Laser light guide arm

Abstract

The application discloses a laser light guide arm. The laser light guide arm comprises a main light guide barrel and a light beam calibration assembly. The main light guide barrel comprises an incident end and an exit end for transmitting a laser beam from the incident end to the exit end; the light beam calibration assembly comprises a light guide mounting piece and an aperture diaphragm, a first mirror, a polarizer, a 1 / 4 wave plate and a reflective neutral density filter wheel arranged in sequence along an optical path in the light guide mounting piece, and the light guide mounting piece is arranged at the incident end of the main light guide barrel; and the light guide mounting piece is provided with a color development calibration card in the reflection direction of the polarizer to the laser beam, so that the laser spot reflected by the polarizer is displayed on the color development calibration card. According to the application, the laser beam is transmitted in the main light guide barrel after the laser beam passes through the light beam calibration assembly. In the light beam calibration assembly, the first mirror can be adjusted, and the position of the laser spot displayed on the color development calibration card can be obtained in real time, so that the laser optical path can be accurately calibrated, and the application is especially suitable for rapid calibration of invisible light.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser processing, in particular to a laser light guide arm. BACKGROUND

[0002] The laser light guide arm is a device for accurately guiding laser light to a processing position, which can ensure stable transmission and accurate positioning of the laser light. The laser light guide arm is divided into two types: a reflective light guide arm and a fiber delivery type light guide arm.

[0003] The reflective light guide arm is often composed of multiple light guide tubes, mirrors and lenses, which can increase the flexibility and functionality of the light guide arm. However, the increase in optical path and optical elements also imposes more stringent requirements on the angle of the incident light beam. The existing reflective light guide arm lacks a calibration mechanism, which requires repeated forward and backward adjustments during use to ensure normal light guiding, which is blind and difficult to achieve accurate coupling and efficient light guiding, especially for invisible infrared light. SUMMARY

[0004] The present application provides a laser light guide arm, which aims to solve the problem of being unable to quickly and accurately calibrate the laser light path in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a laser light guide arm. The laser light guide arm comprises:

[0006] A main light guide tube comprising an incident end and an exit end, for transmission of a laser beam from the incident end to the exit end;

[0007] A beam calibration assembly comprising a light guide mounting and an aperture stop, a first mirror, a polarizer, a 1 / 4 wave plate and a reflective neutral density filter wheel arranged in sequence along the optical path in the light guide mounting; the light guide mounting is arranged at the incident end of the main light guide tube; the aperture stop is arranged near the light inlet of the light guide mounting, and the first mirror is adjustably arranged at the corner of the light guide mounting to correct the transmission optical path of the laser beam; the polarizer is used to transmit the laser beam reflected by the first mirror and transmit it to the 1 / 4 wave plate and the reflective neutral density filter wheel, so that the polarization state of the laser beam is converted by the 1 / 4 wave plate, and based on the transmission rate setting of the reflective neutral density filter wheel, part of the laser beam is transmitted into the main light guide tube for transmission, and the other part of the laser beam is reflected to the polarizer along the original path;

[0008] In addition, the light guide mounting is provided with a color development calibration card in the reflection direction of the laser beam by the polarizer, and the laser beam reflected by the polarizer is displayed on the color development calibration card.

[0009] In some embodiments, the light guide assembly comprises a first "L"-shaped light guide tube, a sleeve, and a second "L"-shaped light guide tube, one end of the first "L"-shaped light guide tube is connected to the second "L"-shaped light guide tube through the sleeve, and the other end of the second "L"-shaped light guide tube is connected to the main light guide tube.

[0010] In some embodiments, the first "L"-shaped light guide tube and the sleeve are rotatably connected, the second "L"-shaped light guide tube and the sleeve are rotatably connected, and the second "L"-shaped light guide tube and the main light guide tube are rotatably connected.

[0011] In some embodiments, the aperture stop is arranged close to the light inlet of the first "L"-shaped light guide tube, the first mirror is arranged at the corner of the first "L"-shaped light guide tube, the polarizer and the color calibration card are arranged on the sleeve, and the 1 / 4 wave plate and the reflective neutral density filter wheel are arranged on the second "L"-shaped light guide tube close to the tail end of the main light guide tube.

[0012] In some embodiments, a second mirror is arranged at the corner of the second "L"-shaped light guide tube, and the second mirror is used to reflect the laser beam transmitted by the polarizer to the 1 / 4 wave plate.

[0013] In some embodiments, the aperture size of the aperture stop is adjustable.

[0014] In some embodiments, a shielding piece is arranged between the color calibration card and the polarizer, the shielding piece can be shielded between the polarizer and the color calibration card to block the transmission of the laser beam reflected by the polarizer to the color calibration card, or

[0015] The shielding piece can be withdrawn from between the polarizer and the color calibration card to open the transmission of the laser beam reflected by the polarizer to the color calibration card.

[0016] In some embodiments, the substrate material of the polarizer and the reflective neutral density filter wheel matches the laser beams of different wavebands, and a gradient film with a corresponding thickness is coated on the reflective neutral density filter wheel based on different substrate materials.

[0017] In some embodiments, the substrate material is one of B270 glass, calcium fluoride, barium fluoride, and zinc selenide.

[0018] In some embodiments, an anti-reflection film matching different waveband laser beams is also coated on the substrate of the reflective neutral density filter wheel, and a scale mark for indicating the optical density value is arranged on the reflective neutral density filter wheel.

[0019] In some embodiments, the main light guide tube comprises at least two sub light guide tubes, and a rotating joint is arranged between adjacent sub light guide tubes.

[0020] In some embodiments, a laser hand tool is arranged at the exit end of the main light guide tube; the laser hand tool is provided with a laser shaping lens and a lens barrel slidingly arranged at the output end of the laser hand tool, and the lens barrel is provided with a lens.

[0021] The technical scheme of the present application provides a laser light guide arm. The laser light guide arm comprises a main light guide tube and a light beam calibration assembly. The main light guide tube comprises an incident end and an exit end, and is used for transmitting a laser beam from the incident end to the exit end. The light beam calibration assembly comprises a light guide mounting member, an aperture diaphragm, a first mirror, a polarizer, a 1 / 4 wave plate and a reflective neutral density filter wheel which are sequentially arranged in the light guide mounting member along an optical path, and the light guide mounting member is provided with a color development calibration card in the reflection direction of the polarizer. The laser beam reflected by the polarizer is displayed on the color development calibration card. In the technical scheme of the present application, the laser beam enters the main light guide tube for transmission after passing through the light beam calibration assembly. In the light beam calibration assembly, the laser beam sequentially passes through the aperture diaphragm, the first mirror, the polarizer and the 1 / 4 wave plate, and then is transmitted to the radial filter wheel. Based on the transmittance setting of the reflective neutral density filter wheel, part of the laser beam is transmitted as a working laser beam into the main light guide tube for further transmission, and the other part of the laser beam is reflected by the reflective neutral density filter wheel in the original path. The reflected laser beam is further reflected by the polarizer to the color development calibration card for spot display. Therefore, whether the laser beam path is collimated can be determined by observing whether the laser spot position and the diffraction pattern displayed on the color development calibration card are centrally symmetric. If not, the first mirror can be adjusted for calibration. Therefore, the position feedback of the laser spot displayed on the color development calibration card can be obtained in real time by adjusting the first mirror, so as to accurately calibrate the laser beam path. The technical scheme is particularly suitable for rapid calibration of invisible light. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 It is a structural schematic diagram of the laser light guide arm of an embodiment of the present application.

[0024] Figure 2 It is a structural schematic diagram of the light beam calibration assembly in an embodiment of the present application.

[0025] Figure 3 Figure 1 is a schematic diagram of a laser handpiece according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the direction indications also change accordingly.

[0028] It should also be noted that when an element is referred to as being “fixed” or “set” on another element, it can be directly on the other element or can have a middle element. When an element is referred to as being “connected” to another element, it can be directly connected to the other element or can have a middle element.

[0029] In addition, the description involving “first”, “second” and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is also not within the protection scope claimed by the present application.

[0030] Reference is made to Figure 1 and Figure 2As shown, the present application proposes a laser light guide arm 100. The laser light guide arm 100 comprises a main light guide barrel 10 and a light beam calibration assembly 20. The main light guide barrel 10 is the main channel for laser beam transmission, comprising an incident end and an exit end, for the transmission of the laser beam from the incident end to the exit end; wherein the main light guide barrel 10 comprises at least two sub-light guide barrels, and a rotating joint is arranged between adjacent sub-light guide barrels, which can allow the relative rotation between adjacent sub-light guide barrels, thereby flexibly adjusting the conduction direction of the light to adapt to different application scenarios and layout requirements. The light beam calibration assembly 20 is arranged at the incident end of the main light guide barrel 10, so that the laser beam can be calibrated based on the light beam calibration assembly 20 before entering the main light guide barrel 10 for transmission, to ensure that the laser beam remains in the best state during transmission.

[0031] Wherein the light beam calibration assembly 20 is concentrically connected to the main light guide barrel 10 through a light guide mounting member 21, and various optical elements are arranged in the light guide mounting member 21 to assist the transmission of the laser beam. Specifically, it comprises an aperture stop 22, a first mirror 23, a polarizer 24, a 1 / 4 wave plate 25 and a reflective neutral density filter wheel 26 arranged in sequence along the light path; and the light guide mounting member 21 is provided with a color calibration card 27 in the reflection direction of the laser beam by the polarizer 24. The light path transmission process of the laser beam in the light beam calibration assembly 20 is as follows:

[0032] First, the aperture stop 22 is arranged close to the light inlet of the light guide mounting member 21, and the laser beam is incident to the first mirror 23 through the center of the aperture stop 22, and then the laser beam reflected by the first mirror 23 transmits through the polarizer 24 and continues to transmit to the 1 / 4 wave plate 25 and the reflective neutral density filter wheel 26; when reaching the reflective neutral density filter wheel 26, part of the laser beam transmits into the main light guide barrel 10 as working laser beam, and another part of the laser beam is reflected to the polarizer 24 as verification laser beam, and then reflected by the polarizer 24 to the color calibration card 27 for spot display.

[0033] The principle of realizing the fast calibration of the light beam is that because the polarization direction of the light beam reflected by the first mirror 23 is consistent with the transmission direction of the polarizer 24, the light beam can smoothly transmit through the polarizer 24 to the 1 / 4 wave plate 25, and then the polarization state of the light beam is rotated by 45° at the 1 / 4 wave plate 25 and then is incident on the reflective neutral density filter wheel 26. Based on the structural design and optical characteristics of the reflective neutral density filter wheel 26, when the light beam is incident on the reflective neutral density filter wheel 26, part of the light beam is reflected, and the other part is transmitted. In this way, the light beam transmitted into the main light cylinder 10 can be used as the working light beam, and the reflected light beam can be used as the verification light beam. The verification light beam is reflected back and then passes through the 1 / 4 wave plate 25 again, and the polarization state is rotated by 45° again, so that the polarization direction of the verification light beam is perpendicular to that of the original incident light beam. Further, when the verification light beam is transmitted to the polarizer 24, it is reflected by the polarizer 24 to the color developing calibration card 27. The color developing calibration card 27 is made of a heat-sensitive material, and when the light beam hits the color developing calibration card 27, the position of the laser spot on the color developing calibration card 27 changes in color, thereby facilitating the operator to intuitively obtain the distribution of the laser spot, so as to determine whether the laser light path is collimated. Moreover, for the transmission of invisible light, whether the light path is collimated can also be determined based on the display state of the laser spot on the color developing calibration card 27, which has strong adaptability.

[0034] It can be understood that the color developing calibration card 27 is accurately fixed, and a cross-shaped wire is arranged on the color developing calibration card 27 as a position reference. When the light spot of the verification light beam on the color developing calibration card 27 coincides with the intersection point of the cross-shaped wire, and the diffraction pattern generated by the light beam passing through the aperture diaphragm 22 is centrally symmetric, it is considered that the light beam is transmitted along the predetermined light path and is in a collimated state. Otherwise, it is considered that the laser light path needs to be calibrated. The calibration process includes adjusting the first mirror 23, and based on the adjustment of the first mirror 23, the position of the laser spot appearing on the color developing calibration card 27 is observed in real time until the laser spot coincides with the intersection point of the cross-shaped wire.

[0035] It is worth noting that by default, when the light beam is incident, the center of the light beam is coaxial with the center of the aperture diaphragm 22, so that when the light spot of the verification light beam is located at the intersection point of the cross-shaped wire, the diffraction pattern should be in a centrally symmetric state. However, if the light spot of the verification light beam is located at the intersection point of the cross-shaped wire, but the diffraction pattern is not centrally symmetric, it indicates that the light beam is not incident at the center when it passes through the aperture diaphragm 22. At this time, the components other than the laser light guide arm 100 need to be adjusted, such as the setting of the laser connected to the other end of the light beam calibration assembly 20, to cooperate with the adjustment of the first mirror 23 to achieve the collimation effect of the laser light path.

[0036] In the technical solution of the present application, the first reflector 23 is arranged at the corner of the light guide mounting member 21, facilitating installation and light path adjustment. The first reflector 23 is arranged on a support member, and an adjustment mechanism is further arranged between the support member and the side wall of the light guide mounting member 21. The support member can be made of nickel-iron alloy with a small thermal expansion coefficient, so that the size of the support member changes little when the temperature changes, thereby ensuring the stability of the angle of the first reflector 23 arranged thereon. The adjustment mechanism can be a screw-nut mechanism, which can realize a small adjustment amount and ensure the adjustment accuracy of the lens angle of the first reflector 23. For example, the screw-nut mechanism can be used to adjust the rotation angle and the pitch angle of the first reflector 23.

[0037] In addition, it is worth noting that, in the technical solution of the present application, the working laser beam and the verification laser beam are formed by the reflective neutral density filter wheel 26. Through the rotation adjustment of the reflective neutral density filter wheel 26, on the one hand, the power of the working laser beam can be adjusted, so that the power of the working laser beam is adjusted conveniently without the traditional power adjustment from the laser beam source; on the other hand, based on the law of conservation of energy, when the power of the working laser beam is increased, the power of the verification laser beam is relatively small, so that the power of the verification laser beam reflected to the color developing calibration card 27 can be adjusted.

[0038] Specifically, when the light path is adjusted, the verification laser beam has a low power, so that the verification laser beam can display a light spot on the color developing calibration card 27 and prevent the color developing calibration card 27 from being damaged due to the excessive power. When the calibration is completed and the formal laser beam operation is performed, the power of the working laser beam can be adjusted accordingly.

[0039] Further, to improve safety protection, a shielding piece (not shown in the drawings) is arranged between the color developing calibration card 27 and the polarizer 24. The shielding piece can be arranged between the polarizer 24 and the color developing calibration card 27 to block the transmission of the laser beam reflected by the polarizer 24 to the color developing calibration card 27, or the shielding piece can be withdrawn from between the polarizer 24 and the color developing calibration card 27 to open the transmission of the laser beam reflected by the polarizer 24 to the color developing calibration card 27. That is, the shielding piece is used to control the transmission of the verification laser beam between the polarizer 24 and the color developing calibration card 27. In this way, in the actual operation process, if the verification laser beam reflected by the reflective neutral density filter wheel 26 has a high power, the shielding piece can be controlled to be arranged between the polarizer 24 and the color developing calibration card 27, thereby effectively preventing the laser beam from damaging the color developing calibration card 27.

[0040] Referring to Figure 2As shown, in some embodiments, the light guide mounting member 21 comprises a first "L"-shaped light guide cylinder 211, a sleeve 212, and a second "L"-shaped light guide cylinder 213, one end of the first "L"-shaped light guide cylinder 211 is connected with the second "L"-shaped light guide cylinder 213 through the sleeve 212, and the other end of the second "L"-shaped light guide cylinder 213 is connected to the main light guide cylinder 10; wherein the first "L"-shaped light guide cylinder 211 and the sleeve 212, the second "L"-shaped light guide cylinder 213 and the sleeve 212, and the second "L"-shaped light guide cylinder 213 and the main light guide cylinder 10 are all rotationally connected.

[0041] In this embodiment, a specific structure of the light guide mounting member 21 is proposed. The shape of the "L"-shaped light guide cylinder and the design of multiple rotationally connected points enable the entire laser light guide arm 100 to be adjusted in multiple dimensions, providing sufficient flexibility to make it easier to meet specific installation and use requirements.

[0042] For example, one arrangement of the optical elements in the light guide mounting member 21 is as follows: the aperture stop 22 is arranged close to the light entrance of the first "L"-shaped light guide cylinder 211, the first mirror 23 is arranged at the corner of the first "L"-shaped light guide cylinder 211, the polarizer 24 and the color calibration card 27 are arranged on the sleeve 212, and the 1 / 4 wave plate 25 and the reflective neutral density filter wheel 26 are arranged at the tail end of the second "L"-shaped light guide cylinder 213 close to the main light guide cylinder 10; wherein the corner of the second "L"-shaped light guide cylinder 213 is provided with a second mirror 28, which is used to reflect the laser beam transmitted by the polarizer 24 to the 1 / 4 wave plate 25.

[0043] The first mirror 23 and the second mirror 28 are both composed of a substrate and a coating layer, and the coating layer is a metal film. Due to its high electrical conductivity and electron density, it has very high reflectivity, and common reflective materials used as metal films include gold (Au), silver (Ag), aluminum (Al), etc., which can exhibit excellent reflective performance in the visible and infrared wavebands.

[0044] In some embodiments, the aperture size of the aperture stop 22 is adjustable. By adjusting the aperture size of the aperture stop 22, the amount of light entering the beam collimation assembly 20 can be controlled.

[0045] A common adjustment method for the aperture stop 22 is as follows: the aperture stop 22 is composed of multiple movable diaphragm leaves, which rotate around a central axis, and further structure such as a diaphragm fixing ring and a diaphragm rotating ring can be arranged to change the degree of overlap between the diaphragm leaves by rotating the knob, thereby adjusting the aperture size of the diaphragm. Through reasonable layout and application of reflection, transmission and other optical principles, effective guidance and accurate processing of light are achieved.

[0046] In some embodiments, the substrate material of the polarizer 24 and the reflective neutral density filter wheel 26 matches the laser beams of different wavebands; and the gradient thin films with corresponding thicknesses are coated on the different substrate materials in the reflective neutral density filter wheel 26.

[0047] It can be understood that the laser light guide arm 100 provided by the technical scheme of the present application is suitable for light path calibration of multi-waveband lasers. In the present embodiment, by setting the substrate materials of the polarizer 24 and the reflective neutral density filter wheel 26 matched with different waveband lasers, the optimal filtering and polarization effects of different waveband lasers can be achieved, and the efficiency and stability of the laser beam system are ensured.

[0048] In the reflective neutral density filter wheel 26, because of the differences in crystal structure, chemical composition and surface morphology of different substrate materials, different effects on the optical properties such as refractive index, transmittance and reflectance of the thin film will be produced. Therefore, it is necessary to adjust the thickness and refractive index of the thin film based on different substrate materials to achieve selective reflection and transmission of light of different wavelengths.

[0049] For example, common wavebands of lasers include visible waveband, near-infrared waveband and mid-infrared waveband.

[0050] For laser beams of the visible waveband, substrate materials with high transparency and good optical properties are usually used, such as K9 glass or B270 glass (350-2000nm). For laser beams of the near-infrared waveband, materials with lower absorption and higher transmittance are required, such as ultraviolet fused quartz (350-2000nm), calcium fluoride (180-8μm) or magnesium fluoride (200nm-6μm). For laser beams of the mid-infrared waveband, materials with high transmittance and low absorption for mid-infrared light are required, such as zinc selenide (1-14μm), barium fluoride (200-11μm) or germanium (2-10μm).

[0051] In some embodiments, an anti-reflection film matching the laser beams of different wavebands is further coated on the substrate of the reflective neutral density filter wheel; and a scale mark for indicating the optical density value is arranged on the reflective neutral density filter wheel.

[0052] In the present embodiment, the anti-reflection film reduces the reflection loss of light at the interface, thereby increasing the transmittance of light. By setting the anti-reflection film according to the required matching laser beam waveband, the optimal transmittance effect in a specific wavelength range can be ensured.

[0053] Further, the reflective neutral density filter wheel is provided with scale marks, so that the user can quickly and accurately find the required optical density value during use. In this way, the user can determine the optical density value of the selected filter by rotating the filter wheel and observing the scale marks, thereby improving the user's work efficiency and avoiding misoperation.

[0054] Referring to Figure 1 and Figure 3 As shown in FIGS. 1, 2 and 3, in some embodiments, the laser light guide arm 100 further comprises a laser handpiece 30 which is docked at the exit end of the main light guide barrel 10; the laser handpiece 30 is provided with a laser shaping lens and a lens barrel which is slidingly arranged at the output end of the laser handpiece 30, and the lens barrel is provided with a lens.

[0055] In this embodiment, after the laser beam is guided by the laser light guide arm 100, it can be further shaped and processed by the laser handpiece 30.

[0056] The laser shaping lens can be a beam diffraction lens which shapes the laser beam by diffraction principle, and has the characteristics of small size, light weight, easy replication and realization of arbitrary wavefront transformation. By designing different diffraction patterns or structures, the intensity distribution, shape and direction of the laser beam can be changed. The lens barrel is slidingly arranged at the output end of the laser handpiece 30, and is used to accommodate and support the lens. The lens is used to further focus and diverge the light, and by sliding the lens barrel, the distance between the lens and the laser beam can be adjusted, thereby changing the focusing state of the laser beam.

[0057] Specifically, when the lens barrel slides, the focal point of the laser beam passing through the lens in the lens barrel also moves, thereby changing the spot size of the laser beam on the target position. Therefore, by accurately controlling the sliding distance of the lens barrel, the size of the spot can be accurately adjusted.

[0058] The above only describes some or preferred embodiments of the present application, neither the text nor the drawings can limit the scope of protection of the present application, any equivalent structural transformation based on the content of the present application and the drawings, or direct / indirect application in other related technical fields is included in the scope of protection of the present application.

Claims

1. A laser light guide arm, characterized in that, include: A dominant optical tube, including an incident end and an exit end, is used for the transmission of a laser beam from the incident end to the exit end; A beam calibration assembly includes a light guide mounting component and, within the light guide mounting component, an aperture stop, a first reflector, a polarizer, a quarter-wave plate, and a reflective neutral density filter wheel, arranged sequentially along the optical path. The light guide mounting component is concentrically connected to the incident end of the main beam tube. The aperture stop is arranged close to the light inlet of the light guide mounting component, and the first reflector is adjustablely positioned at a corner of the light guide mounting component to correct the transmission path of the laser beam. The polarizer transmits the laser beam, which is adjusted and reflected by the first reflector, to the quarter-wave plate and the reflective neutral density filter wheel. After the polarization state of the laser is converted by the quarter-wave plate, based on the transmittance setting of the reflective neutral density filter wheel, a portion of the laser beam is transmitted into the main beam tube for transmission, and another portion of the laser beam is reflected back to the polarizer along the original path. Furthermore, the light guide mounting component is provided with a color calibration card in the direction of the polarizer's reflection of the laser beam, and the laser beam reflected by the polarizer is displayed on the color calibration card.

2. The laser light guide arm according to claim 1, characterized in that, The light guide mounting component includes a first "L"-shaped light guide tube, a sleeve, and a second "L"-shaped light guide tube. One end of the first "L"-shaped light guide tube is connected to the second "L"-shaped light guide tube through the sleeve, and the other end of the second "L"-shaped light guide tube is connected to the main light guide tube. The first "L"-shaped light guide tube and the sleeve, the second "L"-shaped light guide tube and the sleeve, and the second "L"-shaped light guide tube and the main light guide tube are all rotatably connected.

3. The laser light guide arm according to claim 2, characterized in that, The aperture stop is positioned close to the light inlet of the first "L"-shaped light guide tube; the first reflector is positioned at the corner of the first "L"-shaped light guide tube; the polarizer and the color calibration card are positioned on the sleeve; and the quarter-wave plate and the reflective neutral density filter wheel are positioned at the tail end of the second "L"-shaped light guide tube near the main light guide tube. The second "L"-shaped light guide tube has a second reflector at its corner, which is used to reflect the laser beam transmitted by the polarizer to the quarter-wave plate.

4. The laser guide arm according to claim 3, characterized in that, The aperture size of the aperture stop is adjustable.

5. The laser guide arm according to claim 1, characterized in that, A shielding plate is disposed between the colorimetric calibration card and the polarizer. The shielding plate can block the transmission of the laser beam reflected by the polarizer to the colorimetric calibration card; or, The shielding plate can be removed between the polarizer and the color calibration card to allow the transmission of the laser beam reflected by the polarizer to the color calibration card.

6. The laser light guide arm according to claim 1, characterized in that, The polarizer and the substrate material of the reflective neutral density filter wheel are matched with laser beams of different wavelengths; and the reflective neutral density filter wheel has a gradient film of corresponding thickness coated on it based on different substrate materials.

7. The laser light guide arm according to claim 6, characterized in that, The substrate material is one of B270 glass, calcium fluoride, barium fluoride, and zinc selenide.

8. The laser light guide arm according to claim 6, characterized in that, The substrate of the reflective neutral density filter wheel is also coated with an antireflection film that matches laser beams of different wavelengths; and the reflective neutral density filter wheel is provided with scale markings for indicating optical density values.

9. The laser beam guide arm according to claim 1, characterized in that, The main light guide tube includes at least two sub-light guide tubes, and a rotating joint is provided between adjacent sub-light guide tubes.

10. The laser beam guide arm according to claim 1, characterized in that, It also includes a laser handpiece disposed at the output end of the main laser tube; the laser handpiece is provided with a laser shaping lens and a lens barrel slidably disposed at the output end of the laser handpiece, and the lens barrel is provided with a lens.

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