A laser reflection device and a laser

Abstract

This application provides a laser reflection device and a laser. The laser reflection device provided by this application includes: a transmitting optical fiber, a receiving optical fiber, a reflector, and a convex lens. The beam emission and reception directions are opposite to each other. The convex lens is located between the transmitting optical fiber and the reflector, and also between the receiving optical fiber and the reflector. The beam is emitted from the transmitting optical fiber. After leaving the transmitting optical fiber, the beam usually diffuses. After passing through the convex lens, the beam becomes collimated. It is then reflected by the reflector, focused by the convex lens again, and then enters the center of the receiving optical fiber. By adjusting the rotation of the reflector around the Y-axis or X-axis, and by adjusting the rotation of the reflector around the Z-axis, the coordinates of the beam incident on the end face in both the X-axis and Y-axis directions are adjusted, so that the beam can be incident on the center of the end face, making full and effective use of the beam.

Description

Technical Field

[0001] This application relates to the field of laser technology, and in particular to a laser reflecting device and a laser. Background Technology

[0002] As laser technology matures, laser beams are increasingly used for cutting, welding, drilling, marking, and scribing workpieces made of various materials. Traditional machining can produce unwanted defects, such as microcracks or burrs that may form when the workpiece is under stress, thus degrading and weakening the strength and quality of the workpiece. Laser processing minimizes these unwanted defects, is generally cleaner, and results in a smaller heat-affected zone. Laser processing uses a focused laser beam to produce precise cuts and holes with high-quality edges, minimizing the formation of unwanted defects.

[0003] Fiber lasers, due to their high power and high beam quality, have been widely used in industrial laser processing applications, such as laser cutting and welding of metals and metal alloys. Normally, the laser beam propagates forward through the fiber, but in some special applications, it is necessary to use reflectors to reverse the laser beam propagation, such as reverse fiber couplers.

[0004] To achieve laser reverse transmission, a reflector is required. Reflection creates a reflection angle, and the manufacturing of components inherently involves errors. During assembly, it's often difficult to ensure a perfect fit at the installation angle, and sometimes, for repeated use, the reflection angle needs to be adjustable to ensure the beam reaches the center of the target fiber. Furthermore, as... Figure 1 As shown, the center of the target optical fiber is on the end face of the fiber, which belongs to two-dimensional coordinates, namely X and Y coordinates. It is extremely difficult for existing optical devices to adjust the angles of both dimensions at the same time. After the beam is adjusted, the accuracy of the beam entering the target coordinates cannot be guaranteed at the same time.

[0005] Therefore, it is necessary to design a laser reflection device that can adjust the two-dimensional movement of the laser beam in the X and Y directions on the end face of the target optical fiber to solve the problem of flexible beam adjustment. At the same time, it is also necessary to set up a fixing and clamping mechanism to solve the accuracy and stability of the beam reaching the target coordinates. Summary of the Invention

[0006] This application provides a laser reflecting device and a laser. The laser reflecting device provided by this application includes: a transmitting optical fiber, a receiving optical fiber, a reflector, and a convex lens. The beam emission and reception directions are opposite to each other (it should be noted that the opposite directions here are approximately opposite, not necessarily exactly 180° opposite; for example, a deviation of less than 10° from 170° can also be considered as the opposite direction described in this application). The convex lens is located between the transmitting optical fiber and the reflector, and also between the receiving optical fiber and the reflector. The beam is emitted from the transmitting optical fiber. After leaving the transmitting optical fiber, the beam usually diffuses. After passing through the convex lens, the beam becomes collimated, then is reflected by the reflector, and then focused by the convex lens before entering the center of the receiving optical fiber.

[0007] The receiving optical fiber has an end face. A three-dimensional coordinate system is set with the center of the end face as the origin. The X-axis and Y-axis are located on the end face and are perpendicular to each other, while the Z-axis passes through the center of the end face and is perpendicular to it. The reflector of this application has two adjustable degrees of freedom, which can be used to change the coordinates of the light beam incident on the end face in the X-axis direction and the Y-axis direction, respectively.

[0008] The difference between this application and the prior art is that the laser reflection device of this application changes the coordinates of the beam in the X-axis direction or the Y-axis direction on the end face by adjusting the rotation of the reflector 3 around the Y-axis or around the X-axis. In addition, by adjusting the rotation of the reflector 3 around the Z-axis, the coordinates of the beam in the X-axis direction and the Y-axis direction on the end face are changed simultaneously. Thus, the coordinates of the beam in the X-axis direction and the Y-axis direction on the end face are both adjusted, so that the beam can be incident on the center of the end face, making full and effective use of the beam.

[0009] Simultaneously designing both rotational degrees of freedom around the Y-axis and around the X-axis would make the mounting and clamping of the reflector difficult, meaning that designing the mounting and clamping mechanism for the reflector would be challenging. Designing both rotational degrees of freedom around the Y-axis or X-axis, as well as rotational degrees of freedom around the Z-axis, would reduce the difficulty of designing the mounting and clamping mechanism for the reflector.

[0010] An embodiment of this application also provides a laser, which includes the laser reflection device described above, through which the laser beam transmitted by the laser is transmitted in reverse in different optical fibers. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a first structural schematic diagram of the laser reflection device of this application;

[0013] Figure 2 This is a schematic diagram of the receiving optical fiber of the laser reflection device of this application;

[0014] Figure 3 This is a schematic diagram of the second structure of the laser reflection device of this application;

[0015] Figure 4 This is a schematic diagram of the third structure of the laser reflection device of this application;

[0016] Figure 5 This is a schematic diagram of the fixed structure of the reflector in this application.

[0017] Reference numerals: 1. Transmitting fiber, 2. Receiving fiber, 2a. End face, 3. Reflector, 4. Convex lens, 5. Beam, 6. Z-axis rotating component, 7. Collimating head, 8. Quartz cap end, 31. Reflector fixing component, 31a. Outer surface, 32. Reflector retaining ring, 33. Pin retaining ring, 34. Rotating pin, 341. Pin opening. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] like Figure 1 As shown, Figure 1 This is a first structural schematic diagram of the laser reflection device of this application. The laser reflection device includes: a transmitting optical fiber 1, a receiving optical fiber 2, a reflecting mirror 3, and a convex lens 4. The beam emission and reception directions are opposite to each other. The convex lens 4 is located between the transmitting optical fiber 1 and the reflecting mirror 3, and also between the receiving optical fiber 2 and the reflecting mirror 3. The beam 5 is emitted from the transmitting optical fiber 1. After leaving the transmitting optical fiber 1, the beam 5 usually diffuses. After passing through the convex lens 4, the beam 5 becomes collimated light, then is reflected by the reflecting mirror 3, and is focused again after passing through the convex lens 4 before entering the center of the receiving optical fiber 2.

[0020] like Figure 2 As shown, Figure 2 This is a schematic diagram of the receiving optical fiber 2 of the laser reflection device of this application. The receiving optical fiber 2 has an end face 2a. A three-dimensional coordinate system is set with the center of the end face 2a as the origin. The X-axis and Y-axis are located on the end face 2a and are perpendicular to each other, while the Z-axis passes through the center of the end face 2a and is perpendicular to the end face 2a. (Combined with...) Figure 1 and Figure 2 The reflector 3 of this application has two adjustable degrees of freedom, which can be used to change the coordinates of the beam 5 incident on the end face 2a along the X-axis and Y-axis, respectively. Typically, the coordinates of the beam 5 incident on the end face 2a can be changed by designing rotational degrees of freedom around the Y-axis and around the X-axis; the X-axis and Y-axis are also called the Y-axis rotation axis and X-axis rotation axis, respectively. By adjusting the two degrees of freedom of the reflector 3, the coordinates of the beam 5 on the end face 2a along the X-axis and Y-axis can be changed. That is, when the reflector 3 rotates around the Y-axis, the coordinates of the beam 5 on the end face 2a along the X-axis can be changed; when the reflector 3 rotates around the X-axis, the coordinates of the beam 5 on the end face 2a along the Y-axis can be changed.

[0021] In an optional configuration, the reflector 3 has a reflective film only on the side closest to the transmitting fiber 1 and the receiving fiber 2. The light beam 5 is reflected from the transmitting fiber 1 through the reflective film on the reflector 3 to the receiving fiber 2. The maximum rotation angle of the reflector 3 around the X-axis and Y-axis is 90°.

[0022] In an optional configuration, reflective films are provided on both sides of the reflector 3. The light beam 5 is reflected from the transmitting fiber 1 through the reflective film on the reflector 3 to the receiving fiber 2. The maximum rotation angle of the reflector 3 around the X-axis and Y-axis is 180 degrees.

[0023] However, designing both the Y-axis and X-axis rotational degrees of freedom simultaneously will make it difficult to fix and clamp the reflector 3.

[0024] To solve the above problems, such as Figures 3-5 As shown, Figure 3 This is a second structural schematic diagram of the laser reflection device of this application. Figure 4 This is a schematic diagram of the third structure of the laser reflection device of this application. Figure 5This is a schematic diagram of the mounting structure of the reflector according to this application. The laser reflecting device also includes a reflector fixing member 31 and a Z-axis rotating component 6. The Z-axis rotating component 6 is cylindrical. When the Z-axis rotating component 6 rotates around the Z-axis, it can drive the reflector 3 to rotate around the Z-axis, generating a degree of freedom for the reflector 3 around the Z-axis. The outer surface 31a of the reflector fixing member 31 is cylindrical or at least has a spherical structure with one side cut off. It is fitted inside the cylindrical Z-axis rotating component 6. The Z-axis rotating component 6 and the reflector fixing member 31 have an opening on the side near the transmitting optical fiber 1 and the receiving optical fiber 2, through which the light beam 5 enters and exits. The reflector fixing component 31 is also provided with a rotating pin 34. Based on the connection design of the Z-axis rotating component 6 and the reflector fixing component 31, when the outer surface 31a of the reflector fixing component 31 is cylindrical, the reflector fixing component 31 can drive the reflector 3 to rotate around the axis of the rotating pin 34, which can generate a degree of freedom in one of the X-axis or Y-axis rotation. At this time, the fixing and clamping of the laser reflection device is also easier to design, which can ensure the overall accuracy and stability of the laser reflection device.

[0025] When the outer surface 31a of the reflector fixture 31 is a spherical structure with at least one side cut off, the plane formed by the cut-off side is perpendicular to the Z rotation axis. It can be designed so that the reflector fixture 31 drives the reflector 3 to rotate around the axis of the rotating pin 34. Theoretically, it can generate a degree of freedom in one of the X or Y rotation axes. Compared with the reflector fixture 31 with a cylindrical outer surface 31a, the fixing and clamping of the laser reflection device is more difficult to design, the stability of the device will be weakened, and the area of ​​the reflector 3 that can reflect the beam 5 will be reduced.

[0026] It should be noted that, as Figure 3 As shown, when the transmitting fiber 1 and the receiving fiber 2 have different coordinates on the Y-axis but the same coordinates on the X-axis, the coordinates of the beam 5 incident on the end face 2a can be changed by adjusting the reflector 3 to rotate around the X-axis. When rotating around the Z-axis, the coordinates of the beam 5 incident on the end face 2a can be changed in both the X-axis and Y-axis directions. Thus, the beam 5 can be incident on the center of the end face 2a, making full and effective use of the beam 5.

[0027] Furthermore, when the transmitting fiber 1 and the receiving fiber 2 have different coordinates on the Y-axis but the same coordinates on the X-axis, the coordinates of the beam 5 incident on the end face 2a can be changed by adjusting the rotation of the reflector 3 around the Y-axis.

[0028] However, as Figure 1As shown, the reflector 3 needs to be tilted to the emitted beam 5 of the transmitting fiber 1. Only when rotating around the Z-axis can the coordinates of the beam 5 on the end face 2a be changed, allowing the beam 5 to be incident on the center of the end face 2a, thus making full and effective use of the beam 5. That is, if the reflector 3 and the emitted beam 5 of the transmitting fiber 1 are exactly perpendicular, rotation around the Y-axis and Z-axis can only change the coordinates in the x-axis direction, not the y-axis direction, and the beam 5 cannot enter the receiving fiber 2.

[0029] In a preferred embodiment, when the transmitting fiber 1 and the receiving fiber 2 have different coordinates on the Y-axis but the same coordinates on the X-axis, the reflector 3 is adjusted to rotate around the Y-axis and around the Z-axis. The side of the reflector 3 closest to the transmitting fiber 1 is tilted towards the transmitting fiber 1. At this time, the required rotation angle does not need to be too large, so that the beam 5 can enter the receiving fiber 2, which reduces the design difficulty of the fixing and clamping mechanism.

[0030] Similarly, when the transmitting fiber 1 and the receiving fiber 2 have different coordinates on the X-axis but the same coordinates on the Y-axis, the same problem will occur. A similar solution can be used, that is, the X-axis and Y-axis are just defined directions and can be interchanged. This will not be elaborated further here.

[0031] like Figure 3 As shown, in a specific embodiment, the laser reflection device further includes a quartz cap end 8, one end of which is fixed and clamps the transmitting optical fiber 1 and the receiving optical fiber 2, so as to stably fix the transmitting optical fiber 1 and the receiving optical fiber 2 without affecting the transmission direction of the beam 5.

[0032] In a specific embodiment, a collimator 7 is also provided on the outer side of the quartz cap end 8. The collimator 7 is located on the inner side of the Z-axis rotating component 6, which provides a stable fixation for the quartz cap end 8.

[0033] In a specific embodiment, the laser reflection device further includes a reflector pressure ring 32, which stably seals and fixes the reflector 3 in the position after the reflector 3 rotates around the X-axis or Y-axis to reach the ideal position.

[0034] In a specific embodiment, the laser reflection device further includes a pin retaining ring 33. After the rotating pin 34 is twisted to a preset position, the pin retaining ring 33 forms a stable seal for the rotating pin 34 and fixes it in that position.

[0035] like Figure 5As shown, in a specific embodiment, the rotating pin 34 is provided with a pin opening 341. The pin opening 341 can be rotated by using a tool, thereby facilitating the twisting of the rotating pin 34 and driving the reflector to rotate around the X rotation axis or the Y rotation axis.

[0036] An embodiment of this application also provides a laser, which includes the laser reflection device described above, through which the laser beam 5 transmitted by the laser is transmitted in reverse in different optical fibers.

[0037] It should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Positional relational terms such as "up," "down," "left," "right," "front," "back," "inner," and "outer" are used to facilitate the reader's understanding of the orientation of the product structure, and do not necessarily require the product structure to actually be in that direction. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, thereby including elements inherent in a process, method, article, or device that includes a list of elements. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or device that includes said element. Additionally, the parts of the technical solutions provided in the embodiments of this application that are consistent with the implementation principles of corresponding technical solutions in the prior art have not been described in detail to avoid excessive elaboration.

[0038] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made to this application without departing from the principles of this application, and the various embodiments in this application can be combined. These improvements, modifications, and combinations also fall within the protection scope of the claims of this application. That is, the claims of this application can arbitrarily combine the embodiments of this application, and are not limited to the limited combinations of embodiments passed by this application.

Claims

1. A laser reflection device, characterized in that, include: The beam (5) is emitted and received in opposite directions. The convex lens (4) is located between the emitting fiber (1) and the reflecting fiber (3), and also between the receiving fiber (2) and the reflecting mirror (3). The beam (5) is emitted from the transmitting fiber (1). After leaving the transmitting fiber (1), the beam (5) becomes collimated after passing through the convex lens (4), then is reflected after encountering the reflector (3), and is focused after passing through the convex lens (4) again, and then enters the center of the receiving fiber (2). The receiving optical fiber (2) has an end face (2a). A three-dimensional coordinate system is set with the center of the end face (2a) as the origin. The X-axis and Y-axis are located on the end face (2a) and are perpendicular to each other. The Z-axis passes through the center of the end face (2a) and is perpendicular to the end face (2a). The X-axis and the Y-axis are called the Y rotation axis and the X rotation axis, respectively. The Z-axis is called the Z rotation axis. The laser reflection device also includes a mirror fixing component (31) and a Z-axis rotating component (6). The Z-axis rotating component (6) is cylindrical. When the Z-axis rotating component (6) rotates around the Z-axis, it drives the mirror (3) to rotate around the Z-axis, generating the degree of freedom of the mirror (3) around the Z-axis. The outer surface (31a) of the mirror fixing member (31) is cylindrical or at least has a spherical structure with one side cut off, and is fitted inside the cylindrical Z-axis rotating component (6); The Z-axis rotating component (6) and the reflector fixing component (31) have an opening on the side near the transmitting fiber (1) and the receiving fiber (2), through which the light beam (5) enters and exits; The mirror fixing member (31) is provided with a rotating pin (34). Based on the connection design of the Z-axis rotating component (6) and the mirror fixing member (31), when the outer surface (31a) of the mirror fixing member (31) is cylindrical, the mirror fixing member (31) drives the mirror (3) to rotate around the axis of the rotating pin (34), so that the mirror (3) has two adjustable degrees of freedom. The coordinates of the beam (5) incident on the end face (2a) in the X-axis direction and the coordinates in the Y-axis direction can be changed through the two adjustable degrees of freedom.

2. The laser reflection device as described in claim 1, characterized in that, The reflector (3) has a reflective film on only the side close to the transmitting fiber (1) and the receiving fiber (2). The light beam (5) is reflected from the transmitting fiber (1) through the reflective film on the reflector (3) to the receiving fiber (2). The maximum rotation angle of the reflector (3) around the X-axis and Y-axis is 90°.

3. The laser reflection device as described in claim 1, characterized in that, The reflector (3) has reflective films on both sides. The light beam (5) is reflected from the transmitting fiber (1) through the reflective film on the reflector (3) to the receiving fiber (2). The maximum rotation angle of the reflector (3) around the X-axis and Y-axis is 180 degrees.

4. The laser reflection device as described in claim 1, characterized in that, When the outer surface (31a) of the reflector fixing member (31) is cylindrical, the reflector fixing member (31) causes the reflector (3) to rotate around the axis of the rotating pin (34), generating a degree of freedom in one of the X rotation axis or the Y rotation axis. The reflector (3) needs to be tilted to form an outgoing beam (5) of the transmitting fiber (1).

5. The laser reflection device as described in claim 4, characterized in that, When the transmitting fiber (1) and the receiving fiber (2) have different coordinates on the Y-axis but the same coordinates on the X-axis, the reflector (3) is adjusted to rotate around the Y-axis and around the Z-axis. The side of the reflector (3) closest to the transmitting fiber (1) is tilted toward the transmitting fiber (1).

6. The laser reflection device as described in claim 1, characterized in that, The laser reflection device also includes a quartz cap end (8), one end of which is fixed and clamps the transmitting optical fiber (1) and the receiving optical fiber (2).

7. The laser reflection device as described in claim 6, characterized in that, A collimator (7) is also provided on the outer side of the quartz cap end (8). The collimator (7) is located on the inner side of the Z-axis rotating component (6) and provides a stable fixation function for the quartz cap end (8).

8. The laser reflection device as described in claim 1, characterized in that, The laser reflection device also includes a reflector retaining ring (32), which, after the reflector (3) rotates around the X-axis or Y-axis to reach the ideal position, stably seals and fixes the reflector (3) in that position; The laser reflection device also includes a pin retaining ring (33). After the rotating pin (34) is twisted to a preset position, the pin retaining ring (33) forms a stable seal and fixes the rotating pin (34) at that position.

9. The laser reflection device as described in claim 1, characterized in that, The rotating pin (34) is provided with a pin opening (341). The pin opening (341) can be rotated by using a tool, which facilitates the twisting of the rotating pin (34) and drives the reflector to rotate around the X-axis or Y-axis.

10. A laser, characterized in that, The laser reflector includes any one of claims 1-9, through which the laser beam (5) transmitted by the laser is transmitted in reverse in different optical fibers.

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