Laser burning device

Abstract

The present invention discloses a laser burning device, which is characterized by comprising a laser emission module 1, a dirt-sealing mirror assembly 2 and a burnt object positioning mechanism 3. The laser emitted by the laser emission module 1 is irradiated on the burnt object through the dirt-sealing mirror assembly 2; the dirt-sealing mirror assembly 2 is located on the optical path of the device, and its center is more than 4 mm away from the optical waist of the device, and its light hole radius is less than 10 mm; the burnt object positioning mechanism 3 is used to place the burnt object and ensure that the burnt part of the burnt object is located within the range of plus or minus 2 mm of the optical waist of the device. Due to the effect of the dirt-sealing mirror and the closed structure, the floating objects after burning cannot adhere to the components on the optical path of the entire device, thereby not affecting the quality of the laser beam.

Description

Technical Field

[0001] The invention relates to a laser device, in particular to a laser burning device. Background Art

[0002] Laser liquid sample collection equipment is a medical device that uses a laser transmitter to emit a laser beam in a very short time, instantly generating high temperature on the skin tissue, burning and vaporizing a microhole, thereby achieving the purpose of collecting liquid samples.

[0003] Existing portable laser liquid sample collection equipment often requires consumables such as laser protective caps to avoid carrying contamination and lens dirtiness, but this increases the cost of collecting a single liquid sample. In addition, the laser protective cap needs to be installed when collecting liquid samples. After laser burning is completed, the liquid sample may be contaminated on the laser protective cap. Therefore, it needs to be treated as medical waste, which is still not convenient to use. Summary of the invention

[0004] In order to solve at least one of the above technical problems, an object of an embodiment of the present invention is to provide a laser ablation device.

[0005] In order to achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] A laser cauterization device,

[0007] The invention is characterized in that it comprises a laser emission module, a dirt-sealing mirror assembly and a burnt object positioning mechanism.

[0008] The laser emitted by the laser emission module is irradiated onto the object to be burned through the pollution-proof mirror assembly;

[0009] The dirt-sealing mirror assembly is located on the optical path of the device, with its center being more than 4 mm away from the optical waist of the device, and its light aperture radius being less than 10 mm;

[0010] The burnt object positioning mechanism is used to place the burnt object and ensure that the burnt part of the burnt object is located within the range of plus or minus 2 mm of the light waist of the device.

[0011] Due to the effect of the pollution-sealing mirror and the closed structure, the floating objects after burning cannot adhere to the components on the optical path of the entire device, thus not affecting the quality of the laser beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the simplified structure of a laser burning device provided in an embodiment of the present invention;

[0013] Figure 2 is a schematic diagram of a laser optical device provided by an embodiment of the present invention;

[0014] Figure 3 It is a front view and a side view of a closed optical path adjustment mechanism provided by an embodiment of the present invention;

[0015] Figure 4 1 is a three-dimensional diagram and a cross-sectional diagram of a semi-open cavity structure provided by an embodiment of the present invention;

[0016] Figure 5 is a three-dimensional perspective view of an optical path adjustment mechanism provided by an embodiment of the present invention;

[0017] Figure 6 is a stereoscopic diagram of an open state of the optical path adjustment mechanism provided by an embodiment of the present invention;

[0018] Figure 7 is a three-dimensional diagram of a closed state of the optical path adjustment mechanism provided by an embodiment of the present invention;

[0019] Figure 8 is a longitudinal cross-sectional view of an optical path adjustment mechanism provided by an embodiment of the present invention;

[0020] Fig. 9 is a transverse cross-sectional view of an optical path adjustment mechanism provided by an embodiment of the present invention;

[0021] Fig.10 It is a schematic diagram of the distribution of main components of the optical path provided by an embodiment of the present invention.

[0022] The following are marked in the figure:

[0023] 1-Laser emission module; 2-Pollution sealing mirror assembly; 3-Burned object positioning mechanism;

[0024] 4-upper main shell; 5-lower main shell; 6-upper fastener; 7-lower fastener;

[0025] 8-light outlet of the pollution-sealing mirror; 9-light-through hole in which the pollution-sealing mirror assembly is embedded;

[0026] 10-a semi-open cavity formed by a closed structure between the light-through hole in which the dirt-sealing mirror assembly is embedded and the burned part of the burned object;

[0027] 11- The dirt-sealing lens on the dirt-sealing lens assembly;

[0028] 12- threaded structure on the inner wall of the semi-open cavity;

[0029] 13- The burning object limiting structure on the burning object positioning mechanism;

[0030] 14-right adjustment lever; 15-left adjustment lever;

[0031] 16-main housing positioning structure in the main housing;

[0032] 17-Level adjustment and positioning structure on the displacement adjustment rod;

[0033] 18-ball-shaped set screw; 19-groove matching with ball-shaped set screw 18;

[0034] 20- beam reducing mirror assembly. DETAILED DESCRIPTION

[0035] The laser liquid sample collection device is a medical device that uses a laser transmitter to emit a laser beam with a wavelength of 2.94μm in a very short time, instantly generating high temperature on the skin tissue, burning and vaporizing a microhole, thereby achieving the purpose of collecting liquid samples.

[0036] Existing portable laser liquid sample collection equipment must use a laser protective cap because the burnt products generated during liquid sample collection will contaminate and damage various devices in the laser optical path, including lenses, resonant cavities, etc., which will eventually cause the laser light-emitting device to fail. The laser protective cap can partially isolate pollutants.

[0037] Although the laser protective cap in the existing portable laser liquid sample collection equipment has an anti-pollution function, it increases the cost of collecting a single liquid sample. In addition, the laser protective cap needs to be installed when collecting liquid samples. After the laser burning is completed, the liquid sample may be contaminated on the laser protective cap. Therefore, it needs to be treated as medical waste, which is not convenient to use.

[0038] The basic concept of the present invention is to utilize a closed structure to prevent floating pollutants from contaminating various devices on the laser optical path, and to utilize other methods to reduce the amount of floating pollutants attached to the contamination-sealing mirror, thereby achieving the purpose of eliminating the laser protective cap while ensuring that various devices on the laser optical path are not contaminated.

[0039] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0040] like Figure 1 As shown, the present invention is a laser burning device.

[0041] The invention is characterized in that it comprises a laser emission module 1, a dirt sealing mirror assembly 2 and a burnt object positioning mechanism 3.

[0042] like Figure 2 As shown, the laser emitted by the laser emitting module 1 is irradiated onto the object to be burned through the dirt-sealing mirror assembly 2;

[0043] The dirt-sealing mirror assembly 2 is located on the optical path of the device, with its center being more than 4 mm away from the optical waist of the device, and its light aperture radius being less than 10 mm;

[0044] This design is adopted because, in windless conditions, as long as the distance between the burning site and the optical device on the optical path exceeds a certain length, the burnt material will often not adhere to the surface of the sealing mirror and will not affect the use of the entire laser device.

[0045] Moreover, more than 99% of the skin is carbohydrates, and there is basically no residue after burning. The vaporized floating matter has a certain probability of vaporizing into smaller particles during the laser burning process. Even if it temporarily adheres to the surface of the sealing mirror, there is a certain probability that it will be vaporized again and float to other places, and will no longer affect the use of the entire laser device.

[0046] Through our extensive burning experiments on pig skin, we confirmed that the vaporized burnt material only floats and adheres to a small area.

[0047] The specific experimental design is as follows.

[0048] Here we divide the energy into 5 levels, conduct 3000 pig skin burning experiments in each level, and conduct the experiments in 5 identical devices respectively, for a total of 5*5*3000=75000 burning experiments.

[0049] In the absence of wind and the most serious pollution situation, the average laser energy at the burned part only changed from 180mJ to 178mJ, and the light intensity only dropped by 1.11%, which basically had no effect on the burning.

[0050] Therefore, we determined that when the center of the light hole of the contamination-sealing mirror is more than 4 mm away from the light waist of the device, the floating objects after burning will basically not affect the laser burning.

[0051] Therefore, when the dirt-sealing mirror assembly 2 is far enough away from the burning point of the object to be burned and the radius of the light hole of the dirt-sealing mirror assembly 2 is small enough, the vaporized burnt material will basically not contaminate or damage various devices in the laser optical path, including lenses, resonant cavities, etc., thereby ensuring the reliability of the laser burning device.

[0052] The radius of the light hole of the dirt-sealing mirror assembly 2 is less than 10 mm. This is because the light hole of the dirt-sealing mirror assembly 2 is surrounded by a closed structure. If any floating objects fall on the closed structure, it will not affect the use of the optical device. The radius of the light hole should be as small as possible, so that the probability of floating objects falling on the light hole is relatively small. Even if they fall on the light hole, the impact will be small due to the limited area.

[0053] The burnt object positioning mechanism 3 is used to place the burnt object and ensure that the burnt part of the burnt object is located within the range of plus or minus 2 mm of the light waist of the device.

[0054] The burnt object positioning mechanism 3 places the burnt object on the optical path within a certain focal depth range, so that the burnt object can be effectively burnt and vaporized, and the burnt object can be placed flexibly and freely within the focal depth range of the optical path of the device, and has a high liquid sample collection success rate within 1.5 times the focal depth.

[0055] Furthermore, as a specific embodiment of the laser burning device provided by the present invention, the lens surface focal length of the pollution-sealing mirror assembly 2 of the laser burning device is less than 0.1, and is coated with a laser anti-reflection film layer, and the anti-reflection band of the anti-reflection film layer is 2940+ / -100nm.

[0056] The focal length of the lens surface of the dirt-sealing mirror assembly 2 is less than 0.1, which means that the lens is a plane, which will not affect the original design of the optical path of the device, and mainly plays a role in reducing the impact of pollutants on the optical device.

[0057] The laser emission module of the laser liquid sample collection device generally emits a laser band of 2.94μm, so the anti-reflection band of its anti-reflection film layer is 2940+ / -100nm. The method of coating with a laser anti-reflection film layer reduces the laser energy loss, so that the laser energy can be utilized to the maximum extent and can burn and vaporize micropores, so as to achieve the purpose of burning holes and facilitating liquid sample collection.

[0058] The laser anti-reflection film layer is also an anti-fouling layer, and the coating process is vacuum deposition. The anti-fouling layer makes it more difficult for floating pollutants to be contaminated on the lens surface of the contamination-sealing mirror assembly 2, so as not to affect the use of the laser device. Compared with traditional coating technology, the vacuum deposition coating process can obtain a high-density, high-bonding coating and can be processed at low temperature, so as not to affect the substrate performance of the parts.

[0059] Furthermore, if Figure 3 As shown, as a specific embodiment of the laser burning device provided by the present invention, the laser burning device,

[0060] The main housing is further comprised of an upper main housing 4 and a lower main housing 5. The upper main housing 4 and the lower main housing 5 are tightly fastened. The laser emission module 1 and the dirt-sealing mirror assembly 2 are fixed inside the main housing.

[0061] It is characterized in that the main shell also includes an upper fastener 6 and a lower fastener 7, which are locked with the upper main shell 4 and the lower main shell 5 respectively, and the upper fastener 6 and the lower fastener 7 have openings and a light outlet 8 for the sealing mirror that fit with the burnt object positioning mechanism 3 at the front end. The opening that fits with the burnt object positioning mechanism 3 is an opening of the size of the cross-section of the burnt object positioning mechanism 3, and the center of the opening is the light outlet 8 for the sealing mirror, and a light through hole 9 of the sealing mirror assembly 2 is embedded.

[0062] In this way, the fastener and the main shell form a two-layer closed structure, which further ensures the sealing of the optical device part of the overall structure, so that floating pollutants cannot pollute the internal light path.

[0063] Furthermore, if Figure 4 As shown, as a specific embodiment of the laser burning device provided by the present invention, the laser burning device,

[0064] It is characterized in that

[0065] A semi-open cavity 10 is formed by a closed structure between the light-through hole 9 of the dirt-sealing mirror assembly 2 and the burned part of the object to be burned. One end of the light-through hole is closed by a dirt-sealing lens 11 on the dirt-sealing mirror assembly 2. The inner wall of the semi-open cavity 10 is a threaded structure 12 or an annular toothed structure.

[0066] This design idea is similar to a labyrinth seal. A labyrinth seal generally has several annular sealing teeth arranged in sequence around the rotating shaft, and a series of intercepting gaps and expansion cavities are formed between the teeth. When the sealed medium passes through the gaps of the tortuous labyrinth, a throttling effect is generated to achieve the purpose of preventing leakage.

[0067] The inner wall of the semi-open cavity 10 is a threaded structure 12 or an annular toothed structure, which is equivalent to a half labyrinth seal structure, that is, there are no rotating parts here, and the fixed parts are equivalent to many tortuous chambers, and the friction effect, flow contraction effect and air permeability effect similar to the labyrinth seal structure will prevent floating pollutants from entering the semi-open cavity 10, thereby achieving the purpose of reducing floating pollutants.

[0068] Furthermore, if Figure 5 As shown, as a specific embodiment of the laser burning device provided by the present invention, the laser burning device is characterized in that:

[0069] The object-to-be-burned positioning mechanism 3 can be pulled out of or pushed back into the main housing.

[0070] The burnt object positioning mechanism 3 can be pulled out or pushed back from the main housing. During burning, the burnt object positioning mechanism 3 can be farther away from the dirt sealing mirror assembly 2, thereby making it more difficult for contaminants to fall on the optical device and reducing the impact of contaminants.

[0071] Furthermore, as a specific embodiment of the laser burning device provided by the present invention, the laser burning device,

[0072] It is characterized in that

[0073] The burnt object positioning mechanism 3 includes more than one displacement adjustment rod, and the light emitting direction of the device is parallel to the displacement direction of the displacement adjustment rod;

[0074] The displacement adjustment rod includes a burnt object limiting structure 13 for limiting the placement position of the burnt object. When the displacement adjustment rod is pulled out from the main housing, the distance between the center point of the burnt object limiting structure 13 on the displacement adjustment rod and the light outlet of the laser emitting module 1 is greater than 10 mm.

[0075] The displacement adjustment rod (the figure includes two adjustment rods, including a right adjustment rod 14 and a left adjustment rod 15), and the light emitting direction of the device is parallel to the displacement direction of the displacement adjustment rod;

[0076] In this way, it can be ensured that the laser beam and the displacement direction of the displacement adjustment rod (including the right adjustment rod 14 and the left adjustment rod 15 in the figure) are not tilted and are focused at the designed position. By limiting the liquid sample collection point (that is, near the focus of the optical path of the device) in both horizontal and vertical dimensions, the accuracy of the liquid sample collection position is improved, thereby improving the success rate of liquid sample collection.

[0077] The distance between the center point of the burnt object limiting structure 13 on the displacement adjustment rod and the light outlet of the laser emitting module 1 is greater than 10 mm, which can make the distance between the burnt object positioning mechanism 3 and the dirt sealing mirror assembly 2 farther, making it more difficult for pollutants to fall on the optical device and reducing the impact of pollutants.

[0078] When the device is sampling, the displacement adjustment rod is stretched to the target position, such as Figure 6 shown.

[0079] After sampling is completed, the displacement adjustment rod can be retracted into the housing, ensuring the design integrity of the device. Figure 7 shown.

[0080] Furthermore, if Figure 5 As shown, as a specific embodiment of the laser burning device provided by the present invention, the laser burning device,

[0081] It is characterized in that

[0082] The main housing includes a main housing positioning structure 16;

[0083] The displacement adjustment rod includes at least one level adjustment positioning structure 17 , and the main housing positioning structure 16 cooperates with at least one of the level adjustment positioning structures 17 on the displacement adjustment rod.

[0084] Since the skin thickness of different people is different, under the design idea of ​​replacing the anti-fouling function of the laser protective cap with a pollution-sealing mirror, the main shell positioning structure 16 cooperates with one or more level adjustment positioning structures 17 on the displacement adjustment rod, so that the distance between the center point of the burned object limiting structure 13 on the displacement adjustment rod and the light outlet of the laser emission module 1 can meet the design requirements of the optical path length of the long focal depth, and has a multi-level adjustment function, which can meet the liquid sample collection needs of people with different skin thicknesses at different gears.

[0085] The displacement adjustment rod has a displacement adjustment in the light emitting direction with each level of not less than 0.5mm, so that the number of levels of optical path length adjustment is reasonable and convenient for all types of users;

[0086] And the pre-tightening force at each level positioning point is greater than 0.5 Newton, so that each level can be firmly fixed, which is convenient for positioning during liquid sample collection.

[0087] For further information, see Figure 8 and Fig. 9 As a specific embodiment of the laser burning device provided by the present invention, the laser burning device,

[0088] It is characterized in that the main housing positioning structure is a ball-type set screw 18 , and the level adjustment positioning structure is a groove 19 matched with the ball-type set screw 18 .

[0089] Here, the groove 19 has a radius of 2.5mm, a depth of 2mm, and a length of 14mm. The end face of the ball-shaped set screw 18 that matches it is a marble with a radius of 2.5mm. The marble is 2mm higher than the step surface of the screw. There is a spring inside the ball-shaped set screw 18 to support the marble. In this way, the displacement adjustment rod needs to overcome the elastic force of the ball-shaped set screw 18 during the displacement process. At the same time, it can stop quickly and accurately when it moves to the groove 19, so as to achieve the purpose of level adjustment and positioning.

[0090] In addition, the design of using the ball-end set screw 18 and the groove 19 matching the ball-end set screw 18 has the advantages of lower cost and easier implementation compared to other designs.

[0091] Furthermore, as a specific embodiment of the laser burning device provided by the present invention, the laser burning device is characterized in that:

[0092] The burnt object limiting structure 13 is a groove 19 with a depth of 5 to 9 mm, a radius of 9 to 13 mm, and a width of 20 to 25 mm.

[0093] The optimal limiting mechanism for the burned object here is a 7mm deep groove on the displacement adjustment rod, with an approximate radius of 11mm and a width of 22.5mm. The diameter of a human finger is generally 13mm to 22mm, which makes it convenient to place a human finger in this groove, making it difficult for the finger to move and facilitating liquid sample collection.

[0094] Furthermore, if Fig.10 As shown, as a specific embodiment of the laser burning device provided by the present invention, the laser burning device,

[0095] It is characterized in that

[0096] The optical path between the laser emitting module 1 and the dirt-proof mirror assembly 2 also includes a beam reducing mirror assembly 20.

[0097] The beam reducer assembly 20 has a positive optical power and a light aperture of less than 10 mm, so that the spot radius at the light waist of the device is less than 0.7 mm.

[0098] The beam reducer assembly 20 is located on the optical path of the device and ensures that the focal depth of the optical path of the device is greater than 4 mm.

[0099] The main design function of the beam reducer assembly 20 is to lengthen the focal depth of the device, so as to ensure that the focal depth range of the optical path of the device is greater than that of the existing portable laser liquid sample collection equipment.

[0100] This is because when the portable laser liquid sample collection equipment no longer uses a laser protective cap, if there is no other device to ensure the focusing function, a slight deviation will cause the laser spot to expand rapidly, and the energy will no longer be focused on a very small range. The energy dispersion will easily lead to the inability to burn and vaporize the skin, resulting in the inability of the liquid sample to flow out and the inability to complete the liquid sample collection.

[0101] In order to solve the problem that the distance range of the burned object is too small when the portable laser is used to collect effective liquid samples, we have carefully designed and used the long focal depth design of the laser burning device to replace the positioning function of the existing laser protective cap, and the burning of the burned object can be relatively freely adjusted within the focal depth range of the device's optical path, thereby providing a better user experience.

[0102] Since the skin is composed of the epidermis and dermis, the total thickness is between 0.5mm-4mm, with an average of more than 1mm. The epidermis on the fingers is a thick, hairless epidermis, which is composed of the stratum corneum, the clear layer, the granular layer and the germinal layer. The melanin produced by the germinal layer determines the color of the skin. The entire epidermis is avascular and gray and translucent, with a thickness of 0.066mm-0.178mm. The dermis is composed of the papillary layer and the reticular layer, with a large number of microvessels, lymphatic vessels and nerve endings. The dermis does not contain melanin and is white and opaque, with a thickness of 0.4mm-4mm.

[0103] Therefore, only when the incision made by the laser penetrates deep into the dermis tissue can it cut open the micro-blood vessels in the dermis to allow the liquid sample to flow out.

[0104] Based on the maximum thickness of 4 mm, in order to achieve liquid sample collection, the laser spot must be as small as possible within the 4 mm thickness, and this range should be within the focal depth range.

[0105] Here, the focal depth is defined as the distance between two axial coordinates when the axial intensity drops to 1 / 2 of the central intensity,

[0106] That is, DOF=2|ZR|, ZR=M2*(f*f)*a / (2*pi*(r*r)),

[0107] Where ZR is the Rayleigh length, M2 is the beam quality factor, f is the focal length of the lens group, a is the laser wavelength, and r is the spot radius of the lens incident surface. The size of M2 is 7.69, the size of a is 2.94μm, and the size of r is 0.43mm.

[0108] It can be calculated from the above formula that f≥14.336mm, so when designing the lens group, the focal length range should be f≥14.336mm to ensure the focal depth requirement for liquid sample collection.

[0109] Through such a design scheme, the focal depth of the portable laser liquid sample collection equipment has increased from the traditional less than 0.5mm to greater than 4mm, and the focal depth has increased by more than 8 times, thereby greatly broadening the range of liquid sample collection, effectively reducing the probability of liquid samples failing to flow out, and greatly improving the product's fault tolerance.

[0110] In addition to the above-mentioned telephoto focusing lens similar design, the design method of long focal depth also includes but is not limited to the following methods:

[0111] 1. Conical mirror;

[0112] 2. Binary diffraction element;

[0113] 3. Use multiple reflections to lengthen the light path to extend the focal depth.

[0114] In addition, according to our design, the maximum energy of the light outlet of the laser ablation device is greater than 180mJ, and the maximum radius of the light outlet of the laser ablation device is less than 2mm, which ensures that the laser energy focused within the focal depth range is sufficient to burn through the dermis and complete the liquid sample collection function.

[0115] Furthermore, as a specific embodiment of the laser burning device provided by the present invention, the laser burning device,

[0116] It is characterized in that

[0117] The lens surface of the beam reducer assembly 20 close to the optical waist of the device is a flat surface, and the lens surface away from the optical waist of the device is a convex surface;

[0118] The outgoing laser is beam-contracted within the effective aperture of the beam-contracting mirror assembly 20 so that the spot radius at the laser waist is reduced. In addition, the first surface of the beam-contracting mirror assembly 20 is convex and the second surface is flat, which is conducive to smoother beam contraction of the laser and further reduces the spot radius at the laser waist.

[0119] The beam reducer assembly 20 is coated with a combined film layer of laser band anti-reflection and white light band anti-reflection at both ends of the beam reducer assembly 20 by vacuum deposition coating process. The anti-reflection band of the anti-reflection film layer is 2940+ / -100nm.

[0120] In this way, the laser energy loss is reduced by coating the combined film layer, so that the laser energy can be used to the maximum extent and can burn and vaporize micropores to achieve the purpose of burning holes and facilitating liquid sample collection. Compared with traditional coating technology, the vacuum deposition coating process can obtain high-density and high-bonding coatings and can be processed at low temperatures, so as not to affect the substrate performance of the parts.

[0121] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A laser burning device, Features It comprises a laser emission module (1), a dirt sealing mirror assembly (2) and a burnt object positioning mechanism (3). The laser emitted by the laser emission module (1) is irradiated onto the object to be burned through the dirt-sealing mirror assembly (2); the dirt-sealing mirror assembly (2) is located on the optical path of the device, with its center being more than 4 mm away from the optical waist of the device, and its light aperture radius being less than 10 mm; The burnt object positioning mechanism (3) is used to place the burnt object and ensure that the burnt portion of the burnt object is located within a range of plus or minus 2 mm from the light waist of the device; A semi-open cavity (10) is formed by a closed structure between the light-through hole (9) of the dirt-sealing mirror assembly (2) and the burned part of the burned object; one end of the light-through hole is closed by a dirt-sealing lens (11) on the dirt-sealing mirror assembly (2); and the inner wall of the semi-open cavity (10) is a threaded structure (12) or an annular toothed structure.

2. A laser burning device as claimed in claim 1, characterized in that: The lens surface focal length of the dirt-sealing mirror assembly (2) is less than 0.1, and is coated with a laser anti-reflection film layer.

3. A laser ablation device as claimed in claim 1, The main housing is further comprised of an upper main housing (4) and a lower main housing (5), the upper main housing (4) and the lower main housing (5) being tightly fastened, and the laser emission module (1) and the dirt sealing mirror assembly (2) are both fixed inside the main housing. Features The main housing further comprises an upper fastener (6) and a lower fastener (7), which are respectively locked with the upper main housing (4) and the lower main housing (5); the upper fastener (6) and the lower fastener (7) have openings at the front ends thereof which fit with the burnt object positioning mechanism (3) and a light outlet opening (8) of the dirt-sealing mirror; the opening which fits with the burnt object positioning mechanism (3) is an opening of the same size as the cross-section of the burnt object positioning mechanism (3); the center of the opening is the light outlet opening (8) of the dirt-sealing mirror, and a light-through hole (9) of the dirt-sealing mirror assembly (2) is embedded therein.

4. A laser ablation device as claimed in claim 3, It is characterized in that The burnt object positioning mechanism (3) can be pulled out of or pushed back into the main housing.

5. A laser ablation device as claimed in claim 4, It is characterized in that The burnt object positioning mechanism (3) comprises one or more displacement adjustment rods, and the light emitting direction of the device is parallel to the displacement direction of the displacement adjustment rods; The displacement adjustment rod comprises a burnt object limiting structure (13) for limiting the placement position of the burnt object; when the displacement adjustment rod is withdrawn from the main housing, the distance between the center point of the burnt object limiting structure (13) on the displacement adjustment rod and the light outlet of the laser emission module (1) is greater than 10 mm.

6. A laser ablation device as claimed in claim 5, It is characterized in that The main housing comprises a main housing positioning structure (16) inside; the displacement adjustment rod comprises at least one level adjustment positioning structure (17), and the main housing positioning structure (16) cooperates with at least one level adjustment positioning structure (17) on the displacement adjustment rod.

7. A laser ablation device as claimed in claim 1, It is characterized in that The burnt object limiting structure (13) is a groove (19) with a depth of 5 to 9 mm, a radius of 9 to 13 mm, and a width of 20 to 25 mm.

8. A laser ablation device as claimed in claim 1, It is characterized in that A beam reducing mirror assembly (20) is also included in the optical path between the laser emission module (1) and the dirt sealing mirror assembly (2); the beam reducing mirror assembly (20) has a positive optical focal length and a light aperture of less than 10 mm, so that the spot radius at the optical waist of the device is less than 0.7 mm.

9. A laser ablation device as claimed in claim 8, It is characterized in that The lens surface of the beam reducer assembly (20) close to the optical waist of the device is a plane, and the lens surface away from the optical waist of the device is a convex surface; the beam reducer assembly (20) is coated with a combined film layer of laser waveband anti-reflection and white light waveband anti-reflection at both ends of the beam reducer assembly (20) through a vacuum deposition coating process.

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