Medical beauty femtosecond laser equipment and processing method

Abstract

The invention relates to the technical field of photoelectric precision instruments, and particularly discloses medical beauty femtosecond laser equipment and a processing method thereof. The device integrates a femtosecond laser, an automatic optical attenuator, an SLM spatial light modulator, a lens system, a CCD camera, an image processing unit and a control unit, and realizes high-precision and personalized improvement of a target object. According to the device, a laser beam is generated through a femtosecond laser, energy is adjusted through an automatic optical attenuator, the phase is modulated through an SLM spatial light modulator to form a multi-focus pattern array, and finally the multi-focus pattern array is tightly focused to a target object through a lens system. The CCD camera shoots an image of a target object, the image processing unit acquires depth information, and the control unit adjusts laser beam parameters according to the information, so that personalized improvement is realized. The machining method comprises the steps of laser beam generation, attenuation, phase modulation, focusing, image shooting and processing, parameter adjustment and the like, and the improved accuracy and safety are ensured.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic precision instrument technology, and specifically to a medical aesthetic femtosecond laser device and a processing method thereof, which aims to provide personalized and precise improvement of a target object by precisely controlling the phase and energy distribution of a laser beam. Background Art

[0002] In the field of medical aesthetics, ultrashort pulse lasers, especially femtosecond pulse lasers, are widely used in freckle removal, skin rejuvenation and other improvements due to their unique physical properties. Femtosecond lasers generate laser pulses with extremely high peak power density, which excite plasma at the focal point of the target tissue, thereby inducing photomechanical explosion and activating the target collagen regeneration mechanism, thereby achieving medical aesthetic effects.

[0003] Compared with nanosecond and picosecond laser pulse beauty devices, femtosecond laser has significant advantages such as ultra-fast, ultra-strong, and cold processing. However, existing femtosecond laser medical beauty devices mainly use a single-focus processing method, and the processing time of this method is proportional to the cube of the structure size, resulting in extremely low processing efficiency.

[0004] In addition, femtosecond laser pulses mainly play a role in light-induced subcutaneous blasting in medical aesthetic applications, so the deviation of the laser beam focus from the target lesion position must be controlled within a very small range (no more than 0.05mm). However, when the existing light-guiding handpiece mechanically presses the target object, it will cause the epithelium on the pressing part to bulge, and the degree of bulge far exceeds the precision requirements of the femtosecond laser focus, causing the laser focus to penetrate too deeply into the subcutaneous part, and the bulge of the curved target object will cause the position depth of the subcutaneous focus to be inconsistent, thus affecting the consistency and stability of the medical aesthetic improvement effect.

[0005] At the same time, the target object itself is curved and irregular in shape, and the conventional light guide design of existing medical beauty equipment is mostly based on the concept of plane improvement, which will result in a shallower irradiation depth in the edge area of ​​the laser and a deeper irradiation depth in the middle part, thus affecting the improvement effects such as melanin removal or skin rejuvenation.

[0006] In summary, existing femtosecond laser medical beauty equipment has obvious technical defects in processing efficiency, focus positioning accuracy, and improvement of adaptation to curved target objects. A new femtosecond laser processing method for medical beauty equipment is urgently needed to solve the above problems. Summary of the invention

[0007] One of the purposes of the present invention is to provide a medical aesthetic femtosecond laser device, which can achieve precise modulation and focusing of the laser beam by precisely controlling the phase and energy distribution of the laser beam, while obtaining depth information of the target object, and then adjusting the processing parameters of the laser beam, thereby achieving high-precision and personalized improvement of the target object.

[0008] In order to solve the above technical problems, the present invention provides a medical aesthetic femtosecond laser device, comprising a femtosecond laser, an automatic light attenuator, an SLM spatial light modulator, a lens system, a CCD camera, an image processing unit, and a control unit arranged in sequence.

[0009] The femtosecond laser is used to generate a laser beam; the automatic optical attenuator includes a half-wave plate and a PBS beam splitter prism, wherein the half-wave plate is arranged on the laser beam output path of the femtosecond laser and cooperates with the PBS beam splitter prism to attenuate the laser beam; The SLM spatial light modulator is used to modulate the phase of the laser beam to form a two-dimensional multi-focus pattern array; The lens system includes at least one Fourier lens and a high numerical lens, wherein the Fourier lens and the high numerical lens form an optical 4f system, perform spatial filtering, and focus the modulated multi-focal array tightly onto the target object; The CCD camera is used to capture an image of the target object; the image processing unit is connected to the CCD camera and is used to process the captured image of the target object and obtain depth information of the target object; The control unit is used to receive the depth information of the target object, and accordingly feed back corresponding phase and energy information to the SLM spatial light modulator to adjust the processing parameters of the laser beam.

[0010] In addition to the above technical features, this application also makes improvements in the following aspects: In some embodiments, a hollow torque motor is also included, which is connected to the half-wave plate and is used to drive the half-wave plate to rotate, thereby changing the polarization state of the laser beam.

[0011] In some embodiments, a diffusion collimating lens group is arranged between the automatic light attenuator and the SLM spatial light modulator to adjust the diameter of the laser beam to be larger than the target surface of the SLM spatial light modulator.

[0012] In some embodiments, the lens system 4 further includes two optical 4f systems, wherein one optical 4f system consists of Fourier lens 1 41 and Fourier lens 2 42 after the laser beam leaves the spatial light modulator 3, and the other optical 4f system consists of Fourier lens 2 42 and a high numerical lens 43.

[0013] In some embodiments, an aperture is provided between the lens systems or between the lens system and the target object for screening and filtering the diffraction orders.

[0014] In some embodiments, the image processing unit includes a color space conversion module and an image recognition module, which are used to recognize and process the image of the surface of the target object.

[0015] In some embodiments, a beam splitter prism is disposed between the CCD camera and the target object for separating the laser beam from the shooting path of the CCD camera.

[0016] Another object of the present invention is to provide a femtosecond laser processing method for medical aesthetics equipment, which uses the medical aesthetics femtosecond laser equipment and comprises the following steps: Using a femtosecond laser to generate a laser beam; The laser beam is attenuated by an automatic optical attenuator composed of a half-wave plate and a PBS beam splitter prism; The phase of the laser beam is modulated using an SLM spatial light modulator to form a two-dimensional multi-focus pattern array; The modulated multi-focal array is focused by a high-value lens; The target object image is captured by a CCD camera, and the captured target object image is subjected to image recognition and processing by an image processing unit to obtain depth information of the target object; According to the depth information of the target object, the phase and energy distribution on the SLM spatial light modulator are adjusted.

[0017] In some embodiments, the SLM spatial light modulator modulates the phase of the laser beam by changing the arrangement of liquid crystal molecules, thereby forming a multi-focal array.

[0018] In some embodiments, the image recognition and processing steps include: interpolating the target object image into a curved surface using a scattered data fitting method, thereby acquiring depth information of the target object.

[0019] In some embodiments, the acquired digital image is a grayscale image or a color image, and the captured digital image is converted into a color space, and the depth information of the target object is reflected through the grayscale value or color space information of the image.

[0020] In some embodiments, the CCD camera captures the target object image as a digital image, and the acquired digital image is a grayscale image or a color image. The image processing unit converts the captured digital image into a color space through a color space conversion module, and reflects the depth information of the target object through the grayscale value or color space information of the image.

[0021] By adopting the above technical solution, the present invention has at least one of the following beneficial effects: 1. High-precision personalized improvement By using a femtosecond laser to generate a laser beam and combining it with an automatic optical attenuator to precisely attenuate the laser beam, fine control of the laser energy can be achieved. The SLM spatial light modulator is used to modulate the phase of the laser beam to form a two-dimensional multi-focus pattern array, so that the laser energy can be more evenly distributed in the improved area, improving the accuracy and effect of the improvement. At the same time, the CCD camera can capture the image of the target object in real time, and obtain the depth information of the target object through image processing technology, and feedback to adjust the phase and energy distribution of the laser, realizing personalized improvement of the target object to meet different needs.

[0022] 2. Efficient use of multi-focal arrays The phase of the laser beam is modulated by changing the arrangement of liquid crystal molecules through the SLM spatial light modulator, and a two-dimensional multi-focus pattern array is formed through the spatial light modulator, so that multiple laser focuses can process the target object at the same time. At the same time, the tight focusing characteristics of the multi-focus array enable the laser energy to act more concentratedly on the surface or deep layer of the target object, achieving precise improvement of the specific target object layer. Compared with the traditional laser single-point processing method, parallel processing technology can significantly improve processing efficiency and shorten improvement time.

[0023] 3. Optimize the lens system to improve processing quality This application introduces a lens system, which constitutes an optical 4f system to achieve a spatial filtering effect and ensure the purity of the laser beam. The lens system can also adjust the focusing characteristics of the laser beam so that the laser energy can act on the target area more accurately, so that the laser energy can accurately act on the target object and target area, achieving micron-level processing accuracy.

[0024] 4. Accurately obtain the depth information of the target object This application uses image processing technology to interpolate a surface through the method of scattered data fitting, converts the captured digital image into color space, and further extracts the depth information of the target object to provide an accurate basis for personalized improvement. By obtaining the depth information of the target object, personalized improvement can be performed according to different target object conditions, thereby improving the improvement effect.

[0025] 5. Improve safety and applicability The entire processing process is based on precise image processing and depth information extraction, which can ensure that the laser energy only acts on the target area to avoid damage to surrounding tissues. By adjusting the phase and energy distribution of the laser, the surface of the target object can be accurately processed, reducing the discomfort during the improvement process. At the same time, this method is not only suitable for the improvement of a single target object layer, but also can adjust the laser parameters according to the depth information of the target object to achieve accurate improvement of multi-layer target objects. Through the application of image recognition technology, rapid identification and processing of different target object types and conditions can be achieved.

[0026] In summary, the medical aesthetic femtosecond laser device and processing method provided by this application achieves high-precision and personalized improvement of the target object by precisely controlling the phase and energy distribution of the laser beam and combining the real-time acquired depth information of the target object. It has the advantages of high improvement accuracy, significant effect, and simple operation, and is suitable for various medical aesthetic improvement scenarios, such as freckle removal, mole removal, and skin rejuvenation. At the same time, it also has real-time monitoring and adjustment functions to ensure the stability and safety of the improvement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 This is the overall working principle diagram of the medical aesthetic femtosecond laser device of the present invention; Figure 2 This is the schematic diagram of the Chinese optical 4f system of the medical aesthetic femtosecond laser device of the present invention; Figure 3 This is an improved schematic diagram of the medical aesthetic femtosecond laser device of the present invention; Figure 4 This is a flow chart of the femtosecond laser processing method for medical beauty equipment of the present invention; Figure 5 The figure is a flowchart of image processing and feedback in the method steps of the present invention.

[0029] The numbers in the figure are as follows: 1. Femtosecond laser; 2. Automatic light attenuator; 21. Half-wave plate; 22. PBS beam splitter; 3. SLM spatial light modulator; 4. Lens system; 41. Fourier lens one; 42. Fourier lens two; 43. High numerical lens; 5. CCD camera; 6. Image processing unit; 7. Control unit; 8. Hollow torque motor; 9. Diffusion collimator group; 10. Beam splitter; 11. Aperture. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is by no means intended to limit the present invention and its application or use. The present invention can be implemented in other different forms and is not limited to the embodiments described herein.

[0031] It should be noted that those skilled in the art explicitly and implicitly understand that the embodiments described in the present invention can be combined with other embodiments without conflict. Unless otherwise defined, the technical terms or scientific terms involved in the present invention should have the common meanings understood by people with ordinary skills in the technical field to which the present invention belongs.

[0032] The words "a", "an", "a", "the" and the like involved in the present invention do not indicate quantity limitation and may indicate singular or plural. The terms "include", "comprises", "has" and any variations thereof involved in the present invention are intended to cover non-exclusive inclusions; the terms "first", "second", "third" and the like involved in the present invention are merely used to distinguish similar objects and do not represent a specific ordering of the objects.

[0033] In the field of medical aesthetics, femtosecond laser technology is widely used due to its unique physical properties, but existing femtosecond laser medical aesthetics equipment faces a series of technical challenges.

[0034] Firstly, the equipment mainly adopts a single-focus processing method, which results in extremely low processing efficiency. The processing time is proportional to the cube of the structure size, which greatly limits the improvement speed.

[0035] Secondly, the problem of laser focus positioning accuracy is prominent. Mechanically pressing the target object will cause epithelial bulges at the pressing site, resulting in deviation of the laser focus position, which in turn affects the consistency and stability of the improvement effect.

[0036] Finally, the design of existing equipment is mostly based on the concept of plane improvement, and cannot effectively adapt to the curved surfaces of the human body and irregularly shaped target objects, resulting in uneven laser irradiation depth, affecting the improvement effects such as melanin removal and skin rejuvenation, and a series of other problems.

[0037] Based on the above problems, the present invention particularly provides a technical solution to solve the above problems. The technical solution, working principle and technical effects of the present invention are described in detail below in conjunction with specific embodiments.

[0038] Reference Figure 1 , Figure 2 , Figure 3 As shown, the present invention describes a medical aesthetic femtosecond laser device, the structure of which is as follows Figure 1 As shown, it includes a femtosecond laser 1, an automatic light attenuator 2, an SLM spatial light modulator 3, a lens system 4, a CCD camera 5, an image processing unit 6 and a control unit 7 which are arranged in sequence.

[0039] The femtosecond laser 1 is used to generate a high-quality femtosecond laser beam having an extremely short pulse width and high peak power, and is suitable for precise processing in the field of medical beauty.

[0040] The automatic optical attenuator 2 includes a half-wave plate 21 and a PBS beam splitter prism 22 .

[0041] The half-wave plate 21 is arranged on the laser beam output path of the femtosecond laser 1 and cooperates with the PBS beam splitter prism 22. By adjusting the rotation angle of the half-wave plate 21, the polarization state of the laser beam can be changed, thereby controlling the attenuation degree of the laser beam by the PBS beam splitter prism 22 and realizing accurate adjustment of the laser beam energy.

[0042] In order to more accurately control the rotation of the half-wave plate 21, the present embodiment further includes a hollow torque motor 8 connected to the half-wave plate 21 for driving the half-wave plate 21 to rotate. In this way, the polarization state of the laser beam can be accurately adjusted by controlling the rotation of the motor, thereby achieving fine adjustment of the laser beam energy.

[0043] The SLM spatial light modulator 3 is used to modulate the phase of the laser beam, and by loading a specific phase pattern, a two-dimensional multi-focus pattern array can be formed. This multi-focus pattern array can achieve multi-point simultaneous processing of the surface of the target object, thereby improving processing efficiency and effect.

[0044] The number and position of the laser focus can be flexibly controlled using computational holography. At the same time, the polarization direction of the laser needs to be consistent with the orientation of the liquid crystal molecules in the liquid crystal plane to ensure pure phase modulation and achieve the best modulation effect.

[0045] When the pre-designed and calculated computer hologram is loaded into the SLM spatial light modulator, the femtosecond laser beam will be modulated into a multi-focus array distributed according to a certain two-dimensional pattern in the focal plane of Fourier lens 1.

[0046] Since the SLM spatial light modulator is also a diffractive optical element, the modulated femtosecond laser beam will also produce multiple diffraction orders.

[0047] During the experiment, only the first-order modulated light passes through the aperture and is focused into the material for parallel processing, while other unnecessary diffraction orders are blocked outside the aperture. The multi-focal array then passes through Fourier lens 2 and is tightly focused onto the target object by a high-value lens.

[0048] The lens system 4 includes at least one Fourier lens and a high-value lens.

[0049] In this embodiment, the lens system 4 further includes two optical 4f systems, one of which is composed of a Fourier lens 1 41 and a Fourier lens 2 42 after the laser beam leaves the spatial light modulator 3, and the other optical 4f system is composed of a Fourier lens 2 42 and a high value lens 43. The two optical 4f systems together play a role of spatial filtering and focus the modulated multi-focus array tightly onto the target object to achieve precise processing.

[0050] Optical 4f system: an optical system with two lenses of focal length f, 2f apart, an object distance of f, and a phase distance of f.

[0051] When two coherent polarized light beams are input, they pass through special optical devices, cosine gratings, transformation planes, etc., so that the input light produces street light on the screen. The precise horizontally moving cosine grating can continuously change the phase difference of the diffraction order of the two beams of light, so as to achieve the purpose of subtracting or adding the incident light intensity.

[0052] In order to adjust the diameter of the laser beam to match the target surface of the SLM spatial light modulator 3, the embodiment provides a diffusion collimator group between the automatic light attenuator 2 and the SLM spatial light modulator 3. In this way, it can be ensured that the laser beam has a uniform intensity distribution and a suitable diameter during the modulation process.

[0053] The CCD camera 5 is used to capture the image of the target object and provide raw data for subsequent image processing.

[0054] In a specific application, the CCD camera 5 can take a picture of the target object through a dichroic prism. We can regard a digital image taken from the picture as a two-dimensional or three-dimensional digital matrix. If it is a grayscale image, it corresponds to a two-dimensional digital matrix, and if it is a color image, it corresponds to a three-dimensional digital matrix.

[0055] Because grayscale images can be regarded as a special form of color images, color images can be regarded as composed of several points in the color space RGB, and there is a linear relationship between other color spaces such as YUV, YIQ and RGB color space.

[0056] The relationship between the common color spaces RGB and YUV can be expressed as follows, denoted by the matrix:

[0057] A and C are the matrix representations of color space YUV and RGB respectively, and B is the relationship matrix between them. The relationship between the two color spaces can be expressed as follows: A=BC Each pixel of the image corresponds to a point in the coordinate space. We can regard these points as type value points and interpolate the image into a surface using the scattered data fitting method.

[0058] Since the target object of the human body itself is a curved surface and irregular shape, the grayscale values ​​of the target object at different distances and near distances in the image are different. For example, the grayscale value will be higher at locations farther from the image plane.

[0059] In this way, the depth information of the target object can be fed back to the computer through the grayscale value information of the image. After calculation, the computer feeds back the corresponding phase and energy information to the SLM spatial light modulator 3 for processing. For example, the laser energy at the edge of the target object needs to be strengthened, and the energy in the middle part needs to be weakened.

[0060] In order to separate the laser beam from the shooting path of the CCD camera 5, the present embodiment sets a beam splitter prism 10 between the CCD camera 5 and the target object. In this way, the target object image can be shot at the same time without affecting the laser processing.

[0061] The image processing unit 6 is connected to the CCD camera 5 and is used to process the captured target object image and obtain the target object depth information. Specifically, the image processing unit 6 includes a color space conversion module and an image recognition module. The color space conversion module is used to convert the captured target object image from the RGB color space into a grayscale image or other color space that is more suitable for image processing. The image recognition module is used to identify and process the converted image and extract the depth information of the target object.

[0062] The control unit 7 is used to receive the depth information of the target object obtained by the image processing unit 6, and accordingly feed back the corresponding phase and energy information to the SLM spatial light modulator 3. In this way, the processing parameters of the laser beam, such as the focal position, energy distribution, etc., can be adjusted according to the actual situation of the target object to achieve personalized medical aesthetic improvement.

[0063] In order to further improve the accuracy and safety of processing, this embodiment also sets an aperture between the lens systems 4 or between the lens system 4 and the target object. The aperture is used to screen and filter the diffraction orders, remove unnecessary diffraction light, and ensure that only the target multi-focal array can reach the target object.

[0064] In summary, the medical aesthetic femtosecond laser device of this embodiment achieves precise processing and personalized improvement of the surface of the target object by precisely controlling the energy, phase, and focal position of the laser beam. At the same time, by capturing and processing the target object image, the depth information of the target object is obtained, providing strong data support for the improvement.

[0065] like Figure 4 , Figure 5 As shown, this embodiment describes in detail a femtosecond laser processing method for medical aesthetics equipment, which is applied to the above-mentioned medical aesthetics femtosecond laser equipment. The following are the specific implementation steps of the method: Step 1: Precise generation of laser beam The advanced femtosecond laser1 technology generates a laser beam with ultra-high energy density and extremely short pulse width. The unique characteristics of this laser beam ensure that the target object can be processed delicately and without thermal damage, laying a solid foundation for subsequent improvement steps.

[0066] Step 2: Fine adjustment of laser energy The energy of the laser beam is precisely controlled by combining the half-wave plate 21 and the PBS beam splitter prism 22 to form an automated light attenuation system. The half-wave plate 21 changes the polarization state of the laser through a precise rotation mechanism, while the PBS beam splitter prism 22 accurately divides the laser into two parts, transmission and reflection, based on the polarization state. By carefully adjusting the rotation angle of the half-wave plate 21, we can fine-tune the laser energy to meet the personalized needs of different improvement scenarios.

[0067] Step 3: Customized Phase Modulation of the Laser Beam The high-performance SLM spatial light modulator 3 is used to customize the phase of the laser beam to generate a complex two-dimensional multi-focus pattern array. The SLM achieves fine adjustment of the laser phase by precisely controlling the arrangement of liquid crystal molecules. This multi-focus pattern can achieve multi-point synchronous processing on the surface of the target object, thereby significantly improving the efficiency and effect of the improvement.

[0068] Step 4: High-precision focusing of the laser beam A high numerical aperture objective lens is used to tightly focus the modulated multi-focal array onto the target object. This objective lens not only has excellent resolution, but also achieves deep focusing, ensuring that the laser beam can accurately act on the target object area, providing improved precise energy delivery.

[0069] Step 5: Accurately capture the target object image and analyze the depth information The target object image is captured by a high-resolution CCD camera 5 and depth information is extracted by an advanced image processing unit 6 .

[0070] The image processing unit 6 first converts the color space, and then analyzes the depth characteristics of the target object through grayscale value or color space information. In addition, it also uses advanced scattered data fitting technology to convert the target object image into a three-dimensional surface, so as to obtain the depth information of the target object more accurately and provide data support for personalized improvement.

[0071] Step 6: Personalized improvement implementation based on deep information According to the depth information of the target object provided by the image processing unit 6, we dynamically adjust the phase and energy distribution on the SLM spatial light modulator 3 to achieve personalized improvement for the target object. After receiving the depth information, the control unit 7 sends a precise control signal to the SLM.

[0072] The SLM adjusts the phase and energy distribution of the laser beam based on these signals to ensure accurate and effective treatment of target tissues at different depths.

[0073] In summary, this embodiment provides a femtosecond laser processing method for medical aesthetic equipment, which achieves high-precision, personalized improvement of the surface of the target object by precisely controlling parameters such as the energy, phase, and focal position of the laser beam. At the same time, the method also combines image processing technology and feedback control technology to ensure the accuracy and safety of the improvement process, and can be widely used in various medical aesthetic improvement scenarios, such as freckle removal, mole removal, skin rejuvenation, etc.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0075] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it; 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 the present invention.

Claims

1. A medical aesthetic femtosecond laser device, characterized by: include, A femtosecond laser (1), an automatic light attenuator (2), an SLM spatial light modulator (3), a lens system (4), a CCD camera (5), an image processing unit (6), and a control unit (7) are arranged in sequence; The femtosecond laser (1) is used to generate a laser beam; the automatic optical attenuator (2) comprises a half-wave plate (21) and a PBS beam splitter prism (22); the half-wave plate (21) is arranged on the laser beam output path of the femtosecond laser (1) and cooperates with the PBS beam splitter prism (22) to attenuate the laser beam; The SLM spatial light modulator (3) is used to modulate the phase of the laser beam to form a two-dimensional multi-focus pattern array; The lens system (4) comprises at least one Fourier lens and a high numerical lens (43), wherein the Fourier lens and the high numerical lens (43) form an optical 4f system, perform spatial filtering, and tightly focus the modulated multi-focal array onto a target object; The CCD camera (5) is used to capture an image of the target object; the image processing unit (6) is connected to the CCD camera (5) and is used to process the captured image of the target object and obtain depth information of the target object; The control unit (7) is used to receive the depth information of the target object, and accordingly feed back corresponding phase and energy information to the SLM spatial light modulator (3) to adjust the processing parameters of the laser beam.

2. The medical aesthetic femtosecond laser device according to claim 1, characterized in that: It also includes a hollow torque motor (8) connected to the half-wave plate (21) and used to drive the half-wave plate (21) to rotate, thereby changing the polarization state of the laser beam.

3. The medical aesthetic femtosecond laser device according to claim 1, characterized in that: A diffusion collimating lens group (9) is arranged between the automatic light attenuator (2) and the SLM spatial light modulator (3) to adjust the diameter of the laser beam so that it is larger than the target surface of the SLM spatial light modulator (3).

4. The medical aesthetic femtosecond laser device according to claim 1, characterized in that: The lens system (4) further includes two optical 4f systems, wherein one optical 4f system includes Fourier lens 1 (41) and Fourier lens 2 (42) after the laser beam leaves the spatial light modulator, and the other optical 4f system includes Fourier lens 2 (42) and a high-value lens (43).

5. The medical aesthetic femtosecond laser device according to claim 1, characterized in that: An aperture (11) is arranged between the lens systems (4) or between the lens system (4) and the target object, and is used for screening and filtering diffraction orders.

6. The medical aesthetic femtosecond laser device according to claim 1, characterized in that: The image processing unit (6) comprises a color space conversion module and an image recognition module, which are used to recognize and process the image of the surface of the target object.

7. The medical aesthetic femtosecond laser device according to claim 1, characterized in that: A beam splitter prism (10) is arranged between the CCD camera (5) and the target object and is used to separate the laser beam from the shooting path of the CCD camera (5).

8. A femtosecond laser processing method for medical aesthetics equipment, using the medical aesthetics femtosecond laser equipment according to any one of claims 1 to 7, characterized in that: The following steps are involved: generating a laser beam using a femtosecond laser (1); The laser beam is attenuated by an automatic optical attenuator (2) composed of a half-wave plate (21) and a PBS beam splitter prism (22); A SLM spatial light modulator (3) is used to modulate the phase of the laser beam to form a two-dimensional multi-focus pattern array; focusing the modulated multi-focal array through a high-value lens (43); An image of the target object is captured by a CCD camera (5), and image processing unit (6) performs image recognition and processing on the captured image of the target object to obtain depth information of the target object; According to the depth information of the target object, the phase and energy distribution on the SLM spatial light modulator (3) are adjusted.

9. The femtosecond laser processing method for medical aesthetic equipment according to claim 8, characterized in that: The SLM spatial light modulator (3) modulates the phase of the laser beam by changing the arrangement of liquid crystal molecules, thereby forming a multi-focus array.

10. The femtosecond laser processing method for medical aesthetic equipment according to claim 8, characterized in that: The image recognition and processing steps include: interpolating the target object image into a curved surface using a scattered data fitting method, thereby acquiring depth information of the target object.

11. The femtosecond laser processing method for medical aesthetic equipment according to claim 8, characterized in that: The acquired digital image is a grayscale image or a color image. The captured digital image is converted into a color space, and the depth information of the target object is reflected through the grayscale value or color space information of the image.

12. The femtosecond laser processing method for medical aesthetic equipment according to claim 8, characterized in that: The CCD camera (5) captures the target object image as a digital image, and the acquired digital image is a grayscale image or a color image. The image processing unit (6) performs color space conversion on the captured digital image through a color space conversion module, and reflects the depth information of the target object through the grayscale value or color space information of the image.

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