Laser guide arm

Abstract

The invention discloses a laser guide arm. The laser light guide arm comprises a main light guide cylinder and a light beam calibration assembly. The main light guide cylinder comprises an incident end and an emergent end and is used for transmitting a laser beam from the incident end to the emergent end; the light beam calibration assembly comprises a light guide mounting part, and an aperture diaphragm, a first reflector, a polaroid, a 1 / 4 wave plate and a reflective neutral density filter wheel which are sequentially arranged in the light guide mounting part along a light path; the light guide mounting part is butted with the incident end of the main light guide cylinder; and the light guide mounting piece is provided with a color development calibration card in the reflection direction of the polarizing film to the laser beam, so that the laser spot reflected by the polarizing film is displayed on the color development calibration card. According to the scheme, the laser beam enters the main light guide cylinder to be transmitted after passing through the light beam calibration assembly, in the light beam calibration assembly, the effect of accurately calibrating the laser light path can be achieved by adjusting the first reflecting mirror and obtaining the laser spot position feedback displayed on the color development calibration card in real time, and the device is particularly suitable for rapid calibration of invisible light.

Description

Technical Field

[0001] The present application relates to the field of laser processing technology, and in particular to a laser light guide arm. Background Art

[0002] Laser light guide arms are devices that accurately guide lasers to the processing position, ensuring stable transmission and precise positioning of lasers. Laser light guide arms are divided into two types: reflective light guide arms and fiber-optic transmission light guide arms.

[0003] Among them, the reflective light guide arm is often composed of multiple light guide tubes, reflectors and lenses, which can increase the flexibility and functionality of the light guide arm, but the increase in optical path and optical elements also creates more stringent requirements on the angle of the incident light beam. In actual applications, the existing reflective light guide arm needs to be repeatedly adjusted back and forth during use to ensure normal light guidance due to the lack of a calibration mechanism, which has a certain degree of blindness, especially for invisible infrared light, where precise coupling and efficient light guidance are more difficult to achieve. Summary of the invention

[0004] The present application provides a laser light guide arm, aiming to solve the problem in the prior art that the laser light path cannot be calibrated quickly and accurately.

[0005] To achieve the above objectives, the present application proposes a laser light guide arm. The laser light guide arm comprises:

[0006] A main light guide tube, comprising an incident end and an output end, used for transmitting a laser beam from the incident end to the output end;

[0007] A beam calibration component, comprising a light guide mounting part, and an aperture diaphragm, a first reflector, a polarizer, a quarter wave plate, and a reflective neutral density filter wheel, which are sequentially arranged along the optical path in the light guide mounting part; the light guide mounting part is arranged to be docked with the incident end of the main light guide tube; the aperture diaphragm is arranged close to the light entrance of the light guide mounting part, and the first reflector can be adjusted at the corner of the light guide mounting part to correct the transmission optical path of the laser beam; the polarizer is used to transmit the laser beam adjusted and reflected by the first reflector and transmit it to the quarter wave plate and the reflective neutral density filter wheel, so that after the polarization state of the laser beam is converted by the quarter wave plate, and based on the transmittance setting of the reflective neutral density filter wheel, part of the laser beam is transmitted into the main light guide tube for transmission and another part of the laser beam is reflected to the polarizer along the original path;

[0008] Furthermore, the light guide mounting member is provided with a color calibration card in the reflection direction of the laser beam by the polarizing plate, and the laser beam reflected by the polarizing plate is displayed on the color calibration card.

[0009] In some embodiments, the light guide mounting member 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;

[0010] Wherein, 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 rotationally connected.

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

[0012] Wherein, a second reflector is arranged at the corner of the second "L"-shaped light guide tube, and the second reflector 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 sheet is provided between the color calibration card and the polarizing sheet, and the shielding sheet can be shielded between the polarizing sheet and the color calibration card to block the transmission of the laser beam reflected by the polarizing sheet to the color calibration card; or,

[0015] The shielding sheet may be withdrawn from between the polarizing sheet and the color calibration card to allow the laser beam reflected by the polarizing sheet to be transmitted to the color calibration card.

[0016] In some embodiments, the substrate materials of the polarizer and the reflective neutral density filter wheel match laser beams of different wavelength bands; and the reflective neutral density filter wheel is coated with a gradient film of corresponding thickness based on the 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, the substrate of the reflective neutral density filter wheel is also coated with an anti-reflection film that matches laser beams of different wavelength bands; and the reflective neutral density filter wheel is provided with a scale mark for indicating the optical density value.

[0019] In some embodiments, the main light guide tube includes at least two sub-light guide tubes, and a rotation joint is provided between adjacent sub-light guide tubes.

[0020] In some embodiments, it also includes a laser handpiece docked at the output end of the main light tube; the laser handpiece is provided with a laser shaping lens and a lens barrel slidably arranged at the output end of the laser handpiece, and a lens is arranged in the lens barrel.

[0021] The technical solution of the present application proposes a laser light guide arm. The laser light guide arm includes a main light guide tube and a light beam calibration assembly. The main light guide tube includes an incident end and an output end, and is used for transmitting the laser beam from the incident end to the output end; the light beam calibration assembly includes a light guide mounting part and an aperture stop, a first reflector, a polarizer, a quarter wave plate and a reflective neutral density filter wheel arranged in sequence along the light path in the light guide mounting part; and the light guide mounting part is provided with a color calibration card in the reflection direction of the polarizer to the laser beam, and the laser beam reflected by the polarizer is displayed on the color calibration card. In the technical solution of the present application, the laser beam enters the main light guide tube for transmission after passing through the light beam calibration assembly. Among them, the laser beam is transmitted to the radiation filter wheel after passing through the aperture diaphragm, the first reflector, the polarizer and the quarter wave plate in the beam calibration assembly in sequence. Based on the transmittance setting of the reflective neutral density filter wheel, part of the laser beam is transmitted as the working laser beam and enters the main light tube for further transmission, while the other part of the laser beam is reflected by the reflective neutral density filter wheel as the calibration laser beam. The reflected laser beam is further reflected by the polarizer to the color calibration card for spot display, so that by observing the position of the laser spot displayed on the color calibration card and whether the diffraction pattern is centrally symmetrical, it can be judged whether the laser light path is collimated. If it is not collimated, the first reflector can be adjusted for calibration. Therefore, the present application can obtain the position feedback of the laser spot displayed on the color calibration card in real time by adjusting the first reflector, so as to achieve the effect of accurately calibrating the laser light path, and achieve the effect of accurately calibrating the laser light path, which is particularly suitable for fast calibration of invisible light. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0023] Figure 1 This is a schematic structural diagram of a laser light guide arm according to an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the structure of a beam calibration component in one embodiment of the present application;

[0025] Figure 3 Schematic diagram of the structure of a laser hand tool in one embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

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

[0028] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0029] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0030] See also Figure 1 as well as Figure 2As shown, the present application proposes a laser light guide arm 100. The laser light guide arm 100 includes a main light guide tube 10 and a light beam calibration assembly 20. The main light guide tube 10 is the main channel for laser beam transmission, including an incident end and an output end, and is used for the transmission of the laser beam from the incident end to the output end; wherein, the main light guide tube 10 includes at least two sub-light guide tubes, and a rotating joint is provided between adjacent sub-light guide tubes, which can allow relative rotation between adjacent sub-light guide tubes, thereby flexibly adjusting the transmission direction of light to adapt to different application scenarios and layout requirements. The light beam calibration assembly 20 is docked at the incident end of the main light guide tube 10, so that the laser light path can be calibrated based on the light beam calibration assembly 20 before the laser beam enters the main light guide tube 10 for transmission, to ensure that the laser beam remains in the best state during the transmission process.

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

[0032] First, the aperture diaphragm 22 is arranged close to the light entrance of the light guide mounting part 21, and the laser beam passes through the center of the aperture diaphragm 22 and is incident on the first reflector 23. Then, the laser beam reflected by the first reflector 23 is transmitted through the polarizer 24, and continues to be transmitted 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 is transmitted as a working laser beam and enters the main light tube 10 for transmission, and another part of the laser beam is reflected by the original path to the polarizer 24 as a calibration laser beam, and then reflected by the polarizer 24 to the color calibration card 27 for spot display.

[0033] The principle of achieving rapid beam calibration is as follows: because the polarization direction of the laser beam reflected by the first reflector 23 is consistent with the transmission direction of the polarizer 24, the laser beam can smoothly pass through the polarizer 24 and be transmitted to the 1 / 4 wave plate 25, and the polarization state of the laser beam is rotated 45° at the 1 / 4 wave plate 25 before being 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 laser beam is irradiated on the reflective neutral density filter wheel 26, part of the laser beam will be reflected and the other part will pass through. In this case, the laser beam transmitted into the main light tube 10 can be used as a working laser beam, and the reflected laser beam can be used as a calibration laser beam. The calibration laser beam will be reflected from the original path and pass through the 1 / 4 wave plate 25 again, and the polarization state will be rotated 45° again, so that the polarization directions of the calibration laser beam and the original incident laser beam are perpendicular to each other. Further, when the calibration laser beam is transmitted to the polarizer 24, it is reflected by the polarizer 24 onto the color calibration card 27. The color calibration card 27 is made of heat-sensitive material. When the laser beam hits the color calibration card 27, the color of the position of the color calibration card 27 corresponding to the laser spot will change, which is helpful for the operator to intuitively obtain the distribution of the laser spot, so as to judge whether the laser light path is collimated. For the transmission of invisible light, it is also possible to judge whether the light path is collimated based on the display status of the laser spot on the color calibration card 27, which has strong adaptability.

[0034] It can be understood that the color calibration card 27 is precisely fixed, and a "cross" is set on the color calibration card 27 as a position reference. When the spot of the calibration laser beam on the color calibration card 27 coincides with the intersection of the "cross" and the diffraction pattern generated by the laser beam passing through the aperture diaphragm 22 is centrally symmetrical, it can be considered that the laser beam is transmitted according to the predetermined optical path and is in a collimated state; otherwise, it is considered that the laser optical path needs to be calibrated; the calibration process includes: adjusting the first reflector 23, and based on the adjustment of the first reflector 23, observing the position of the laser spot displayed on the color calibration card 27 in real time until the laser spot coincides with the intersection of the "cross".

[0035] It is worth noting that the present application assumes that when the laser beam is incident, the center of the laser beam is coaxial with the center of the aperture stop 22, so when the spot of the calibration laser beam is adjusted to be located at the intersection of the "cross" wires, its diffraction pattern should be in a centrally symmetrical state. If the spot of the calibration laser beam is located at the intersection of the "cross" wires, but its diffraction pattern is not centrally symmetrical, it indicates that the laser beam is not incident at the center when it passes through the aperture stop 22. At this time, it is necessary to adjust components other than the laser light guide arm 100, such as the setting of the laser connected to the other end of the beam calibration component 20, to cooperate with the adjustment of the first reflector 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, which is convenient for installation and optical path adjustment. Among them, 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 selected from a nickel-iron alloy with a small thermal expansion coefficient. When the temperature changes, the size of the support member changes less, which can ensure the stability of the angle of the first reflector 23 thereon. The adjustment mechanism can be a screw-nut mechanism, so as to achieve a small adjustment amount and ensure the adjustment accuracy of the lens angle of the first reflector 23. Exemplarily, the rotation angle and pitch angle of the first reflector 23 can be adjusted by the screw-nut mechanism.

[0037] It is also worth noting that, because the technical solution of the present application adopts a reflective neutral density filter wheel 26 to form a working laser beam and a calibration laser beam, the power of the working laser beam can be adjusted by rotating the reflective neutral density filter wheel 26, so that the traditional power adjustment from the source of the laser beam is not required, and the operation is convenient; on the other hand, based on the law of conservation of energy, when the power of the working laser beam increases, the power of the calibration laser beam is relatively small, so that the power of the calibration laser beam reflected on the color calibration card 27 can also be adjusted.

[0038] Specifically, when the optical path is being calibrated, the calibration laser beam can be adjusted to have a lower power so that it can display a light spot on the color calibration card 27 and prevent the color calibration card 27 from being burned due to excessive power. When the calibration is completed and the formal laser beam operation is carried out, the power of the working laser beam can be adjusted accordingly.

[0039] In order to further enhance safety protection, a shielding sheet (not shown in the drawings) is provided between the color calibration card 27 and the polarizing plate 24. The shielding sheet can be shielded between the polarizing plate 24 and the color calibration card 27 to block the transmission of the laser beam reflected by the polarizing plate 24 to the color calibration card 27; or, the shielding sheet can be withdrawn from between the polarizing plate 24 and the color calibration card 27 to open the transmission of the laser beam reflected by the polarizing plate 24 to the color calibration card 27. That is, the shielding sheet is used to control the on-off transmission of the calibration laser beam between the polarizing plate 24 and the color calibration card 27. In this way, in the actual operation process, if the calibration laser beam reflected by the reflective neutral density filter wheel 26 has a high power, the shielding sheet can be controlled to shield between the polarizing plate 24 and the color calibration card 27, thereby effectively preventing the laser beam from burning the color calibration card 27.

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

[0041] In this embodiment, a specific structural setting of the light guide mounting member 21 is proposed. The shape of the "L"-shaped light guide tube and the design of multiple rotation connection 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] Exemplarily, a setting structure of each optical element in the light guide mounting part 21 is: the aperture diaphragm 22 is arranged near the light entrance of the first "L"-shaped light guide tube 211, and the first reflector 23 is arranged at the corner of the first "L"-shaped light guide tube 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 on the tail end of the second "L"-shaped light guide tube 213 near the main light guide tube 10; wherein, a second reflector 28 is arranged at the corner of the second "L"-shaped light guide tube 213, and the second reflector 28 is used to reflect the laser beam transmitted by the polarizer 24 to the 1 / 4 wave plate 25.

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

[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 component 20 can be controlled.

[0045] Among them, a conventional adjustment method of the aperture diaphragm 22 is: the aperture diaphragm 22 is composed of multiple movable diaphragm blades, which rotate around the central axis, and can be further provided with structural parts such as adjustment knobs (such as diaphragm fixing rings and diaphragm rotating rings) to change the overlap between multiple diaphragm blades by rotating the knobs, thereby adjusting the aperture size of the diaphragm. Through reasonable layout and application of optical principles such as reflection and transmission, effective guidance and precise processing of light are achieved.

[0046] In some embodiments, the substrate materials of the polarizer 24 and the reflective neutral density filter wheel 26 match the laser beams of different wavelength bands; and the reflective neutral density filter wheel 26 has a gradient film of corresponding thickness coated thereon based on different substrate materials.

[0047] It can be understood that the laser light guide arm 100 provided by the technical solution of the present application is suitable for optical path calibration of multi-band lasers. In this embodiment, by setting the substrate materials of the polarizer 24 and the reflective neutral density filter wheel 26 that match the lasers of different wavelengths, the optimal filtering and polarization effects of the lasers of different wavelengths can be achieved, thereby ensuring the efficiency and stability of the laser beam system.

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

[0049] Exemplarily, common wavelength bands of lasers include visible wavelength band, near infrared wavelength band and mid-infrared wavelength band.

[0050] Among them, for laser beams in the visible light band, substrate materials with high transparency and good optical properties are usually used, such as K9 glass or B270 glass (350-2000nm). For laser beams in the near-infrared band, 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 in the mid-infrared band, materials with high transmittance and low absorption of mid-infrared light are required, such as zinc selenide (1-14μm), barium fluoride (200-11μm) or germanium (2-10μm).

[0051] In some embodiments, the substrate of the reflective neutral density filter wheel is further coated with an anti-reflection film that matches laser beams of different wavelength bands; and the reflective neutral density filter wheel is provided with a scale mark for indicating the optical density value.

[0052] In this embodiment, the function of the anti-reflection film is to reduce the reflection loss of light on the interface, thereby increasing the transmittance of light. The anti-reflection film is set according to the required matching laser beam band to ensure the best transmission effect within a specific wavelength range.

[0053] Further setting scale marks on the reflective neutral density filter wheel can facilitate users to quickly and accurately find the required optical density value during use. In this way, when using the filter wheel, the user can determine the optical density value of the currently selected filter by rotating the filter wheel and observing the scale marks, thereby improving the user's work efficiency and avoiding misoperation.

[0054] See also Figure 1 as well as Figure 3 As shown, in some embodiments, the laser light guide arm 100 also includes a laser handpiece 30 docked at the output end of the main light guide tube 10; the laser handpiece 30 is provided with a laser shaping lens and a lens barrel slidably arranged at the output end of the laser handpiece 30, and a lens is arranged in the lens barrel.

[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 hand tool 30 .

[0056] Among them, the laser shaping lens can be a beam diffraction lens that uses the diffraction principle to shape the laser beam, and has the characteristics of small size, light weight, easy replication, and the ability to achieve wavefront transformation of any shape. By designing different diffraction patterns or structures, the intensity distribution, shape and direction of the laser beam can be changed. The lens barrel is slidably arranged at the output end of the laser handpiece 30 to accommodate and support the lens, which is used to further focus and diverge the light. 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 its inner lens also moves, thereby changing the spot size of the laser beam at the target position. Therefore, by accurately controlling the sliding distance of the lens barrel, the spot size can be accurately adjusted.

[0058] The above description is only a partial or preferred embodiment of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A laser light guide arm, characterized in that: include: A main light guide tube, comprising an incident end and an output end, used for transmitting a laser beam from the incident end to the output end; A beam calibration component, comprising a light guide mounting part, and an aperture diaphragm, a first reflector, a polarizer, a quarter wave plate and a reflective neutral density filter wheel arranged in sequence along the optical path in the light guide mounting part; the light guide mounting part is arranged to be docked with the incident end of the main light guide tube; the aperture diaphragm is arranged close to the light entrance of the light guide mounting part, and the first reflector can be adjusted at the corner of the light guide mounting part to correct the transmission optical path of the laser beam; the polarizer is used to transmit the laser beam adjusted and reflected by the first reflector and transmit it to the quarter wave plate and the reflective neutral density filter wheel, so that 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, part of the laser beam is transmitted into the main light guide tube for transmission and another part of the laser beam is reflected to the polarizer along the original path; Furthermore, the light guide mounting member is provided with a color calibration card in the reflection direction of the laser beam by the polarizing plate, and the laser beam reflected by the polarizing plate is displayed on the color calibration card.

2. The laser light guide arm according to claim 1, characterized in that: The light guide mounting member 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; Among them, 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 rotationally connected.

3. The laser light guide arm according to claim 2, characterized in that: The aperture diaphragm is arranged close to the light entrance of the first "L"-shaped light guide tube, the first reflector 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 at the tail end of the second "L"-shaped light guide tube close to the main light guide tube; Wherein, a second reflector is arranged at the corner of the second "L"-shaped light guide tube, and the second reflector is used to reflect the laser beam transmitted by the polarizer to the 1 / 4 wave plate.

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

5. The laser light guide arm according to claim 1, characterized in that: A shielding sheet is provided between the color calibration card and the polarizing sheet, and the shielding sheet can be blocked between the polarizing sheet and the color calibration card to block the laser beam reflected by the polarizing sheet from being transmitted to the color calibration card; or, The shielding sheet may be withdrawn from between the polarizing sheet and the color calibration card to allow the laser beam reflected by the polarizing sheet to be transmitted to the color calibration card.

6. The laser light guide arm according to claim 1, characterized in that: The substrate materials of the polarizer and the reflective neutral density filter wheel match laser beams of different wavelength bands; and a gradient film of corresponding thickness is coated on the reflective neutral density filter wheel 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 anti-reflection film that matches laser beams of different wavelength bands; and the reflective neutral density filter wheel is provided with a scale mark for indicating the optical density value.

9. The laser light guide arm according to claim 1, characterized in that: 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.

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

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