Inclined rotating device based on femtosecond laser and angle-controllable spherical crown cutting method

Abstract

The invention provides an inclined rotating device based on femtosecond laser, and the device comprises a femtosecond laser system which is used for transmitting a femtosecond laser beam to cut an object; the device further comprises a driving system, an inclined supporting device and a vacuum adsorption system. The driving system is used for driving an object to move; the vacuum adsorption system is connected with the driving system and is used for adsorbing the object; the driving system comprises a stepping motor, and the stepping motor is arranged on the inclined supporting device; the vacuum adsorption system comprises an adsorption assembly and a vacuum pump, the adsorption assembly is arranged at one end of the stepping motor, the vacuum pump is arranged at the other end of the stepping motor, and the adsorption assembly adsorbs objects through the vacuum pump. The inclined rotating posture of the polymer ball is controlled through cooperation of the stepping motor, the inclined supporting device and the vacuum adsorption system, meanwhile, the concentricity of the polymer ball in the high-speed rotating process is guaranteed, the controllable angle is achieved under the condition that the laser incidence direction is not changed, operation is easy and convenient, and certain flexibility is achieved.

Description

Technical Field

[0001] The present application relates to the field of laser micromachining technology, and in particular to a femtosecond laser-based tilting and rotating device and a controllable angle spherical crown cutting method. Background Art

[0002] Energy is the core driving force behind human survival and development. Controlled nuclear fusion, with its high energy output, abundant fuel reserves, environmental friendliness, and excellent safety, is considered a "clean" and "efficient" form of future energy, marking a fundamental shift in the way energy is produced and used.

[0003] In the process of achieving controlled nuclear fusion, carbon-deuterium (CD) spherical caps serve as the core material in laser ablation experiments, generating high-energy neutrons through deuterium-deuterium collisions. Furthermore, because the neutron background noise present in the ablation zone can interfere with experimental results, a layer of carbon-hydrogen (CH) is deposited on the surface of the CD spherical cap to create a carbon-deuterium-carbon-hydrogen (CD-CH) composite cap to reduce interference with colliding neutron detection. Since CD hollow spheres are fabricated using microfluidics, the hollow spheres must be cut to form the desired cap structure to meet assembly requirements on the target holder.

[0004] Existing high-precision cutting methods include ultraviolet laser cutting and micro-mechanical cutting technology. However, when cutting tiny polymer hollow spheres, ultraviolet laser cutting can easily cause material melting, edge carbonization, and the generation of microcracks and bubbles. Micro-mechanical cutting can easily cause deformation or even rupture of the spheres due to contact processing. Femtosecond lasers have ultra-short pulses and extremely high peak power, which can achieve "cold processing" and effectively avoid thermal damage to the material, crack generation, and structural deformation. However, since traditional devices only support vertical incidence of the laser beam and static fixation of the workpiece, there is a lack of efficient and stable process support in the cutting of spatial angles or curved structures. The cutting surface is often limited to the vertical direction, which causes the plasma to not be evenly pressed on the surface of the spherical crown, and the laser utilization rate is low.

[0005] A search revealed a Chinese invention patent application with publication number CN113732485A, which discloses a high-precision laser rotation processing method. The specific process includes: clamping a micro-tube and positioning it so that the output position of the laser beam is aligned with and focused on the micro-tube; controlling the output position of the laser beam to rotate at a uniform speed along the circumference of the micro-tube. After reaching a set peak, the laser beam is output according to the micro-tube processing parameters to process the micro-tube. However, the patent still has the following problems: it only targets regular, linearly extended tube structures, making it difficult to achieve fine processing requirements such as tiny spheres and complex curved surfaces. Furthermore, it can only rotate horizontally, which limits the processing angle. Summary of the Invention

[0006] In view of one of the defects in the prior art, the purpose of this application is to provide a tilt-rotation device based on femtosecond laser.

[0007] In a first aspect of the present application, a femtosecond laser-based tilting and rotating device is provided, comprising: a femtosecond laser system for emitting a femtosecond laser beam to cut an object;

[0008] It also includes: a driving system, a tilting support device and a vacuum adsorption system;

[0009] The driving system is used to drive the object to move;

[0010] The vacuum adsorption system is connected to the driving system and is used to adsorb the object;

[0011] The driving system includes a stepper motor, and the stepper motor is arranged on the tilt support device;

[0012] The vacuum adsorption system includes an adsorption component and a vacuum pump. The adsorption component is arranged at one end of the stepping motor, and the vacuum pump is arranged at the other end of the stepping motor. The adsorption component adsorbs the object through the vacuum pump.

[0013] Optionally, the stepper motor includes a rotating shaft, which is a hollow structure. The vacuum pump is connected to the adsorption component through the hollow structure of the rotating shaft, so that the adsorption component has an adsorption effect.

[0014] Optionally, the vacuum adsorption system further includes an air guide tube;

[0015] One end of the air guide tube is connected to one end of the rotating shaft, and the other end is connected to the vacuum pump.

[0016] Optionally, the vacuum adsorption assembly further includes a pneumatic air pipe connector;

[0017] The pneumatic air pipe connector is arranged between the air guide pipe and the rotating shaft;

[0018] One end of the pneumatic airway connector is connected to the rotating shaft, and the other end of the pneumatic airway connector is connected to the air guide tube;

[0019] Wherein, one end of the pneumatic air pipe connector connected to the rotating shaft is rotatable.

[0020] Optionally, the drive system further comprises: a control device, a DC power supply and a speed modulation module;

[0021] One end of the control device is connected to the stepping motor, and the other end is connected to the DC power supply, and the control device provides a pulse signal input to the stepping motor through the DC power supply;

[0022] The speed modulation module is connected to the control device and is used to control and adjust the rotation speed of the stepping motor;

[0023] The adjustable speed range of the stepper motor is 0-1000 rpm.

[0024] Optionally, the inclined support device includes: a base plate, an inclined connecting plate and a support plate;

[0025] One end of the base plate is connected to one end of the support plate, the other end of the support plate is connected to one end of the inclined connecting plate, and the other end of the inclined connecting plate is connected to the base plate to form a triangular support structure;

[0026] The stepping motor is arranged on the inclined connecting plate.

[0027] Optionally, the inclined connecting plate is provided with a circular hole and a mounting hole;

[0028] The mounting holes have a plurality of evenly spaced locations on the periphery of the circular hole;

[0029] The stepper motor is fixed to the inclined connecting plate through the mounting hole;

[0030] The air guide tube passes through the circular hole and is connected to the rotating shaft.

[0031] Optionally, the inclined support device further includes an inclined support plate, which is arranged between the inclined connecting plate and the base plate, and a collection chamber is formed between the inclined support plate and the base plate for receiving the cut parts.

[0032] Optionally, the base plate, the inclined connecting plate, the support plate and the diagonal support plate are integrally formed.

[0033] In a second aspect of the present application, a method for preparing a controllable angle polymer spherical cap based on a femtosecond laser tilting and rotating device is provided, comprising:

[0034] Fix the tilting and rotating cutting device on the precision positioning platform;

[0035] Start the vacuum adsorption system, fix the polymer ball on the stepper motor through the adsorption component, set the rotation parameters and start the stepper motor;

[0036] Next, the femtosecond laser system is started, the focus is focused on the center position of the upper surface of the polymer ball through the objective lens, and the laser parameters are set;

[0037] The polymer ball is controlled to tilt and rotate by a driving system, and a laser is output at a fixed spatial position to perform fixed-point cutting, thereby achieving controllable angle of the spherical crown cutting surface of the polymer ball.

[0038] The present application provides a femtosecond laser-based tilting and rotating device, which realizes the control of the tilting and rotating posture of an object through the coordinated control of a stepping motor, a tilting support structure and a vacuum adsorption system, while ensuring the concentricity of the polymer ball during high-speed rotation. Each part can be designed and processed independently, and the operation is simple and flexible. At the same time, it combines the advantages of femtosecond laser processing technology and controllable angle cutting technology, and realizes three-dimensional micro-nano processing with controllable angle, high precision and high flexibility without changing the laser incident direction, which significantly improves the degree of freedom and application scope of femtosecond laser in the processing of complex micro-nano structures.

[0039] Other technical effects brought about by the additional features will be further explained in the corresponding embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0041] Figure 1 1 is a schematic structural diagram of a femtosecond laser-based tilt-rotation device according to an exemplary embodiment;

[0042] Figure 2 is a schematic structural diagram of an inclined support device according to an exemplary embodiment;

[0043] Figure 3 is a schematic structural diagram of an inclined support device at another angle according to an exemplary embodiment;

[0044] Figure 4 A schematic diagram of the cutting results of a polymer spherical cap using a femtosecond laser-based tilting and rotating device is shown according to an exemplary embodiment, wherein 3-1 is a schematic diagram of the appearance of the spherical cap obtained by a traditional cutting method, and 3-2 is a schematic diagram of the appearance of the spherical cap obtained by a femtosecond laser-based tilting and rotating device.

[0045] In the figure: 1. Femtosecond laser system; 2. Tilt support device; 3. Polymer ball; 4. Adsorption assembly; 5. Stepper motor; 6. Pneumatic air pipe connector; 7. Air guide tube; 8. Vacuum pump; 9. Control device; 10. DC regulated power supply; 11. Speed modulation module; 21. Base plate; 22. Diagonal support plate; 23. Tilt connecting plate; 24. Support plate; 25. Mounting hole; 26. Circular hole. DETAILED DESCRIPTION

[0046] The present application is described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present application, but are not intended to limit the present application in any form. It should be noted that, without departing from the concept of the present application, a number of variations and improvements may be made by those skilled in the art, and these all fall within the scope of protection of the present application. Parts not described in detail in the following examples may be implemented using existing technologies.

[0047] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0049] In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly specified and specifically defined. In the present application, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the embodiments of the present application, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to the process, method, product, or apparatus.

[0051] Conventional devices in the prior art only support vertical laser beam incidence and static workpiece fixation. This lacks efficient and stable process support for cutting spatial angles or curved structures. The cutting surface is often limited to the vertical direction, which results in uneven plasma pressure on the spherical cap surface, low laser utilization, and limited horizontal rotation, limiting the processing angle. To address these issues, the present invention provides a femtosecond laser-based tilting and rotating device to address these issues.

[0052] Reference Figure 1 As shown, in one embodiment of the present application, a tilting and rotating device based on femtosecond laser includes: a femtosecond laser system 1 for emitting a femtosecond laser beam to cut an object.

[0053] The system further includes a drive system 100, a tilting support device 2, and a vacuum adsorption system 200. The drive system 100 is used to drive the object to move; the vacuum adsorption system 200 is connected to the drive system 100 and is used to adsorb the object; the drive system 100 includes a stepper motor 5, which is mounted on the tilting support device 2; the vacuum adsorption system 200 includes an adsorption assembly 4 and a vacuum pump 8, which is mounted on one end of the stepper motor 5 and the other end of the stepper motor 5. The adsorption assembly 4 adsorbs the object via the vacuum pump 8.

[0054] Specifically, by setting up a driving system 100, a tilting support device 2 and a vacuum adsorption system 200, first, the object is adsorbed on the stepper motor 5 of the driving system 100 through the vacuum adsorption system 200, and then during the object cutting process, the driving system 100 drives the stepper motor 5 to drive the object to rotate at different angles. At the same time, the tilting support device 2 tilts the stepper motor 5 to control the tilting and rotation posture of the object, and the femtosecond laser system 1 is used to process different angles of the object, thereby achieving the preparation of complex structures of the object.

[0055] It should be noted that the object described below is replaced by a polymer ball 3. Of course, in other embodiments, the object may be other options and is not limited to the polymer ball.

[0056] In the above-mentioned embodiment of the present application, the tilting and rotating posture of the spherical shell is controlled by the stepping motor 5, the tilting support device 2 and the vacuum adsorption system 200, while ensuring the concentricity of the polymer ball 3 during high-speed rotation. Each part can be designed and processed independently, and the operation is simple and flexible. At the same time, the advantages of femtosecond laser processing technology and controllable angle cutting technology are combined to achieve three-dimensional micro-nano processing with controllable angle, high precision and high flexibility without changing the incident direction of the laser, which significantly improves the degree of freedom and application range of femtosecond laser in the processing of complex micro-nano structures.

[0057] In order to achieve the effect of adsorbing objects while the stepper motor 5 rotates, in some specific embodiments of the present application, the stepper motor 5 includes a rotating shaft, which is a hollow structure. The vacuum pump 8 is connected to the adsorption component 4 through the hollow structure of the rotating shaft, so that the adsorption component 4 has an adsorption effect.

[0058] Specifically, by setting the rotating shaft of the stepper motor 5 as a hollow structure, the vacuum pump 8 and the adsorption component 4 of the vacuum adsorption system 200 are connected through the rotating shaft, the vacuum pump 8 generates negative pressure, and the negative pressure acts on the adsorption component 4 through the rotating shaft, and the adsorption component 4 is set at one end of the rotating shaft, and the other end of the rotating shaft is connected to the vacuum pump 8, so that the rotating shaft can adsorb objects while rotating.

[0059] In the above embodiment of the present application, the rotating shaft of the stepper motor 5 is set to a hollow structure, so that the adsorption capacity of the vacuum adsorption system 200 is realized through the rotating shaft. While the rotating shaft adsorbs the polymer ball 3 through the adsorption component 4, the angle of the polymer ball 3 can be adjusted by its own rotation to realize the preparation of the polymer ball 3 crown, simplifying the complexity of the structure and reducing the cost.

[0060] In some specific embodiments of the present application, the vacuum adsorption system 200 further includes an air duct 7 ; one end of the air duct 7 is connected to one end of the rotating shaft, and the other end is connected to the vacuum pump 8 .

[0061] Specifically, in one embodiment, the air duct 7 is connected to one end of the rotating shaft, and the adsorption component 4 is arranged at the other end of the rotating shaft. The vacuum pump 8 generates negative pressure, the air duct 7, the rotating shaft and the adsorption component 4 to achieve adsorption and rotation of the polymer ball 3. In the present application, the air duct 7 on the vacuum adsorption system 200 can also be extended into the vacuum structure of the rotating shaft, one end is connected to the vacuum pump 8, and the other end is connected to the adsorption component 4. In this embodiment, the air duct 7 can rotate with the rotating shaft.

[0062] The adsorption assembly 4 is a replaceable structure, including but not limited to a dispensing needle, a clamping mechanism, or a custom adsorption interface, for adapting to polymer balls 3 of different sizes or structures. The vacuum adsorption system 200 has adjustable gas volume and pressure to adapt to balls of different sizes or structures.

[0063] It should be noted that to achieve precise adsorption of the polymer balls 3, the front end of the stepper motor 5 is mechanically secured to the dispensing needle (adsorption assembly 4) via a threaded structure, ensuring assembly stability and maintainability. The rear end of the stepper motor 5 is connected to the vacuum adsorption system 200, which utilizes the hollow structure of the stepper motor 5's rotating shaft to achieve vacuum adsorption of the polymer balls 3.

[0064] Among them, the diameter of the needle tip of the dispensing needle at the glue outlet is 0.6mm.

[0065] In some specific embodiments of the present application, the vacuum adsorption system 200 also includes a pneumatic air tube connector 6; the pneumatic air tube connector 6 is arranged between the air guide tube 7 and the rotating shaft; one end of the pneumatic air tube connector 6 is connected to the rotating shaft, and the other end of the pneumatic air tube connector 6 is connected to the air guide tube 7.

[0066] Among them, one end of the pneumatic air pipe connector 6 connected to the rotating shaft is rotatable.

[0067] Specifically, when the air duct 7 is connected to the rotating shaft, the rotating shaft will drive the air duct 7 to rotate. In order to ensure that the air duct 7 directly connected thereto does not become entangled during high-speed rotation, causing mechanical failure and failure, a 360° high-speed rotating pneumatic air duct connector 6 is further provided between the air duct 7 and the rotating shaft of the stepper motor 5, so that when one side of the hollow rotating shaft rotates at high speed, the air duct 7 on the other side can remain stationary to avoid entanglement.

[0068] It should be noted that the vacuum adsorption system 200 includes a small negative pressure vacuum pump 8 and an air duct 7. The stepper motor 5 is connected to the small negative pressure vacuum pump 8 through the air duct 7. The air volume of the small negative pressure vacuum pump 8 is adjustable from 3 to 18 L / min, and the negative pressure air volume is 0.065 mPa.

[0069] In some specific embodiments of the present application, the drive system 100 further includes: a control device 9, a DC power supply 10, and a speed modulation module 11. The control device 9 is connected to the stepper motor 5 at one end and to the DC power supply 10 at the other end. The control device 9 provides a pulse signal input to the stepper motor 5 via the DC power supply 10. The speed modulation module 11 is connected to the control device 9 and is used to control and adjust the rotation speed of the stepper motor 5.

[0070] The adjustable speed range of the stepping motor 5 is 0-1000 rpm.

[0071] Specifically, by setting up a control device 9, when controlling the stepper motor 5, the DC power supply 10 generates a DC regulated voltage source, which provides a pulse input to the stepper motor 5 through the control device 9 to control the rotation of the stepper motor 5. At the same time, a speed modulation module 11 is set to adjust the number of revolutions of the stepper motor 5 to realize the control of the stepper motor 5.

[0072] It should be noted that the stepper motor 5 has a current of 3A, a shaft diameter of 10mm, a torque of 1.0NM, and an adjustable speed range of 0-1000rpm. In a preferred embodiment, the drive system 100 includes a DC power supply 10 that provides a 24V pulse input to the stepper motor 5.

[0073] Reference Figures 2 to 3As shown, in some specific embodiments of the present application, the tilt support device 2 includes: a base plate 21, a tilt connecting plate 23, and a support plate 24. One end of the base plate 21 is connected to one end of the support plate 24, the other end of the support plate 24 is connected to one end of the tilt connecting plate 23, and the other end of the tilt connecting plate 23 is connected to the base plate 21, forming a triangular support structure; the stepping motor 5 is disposed on the tilt connecting plate 23.

[0074] The present application provides a femtosecond laser-based tilting and rotating device, which can achieve stable adsorption of complex spherical structures such as micron-scale and high-precision processing at any position through the combination of a high-speed rotating hollow stepper motor 5, a vacuum pump 8 and a tilting support device 2, thereby expanding the types of micro-processing objects and significantly improving the angle control accuracy and consistency of repeated processing.

[0075] In some specific embodiments of the present application, a circular hole 26 and a mounting hole 25 are provided on the inclined connecting plate 23; the mounting hole 25 has a plurality of evenly spaced holes arranged on the periphery of the circular hole 26; the stepper motor 5 is fixed to the inclined connecting plate 23 through the mounting hole 25; the air guide tube 7 passes through the circular hole 26 and is connected to the rotating shaft.

[0076] In some specific embodiments of the present application, the inclined support device 2 further includes an inclined support plate 22, which is disposed between the inclined connecting plate 23 and the base plate 21, and a collection chamber is formed between the inclined support plate 22 and the base plate 21 for receiving the cut parts.

[0077] Specifically, the base plate 21 serves as the bottom support structure of the bracket, with one end fixedly connected to the inclined connecting plate 23. The intermediate diagonal support plate 22 not only provides support for the inclined connecting plate 23 but also forms a collection surface with the base plate 21 for receiving cut spherical crown components. This design effectively prevents the spherical crown from falling onto the positioning platform with vacuum adsorption holes, making it difficult to remove, and facilitates recycling and disposal. The inclined connecting plate 23 is provided with four smaller fixing holes and a larger circular hole 26 in the center. The stepper motor 5 is fixed to the inclined connecting plate 23 using four sets of bolts and nuts through the four fixing holes. The hollow shaft passes through the circular hole 26 to achieve a coaxial connection with the external vacuum system.

[0078] The support plate 24 is located between the base plate 21 and the inclined connecting plate 23, forming a triangular mechanical support structure, which is used to prevent the inclined connecting plate 23 from tilting and deforming due to the long-term gravity load applied by the stepping motor 5, significantly improving the structural stability and service life of the entire machine. The inclined support structure forms a stable three-dimensional load-bearing structure by combining multiple plates. The overall structure is compact, the force is reasonable, and it has both good mechanical properties and manufacturing processability.

[0079] It should be noted that the inclined support device 2 of the present application can be prepared using a 3D printing process. Therefore, when designing the drawings, support structures with different inclination angles can be designed according to different cutting angle requirements.

[0080] In some specific embodiments of the present application, the base plate 21, the inclined connecting plate 23, the support plate 24 and the diagonal support plate 22 are integrally formed.

[0081] In another embodiment of the present application, a method for preparing a polymer spherical cap with a controllable angle is provided, which is implemented using the tilting and rotating device of a femtosecond laser in any of the above embodiments. Specifically, the preparation method includes:

[0082] S1, fix the tilting and rotating cutting device on the precision positioning platform;

[0083] S2, start the vacuum adsorption system, fix the polymer ball on the stepper motor through the adsorption component, set the rotation parameters and start the stepper motor;

[0084] S3, then, start the femtosecond laser system, focus the focal point on the center position of the upper surface of the polymer ball through the objective lens, and set the laser parameters;

[0085] S4, the driving system controls the tilt and rotation of the polymer ball, and outputs laser at a fixed spatial position for fixed-point cutting, so that the angle of the spherical crown cutting surface of the polymer ball can be controlled.

[0086] Specifically, a microfluidic method is used to prepare polymer hollow spheres with good uniformity and size controllability.

[0087] First, turn on the femtosecond laser processing system and preheat the laser to ensure stable output power. At the same time, start the precision positioning platform, perform origin calibration and coordinate initialization, and provide high-precision positioning guarantee for subsequent focusing and cutting. Fix the stepper motor 5 on the tilt support device 2, and the tilt support device 2 is fixed on the multi-axis precision positioning platform to achieve spatial multi-dimensional linkage control. In a preferred embodiment, the multi-axis precision positioning platform has an XY axis accuracy of ±0.75μm, a Z axis accuracy of ±0.325μm, and a maximum speed of ≥500mm / s; the front end of the stepper motor 5 is connected to the dispensing needle, and the rear end is connected to the small negative pressure vacuum pump 8 through a high-speed rotating pneumatic air pipe connector 6 and the air pipe, forming a stable adsorption and rotation transmission mechanism.

[0088] One end of the control device 9 is connected to the stepper motor 5 and the other end is connected to the speed modulation module 11 to accurately control the motor rotation speed. The polymer ball 3 is accurately transferred from the culture dish to the front end of the dispensing needle through the vacuum suction pen. The small negative pressure vacuum pump 8 is turned on and the negative pressure suction is used to fix the ball on the needle. After the transfer is completed, the suction pen is removed to ensure that the ball is firmly positioned. The target polymer ball 3 is identified in the machine vision interface of the femtosecond laser system 1, and the laser spot is focused on the brightest point on the top of the sphere, that is, the highest point of the geometric center of the sphere, and the laser processing parameters are set.

[0089] In a preferred embodiment of the present application, the focusing objective lens has a magnification of 10×, a numerical aperture of 0.26, and a working distance of 30.5 mm. The laser wavelength is 1030 nm, the power is 0.125 W, the repetition rate is 12.5 kHz, the single pulse energy is 50 μJ, and the laser path is set to fixed-point cutting mode. The regulated power supply is activated and the output voltage is adjusted to 24 V. The speed modulation module 11 is used to set the speed of the stepper motor 5 to 300 rpm, causing the polymer ball 3 to begin rotating at a fixed tilt angle.

[0090] To overcome the slight mechanical vibrations caused by the rotation of stepper motor 5, the laser focus position is fine-tuned under a microscope to ensure that the beam is focused on the center of the sphere's tip. The laser cutting process is then initiated, achieving high-precision cutting of the spherical cap structure as the sphere rotates. Because the laser focus is highly aligned with the sphere's rotational center and the cutting path is stable, a polymer cap structure with sharp edges and a controllable tilt angle is formed.

[0091] Through the above steps and the inclined cutting device, the experimental results refer to Figure 4 As shown, 3-1 is a schematic diagram of the appearance of the spherical cap obtained by the traditional cutting method, and 3-2 is a schematic diagram of the appearance of the spherical cap obtained by the tilting and rotating device based on the femtosecond laser. Compared with the traditional cutting method, the present application can form a polymer spherical cap structure with clear edges and controllable tilt angles.

[0092] It should be noted that the output parameters of the femtosecond laser system 1 include but are not limited to: wavelength range of 515–1030 nm, pulse width of 10 ps-290 fs, average laser power of 0.05 W–10 W, repetition frequency range of 1 kHz–1 MHz, and focal length adjustable according to cutting requirements.

[0093] Among them, the precision positioning platform is a part of the structure of the femtosecond laser platform, which can be understood as a stage. By placing the tilting and rotating cutting device on the precision positioning platform, basic three-dimensional movement and laser focusing alignment can be achieved.

[0094] Among them, the multi-axis precision positioning platform supports XYZ three-axis adjustment, has micron-level positioning accuracy and high-speed response capability, and is suitable for complex trajectory control and alignment operations.

[0095] Preferably, the speed of the stepper motor 5 is preferably set in the range of 200-600 rpm, which can be adjusted according to the size, thickness and cutting accuracy requirements of the polymer ball 3.

[0096] The preferred features of the above embodiments can be used alone in any embodiment, or in any combination without conflict. In addition, parts not described in detail in the embodiments can be implemented using existing technologies.

[0097] The above describes some specific embodiments of the present application. It should be understood that the present application is not limited to the specific embodiments described above, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the substantive content of the present application. The above preferred features may be used in any combination as long as they do not conflict with each other.

Claims

1. A femtosecond laser-based tilt-rotation device, comprising: A femtosecond laser system for emitting a femtosecond laser beam to cut an object; characterized in that it also includes: a drive system, a tilt support device and a vacuum adsorption system; The driving system is used to drive the object to move; The vacuum adsorption system is connected to the driving system and is used to adsorb the object; The driving system includes a stepper motor, and the stepper motor is arranged on the tilt support device; The vacuum adsorption system includes an adsorption component and a vacuum pump. The adsorption component is arranged at one end of the stepping motor, and the vacuum pump is arranged at the other end of the stepping motor. The adsorption component adsorbs the object through the vacuum pump.

2. The femtosecond laser-based tilt-rotation device according to claim 1, characterized in that: The stepper motor includes a rotating shaft, which is a hollow structure. The vacuum pump is connected to the adsorption component through the hollow structure of the rotating shaft, so as to enable the adsorption component to have an adsorption effect.

3. The femtosecond laser-based tilt-rotation device according to claim 2, characterized in that: The vacuum adsorption system further includes an air guide tube; One end of the air guide tube is connected to one end of the rotating shaft, and the other end is connected to the vacuum pump.

4. The femtosecond laser-based tilt-rotation device according to claim 3, characterized in that: The vacuum adsorption assembly also includes a pneumatic air pipe connector; The pneumatic air pipe connector is arranged between the air guide pipe and the rotating shaft; One end of the pneumatic airway connector is connected to the rotating shaft, and the other end of the pneumatic airway connector is connected to the air guide tube; Wherein, one end of the pneumatic air pipe connector connected to the rotating shaft is rotatable.

5. The femtosecond laser-based tilt-rotation device according to claim 1, characterized in that: The drive system also includes: a control device, a DC power supply and a speed modulation module; One end of the control device is connected to the stepping motor, and the other end is connected to the DC power supply, and the control device provides a pulse signal input to the stepping motor through the DC power supply; The speed modulation module is connected to the control device and is used to control and adjust the rotation speed of the stepping motor; The adjustable speed range of the stepper motor is 0-1000 rpm.

6. The femtosecond laser-based tilt-rotation device according to claim 4, characterized in that: The tilt support device includes: a base plate, an inclined connecting plate and a support plate; One end of the base plate is connected to one end of the support plate, the other end of the support plate is connected to one end of the inclined connecting plate, and the other end of the inclined connecting plate is connected to the base plate to form a triangular support structure; The stepping motor is arranged on the inclined connecting plate.

7. The femtosecond laser-based tilt-rotation device according to claim 6, characterized in that: The inclined connecting plate is provided with a circular hole and a mounting hole; The mounting holes have a plurality of evenly spaced locations on the periphery of the circular hole; The stepper motor is fixed to the inclined connecting plate through the mounting hole; The air guide tube passes through the circular hole and is connected to the rotating shaft.

8. The femtosecond laser-based tilt-rotation device according to claim 6, characterized in that: The inclined support device further comprises an inclined support plate, which is arranged between the inclined connecting plate and the base plate, and a collecting chamber is formed between the inclined support plate and the base plate for receiving the cut parts.

9. The femtosecond laser-based tilt-rotation device according to claim 8, characterized in that: The base plate, the inclined connecting plate, the supporting plate and the diagonal supporting plate are integrally formed.

10. A method for preparing a controllable angle polymer spherical cap, characterized in that: The femtosecond laser-based tilting and rotating device according to any one of claims 1 to 9 comprises: Fix the tilting and rotating cutting device on the precision positioning platform; Start the vacuum adsorption system, fix the polymer ball on the stepper motor through the adsorption component, set the rotation parameters and start the stepper motor; Next, the femtosecond laser system is started, the focus is focused on the center position of the upper surface of the polymer ball through the objective lens, and the laser parameters are set; The polymer ball is controlled to tilt and rotate by a driving system, and a laser is output at a fixed spatial position to perform fixed-point cutting, thereby achieving controllable angle of the spherical crown cutting surface of the polymer ball.

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