Uniform light collimating lens module

Abstract

The utility model discloses a dodging collimating lens module which comprises a laser light source used for emitting laser beams, a first lens and a second lens, the first lens and the second lens are sequentially arranged in the propagation direction of the laser beams, the laser beam incident surface of the first lens is a plane or a spherical surface, and the laser beam emergent surface of the first lens is a free-form surface. The laser beam incident surface of the second lens is a free-form surface, the laser beam emergent surface of the second lens is a plane or a spherical surface, the first lens is a rectangular lens, and the second lens is a circular lens. According to the technical scheme provided by the embodiment of the utility model, through the synergistic effect of the first lens and the second lens, the laser beams output by the laser light source are effectively collimated and dodging, and finally, the maximum and minimum illumination difference of the shaped laser beams on a target surface is controlled within 15%; and the high requirements on the collimation and uniformity of the laser beam are met.

Description

Technical Field

[0001] This utility model relates to the field of optical engineering technology, and in particular to a uniform collimating lens module. Background Technology

[0002] Laser technology has wide applications in many fields such as industrial processing, medical equipment, and scientific research. However, traditional laser systems rely on a single lens for laser beam shaping, resulting in a relatively concentrated laser beam with uneven energy distribution, which makes it difficult to meet the high requirements for laser beam collimation and uniformity. Utility Model Content

[0003] This invention provides a uniform collimating lens module to improve the collimation and uniformity of laser beams.

[0004] According to one aspect of the present invention, a uniform collimating lens module is provided, comprising:

[0005] A laser source used to emit laser beams;

[0006] A first lens and a second lens are placed sequentially in the propagation direction of the laser beam;

[0007] The laser beam incident surface of the first lens is a plane or a sphere;

[0008] The laser beam exit surface of the first lens is a freeform surface;

[0009] The laser beam incident surface of the second lens is a freeform surface;

[0010] The laser beam exit surface of the second lens is either a plane or a spherical surface;

[0011] The first lens is a rectangular lens, and the second lens is a circular lens.

[0012] Optionally, the laser beam exit surface of the first lens is concave;

[0013] The laser beam incident surface of the second lens is convex.

[0014] Optionally, the laser beam incident surface of the first lens is a plane;

[0015] The laser beam exit surface of the second lens is a plane.

[0016] Optionally, an anti-reflection coating is provided on the laser beam incident surface of the first lens, the laser beam exit surface of the first lens, the laser beam exit surface of the second lens, and the laser beam incident surface of the second lens.

[0017] Optionally, the first lens is a plastic lens, or the material of the first lens includes plastic and glass;

[0018] The second lens is a plastic lens, or the material of the second lens includes plastic and glass.

[0019] Optionally, the first lens has a blackened side surface.

[0020] Optionally, the diameter of the second lens is greater than the length of the first lens;

[0021] The distance between the laser beam incident surface of the first lens and the laser beam exit surface of the second lens is less than or equal to 30 mm.

[0022] Optionally, the laser beam emitted by the laser source has an elliptical shape;

[0023] The laser beam, after being shaped by the homogenizing collimating lens module, has a circular spot shape.

[0024] Optionally, the power of the laser source is from 5mW to 200mW.

[0025] Optionally, the diameter of the laser beam spot after being shaped by the uniform collimating lens module is 3mm to 10mm.

[0026] In this embodiment of the invention, the first lens serves to refract and disperse light, while also acting as an aperture stop. It selectively incorporates laser energy into the entire homogenizing and collimating lens module, ensuring a high laser power utilization rate (≥75%) while simultaneously achieving both collimation and homogenization. The second lens L2 achieves collimation and homogenization of the laser beam 20. Through the coordinated work of the first and second lenses, effective collimation and homogenization of the laser beam output from the laser source are achieved. Ultimately, the maximum and minimum illuminance difference of the shaped laser beam on the target surface is controlled within 15%, meeting the high requirements for laser beam collimation and homogenization.

[0027] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the structure of a uniform light collimating lens module provided in an embodiment of this utility model;

[0030] Figure 2 This is a schematic diagram of another uniform light collimating lens module provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of another uniform light collimating lens module provided in an embodiment of the present utility model. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] Figure 1 This is a schematic diagram of the structure of a uniform light collimating lens module provided in an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of another uniform light collimating lens module provided in an embodiment of the present invention. Figure 3 A schematic diagram of another uniform collimating lens module provided in this embodiment of the present invention is shown below. Figures 1-3 As shown, the uniform collimating lens module provided in this embodiment of the present invention includes:

[0036] Laser source 10 is used to emit laser beam 20.

[0037] A first lens L1 and a second lens L2 are placed sequentially in the propagation direction of the laser beam 20.

[0038] The laser beam incident surface of the first lens L1 is either a plane or a sphere.

[0039] The laser beam exit surface of the first lens L1 is a freeform surface.

[0040] The laser beam incident surface of the second lens L2 is a freeform surface.

[0041] The laser beam exit surface of the second lens L2 is either a plane or a sphere.

[0042] The first lens L1 is a rectangular lens, and the second lens L2 is a circular lens.

[0043] Specifically, the laser beam 20 emitted by the laser source 10 is usually Gaussian distributed, and the original laser beam without shaping has the problem of uneven energy distribution.

[0044] Specifically, the laser source 10 can be a laser diode (LD). Laser diodes are small in size, have high electro-optical conversion efficiency, low energy consumption, low maintenance cost, and long service life, making them suitable for integration into various devices, but not limited to this.

[0045] Furthermore, the laser beam 20 emitted by the laser source 10 travels along a specific propagation direction. In order to achieve effective shaping of the laser beam (including collimation and homogenization), a first lens L1 and a second lens L2 are placed sequentially in the propagation direction of the laser beam 20.

[0046] The laser beam incident surface S1 of the first lens L1 is either a plane or a sphere. The plane has the characteristic of no curvature, which is suitable for directly receiving the laser beam 20 from the laser source 10. The sphere has a constant radius of curvature, which is suitable for situations where the beam needs to be initially converged or diverged. Furthermore, by adjusting the radius of curvature of the sphere, the divergence angle or focusing effect of the laser beam 20 can be controlled, thereby better adapting to different types of laser sources and application requirements.

[0047] The laser beam exit surface S2 of the first lens L1 is a freeform surface. A freeform surface is a surface that cannot be simply described by traditional geometric shapes such as spheres or cylinders. Freeform surfaces are usually defined by complex mathematical models (such as partial differential equations) and can be customized according to the divergence characteristics of the laser beam 20.

[0048] In this embodiment, the laser beam exit surface S2 of the first lens L1 is a freeform surface. Its main function is to refract and disperse the incident laser beam 20 for the first time, expanding the beam and homogenizing the energy distribution. At the same time, by customizing the design of this freeform surface according to the divergence characteristics of the laser beam 20, the energy distribution of the laser beam 20 can be optimized, making it more uniform, thereby improving the subsequent collimation and homogenization effects.

[0049] Furthermore, the laser beam incident surface S3 of the second lens L2 is a freeform surface, whose main function is to further optimize the laser beam 20 after it has been initially shaped by the first lens L1. This freeform surface can finely adjust the energy distribution of the laser beam 20, making it more uniform, and ensuring that the final output laser beam 20 has high uniformity and collimation.

[0050] The laser beam exit surface S4 of the second lens L2 is a plane or a sphere. The laser beam 20 exits through the plane or sphere of the second lens L2, which helps to ensure that the shaped laser beam 20 can be output in a parallel and collimated manner.

[0051] If the laser beam exit surface S4 of the second lens L2 is a plane, the directionality of the beam can be maintained; if the laser beam exit surface S4 of the second lens L2 is a sphere, the radius of curvature of the sphere can be adjusted as needed to slightly converge or diverge the laser beam 20, and to fine-tune the laser beam 20 to achieve the best collimation effect.

[0052] It should be noted that the aforementioned freeform surface can be an asymmetric freeform surface. An asymmetric freeform surface refers to a surface with different curvature characteristics in different directions. This characteristic allows it to better match the divergence characteristics of the light source and achieve more precise beam shaping. In this embodiment, the laser light source 10, such as a laser diode, typically has asymmetric divergence characteristics (e.g., an elliptical beam). The aforementioned freeform surface adopts an asymmetric freeform surface, which can be customized according to the specific divergence characteristics of the light source. Through its specific curvature design, more efficient energy distribution optimization can be achieved, shaping the asymmetric beam into the desired shape (e.g., a circular flat-top beam).

[0053] Furthermore, the first lens L1 is a rectangular lens, which not only performs preliminary refraction and dispersion of the laser beam 20, but also functions as an aperture. Since the laser beam 20 emitted by the laser source 10 is typically not circular, using a rectangular lens for the first lens L1 allows for more efficient matching of the beam shape, thereby maximizing the utilization of effective light energy while filtering out unwanted portions. Compared to a circular lens, this optimizes light energy utilization, especially when dealing with non-circular beams. Therefore, in this embodiment, the rectangular design of the first lens L1 allows for selective incorporation of laser energy into the homogenizing and collimating lens module, removing unwanted stray light and edge beams, thus helping to balance energy utilization efficiency and collimation and homogenization effects.

[0054] Meanwhile, compared to lenses with more complex shapes, the first lens L1 uses a rectangular lens, which reduces development time and cost, is easier to manufacture, and allows for more precise positioning of the first lens L1 within the uniform collimating lens module. This helps reduce assembly errors and facilitates installation and debugging.

[0055] Furthermore, the first lens L1 shapes the laser beam 20 output from the laser source 10 into a circular or near-circular spot, while the second lens L2 is a circular lens, which can better match the shape of the spot emitted by the first lens L1 and reduce unnecessary optical losses. At the same time, the standardized design of the circular lens makes it easier to find matching accessories and attachments, facilitating integration with other optical components, simplifying the assembly and debugging process of the uniform collimating lens module, and reducing costs and complexity.

[0056] In this embodiment, the first lens L1 not only serves to refract and disperse light but also acts as an aperture stop, selectively incorporating laser energy into the entire homogenizing and collimating lens module, ensuring a high laser power utilization rate (≥75%) while simultaneously achieving both collimation and homogenization effects. Meanwhile, the second lens L2 achieves collimation and homogenization of the laser beam 20. Through the coordinated work of the first lens L1 and the second lens L2, effective collimation and homogenization of the laser beam 20 output from the laser source 10 are achieved. Ultimately, the maximum and minimum illuminance difference of the shaped laser beam 20 on the target surface 30 is controlled within 15%, meeting the high requirements for laser beam collimation and homogenization.

[0057] Optionally, the laser beam exit surface S2 of the first lens L1 is concave, and the laser beam incident surface S3 of the second lens L2 is convex.

[0058] Specifically, the laser beam exit surface S2 of the first lens L1 is a concave freeform surface, which can refract and disperse the incident laser beam 20 for the first time, expand the laser beam 20 and homogenize the energy distribution.

[0059] The laser beam incident surface S3 of the second lens L2 is a convex freeform surface, which, in conjunction with the concave freeform surface of the first lens L1, further optimizes the energy distribution of the laser beam 20, making it more uniform, and ensuring the collimation and uniformity of the final output laser beam 20.

[0060] Among them, the concave freeform surface and the convex freeform surface can be customized according to the specific divergence characteristics of the laser beam 20 to optimize the collimation and uniformity of the laser beam 20.

[0061] Furthermore, the design of the concave freeform surface of the first lens L1 and the convex freeform surface of the second lens L2, while achieving the same collimation and uniformity, allows for greater errors in the optical surface shape. Therefore, even if there are certain errors in the manufacturing process, good collimation and uniformity can be maintained, which reduces the precision requirements in the manufacturing process and helps to reduce manufacturing costs. At the same time, it can tolerate greater assembly errors, making the assembly process more efficient, reducing debugging and calibration time, and helping to improve overall production efficiency.

[0062] Optionally, the laser beam incident surface S1 of the first lens L1 is a plane, and the laser beam exit surface S4 of the second lens L2 is a plane.

[0063] In this design, the laser beam incident surface S1 of the first lens L1 serves as the first contact surface of the entire uniform collimating lens module, used to receive the original laser beam 20 emitted from the laser source 10 (such as a laser diode). The laser beam incident surface S1 of the first lens L1 is planar, and has no refraction effect on the incident laser beam 20, thus not changing the propagation direction of the laser beam 20.

[0064] The laser beam exit surface S4 of the second lens L2 serves as the final output surface of the entire homogenizing and collimating lens module, responsible for outputting the laser beam 20, shaped by the two lenses, to the target area in a collimated form. The planar design of the laser beam exit surface S4 of the second lens L2 avoids further disturbance to the already collimated laser beam 20, helping to maintain its collimation and parallelism. Simultaneously, it reduces defocusing or divergence effects that may be caused by spherical or other complex curved surfaces.

[0065] In this embodiment, the laser beam incident surface S1 of the first lens L1 and the laser beam exit surface S4 of the second lens L2 are both planar, which can simplify the optical structure and reduce the manufacturing difficulty. At the same time, the planar surface is easier to align and install, and the optical axis consistency can be guaranteed without complicated correction methods.

[0066] Optionally, anti-reflective coatings are provided on the laser beam incident surface S1 of the first lens L1, the laser beam exit surface S2 of the first lens L1, the laser beam exit surface S3 of the second lens L2, and the laser beam incident surface S4 of the second lens L2.

[0067] Anti-reflection coating (AR) is an optical coating technology designed based on the principle of multilayer dielectric thin film interference, used to reduce reflection loss of light at the interface between different media. When light enters materials such as glass or plastic from air, partial reflection occurs at the interface, resulting in energy loss and stray light interference. Anti-reflection coating can significantly reduce this reflectivity.

[0068] In this embodiment, by providing anti-reflection coatings on the laser beam incident surface S1, laser beam exit surface S2, laser beam exit surface S3, and laser beam incident surface S4 of the first lens L1, the reflectivity of these surfaces can be reduced, thereby increasing the light transmittance of the first lens L1 and the second lens L2 and improving laser power utilization.

[0069] Furthermore, the anti-reflective coating can reduce unnecessary reflected light, thereby lowering the stray light level inside the uniform collimating lens module. At the same time, it prevents reflected light from interfering with the propagation direction of the main laser beam 20, which helps maintain the collimation and energy uniformity of the laser beam 20, ensuring that the maximum and minimum illuminance difference of the final output spot is ≤15%, thus meeting the high uniformity requirement.

[0070] Optionally, the first lens L1 is a plastic lens, or the material of the first lens L1 includes plastic and glass; the second lens L2 is a plastic lens, or the material of the second lens L2 includes plastic and glass.

[0071] Among them, plastic lenses can be mass-produced through precision injection molding, which is inexpensive, easy to process, and lightweight. At the same time, free-form surfaces are difficult to achieve through traditional glass processing methods, while plastic can be molded in one step, which greatly improves the design freedom and manufacturing efficiency of free-form surface lenses.

[0072] In this embodiment, at least one of the first lens L1 and the second lens L2 is a plastic lens, which facilitates the realization of complex freeform surfaces and has a low cost.

[0073] Furthermore, glass has advantages such as excellent optical properties, high temperature resistance, wear resistance, good chemical stability, and long lifespan.

[0074] In some embodiments, at least one of the first lens L1 and the second lens L2 is made of a combination of plastic and glass, which can reduce cost and weight while ensuring optical accuracy.

[0075] The materials used for the first lens L1 and the second lens L2 can be the same or different, depending on the specific application requirements and manufacturing costs.

[0076] For example, the first lens L1 is a plastic lens, or the first lens L1 is made of both glass and plastic; at least one of the second lenses L2 is a plastic lens, in order to balance optical performance and cost.

[0077] Furthermore, when using a combination of plastic and glass, the lens body can be made of glass to provide good temperature resistance and stability, while the freeform surface can be made of plastic to achieve high-precision manufacturing and facilitate coating.

[0078] Optional plastic materials include polymethyl methacrylate (PMMA), polycarbonate (PC), or cyclic olefin copolymers (COC), which have high transparency, good processability, and are suitable for laser shaping.

[0079] It should be noted that the specific parameters such as the refractive index and Abbe number of the first lens L1 and the second lens L2 can be considered in combination with application needs and manufacturing costs, and this embodiment of the utility model does not impose specific limitations on them.

[0080] The uniform collimating lens module is optional, and the first lens L1 has a blackened side surface.

[0081] Specifically, when the laser beam 20 passes through the first lens L1, some light rays may enter the edge region of the first lens L1 due to refraction, total internal reflection, etc., and undergo multiple reflections on the side, forming stray light. The stray light may interfere with the propagation direction of the main beam of the laser beam 20, affecting the collimation and energy uniformity of the final laser beam 20.

[0082] In this embodiment, the first lens L1, due to its rectangular shape, has four visible sides. A black coating material with high absorptivity and low reflectivity, such as black ink, black paint, light-absorbing resin, or special optical coating, is coated on the four sides of the first lens L1. This coating absorbs stray light reflected or scattered from the sides. By blackening the sides of the first lens L1, the light reflected from the edges of the first lens L1 is effectively absorbed, reducing stray light generation and ensuring the collimation and energy uniformity of the final laser beam 20.

[0083] Optionally, the second lens L2 may also have a blackened side surface to effectively absorb the reflected light from the edge of the second lens L2 by blackening the side surface, thereby reducing the generation of stray light and ensuring the collimation and energy uniformity of the final laser beam 20, but it is not limited to this.

[0084] Optionally, the diameter of the second lens L2 is greater than the length of the first lens L1.

[0085] The length of the first lens L1 refers to the maximum lateral dimension (such as the length of the long side) of the first lens L1 (rectangular lens) perpendicular to the laser propagation direction.

[0086] The diameter of the second lens L2 refers to the outer circumference of the second lens L2 (circular lens).

[0087] In this embodiment, the first lens L1 is rectangular, and its output light spot is usually circular or elliptical. In order to allow the light spot to fully enter the second lens L2 for further shaping, the second lens L2 has a larger diameter to avoid edge truncation and energy loss.

[0088] Optionally, the distance between the laser beam incident surface S1 of the first lens L1 and the laser beam exit surface S4 of the second lens L2 is less than or equal to 30mm. While meeting the high requirements for laser beam collimation and uniformity, it has a small size and high space utilization, which helps to realize the miniaturized design of the uniform collimating lens module.

[0089] Optionally, the thickness of the second lens L2 is greater than the thickness of the first lens L1.

[0090] The thickness of the first lens L1 refers to the axial distance on the optical axis between the laser beam incident surface S1 and the laser beam exit surface S2 of the first lens L1.

[0091] The thickness of the second lens L2 refers to the axial distance on the optical axis between the laser beam incident surface S3 and the laser beam exit surface S4 of the second lens L2.

[0092] In this embodiment, the second lens L2 undertakes the task of finer beam homogenization and collimation. The thicker structure helps to accommodate more complex curved surface designs, thereby improving the collimation and uniformity of the final output laser beam 20.

[0093] In addition, the larger thickness of the second lens L2 helps to reduce optical distortion caused by material deformation or thermal effects, making it suitable for high-power laser applications.

[0094] Optionally, the laser beam 20 emitted by the laser source 10 has an elliptical shape, and the laser beam 20 has a circular shape after being shaped by the homogenizing collimating lens module.

[0095] The laser beam 20 emitted by the laser source 10 has asymmetrical divergence characteristics, manifesting as an elliptical spot. The different divergence angles of the major and minor axes of the spot lead to uneven energy distribution, affecting the imaging quality or processing accuracy in subsequent applications.

[0096] In this embodiment, through the synergistic effect of the first lens L1 and the second lens L2, the elliptical light spot is shaped into a circular light spot, so that the energy is more evenly distributed throughout the entire light spot area. Finally, the maximum and minimum illuminance difference of the shaped laser beam 20 on the target surface 30 can be controlled within 15%, which meets the high requirements for the collimation and uniformity of the laser beam.

[0097] Optionally, the power of the laser source 10 is from 5mW to 200mW.

[0098] The output power of the laser source 10 is set between 5 milliwatts (mW) and 200 milliwatts (mW). This power range can cover the needs of industrial applications from low power consumption to medium and high power, and has good versatility. By designing the homogenizing collimating lens module as an optical system adapted to this power range, the homogenizing collimating lens module can maintain stable beam shaping performance in the range of 5mW to 200mW without the need to replace the lens or recalibrate. This greatly improves the applicability and flexibility of the homogenizing collimating lens module, and is particularly suitable for application scenarios that require switching under different power conditions, such as multi-mode laser equipment, and meets the technical requirements of various application scenarios.

[0099] Optionally, the diameter of the laser beam 20 after being shaped by the homogenizing collimating lens module is 3mm to 10mm.

[0100] In this embodiment of the invention, the original elliptical light spot emitted by the laser source 10 is shaped by the uniform collimating lens module (including the first lens L1 and the second lens L2), and the final output light spot diameter is between 3 mm and 10 mm. It can also achieve a circular flat-top light spot with a maximum and minimum illuminance difference of ≤15%, which can accommodate various light spot size requirements and improve practicality.

[0101] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0102] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A uniform collimating lens module, characterized in that, include: A laser source used to emit laser beams; A first lens and a second lens are placed sequentially in the propagation direction of the laser beam; The laser beam incident surface of the first lens is a plane or a sphere; The laser beam exit surface of the first lens is a freeform surface; The laser beam incident surface of the second lens is a freeform surface; The laser beam exit surface of the second lens is either a plane or a spherical surface; The first lens is a rectangular lens, and the second lens is a circular lens.

2. The uniform collimating lens module according to claim 1, characterized in that, The laser beam exit surface of the first lens is concave; The laser beam incident surface of the second lens is convex.

3. The uniform collimating lens module according to claim 1, characterized in that, The laser beam incident surface of the first lens is a plane; The laser beam exit surface of the second lens is a plane.

4. The uniform collimating lens module according to claim 1, characterized in that, An anti-reflection coating is provided on the laser beam incident surface of the first lens, the laser beam exit surface of the first lens, the laser beam exit surface of the second lens, and the laser beam incident surface of the second lens.

5. The uniform collimating lens module according to claim 1, characterized in that, The first lens is a plastic lens, or the material of the first lens includes plastic and glass; The second lens is a plastic lens, or the material of the second lens includes plastic and glass.

6. The uniform collimating lens module according to claim 1, characterized in that, The first lens has a blackened side surface.

7. The uniform collimating lens module according to claim 1, characterized in that, The diameter of the second lens is greater than the length of the first lens; The distance between the laser beam incident surface of the first lens and the laser beam exit surface of the second lens is less than or equal to 30 mm.

8. The uniform collimating lens module according to claim 1, characterized in that, The laser beam emitted by the laser source has an elliptical spot shape; The laser beam, after being shaped by the homogenizing collimating lens module, has a circular spot shape.

9. The uniform collimating lens module according to claim 1, characterized in that, The power of the laser source is from 5mW to 200mW.

10. The uniform collimating lens module according to claim 1, characterized in that, The diameter of the laser beam after being shaped by the homogenizing collimating lens module is 3mm to 10mm.

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