flat-top light spot is refracted by the wedge mirror group to form an angular space superimposed light spot in the far field. 2. The optical module according to claim 1, wherein the focal length and surface shape of the first array lens and the second array lens are the same. 3 . The optical module according to claim 1 , wherein the first array lens and the second array lens are integrated. 4 . 4. The optical module according to claim 1, wherein the wedge mirror group is arranged on the light emitting side of the first array lens or the second array lens, and the wedge mirror group includes The array lens group is provided with a first wedge mirror and a second wedge mirror connected in sequence. 5. The optical module according to claim 1, wherein the wedge mirror group comprises a first wedge mirror and a second wedge mirror sequentially connected along the arrangement direction of the array lens group, and the first wedge mirror Corresponding to the light emitting side of the first array lens, the second wedge mirror corresponds to the light emitting side of the second array lens. 6. The optical module according to any one of claims 1-5, further comprising a collimating mirror arranged along the main optical axis, the collimating mirror is located at a distance from the array lens group One side of the wedge mirror group; also includes a compression mirror arranged on the main optical axis, the compression mirror is located between the collimator mirror and the array lens group. 7. The optical module according to any one of claims 1-5, further comprising a reflector disposed on the main optical axis, the reflector is located at the array lens group away from the wedge One side of the mirror group is used to adjust the path of the beam propagation. 8. The optical module according to claim 1, wherein the first array lens and the second array lens are arranged at a preset angle, and the preset angle is between 0° and 90° . 9. The optical module according to claim 4 or 5, wherein the wedge angle of the first wedge mirror is not equal to the wedge angle of the second wedge mirror. 10. The optical module according to any one of claims 1-5, characterized in that, the first array lens and/or the second array lens are both cylindrical array lenses or sawtooth arrays; The array lens group further includes a third array lens arranged between the first array lens and the second array lens, and the incident surface or the outgoing surface of the third array lens is a serrated surface or a cylindrical surface. 11. The optical module according to claim 10, wherein a hyperboloid mirror and a plano-convex mirror are sequentially provided along the direction of the main optical axis, and both the hyperboloid mirror and the plano-convex mirror make the laser The light beam is emitted along the first direction, and both the hyperboloid mirror and the plano-convex mirror are located on a side of the array lens group away from the wedge mirror group. 12. A laser module, characterized in that it comprises the optical module according to any one of claims 1-11, and a first laser light source and a second laser light source arranged along the first direction, the The first laser light source and the second laser light source respectively correspond to the first array lens and the second array lens of the optical module.

Images