Laser divergence angle measuring device

Abstract

The utility model provides a kind of laser divergence angle measuring device, it includes: the laser output head and power meter of opposite arrangement;Closed assembly, it includes with the first component of the laser output head fixed connection and with the second component of the power meter fixed connection, the second component is slidably sleeved in the first component to make the closed assembly close the laser light path between the laser output head and the power meter, and the second component has diaphragm;Position adjustment assembly, it is configured as being suitable for adjusting the relative position between the first component and the second component of the closed assembly;And control unit, it is electrically connected with the laser output head, the power meter and the position adjustment assembly.According to some embodiments of the utility model, laser divergence angle can be efficiently and accurately automatically measured, and scattering laser is avoided from leaking from the device, has strong applicability, and has cooling capacity.

Description

Technical Field

[0001] This utility model relates to the field of laser technology, and in particular to a laser divergence angle measuring device. Background Technology

[0002] In laser technology applications, the divergence angle of the output laser from a fiber optic or fiber laser is a crucial parameter. The divergence angle is used to match components and structures within an optical system, thus necessitating frequent measurement. However, current laser divergence angle measurement devices often require manual operation, which is complex and inaccurate. While some automatic or semi-automatic devices exist, these are generally complex in structure, require cumbersome operation, and are expensive. Furthermore, some have shortcomings in accuracy, safety, and cooling performance. Utility Model Content

[0003] The purpose of this invention is to provide a laser divergence angle measuring device to at least partially solve the problems existing in the prior art.

[0004] According to an aspect of this utility model, a laser divergence angle measuring device is provided, the laser divergence angle measuring device comprising:

[0005] Opposite laser output head and power meter;

[0006] A sealing assembly includes a first component fixedly connected to the laser output head and a second component fixedly connected to the power meter. The first component is slidably sleeved on the second component so that the sealing assembly seals the laser optical path between the laser output head and the power meter, and the second component has an aperture.

[0007] A position adjustment component configured to adjust the relative position between the first and second components of the enclosing component; and

[0008] The control unit is electrically connected to the laser output head, the power meter, and the position adjustment assembly.

[0009] According to the laser processing apparatus of the first aspect of this invention, the laser optical path between the laser output head and the power meter can be sealed by means of a sealing component, preventing laser leakage and thus avoiding adverse effects of scattered laser on the external environment. Furthermore, the relative position between the first and second components of the sealing component can be adjusted by a position adjustment component, thereby adjusting the distance between the laser output head and the aperture. This allows the laser divergence angle measuring device of this invention to measure the laser divergence angle more accurately and effectively, and it is suitable for measuring the divergence angle of different output lasers.

[0010] According to an optional embodiment of this utility model, the control unit is configured to control the position adjustment component based on a predetermined power ratio to determine the distance between the laser output head and the aperture of the second component, and to determine the laser divergence angle based on the distance and the size parameter of the aperture's light transmission hole. The predetermined power ratio is a preset ratio between the laser power received by the power meter and the laser power output by the laser output head. With this embodiment, the control unit determines the distance between the laser output head and the aperture based on the predetermined power ratio, and then calculates the laser divergence angle based on this distance and the size parameter of the aperture's light transmission hole. This allows the aperture to block weak light or noise from the outermost edge of the laser beam, thus eliminating stray light or noise at the laser beam edge, while retaining the core portion of the laser beam for measurement. This makes the measurement closer to the theoretical value, and the operation and calculation process are simple and convenient.

[0011] According to an optional embodiment of the present invention, the predetermined power ratio is 86.5%. In many laser applications, what truly matters is the core region where the laser beam's power accounts for 86.5%, and this embodiment allows for accurate measurement of the laser divergence angle in this core region.

[0012] According to an optional embodiment of the present invention, the second component is formed as a cylindrical aperture cover, with the end near the laser output head forming the aperture. The light-passing hole of the aperture is aligned with the light-emitting point of the laser output head, and the end near the power meter opens towards the light-receiving surface of the power meter and is fixedly connected to the power meter. This embodiment allows for the closure of the laser optical path between the aperture and the power meter using a simple second component, and enables the aperture and the power meter to be fixedly connected to each other.

[0013] According to an optional embodiment of the present invention, the first component is formed as a cylindrical water-cooling shell having a hollow water-cooling channel and an inlet and an outlet communicating with the water-cooling channel. Through this embodiment, by means of the first component, not only can the laser path between the laser output head and the second component be sealed off, but the area of ​​the laser path can also be cooled, preventing the device from overheating and causing various problems.

[0014] According to an optional embodiment of the present invention, the laser output head is mounted in a mounting hole on the end wall of the first component away from the power meter, and the water-cooling channel includes at least one or more water-cooling channels passing through the end wall. This embodiment ensures cooling of the area between the first and second components on the side of the end wall of the first component where the laser output head is mounted, thus enhancing the cooling effect.

[0015] According to an optional embodiment of this invention, both the inlet and the outlet are located at or near the end of the first component furthest from the laser output head. This embodiment helps to maximize the area of ​​the cooling channels within the first component through proper design, allowing the coolant to flow over a larger area of ​​the first component and enhancing the cooling effect.

[0016] According to an optional embodiment of the present invention, within the first component, the inner wall of the first component and the outer wall of the second component are spaced apart to form a closed cavity. This embodiment allows for a more uniform heat distribution between the first and second components and greater exposure of the heat to the water-cooling channels, thereby enhancing the cooling effect.

[0017] According to an optional embodiment of the present invention, the laser divergence angle measuring device further includes a fixed support, and the position adjustment component and the power meter are fixedly installed on the fixed support.

[0018] According to an optional embodiment of the present invention, the position adjustment assembly includes a slide rail, a slider, and a drive source. The slider is fixedly connected to the first component, and the slide rail and the drive source are fixed to the fixed support. This embodiment allows for easy adjustment of the distance between the first and second components using a simple structure.

[0019] According to an optional embodiment of the present invention, the driving source is a motor.

[0020] According to an optional embodiment of the present invention, the slide rail is or includes a lead screw, the slider is mounted on the lead screw through a threaded hole that mates with the lead screw thread, and the drive source drives the lead screw to rotate, thereby moving the slider along the lead screw. This embodiment provides a simple and easy-to-operate position adjustment component. Attached Figure Description

[0021] The present invention will now be described in more detail with reference to the accompanying drawings, which will provide a better understanding of its principles, features, and advantages. The drawings include:

[0022] Figure 1 A laser divergence angle measuring device according to an exemplary embodiment of the present invention is schematically shown.

[0023] Figure 2 The diagram schematically illustrates a working state of a laser divergence angle measuring device according to an exemplary embodiment of the present invention.

[0024] Figure 3 The diagram illustrates the principle of laser divergence angle measurement according to an exemplary embodiment of the present invention.

[0025] Reference tag list

[0026] 100° laser divergence angle measuring device

[0027] 1. Laser output head

[0028] 2 Power Meter

[0029] 3. Enclosed components

[0030] 31 First Component

[0031] 32 Second Component

[0032] 320mm aperture

[0033] 4 Position Adjustment Components

[0034] 41 Slide rail

[0035] 42 sliders

[0036] 43 Driver Source

[0037] 5 Control Unit

[0038] 6 Fixed support Detailed Implementation

[0039] To make the technical problem to be solved, the technical solution, and the beneficial technical effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the scope of protection of the present utility model.

[0040] Figure 1 A laser divergence angle measuring device 100 according to an exemplary embodiment of the present invention is schematically shown. Figure 2 The diagram schematically illustrates a working state of a laser divergence angle measuring device 100 according to an exemplary embodiment of the present invention. Figure 3 The diagram illustrates the principle of laser divergence angle measurement of a laser divergence angle measuring device 100 according to an exemplary embodiment of the present invention.

[0041] like Figure 1 As shown, a laser divergence angle measuring device 100 according to an exemplary embodiment of the present invention includes a laser output head 1, a power meter 2, a sealing component 3, a position adjustment component 4, and a control unit 5, and preferably also includes a fixed support 6.

[0042] The laser output head 1 and the power meter 2 are positioned opposite each other, so that the laser beam output from the laser output head 1 can be incident perpendicularly on the receiving surface of the power meter 2, enabling the power meter 2 to accurately measure the power of the received laser beam.

[0043] A sealing assembly 3 is disposed between the laser output head 1 and the power meter 2. The sealing assembly 3 includes a first component 31 fixedly connected to the laser output head 1 and a second component 32 fixedly connected to the power meter 2. The first component 31 is slidably sleeved on the second component 32, thereby sealing the laser optical path between the laser output head 1 and the power meter 2. In addition, the second component 32 has an aperture, and at least a portion, particularly the core portion, of the laser beam output from the laser output head 1 is incident on the receiving surface of the power meter 2 through the light-passing hole 320 of the aperture.

[0044] The position adjustment component 4 is configured to adjust the relative position between the first component 31 and the second component 32 of the enclosure component 3, thereby adjusting the distance between the laser output head 1 fixedly connected to the first component 31 and the aperture of the second component 32. Since the laser beam output by the laser output head 1 has a divergence angle and is conical, this can further adjust the amount of light / power of the outermost ring of the laser beam intercepted by the aperture, that is, adjust the amount of laser beam that can pass through the light-transmitting hole 320 of the aperture and reach the receiving surface of the power meter 2.

[0045] The control unit 5 is electrically connected to the laser output head 1, the power meter 2, and the position adjustment assembly 4, thereby performing various controls on them or exchanging various information with them.

[0046] In a preferred embodiment, the position adjustment component 4 and the power meter 2 are fixedly mounted on the fixed support 6.

[0047] In a preferred embodiment, the control unit 5 is configured to control the position adjustment component 4 based on a predetermined power ratio to determine the distance between the laser output head 1 and the aperture of the second component 32, and to determine the laser divergence angle based on the distance and the size parameters of the aperture 320 of the aperture, wherein the predetermined power ratio is a preset ratio between the laser power received by the power meter 2 and the laser power output by the laser output head 1.

[0048] In a preferred embodiment, the predetermined power ratio is 86.5%.

[0049] In applications such as fiber coupling and laser processing, the core energy region of the laser beam is what truly matters; for example, 86.5% of the energy is contained within 1 / e 2 Within the radius, the edge light of the laser beam may be ignored due to its low energy or lack of contribution. Therefore, an effective measurement of the laser divergence angle is actually measuring the divergence angle of this 86.5% core beam. Therefore, as... Figure 1 and Figure 2As shown, and refer to Figure 3 The schematic diagram shows that the distance d between the light-emitting point P of the laser output head 1 and the aperture of the second component 32 can be changed by adjusting the relative position between the first component 31 and the second component 32 of the enclosed assembly 3. This changes the proportion of laser light blocked by the aperture of the second component 32, and also changes the proportion of power received by the power meter 2. Therefore, this distance d can be determined by the predetermined power ratio.

[0050] Specifically, while controlling the position adjustment component 4 to adjust the relative position, the control unit 5 acquires the laser power data measured by the power meter 2. When the ratio of the laser power received by the power meter 2 to the laser power output by the laser output head 1 is equal to the predetermined power ratio, for example, 86.5%, the control unit 5 controls the operation of the position adjustment component 4 to stop and acquires the distance between the light-emitting point P of the laser output head 1 and the aperture of the second component 32 at this time. Then, based on this distance d and the known radius r of the light-transmitting aperture 320 of the aperture, the laser divergence angle is calculated. Note that here we assume that the light output point P of laser output head 1 is equivalent to a point light source, therefore we can obtain:

[0051]

[0052] Those skilled in the art will understand that when the laser output head 1 outputs laser light with a light-emitting surface having a radius instead of a light-emitting point, the r in the above formula can be replaced by the difference between the radius of the light-transmitting aperture 320 and the radius of the light-emitting surface.

[0053] In a preferred embodiment, the second component 32 is formed as a cylindrical aperture cover, with its end near the laser output head 1, particularly its end wall, forming an aperture. The light-passing aperture 320 of this aperture is aligned with the light-emitting point P of the laser output head 1, ensuring that at least when the light-emitting point P of the laser output head 1 is in its closest position to the aperture, the laser beam from the light-emitting point P can completely pass through the light-passing aperture 320 and be perpendicularly incident on the receiving surface of the power meter 2. The end of the second component 32 near the power meter 2 opens towards the light-receiving surface of the power meter 2 and is fixedly connected to the power meter 2. Thus, the laser optical path between the aperture and the power meter can be sealed by means of the structurally simple second component 32, and a stable connection between the aperture and the power meter can be achieved.

[0054] In a preferred embodiment, the first component 31 is formed as a cylindrical water-cooled outer shell with a hollow water-cooling channel and an inlet and an outlet communicating with the water-cooling channel. This not only seals the laser path between the laser output head 1 and the second component 32 by means of the first component 31, particularly blocking the scattered laser light blocked by the aperture outside the second component 32, but also cools the device by supplying coolant to the first component 31 to remove the heat converted from this portion of the laser power. In one example, the first component 31 can be integrally hollow. More preferably, the first component 31 can contain one or more water-cooling channels with specific paths, such as a water-cooling channel spiraling upwards around the peripheral wall of the first component 31 to the top wall and then spiraling downwards, or multiple parallel water-cooling channels in the same direction in basic sections, etc. The number and path of the water-cooling channels can be arbitrarily designed as needed, allowing the coolant to flow through the first component 31 in a reasonable manner to remove more heat.

[0055] In a preferred embodiment, the laser output head 1 is mounted in a mounting hole on the end wall of the first component 31 away from the power meter 2, and the water cooling channel includes at least one or more water cooling channels passing through the end wall. Since most of the scattered laser light blocked by the aperture outside the second component 32 is distributed between the end wall of the first component 31 and the second component 32, the heat generated by these laser lights can be effectively removed by the coolant in the end wall, thereby improving the cooling efficiency.

[0056] In a preferred embodiment, both the inlet and outlet are located at or near the end of the first component 31 furthest from the laser output head 1. Thus, as... Figure 2 As exemplarily shown by the black arrows, this design helps to maximize the area of ​​the cooling channels within the first component 31 through proper design, allowing the coolant to flow over a larger area of ​​the first component 31 and thus enhancing the cooling effect.

[0057] In a preferred embodiment, within the first component 31, the inner wall of the first component 31 and the outer wall of the second component 32 are spaced apart to form a closed cavity. This allows for a more uniform heat distribution between the first component 31 and the second component 32, and also allows the heat converted from the scattered laser to contact the area of ​​the water-cooling channel as much as possible, thereby enhancing the cooling effect.

[0058] In a preferred embodiment, the position adjustment component 4 includes a slide rail 41, a slider 42, and a drive source 43. The slider 42 is fixedly connected to the first component 31, and the slide rail 41 and the drive source 43 are fixed on the fixed support 6.

[0059] In a preferred embodiment, the slide rail 41 is or includes a lead screw, the slider 42 is mounted on the lead screw through a threaded hole that mates with the lead screw thread, and the drive source 43 drives the lead screw to rotate, causing the slider 42 to move along the lead screw.

[0060] In a preferred embodiment, the drive source 43 is a motor.

[0061] Although specific embodiments of the present invention are described in detail herein, they are given for illustrative purposes only and should not be construed as limiting the scope of the present invention. Various substitutions, alterations, and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. A laser divergence angle measuring device, characterized in that, The laser divergence angle measuring device (100) includes: A laser output head (1) and a power meter (2) are positioned opposite each other; The sealing assembly (3) includes a first component (31) fixedly connected to the laser output head (1) and a second component (32) fixedly connected to the power meter (2). The first component (31) is slidably sleeved on the second component (32) so that the sealing assembly (3) seals the laser optical path between the laser output head (1) and the power meter (2), and the second component (32) has an aperture. A position adjustment component (4) configured to adjust the relative position between the first component (31) and the second component (32) of the closure component (3); and The control unit (5) is electrically connected to the laser output head (1), the power meter (2) and the position adjustment assembly (4).

2. The laser divergence angle measuring device according to claim 1, characterized in that, The control unit (5) is configured to control the position adjustment component (4) based on a predetermined power ratio to determine the distance between the laser output head (1) and the aperture of the second component (32), and to determine the laser divergence angle based on the distance and the size parameters of the aperture (320) of the aperture. The predetermined power ratio is a preset ratio between the laser power received by the power meter (2) and the laser power output by the laser output head (1).

3. The laser divergence angle measuring device according to claim 2, characterized in that, The predetermined power ratio is 86.5%.

4. The laser divergence angle measuring device according to any one of claims 1 to 3, characterized in that, The second component (32) is formed as a cylindrical aperture cover, with one end near the laser output head (1) forming the aperture, wherein the light-passing hole (320) of the aperture is aligned with the light-emitting point (P) of the laser output head (1), and the end near the power meter (2) opens toward the light-receiving surface of the power meter (2) and is fixedly connected to the power meter (2).

5. The laser divergence angle measuring device according to any one of claims 1 to 3, characterized in that, The first component (31) is formed as a cylindrical water-cooling shell having a hollow water-cooling channel and an inlet and an outlet communicating with the water-cooling channel.

6. The laser divergence angle measuring device according to claim 5, characterized in that, The laser output head (1) is installed in a mounting hole on the end wall of the first component (31) away from the power meter (2), and the water cooling channel includes at least one or more water cooling channels passing through the end wall; and / or Both the inlet and the outlet are located at or near the end of the first component (31) away from the laser output head (1).

7. The laser divergence angle measuring device according to claim 5, characterized in that, Within the first component (31), the inner wall of the first component (31) and the outer wall of the second component (32) are spaced apart from each other to form a closed cavity.

8. The laser divergence angle measuring device according to any one of claims 1 to 3, 6, and 7, characterized in that, The laser divergence angle measuring device (100) also includes a fixed support (6), and the position adjustment component (4) and the power meter (2) are fixedly installed on the fixed support (6).

9. The laser divergence angle measuring device according to claim 8, characterized in that, The position adjustment component (4) includes a slide rail (41), a slider (42) and a drive source (43). The slider (42) is fixedly connected to the first component (31), and the slide rail (41) and the drive source (43) are fixed on the fixed support (6).

10. The laser divergence angle measuring device according to claim 9, characterized in that, The slide rail (41) is or includes a lead screw, the slider (42) is mounted on the lead screw through a threaded hole that mates with the lead screw, and the drive source (43) moves the slider (42) along the lead screw by driving the lead screw to rotate; and / or The driving source (43) is a motor.

Images