Coupling method of laser optical path and laser optical path

Abstract

The application discloses a kind of coupling methods of laser optical path and laser optical path, it is related to laser technical field, wherein, the coupling method of laser optical path, its laser optical path includes first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens arranged in order along the direction of light transmission, wherein fourth lens and seventh lens are reflecting lens, for adjusting the transmission direction of light;The coupling method of laser optical path includes the following steps: S1, the product to be coupled is placed on the stage, and the weak light is reversely passed into the light incidence end;In the application scheme, the weak light is reversely passed into the light emission fiber, to couple multiple lens structures, the coupling operation of all optical elements can be integrated into a single process, which greatly simplifies the production process flow, at the same time, only weak light, weak current is needed to complete the operation throughout the process, effectively improve the safety in production process.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and in particular to a coupling method and a laser optical path. Background Technology

[0002] The common optical path of a semiconductor laser contains multiple optical elements, and the precise positioning of these elements is crucial for ensuring the overall performance of the laser. The positioning accuracy of these optical elements directly determines the laser's beam quality, output parameters, and other core performance indicators. Therefore, precise coupling and positioning of the optical elements in the common optical path must be performed according to the actual operating conditions of each laser. If the positioning of the optical elements is deviated, it will directly lead to a significant decrease in the laser's key performance characteristics, causing product parameters to fail to meet factory standards, and in severe cases, even resulting in the laser burning out and being damaged.

[0003] Current industry standard manufacturing processes categorize and separate optical components of the common optical path into multiple independent coupling processes, and complete the coupling and positioning of the optical components by applying a large current. This traditional process has significant drawbacks: First, the process breakdown is cumbersome, and the multi-step debugging and docking verification operation is complex, significantly reducing the overall production efficiency of optical path coupling; second, the coupling process relies on high current operation, which poses a high risk of production conditions and obvious safety hazards, making it difficult to adapt to the needs of efficient, safe, and high-yield large-scale production of lasers. Summary of the Invention

[0004] The main objective of this invention is to propose a laser optical path coupling method and a laser optical path, aiming to improve coupling efficiency and safety during the laser optical path coupling process.

[0005] To achieve the above objectives, the present invention proposes a laser optical path coupling method, wherein the laser optical path includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the light transmission direction, wherein the fourth lens and the seventh lens are reflective lenses used to adjust the light transmission direction; the laser optical path coupling method includes the following steps: S1. Place the product to be coupled on the stage and introduce weak light in the opposite direction at the light incident end; S2. A beam analyzer is set in the optical path to receive the beam transmitted through the optical path and obtain the beam spot parameters. S3. Adjust the position of each lens according to the light spot parameters so that each lens is coupled to a standard position, so as to complete the coupling of the seven lenses in one process; wherein, the standard position is the position of each lens when the light spot parameters displayed on the beam analyzer meet the preset requirements.

[0006] In one embodiment, in S1, the power of the weak light is 300mW to 500mW.

[0007] In one embodiment, in S2, the spot parameters include at least one of spot centroid X, spot centroid Y, and spot edge sharpness.

[0008] In one embodiment, during S2, when the optical path is obstructed by the housing, a periscope is used to guide the light to the beam analyzer.

[0009] In one embodiment, in S3, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are coupled sequentially; wherein, when coupling the first lens, a periscope and the beam analyzer are connected between the first lens and the second lens, the periscope is placed in front of the input end of the beam analyzer, and the light-receiving surface of the beam analyzer faces the first lens.

[0010] In one embodiment, during S3, when coupling the third lens, the beam analyzer is placed between the third lens and the fifth lens; when coupling the fourth lens, the beam analyzer is placed between the fourth lens and the sixth lens; and when coupling the seventh lens, the beam analyzer is placed after the seventh lens.

[0011] In one embodiment, in S3, the second lens is attached to the front of the first lens, and the optical axis center of the second lens and the optical axis center of the first lens are on the same straight line.

[0012] The present invention also proposes a laser optical path, which is coupled using the coupling method of the laser optical path described above. The laser optical path includes a first lens, a second lens, a third lens, a fifth lens, a fourth lens, a sixth lens, and a seventh lens arranged sequentially along the light transmission direction. Among them, the fourth lens and the seventh lens are both reflective lenses. The reflective lenses are used to adjust the light transmission direction so that the light can achieve reverse propagation after passing through the fourth lens and the seventh lens.

[0013] In one embodiment, both the fourth lens and the seventh lens are reflective lenses positioned at 45° to the optical path; the fourth lens is configured to reflect light rays propagating in the horizontal direction so that they propagate in the vertical direction, and the seventh lens is configured to reflect light rays propagating in the vertical direction again and change their propagation direction so that the light rays can achieve a 180° turn after passing through the fourth lens and the seventh lens.

[0014] In one embodiment, the fifth lens is a filter lens, the fifth lens is arranged perpendicular to the base, and the fifth lens forms a set angle with the optical axis, the set angle being the optimal filter angle for the coating of the fifth lens; The sixth lens is positioned perpendicular to the base and is perpendicular to the optical axis.

[0015] This application reverses the flow of weak light through the output optical fiber, and uses a beam analyzer to collect beam parameters in real time. The positions of each optical component are then adjusted synchronously to lock in the optimal installation point. For special optical paths obstructed by the housing, a periscope can be used to complete the light guide adaptation. This changes the traditional multi-process, split coupling production model, integrating the coupling of all optical components into a single process, greatly simplifying the production process and effectively improving the production efficiency of laser optical path coupling. Simultaneously, the entire process requires only weak light and weak current, completely eliminating the traditional high-current coupling method and removing safety hazards during production. Furthermore, relying on the precise beam parameters of the beam analyzer as the adjustment basis eliminates the subjective bias of traditional manual adjustment, significantly improving the positioning accuracy of each optical component and product consistency. This effectively avoids problems such as laser performance degradation, parameter non-compliance, and even device burnout caused by optical path positioning deviations, significantly improving product coupling yield and reducing material loss. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A flowchart illustrating an embodiment of the laser optical path coupling method provided by the present invention; Figure 2 To pass Figure 1 A schematic diagram showing the positions of the lens structures inside a laser coupled by a mid-coupling method; Figure 3 for Figure 2 A schematic diagram of the coupling process of the laser optical path in a laser.

[0018] Explanation of icon numbers: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens; 8. Test light source; 9. Periscope; 91. Beam analyzer; 92. Housing.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] The common optical path of a semiconductor laser contains multiple optical elements, and the precise positioning of these elements is crucial for ensuring the overall performance of the laser. The positioning accuracy of these optical elements directly determines the laser's beam quality, output parameters, and other core performance indicators. Therefore, precise coupling and positioning of the optical elements in the common optical path must be performed according to the actual operating conditions of each laser. If the positioning of the optical elements is deviated, it will directly lead to a significant decrease in the laser's key performance characteristics, causing product parameters to fail to meet factory standards, and in severe cases, even resulting in the laser burning out and being damaged.

[0024] Current industry standard manufacturing processes categorize and separate optical components of the common optical path into multiple independent coupling processes, and complete the coupling and positioning of the optical components by applying a large current. This traditional process has significant drawbacks: First, the process breakdown is cumbersome, and the multi-step debugging and docking verification operation is complex, significantly reducing the overall production efficiency of optical path coupling; second, the coupling process relies on high current operation, which poses a high risk of production conditions and obvious safety hazards, making it difficult to adapt to the needs of efficient, safe, and high-yield large-scale production of lasers.

[0025] This invention proposes a coupling method for the optical path of a laser.

[0026] Please see Figures 1 to 3 In one embodiment of the present invention, the laser optical path coupling method includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7 arranged sequentially along the light transmission direction. The fourth lens 4 and the seventh lens 7 are reflective lenses used to adjust the light transmission direction. The laser optical path coupling method includes the following steps: S1, placing the product to be coupled on a platform and introducing weak light in the opposite direction at the light incident end; S2, setting a beam analyzer 91 in the optical path to receive the light beam transmitted through the optical path and obtain the beam spot parameters; S3, adjusting the position of each lens according to the beam spot parameters so that each lens is coupled to a standard position, thereby completing the coupling of the seven lenses in one process; wherein, the standard position is the position of each lens when the beam spot parameters displayed on the beam analyzer 91 meet preset requirements.

[0027] The laser optical path is the common optical path used for transmitting and controlling the laser beam in a semiconductor laser. The first lens 1 to the seventh lens 7 are all optical elements. The first lens 1 to the third lens 3, the fifth lens 5, and the sixth lens 6 are refractive lenses used for collimating or focusing the beam. The fourth lens 4 and the seventh lens 7 are reflective lenses used to change the transmission direction of the light, achieving spatial reversal of the optical path. The stage is a working platform used to support the laser product to be coupled, enabling stable fixation of the product. The light incident end is the fiber optic output end in the laser. Reverse-direction weak light refers to injecting light into the optical path from the opposite direction of the normal output direction. The beam analyzer 91 is an optical measurement device used to collect and analyze the characteristics of the laser beam, capable of displaying parameters such as the position, shape, and sharpness of the light spot in real time. The light spot parameters are measurable indicators characterizing the beam quality and transmission state, including the position of the light spot centroid and the sharpness of the light spot edges.

[0028] The "reverse input" refers to light being injected from the laser's output end in the opposite direction to the light transmission direction during normal laser operation. The "weak light" refers to a test light source 8 with power far lower than the normal operating power of the laser, typically in the range of several hundred milliwatts. This satisfies measurement requirements while minimizing thermal damage and safety risks to the device from high-power light sources. The "one process" refers to continuously completing the coupling and positioning of all lenses in the same production station and during the same clamping process, without needing to transfer the product to different stations for step-by-step debugging. The "standard position" is the spatial position where each lens achieves optimal optical performance. This position is determined by whether the spot parameters displayed on the beam analyzer 91 meet preset requirements such as the centroid coordinate range and sharpness threshold.

[0029] Traditional laser optical path coupling requires splitting the positioning of seven lenses into multiple independent processes. Each process involves applying a large current to the laser to generate a strong laser beam, and the lens position is determined by observing the output light power. This method suffers from problems such as cumbersome procedures, high-risk high-current operations, and insufficient accuracy due to reliance on human experience. This application's solution introduces a weak light source in the reverse direction from the light incident end. After the light passes through each lens in the optical path, it is received by the beam analyzer 91, which displays the beam parameters in real time. The operator adjusts the position of each lens based on objective parameters such as the centroid position and edge sharpness of the beam displayed on the beam analyzer 91. When the beam parameters meet preset requirements, the lens is confirmed to be coupled to the standard position. The core of this technical solution lies in replacing the high-current forward light output with a weak reverse light source, replacing human experience-based judgment with the precise parameter measurement of the beam analyzer 91, and integrating the lens coupling operations, originally scattered across multiple processes, into a single continuous process. This solution significantly simplifies the production process and greatly improves coupling efficiency. The entire process requires only weak light and weak current, completely eliminating the safety hazards of high-current operation. Relying on the objective and accurate spot parameters provided by the beam analyzer 91 as the basis for adjustment, it eliminates the subjective bias of manual visual judgment, greatly improving the positioning accuracy of each lens and the consistency between different products. It effectively avoids problems such as laser performance attenuation, substandard output parameters, and even device burnout caused by lens positioning deviation, significantly improving coupling yield and reducing material loss.

[0030] In one specific embodiment, the semiconductor laser product to be coupled is fixed on a stage, and a test light source 8 with a power of 400mW is connected in reverse from the light incident end (i.e., the fiber optic output end). The light emitted by the test light source 8 passes sequentially through the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7. When coupling the first lens 1, a beam analyzer 91 is placed between the first lens 1 and the second lens 2. The three-dimensional position of the first lens 1 is adjusted, and the X-coordinate, Y-coordinate, and edge sharpness of the spot displayed on the beam analyzer 91 are observed. When the X-coordinate offset of the spot centroid is less than 0.1mm, the Y-coordinate offset is less than 0.1mm, and the edge sharpness score reaches 90 points or above, it is confirmed that the first lens 1 has been coupled to the standard position and is fixed. Subsequently, the other lenses are coupled sequentially. When coupling each lens, the beam analyzer 91 is placed at the corresponding position, and the position of the lens is adjusted according to the spot parameters displayed by the beam analyzer 91 until the preset requirements are met. Using this method, the coupling and positioning of all seven lenses can be completed in the same workstation and in the same clamping process. The entire coupling cycle is shortened from 2 hours in the traditional process to 30 minutes, and the coupling yield is increased from 85% to over 95%.

[0031] In some embodiments, in S1, the power of the weak light is 300mW~500mW.

[0032] The power of the weak light refers to the output power of the test light source 8, which is fed back into the optical path. This power value is much lower than the output power of a semiconductor laser during normal operation, which is typically in the range of several watts to tens of watts. The power range of 300mW to 500mW means that the actual output power of the test light source 8 can be any value within this range, including endpoints such as 300mW, 400mW, and 500mW, as well as intermediate values ​​such as 350mW and 420mW. The lower limit of this power range, 300mW, is the minimum power requirement to ensure that the beam still has sufficient intensity to be captured and measured by the beam analyzer 91 after passing through multiple lenses. If the power is lower than 300mW, the light intensity may be too weak when it reaches the beam analyzer 91 after long-distance transmission and multiple transmissions from the seventh lens 7 to the first lens 1, resulting in insufficient signal-to-noise ratio of the beam spot parameters and affecting measurement accuracy. The upper limit of 500mW in this power range is the maximum power limit considering safety and device protection. If the power exceeds 500mW, although it is still in the low power range, prolonged exposure may produce a slight thermal effect on some sensitive optical components and increase the requirements for eye safety protection for operators.

[0033] Traditional laser optical path coupling processes require applying a large current to the laser to output several watts or even tens of watts of intense laser light, which is then used to determine the suitability of optical components. This high-power operation poses significant safety hazards. Intense laser light can cause blindness and thermal damage to optical components, and requires complex safety protection measures. This application's solution limits the power of the test light source 8 to a low power range of 300mW to 500mW. On the one hand, this power is sufficient to ensure that the light transmitted through the optical path is effectively captured by the beam analyzer 91, obtaining a clear and stable spot image and accurate spot parameters, meeting the measurement accuracy requirements of lens coupling. On the other hand, this power is far below the normal operating power of the laser, posing no risk of thermal damage to optical components and minimal threat to operator safety. Only conventional protective eyewear is required, eliminating the need for complex safety isolation measures, significantly reducing the safety risks of production operations and making the coupling process safer and more controllable. Simultaneously, the low current required for weak light operation minimizes the impact of large currents on the laser chip, reducing the risk of chip damage during coupling.

[0034] In some embodiments, during S2, the spot parameters include at least one of spot centroid X, spot centroid Y, and spot edge sharpness.

[0035] The centroid X of the light spot refers to the coordinates of the energy center of the light spot in the horizontal direction, usually in millimeters, representing the position of the light spot center on the horizontal axis of the receiving surface of the beam analyzer 91. The centroid Y of the light spot refers to the coordinates of the energy center of the light spot in the vertical direction, also in millimeters, representing the position of the light spot center on the vertical axis of the receiving surface of the beam analyzer 91. The edge sharpness of the light spot refers to the degree of clarity of the light spot boundary, reflecting the focusing and transmission quality of the beam. It is usually quantified by indicators such as intensity gradient and contrast. Higher sharpness indicates better beam quality and higher lens coupling accuracy.

[0036] The term "at least one" refers to selecting one, two, or all three parameters—the centroid X of the light spot, the centroid Y of the light spot, and the edge sharpness of the light spot—to monitor during lens coupling, based on the functional characteristics of different lenses and their positions in the optical path. Specifically, the coupling of some lenses primarily affects the horizontal position of the light spot, in which case the centroid X of the light spot is the primary focus; the coupling of some lenses primarily affects the vertical position of the light spot, in which case the centroid Y of the light spot is the primary focus; and the coupling of some lenses simultaneously affects the position of the light spot in two directions and the focusing quality, in which case the centroid X of the light spot, the centroid Y of the light spot, and the edge sharpness of the light spot must be monitored simultaneously. The statement "at least one" implies that the combination of light spot parameters used for coupling different lenses can be different, but at least one light spot parameter needs to be monitored as an adjustment basis for each lens coupling to ensure coupling accuracy.

[0037] Lenses at different positions in the laser's optical path perform different optical functions. Some lenses are mainly used for collimation, some for focusing, and some for adjusting the beam direction. The influence of lenses with different functions on the beam parameters during coupling varies. For example, the positional shift of a collimating lens located in the horizontal optical path mainly affects the beam centroid X, with a smaller impact on the beam centroid Y; while the angular adjustment of the reflecting lens may affect both the beam centroid X and the beam centroid Y simultaneously. By selectively monitoring one or more parameters among the beam centroid X, the beam centroid Y, and the beam edge sharpness based on the functional characteristics of each lens, the coupling positioning of the lens can be completed more accurately and efficiently. Compared to traditional processes that rely on observing the single comprehensive indicator of laser output power, this application provides a multi-dimensional, decomposable, and refined measurement method, giving the coupling adjustment of each lens a clear quantitative target. Operators can clearly judge the specific impact of the current lens position adjustment on the optical path, thereby quickly and accurately finding the optimal position, significantly improving coupling accuracy and efficiency, and reducing reliance on operator experience.

[0038] In some embodiments, during S2, when the optical path is blocked by the housing 92, a periscope 9 is used to guide the light to the beam analyzer 91.

[0039] The term "hoarding" in the housing 92 refers to a situation in the laser product structure where certain optical path segments are enclosed or blocked by structural components such as metal or non-metal casings or supports, preventing the beam analyzer 91 from being directly placed in the optical path to receive light. The periscope 9 is an optical light guiding device, typically composed of at least two mirrors, capable of guiding light from one position to another, changing the light transmission path, and allowing light that was originally blocked and unable to be directly measured to be guided to the receiving surface of the beam analyzer 91. The light guiding refers to the use of the periscope 9's reflection to guide light from the positions blocked by the housing 92 in the optical path to an open space, enabling the beam analyzer 91 to receive the beam in that segment of the optical path and measure the beam parameters.

[0040] The presence of the housing 92 obstructing the light path refers to the situation where, during the coupling of certain lenses, due to the mechanical structure design of the laser product, the optical path space before and after the lens is occupied by the housing 92 and other structural components, making it impossible to place the beam analyzer 91 directly near the lens to receive light. The use of a periscope 9 for light guiding involves inserting the periscope 9 into the optical path section obstructed by the housing 92. The reflector of the periscope 9 reflects the light from inside the housing 92 and guides it to the open space outside the housing 92. The beam analyzer 91 is then placed at the light-emitting position of the periscope 9, enabling it to receive the beam guided by the periscope 9. The insertion position of the periscope 9 and the reflector angle need to be adjusted according to the specific structure of the housing 92 and the optical path direction to ensure that the light is accurately guided to the beam analyzer 91, and that the deflection of the optical path introduced by the periscope 9 does not affect the measurement accuracy of the beam spot parameters.

[0041] To achieve functions such as heat dissipation, dust prevention, and electromagnetic shielding, semiconductor laser products typically have structural components such as the housing 92 surrounding the optical path, resulting in some optical path sections being in a closed or semi-closed state. Traditional coupling processes rely on the laser's own light output and do not require measurement at the center of the optical path; therefore, the housing 92 does not pose an obstacle. However, the solution in this application requires placing the beam analyzer 91 at different positions in the optical path to measure the spot parameters when coupling different lenses. When a lens position is blocked by the housing 92, the beam analyzer 91 cannot be placed directly, making it impossible to obtain the spot parameters of that lens, thus preventing coupling. By using the periscope 9 for light guiding, the light from the optical path section blocked by the housing 92 is directed to an open space, allowing the beam analyzer 91 to receive measurements. This solves the measurement blind zone problem caused by the housing 92 blocking, ensuring the versatility and integrity of the coupling method. This solution can be adapted to laser products with various structural forms, without being limited by the housing 92 structure, significantly improving the applicability and practical value of the coupling method.

[0042] In some embodiments, in S3, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are coupled sequentially; wherein, when coupling the first lens 1, a periscope 9 and the beam analyzer 91 are connected between the first lens 1 and the second lens 2, the periscope 9 is placed in front of the input end of the beam analyzer 91, and the light-receiving surface of the beam analyzer 91 faces the first lens 1.

[0043] The sequential coupling refers to adjusting and fixing the position of each lens one by one in the order of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7. The coupling of the next lens only occurs after the previous lens has been coupled and fixed. The connection between the first lens 1 and the second lens 2 refers to inserting the periscope 9 and the beam analyzer 91 into the optical path space between the light-emitting side of the first lens 1 and the light-incoming side of the second lens 2, so that the light passes sequentially through the first lens 1, the periscope 9, and the beam analyzer 91. The periscope 9 being placed before the input end of the beam analyzer 91 means that in the light transmission path, the periscope 9 is located upstream of the beam analyzer 91, and the light first passes through the light guide reflection of the periscope 9 before entering the beam analyzer 91. The beam receiver facing the first lens 1 means that the receiving surface of the beam analyzer 91 points towards the location of the first lens 1 to receive the light beam transmitted through the first lens 1 and the periscope 9.

[0044] The sequential coupling order is determined based on the arrangement of lenses in the optical path and the direction of light transmission. Coupling proceeds from the entrance to the exit of the optical path, starting with the first lens 1 and ending with the seventh lens 7. This arrangement ensures that all lenses in front of a new lens are coupled and fixed before coupling, stabilizing the optical path and preventing interference between adjustments made to each lens, thus minimizing redundant adjustments. The periscope 9 and beam analyzer 91 connected between the first lens 1 and the second lens 2 are a dedicated measurement configuration for coupling the first lens 1. Since the first lens 1 is located at the very front of the optical path, and this position is usually obstructed by the housing 92, the periscope 9 is needed to guide the light out. The configuration order in which the periscope 9 is placed before the input end of the beam analyzer 91 refers to the light transmission path being: weak light is reversed and passed through the seventh lens 7 to the second lens 2, then through the first lens 1, reflected and exported by the periscope 9, and then enters the receiving surface of the beam analyzer 91. This configuration ensures that the beam received by the beam analyzer 91 truly reflects the coupling state of the first lens 1.

[0045] The first lens 1, located at the very front of the optical path, is the first optical element that light passes through before entering the laser. Its positional accuracy has a fundamental impact on the performance of the entire optical path. The coupling of the first lens 1 is the starting point for the entire optical path coupling; it must be completed first and with high precision to provide a stable reference for the coupling of subsequent lenses. Since the position of the first lens 1 is usually obscured by the housing 92, the beam analyzer 91 cannot be directly placed for measurement. Therefore, a periscope 9 needs to be connected between the first lens 1 and the second lens 2 to guide the light behind the first lens 1 to the outside of the housing 92, where it is then received by the beam analyzer 91. The periscope 9 is positioned before the input end of the beam analyzer 91 to ensure that the beam analyzer 91 receives the actual beam transmitted through the first lens 1, and that the spot parameters displayed on the beam analyzer 91 accurately reflect the position of the first lens 1. By adjusting the three-dimensional position of the first lens 1, the changes in the centroid X, centroid Y, and edge sharpness of the light spot on the beam analyzer 91 are observed. When these parameters reach the preset standard, it is confirmed that the first lens 1 has been coupled to the standard position and is fixed. This configuration and measurement method not only solves the measurement problem caused by the obstruction of the housing 92, but also ensures the high precision of the coupling of the first lens 1, laying a solid foundation for the coupling of the entire optical path. Subsequently, the second lens 2 to the seventh lens 7 are coupled sequentially. During the coupling of each lens, the corresponding placement method of the beam analyzer 91 and the light spot parameter monitoring strategy are adopted according to its position characteristics and functional characteristics to ensure that each lens can be accurately coupled to the standard position. Finally, the high-precision coupling of all seven lenses is completed in one process.

[0046] In one specific embodiment, the laser product to be coupled is fixed on the stage, and a weak light with a power of 400mW is introduced in reverse from the light incident end. First, the first lens 1 is coupled. A double-mirror periscope 9 and the beam analyzer 91 are connected between the first lens 1 and the second lens 2. The first mirror of the periscope 9 is inserted into the observation hole of the housing 92 and placed 15mm behind the first lens 1. The second mirror is placed 80mm above the housing 92. The beam analyzer 91 is placed 50mm behind the second mirror of the periscope 9, with the light-receiving surface of the beam analyzer 91 facing the first lens 1. The beam analyzer 91 is activated, and the screen displays the image of the light spot transmitted through the first lens 1 and the periscope 9. Adjust the X, Y, and Z positions of the first lens 1, while simultaneously observing the spot centroid X, spot centroid Y, and spot edge sharpness parameters on the beam analyzer 91. Gradually adjust the first lens 1 to a standard position where the spot centroid X is 0.02 mm, the spot centroid Y is -0.03 mm, and the spot edge sharpness score is 92 points. Fix the first lens 1 with UV-curable adhesive. Remove the periscope 9 and the beam analyzer 91, and begin coupling the second lens 2. Couple and fix each lens sequentially according to the order of the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7.

[0047] In some embodiments, during S3, when coupling the third lens 3, the beam analyzer 91 is placed between the third lens 3 and the fifth lens 5; when coupling the fourth lens 4, the beam analyzer 91 is placed between the fourth lens 4 and the sixth lens 6; when coupling the seventh lens 7, the beam analyzer 91 is placed after the seventh lens 7.

[0048] Placing the beam analyzer 91 between the third lens 3 and the fifth lens 5 means that when coupling the third lens 3, the beam analyzer 91 is placed in the optical path space between the light-emitting side of the third lens 3 and the light-incident side of the fifth lens 5, so that the beam analyzer 91 receives the beam transmitted through the third lens 3. Placing the beam analyzer 91 between the fourth lens 4 and the sixth lens 6 means that when coupling the fourth lens 4, the beam analyzer 91 is placed in the optical path space between the light-emitting side of the fourth lens 4 and the light-incident side of the sixth lens 6, so that the beam analyzer 91 receives the beam reflected by the fourth lens 4. Placing the beam analyzer 91 after the seventh lens 7 means that when coupling the seventh lens 7, the beam analyzer 91 is placed on the light-emitting side of the seventh lens 7, so that the beam analyzer 91 receives the beam reflected by the seventh lens 7.

[0049] The reason for placing the fifth lens 5 (as mentioned in the beam analyzer 91) instead of the fourth lens 4 between the third lens 3 and the fifth lens 5 is that, in the actual spatial layout of the optical path, after passing through the third lens 3, the light first reaches the position of the fifth lens 5, then is reflected by the fourth lens 4 to change direction, and then is transmitted through the sixth lens 6 and the seventh lens 7. This layout design allows the light to achieve compact folded transmission within a limited space.

[0050] The third lens 3, the fourth lens 4, and the seventh lens 7 perform different optical functions in the optical path. The third lens 3 is a refractive lens, while the fourth lens 4 and the seventh lens 7 are reflective lenses. When coupling each lens, the beam analyzer 91 needs to be placed in a position that can receive the transmitted beam from that lens to measure the coupling state of that lens. When coupling the third lens 3, the first lens 1 and the second lens 2 are already fixed, while the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are not yet installed or are in a state awaiting coupling. Therefore, a suitable position needs to be found behind the third lens 3 to place the beam analyzer 91. Since the position behind the third lens 3 is adjacent to the fifth lens 5 in the optical path layout, the beam analyzer 91 is placed between the third lens 3 and the fifth lens 5. This position can receive the emitted light from the third lens 3 and has enough space to accommodate the beam analyzer 91, facilitating the measurement of the centroid Y and edge sharpness of the beam of the third lens 3. When coupling the fourth lens 4, the first lens 1 to the third lens 3 are fixed. The fourth lens 4 is a reflecting lens, and its angle (°) adjustment affects the reflection direction of the light beam. Therefore, the beam analyzer 91 needs to be placed in the vertical optical path between the fourth lens 4 and the sixth lens 6. This position can receive the light beam reflected by the fourth lens 4, measure the centroid X and centroid Y of the light spot, and determine whether the reflection angle (°) of the fourth lens 4 is accurate. When coupling the seventh lens 7, the first lens 1 to the sixth lens 6 are all fixed. The seventh lens 7 is the last reflecting lens, ultimately leading out the light beam. The beam analyzer 91 is placed directly after the seventh lens 7, receiving the final light beam transmitted through the entire optical path, measuring the centroid X and centroid Y of the light spot, determining whether the reflection angle (°) of the seventh lens 7 is accurate, and whether the overall transmission effect of the entire optical path meets the standard. By using different placement positions of the beam analyzer 91 for different lenses, the coupling measurement of each lens can obtain the most direct and accurate light spot parameters, significantly improving coupling accuracy and efficiency.

[0051] In one specific embodiment, after the coupling and fixing of the first lens 1 and the second lens 2 are completed, the coupling of the third lens 3 begins. The beam analyzer 91 is placed in the horizontal optical path segment between the third lens 3 and the fifth lens 5, approximately 40 mm from the third lens 3, with the light-receiving surface of the beam analyzer 91 facing the third lens 3. The position of the third lens 3 is adjusted, and the centroid Y of the light spot and the edge sharpness of the light spot are observed on the beam analyzer 91. When the centroid Y of the light spot reaches 0 ± 0.15 mm and the edge sharpness score of the light spot is ≥ 85 points, the third lens 3 is fixed. The beam analyzer 91 is removed, and the fifth lens 5 and the sixth lens 6 are installed to the specified limit positions and fixed (the fifth lens 5 and the sixth lens 6 are pasted according to the specified limit positions and do not need to be adjusted by the beam analyzer 91). Begin coupling the fourth lens 4. Place the beam analyzer 91 in the vertical optical path between the fourth lens 4 and the sixth lens 6, approximately 60 mm from the fourth lens 4, with the receiving surface of the beam analyzer 91 facing upwards to receive the upward-reflected beam from the fourth lens 4. Adjust the angle and position of the fourth lens 4, and observe the centroids X and Y of the light spot on the beam analyzer 91. When the centroids X and Y reach 0 ± 0.1 mm, fix the fourth lens 4. Remove the beam analyzer 91 and begin coupling the seventh lens 7. Place the beam analyzer 91 in the horizontal optical path after the seventh lens 7, approximately 50 mm from the seventh lens 7, with the receiving surface of the beam analyzer 91 facing the seventh lens 7. Adjust the angle and position of the seventh lens 7, and observe the centroid X and centroid Y of the light spot on the beam analyzer 91. When the centroid X reaches 0±0.1mm and the centroid Y reaches 0±0.1mm, fix the seventh lens 7 to complete the coupling of all lenses.

[0052] In some embodiments, in S3, the second lens 2 is attached to the front of the first lens 1, and the optical axis center of the second lens 2 is on the same straight line as the optical axis center of the first lens 1.

[0053] The phrase "the second lens 2 is attached to the first lens 1" means that the second lens 2 is installed flush against the light-incident side of the first lens 1, with no gap or a very small gap between them, typically less than 1 mm. "Before" means that in the direction of light transmission, the second lens 2 is located upstream of the first lens 1, and the light passes through the second lens 2 first before entering the first lens 1. The optical axis center refers to the intersection of the lens's optical axis of symmetry and the lens surface; this point is both the geometric and optical center of the lens. The phrase "the optical axis center of the second lens 2 and the optical axis center of the first lens 1 are on the same straight line" means that the optical axis centers of the two lenses are aligned in space and lie on the same straight line. This straight line is the ideal transmission axis of the light path, ensuring that the light can pass through the two lenses along the optimal path.

[0054] The term "attached" refers to a tight-fitting installation method between the second lens 2 and the first lens 1. The two lenses are bonded together using optical adhesive or a precision alignment mechanism, with the gap controlled within 50 μm to ensure stable relative positions. The installation method prior to attaching the second lens 2 to the first lens 1 involves directly attaching the second lens 2 to the light-incident surface of the first lens 1 after coupling, positioning, and fixing the first lens 1, without needing to adjust its position again using the beam analyzer 91. The alignment requirement of having the optical axis centers on the same straight line means that the X-coordinate deviation between the optical axis center of the second lens 2 and the first lens 1 is ≤0.1 mm, and the Y-coordinate deviation is ≤0.1 mm. This ensures the optical centers of the two lenses are aligned, allowing light to pass through them along the optimal path and minimizing beam distortion or energy loss caused by optical axis misalignment.

[0055] The first lens 1 and the second lens 2 are positioned adjacently in the optical path, jointly undertaking the function of beam collimation or pre-focusing at the entrance section of the optical path. In traditional coupling processes, the first lens 1 and the second lens 2 need to be adjusted and fixed independently, which is cumbersome and makes it difficult to ensure high-precision alignment of the two lenses. The solution in this application adopts a method of first coupling the first lens 1 to a standard position and fixing it, and then directly attaching the second lens 2 in front of the first lens 1, ensuring that the optical axis centers of the two lenses are aligned. The technical rationale for this method is as follows: on the one hand, the first lens 1 is precisely adjusted to a standard position by the beam analyzer 91, and its optical performance is optimal, with the position of the first lens 1 providing a reference for the entire optical path; on the other hand, the second lens 2 is attached in front of the first lens 1, and the optical axis centers of the two are aligned, ensuring that the light passes through the two lenses along the optimal path, and the second lens 2 does not need to be adjusted independently again, simplifying the coupling steps. This attachment method makes the first lens 1 and the second lens 2 form an optical whole, with their relative positions fixed and highly aligned, avoiding the relative position deviation caused by the separate adjustment of the two lenses in traditional processes, thus improving beam transmission quality and product consistency. Meanwhile, by eliminating the independent coupling adjustment step of the second lens 2, the overall coupling time is further shortened, and production efficiency is improved.

[0056] For the specific coupling process of the aforementioned lenses, please refer to... Figure 1 , Figure 2 and Figure 3 To understand the coupling process, it should be noted that the arrows in the diagram represent multiple coupling processes performed step by step from top to bottom, and do not represent the actual positions of the periscope 9 and the beam analyzer 91 during the coupling process; they are only diagrams of their relative positions.

[0057] This application also includes a laser optical path, wherein the laser optical path is coupled using a laser optical path coupling method, wherein the laser optical path coupling method is as described in the relevant content of the above embodiments, and the laser optical path includes a first lens 1, a second lens 2, a third lens 3, a fifth lens 5, a fourth lens 4, a sixth lens 6, and a seventh lens 7 arranged sequentially along the light transmission direction; wherein the fourth lens 4 and the seventh lens 7 are both reflective lenses, and the reflective lenses are used to adjust the light transmission direction so that the light can achieve reverse propagation after passing through the fourth lens 4 and the seventh lens 7.

[0058] The laser optical path is an optical system used for transmitting and controlling the laser beam in a semiconductor laser, composed of multiple optical elements arranged in specific spatial positions and angles. The sequential arrangement along the light transmission direction means that the lenses are arranged according to the actual path of light transmission. The light originates from the entrance end of the optical path and passes sequentially through the first lens 1, the second lens 2, the third lens 3, the fifth lens 5, the fourth lens 4, the sixth lens 6, and the seventh lens 7. The reflecting lens is an optical element with a high-reflectivity coating on its surface, capable of reflecting incident light at a specific angle, changing the light transmission direction, unlike the principle of a refracting lens which changes the light direction through refraction. Adjusting the light transmission direction means that the light transmission path is reversed through the reflection of the reflecting lens, achieving spatial folding or direction change of the optical path. The reverse propagation of the light means that after the light is reflected twice by the fourth lens 4 and the seventh lens 7, the transmission direction changes 180° relative to the initial direction, completely reversing the light transmission direction.

[0059] The lens sequence mentioned in the sequential arrangement along the light transmission direction is the first lens 1, the second lens 2, the third lens 3, the fifth lens 5, the fourth lens 4, the sixth lens 6, and the seventh lens 7, which differs from the lens numbering sequence (first lens 1 to seventh lens 7) mentioned in claim 1. This difference is because the lens numbering sequence is usually based on the spatial layout of the installation position, while the order of the light transmission direction is based on the actual order in which the light passes through the lenses. In the optical path structure of this application, after the light passes through the first lens 1, the second lens 2, and the third lens 3 in sequence, it first reaches the fifth lens 5, then is reflected by the fourth lens 4 to change its direction, then passes through the sixth lens 6, and finally is reflected out by the seventh lens 7. The fourth lens 4 and the seventh lens 7 are both reflecting lenses, meaning that the working principle of these two lenses is reflection rather than refraction. They are usually placed at a 45° angle, and the incident light shines on the reflecting surface at a near-vertical angle of 90°. After reflection, the direction of the light changes by about 90°. The ability of light to propagate in the reverse direction after passing through the fourth lens 4 and the seventh lens 7 means that the light is reflected by the fourth lens 4 for the first time, changing its direction by 90° from horizontal to vertical; and then reflected by the seventh lens 7 for the second time, changing its direction by 90° again from vertical to horizontal, with the horizontal direction being opposite to the initial horizontal direction, thus achieving a 180° turn, i.e., reverse propagation.

[0060] Semiconductor laser optical paths need to achieve multiple optical functions such as beam collimation, focusing, and filtering within a limited space, often requiring a relatively long optical path. A linear optical path layout would result in an excessively large device, hindering compact design. By incorporating two reflecting lenses, the fourth lens 4 and the seventh lens 7, within the optical path, the light transmission direction is redirected twice by 90°, achieving a U-shaped fold. After passing through the horizontal segment from the first lens 1 to the third lens 3, the light is reflected by the fourth lens 4 and becomes vertically upward. After passing through the vertical segment of the fifth lens 5 and the sixth lens 6, it is reflected again by the seventh lens 7 and becomes horizontally reversed, completing a 180° turn. This folded optical path design makes the entire optical system more compact, significantly reducing the device's planar footprint while ensuring a sufficient optical path length, thus facilitating miniaturization and integration of laser products. Meanwhile, the reflective lens boasts a reflectivity exceeding 99%, resulting in minimal light energy loss. Furthermore, unlike refracting lenses, the reflective surface does not introduce dispersion or aberrations, thus contributing to maintaining beam quality. The fifth lens 5, located in the vertical optical path, performs a filtering function, removing unwanted wavelength components through a specific coating. The sixth lens 6, also located in the vertical optical path, provides further focusing or collimation. The overall optical path structure is rationally designed, meeting optical performance requirements while achieving a compact layout.

[0061] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, both the fourth lens 4 and the seventh lens 7 are reflective lenses set at 45° to the optical path; the fourth lens 4 is configured to reflect light rays transmitted in the horizontal direction to be transmitted in the vertical direction, and the seventh lens 7 is configured to reflect light rays transmitted in the vertical direction again and change their transmission direction, so that the light rays can achieve a 180° turn after passing through the fourth lens 4 and the seventh lens 7.

[0062] The 45° angle setting with the optical path refers to the angle between the reflecting surface of the reflective lens and the incident direction of the light being 45°. This angle setting causes the incident light to change direction by 90° after reflection. Horizontal transmission means the light travels parallel to the plane of the device base, with the light transmission path lying in the horizontal plane. Vertical transmission means the light travels perpendicular to the plane of the device base, with the light transmission path lying in the vertical plane. "Configured" refers to achieving specific optical functions by setting the mounting angle and spatial position of the reflective lens. "Reflecting again and changing its transmission direction" means that after the seventh lens 7 reflects the vertically transmitted light, the light direction changes again by 90°, from vertical to horizontal. "180° reversal" means that after two 90° reflections, the final transmission direction differs from the initial transmission direction by 180°, and the light travels in the opposite direction.

[0063] The "optical path" mentioned in the 45° angle setting refers to the transmission path of the incident light. The 45° angle refers to the angle between the normal of the reflecting surface of the reflecting lens and the direction of the incident light, or in other words, the angle between the reflecting surface and the direction of the incident light is 45°. This angle setting is based on the optical law of reflection; when the incident angle is 45°, the reflection angle is also 45°, and the angle between the incident and reflected light is 90°, achieving a right-angle reversal in the light transmission direction. The fourth lens 4 is configured to reflect light transmitted horizontally into light transmitted vertically. Specifically, the reflecting surface of the fourth lens 4 forms a 45° angle with the horizontal plane, and the normal of the reflecting surface forms a 45° angle with the horizontal plane. When horizontally transmitted light strikes the reflecting surface of the fourth lens 4 at a 45° incident angle, the light is reflected upwards at a 45° angle, and the direction of the reflected light becomes vertically upward, achieving a horizontal-to-vertical reversal. The seventh lens 7 is configured to reflect vertically transmitted light again and change its transmission direction. Specifically, the reflecting surface of the seventh lens 7 forms a 45° angle with the vertical plane. When vertically upward transmitted light shines on the reflecting surface of the seventh lens 7 at a 45° incident angle, the light is reflected laterally at a 45° angle, and the reflected light direction becomes horizontal, achieving a vertical-to-horizontal reversal. The 180° reversal means that the light initially travels horizontally in direction A, is reflected by the fourth lens 4 and then travels vertically, and then is reflected again by the seventh lens 7 and travels horizontally in direction B. Horizontal direction B is opposite to horizontal direction A, and the light transmission directions differ by 180°.

[0064] The reflection angle ° of the reflecting lens depends on the angle between the reflecting surface and the incident light. In the optical path design, to achieve a right-angle turn of the light, the reflecting surface of the reflecting lens needs to be set at a 45° angle to the incident light. According to the law of reflection, the angle between the reflected light and the incident light is 90°, achieving a right-angle turn. In the optical path described in this application, both the fourth lens 4 and the seventh lens 7 are set at a 45° angle. The fourth lens 4 reflects the initially horizontally transmitted light upward by 90°, turning it into a vertically upward transmission. The light passes through the fifth lens 5 and the sixth lens 6 in the vertical segment, completing the filtering and further focusing functions. The seventh lens 7 reflects the vertically upward transmitted light to the side by 90°, turning it into a horizontal transmission. Due to the directional configuration of the two reflections, the final horizontal transmission direction is opposite to the initial horizontal transmission direction, and the light completes a 180° turn, realizing a U-shaped folded optical path. This 45° angle double-reflector design is a classic structure for realizing a folded optical path. The two 90° turns make the light transmission path U-shaped, the optical path length ° remains unchanged, but the device's planar size is greatly reduced. Meanwhile, the 45° angle reflection maintains the symmetry and roundness of the beam, preventing the introduction of aberrations such as astigmatism, which helps maintain beam quality. The reflecting surfaces of the fourth lens 4 and the seventh lens 7 are coated with a high-reflectivity dielectric film, with a reflectivity ≥99%, resulting in minimal light energy loss and a negligible impact on beam quality. Through this double-mirror structure, the laser optical path achieves a long optical path and multiple optical functions within a limited space, resulting in a compact product structure and excellent performance.

[0065] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the fifth lens 5 is a filter lens, the fifth lens 5 is set perpendicular to the base, and the fifth lens 5 forms a set angle with the optical axis, the set angle being the optimal filter angle for the coating of the fifth lens 5; the sixth lens 6 is set perpendicular to the base, and the sixth lens 6 is perpendicular to the optical axis.

[0066] The filter lens is an optical element with a specific wavelength-selective film coated on its surface. It can transmit light within a specific wavelength range while blocking or reflecting light of other wavelengths, thus achieving spectral filtering. "Perpendicular to the base" means that the mounting surface of the lens is perpendicular to the base plane of the laser, and the lens is installed vertically. The optical axis is the ideal central path for light transmission, representing the direction of beam propagation. "Forming a set angle with the optical axis" means that there is a certain angle (°) between the normal direction of the lens and the optical axis direction; the lens surface is not perpendicular to the optical axis but has an angle (°) relative to the vertical position. The optimal filtering angle is the angle between the incident light and the lens normal when the filter film achieves optimal filtering performance (such as highest transmittance, narrowest bandwidth, and steepest cutoff edge). This angle (°) is determined by the coating process and film design. "The sixth lens 6 is perpendicular to the optical axis" means that the normal direction of the sixth lens 6 is parallel to the optical axis direction, and light is incident perpendicularly on the surface of the sixth lens 6.

[0067] The fifth lens 5 being perpendicular to the base means that the fifth lens 5 is installed vertically, with its surface parallel to the vertical plane. This is because the fifth lens 5 is located in the vertical optical path segment, and light travels vertically; its vertical placement facilitates light transmission. The fifth lens 5 forming a set angle with the optical axis means that although it is installed vertically, it is not directly perpendicular to the optical axis, but rather has a tilt angle of °, causing light to enter the surface of the fifth lens 5 at a non-perpendicular angle °. This tilt angle ° is the set angle, typically within the range of 5° to 15°, with the specific value depending on the design wavelength, film structure, and material properties of the coating on the surface of the fifth lens 5. The optimal filter angle refers to the angle at which the optical performance of the filter film reaches its design optimum, such as the highest transmittance (over 95%) for the target wavelength of 976nm, the strongest suppression capability for other wavelengths (transmittance less than 1%), and the narrowest filter bandwidth (e.g., ±2nm). If the incident angle deviates from the optimal filtering angle of the coating, the filtering performance will decrease, the transmittance will decrease, the bandwidth will widen, and the filtering effect will deteriorate. The sixth lens 6 is positioned perpendicular to the base and perpendicular to the optical axis, meaning that the sixth lens 6 is installed vertically with its surface facing the optical axis, allowing light to be incident perpendicularly without any tilt angle. This installation method ensures that the focusing or collimating function of the sixth lens 6 reaches its optimal state, minimizing astigmatism or beam distortion caused by tilt.

[0068] The fifth lens 5 performs a filtering function in the optical path. Through a narrow-band filter film coated on its surface, it allows only light of the target wavelength (e.g., 976nm) to pass through, filtering out stray light and background light of other wavelengths, thus improving the spectral purity of the laser output beam. The performance of the filter film is closely related to the incident angle of the light. When the light is incident at the optimal filtering angle of the coating, the optical interference effect inside the film reaches its optimal state, resulting in the best filtering performance. Therefore, the fifth lens 5 needs to be set to form a predetermined angle with the optical axis according to its coating characteristics, so that the light is incident at the optimal angle, fully utilizing the performance advantages of the filter film. Simultaneously, the fifth lens 5 is set perpendicular to the base, ensuring stable installation in the vertical optical path section, resulting in a simple and reliable structure. The sixth lens 6 performs a focusing or collimating function in the optical path, requiring precise wavefront control of the beam. Therefore, it requires the light to be incident perpendicularly, minimizing any aberrations introduced by tilt. The sixth lens 6 is positioned perpendicular to the base and the optical axis, ensuring that light passes through under optimal incident conditions. This allows the optical performance of the sixth lens 6 to be fully utilized, guaranteeing beam quality. By employing installation methods with tilt angles and perpendicular incident angles, tailored to the different functional characteristics of the fifth lens 5 and the sixth lens 6, the optical functions of each lens in the optical path are optimized, resulting in excellent performance of the entire optical system.

[0069] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A coupling method for a laser optical path, the laser optical path comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the light transmission direction, wherein the fourth lens and the seventh lens are reflective lenses used to adjust the light transmission direction; characterized in that, The coupling method for the laser optical path includes the following steps: S1. Place the product to be coupled on the stage and introduce weak light in the opposite direction at the light incident end; S2. A beam analyzer is set in the optical path to receive the beam transmitted through the optical path and obtain the beam spot parameters. S3. Adjust the position of each lens according to the light spot parameters so that each lens is coupled to a standard position, so as to complete the coupling of the seven lenses in one process; wherein, the standard position is the position of each lens when the light spot parameters displayed on the beam analyzer meet the preset requirements.

2. The coupling method for the laser optical path according to claim 1, characterized in that, In S1, the power of the weak light is 300mW~500mW.

3. The coupling method for the laser optical path according to claim 1, characterized in that, In S2, the spot parameters include at least one of the spot centroid X, spot centroid Y, and spot edge sharpness.

4. The coupling method for the laser optical path according to claim 1, characterized in that, In step S2, when the optical path is obstructed by the housing, a periscope is used to guide the light to the beam analyzer.

5. The coupling method for the laser optical path according to claim 1, characterized in that, In S3, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are coupled sequentially; wherein, when coupling the first lens, a periscope and the beam analyzer are connected between the first lens and the second lens, the periscope is placed in front of the input end of the beam analyzer, and the light-receiving surface of the beam analyzer faces the first lens.

6. The coupling method for the laser optical path according to claim 1, characterized in that, In S3, when coupling the third lens, the beam analyzer is placed between the third lens and the fifth lens; when coupling the fourth lens, the beam analyzer is placed between the fourth lens and the sixth lens; when coupling the seventh lens, the beam analyzer is placed after the seventh lens.

7. The coupling method for the laser optical path according to claim 1, characterized in that, In step S3, the second lens is attached in front of the first lens, and the optical axis center of the second lens is on the same straight line as the optical axis center of the first lens.

8. A laser optical path, coupled using the coupling method for the laser optical path as described in any one of claims 1-7, characterized in that, The laser optical path includes a first lens, a second lens, a third lens, a fifth lens, a fourth lens, a sixth lens, and a seventh lens arranged sequentially along the light transmission direction; wherein the fourth lens and the seventh lens are both reflective lenses, and the reflective lenses are used to adjust the light transmission direction so that the light can achieve reverse propagation after passing through the fourth lens and the seventh lens.

9. The laser optical path according to claim 8, characterized in that, Both the fourth lens and the seventh lens are reflective lenses positioned at 45° to the optical path. The fourth lens is configured to reflect light rays propagating in the horizontal direction into light rays propagating in the vertical direction, and the seventh lens is configured to reflect light rays propagating in the vertical direction again and change their propagation direction, so that the light rays can achieve a 180° turn after passing through the fourth lens and the seventh lens.

10. The laser optical path according to claim 8, characterized in that, The fifth lens is a filter lens. The fifth lens is set perpendicular to the base and forms a set angle with the optical axis. The set angle is the optimal filter angle for the coating of the fifth lens. The sixth lens is positioned perpendicular to the base and is perpendicular to the optical axis.

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