Light beam adjusting device

Abstract

The invention discloses a light beam adjusting device. The device comprises a laser light source, a light intensity shaping device and a diaphragm, the laser light source is used for emitting laser beams; the light intensity shaping device is arranged on a propagation path of the laser beam and is used for adjusting the light intensity of the laser beam; the diaphragm is arranged on the propagation path of the adjusted laser beam and is used for adjusting the light spot shape of the laser beam; the diaphragm is an annular diaphragm and comprises an inner frame; the inner frame comprises a sawtooth structure. According to the technical scheme, shaping of the light spot shape of the laser beam is achieved through the diaphragm, the problem that the strengthening effect is poor due to the fact that the original laser beam is used when the attributes of the to-be-strengthened material, the to-be-strengthened area and the strengthening technology are different is solved, meanwhile, the diffraction effect of the laser beam can be improved through the sawtooth structure in the diaphragm, and the strengthening effect is improved. And the laser beam strengthening quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and in particular to a light beam adjustment device. Background Art

[0002] Laser shock peening technology is a technology that uses laser-induced shock waves to strengthen the metal surface. Due to its good surface strengthening effect, it has received widespread attention and research since its inception.

[0003] In the application scenarios of laser shock peening technology, due to the differences in the properties and detailed shape structures of the materials to be strengthened, it is necessary to adaptively adjust parameters such as the shape, size, and intensity distribution of the light spot, thereby solving problems such as poor shock peening effect and long processing time in existing technologies.

[0004] In the prior art, the laser beam adjusts the shape of the light spot through an aperture. However, the aperture in the prior art has a certain diffraction effect due to structural limitations, which leads to inaccurate imaging of the light spot, thereby affecting the effect of laser shock peening. Summary of the Invention

[0005] The present invention provides a beam adjustment device to solve the problem in the prior art that the structural setting of the aperture causes a diffraction effect in the laser beam, thereby resulting in poor laser shock peening effect.

[0006] According to one aspect of the present invention, there is provided a light beam adjustment device, comprising:

[0007] Laser light sources, light intensity shaping devices and apertures;

[0008] The laser light source is used to emit a laser beam;

[0009] The light intensity shaping device is arranged on the propagation path of the laser beam and is used to adjust the light intensity of the laser beam;

[0010] The aperture is arranged on the propagation path of the adjusted laser beam and is used to adjust the spot shape of the laser beam;

[0011] The aperture is an annular aperture including an inner frame;

[0012] The inner frame includes a serrated structure.

[0013] Optionally, the number of sawtooth structures is N, where D is the diameter of the filter aperture, d is the diffraction limit of the laser beam, where

[0014] The height of the sawtooth structure is H, where R is the radius of the aperture, M is a constant, and M satisfies: 4≤M≤8;

[0015] The radius of the aperture is the radius of the circumscribed circle of the cross-sectional shape of the inner frame.

[0016] Optionally, the cross-sectional shape of the inner frame is a triangle, a square, a hexagon or a circle.

[0017] Optionally, the angle between the plane where the aperture is located and the first plane is a preset angle a, where 0° <a<4°;

[0018] The first plane is perpendicular to the propagation direction of the laser beam.

[0019] Optionally, a line connecting the optical center of the light intensity shaping device and the center of the aperture coincides with a propagation direction of the laser beam.

[0020] Optionally, when the laser beam is a flat-top super-Gaussian beam, the transmittance T at position A on the light intensity shaping device satisfies

[0021] Where T0 is the maximum transmittance of the light shaping device, R is the distance between position A and the center of the circle, and ω is T=T0*(1 / e 2 ) is the distance from the center of the circle.

[0022] Optionally, when the laser beam is a Gaussian beam, the transmittance T at position A on the light intensity shaping device satisfies

[0023] Where T0 is the maximum transmittance of the light shaping device, R is the distance between position A and the center of the circle, and ω is T=T0*(1 / e 2 ) is the distance from the center of the circle.

[0024] Optionally, the beam adjustment device further includes a focusing lens;

[0025] The focusing lens is arranged between the light intensity shaping device and the aperture and is used to adjust the focusing position of the laser beam.

[0026] Optionally, the beam adjustment device further includes an external housing, a lens fixing fixture, and an aperture fixing fixture;

[0027] The outer shell includes a receiving space;

[0028] The light intensity shaping device is fixedly embedded in the lens fixing fixture and fixed in the accommodation space through the lens fixing fixture;

[0029] The diaphragm is fixedly embedded in the diaphragm fixing fixture and the diaphragm is fixed in the accommodating space through the diaphragm fixing fixture.

[0030] Optionally, the beam adjustment device further includes a protective window;

[0031] The protection window is fixedly arranged in the accommodating space and is arranged between the light intensity shaping device and the aperture.

[0032] The technical solution of the present invention is to provide a light intensity shaping device and an aperture in the beam adjustment device so that the laser beam can be shaped by the light intensity shaping device, thereby changing the uniformity of the laser beam and improving the strengthening quality. At the same time, the shape of the laser beam spot is shaped by the aperture, which solves the problem of poor strengthening effect caused by using the original laser beam when the properties of the material to be strengthened, the area to be strengthened, and the strengthening process are different. At the same time, the serrated structure in the aperture can improve the diffraction effect of the laser beam and improve the quality of laser beam strengthening.

[0033] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a cross-sectional schematic diagram of a light beam adjustment device provided according to an embodiment of the present invention;

[0036] Figure 2 is a three-dimensional schematic diagram of a light beam adjustment device provided according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic structural diagram of a first light intensity shaping device provided according to an embodiment of the present invention;

[0038] Figure 4 is a schematic structural diagram of a first aperture provided according to an embodiment of the present invention;

[0039] Figure 5 is a partially enlarged structural schematic diagram of a first type of aperture provided according to an embodiment of the present invention;

[0040] Figure 6 is a schematic structural diagram of a second aperture provided according to an embodiment of the present invention;

[0041] Figure 7 is a schematic structural diagram of a third aperture provided according to an embodiment of the present invention;

[0042] Figure 8is a schematic structural diagram of a fourth aperture provided according to an embodiment of the present invention;

[0043] Figure 9 Schematic diagram of the adjustment result of the hard-edged circular aperture in the prior art;

[0044] Figure 10 is a schematic diagram of adjustment results of a sawtooth diaphragm according to an embodiment of the present invention;

[0045] Figure 11 is a structural schematic diagram of a second light intensity shaping device provided according to an embodiment of the present invention;

[0046] Figure 12 This is a schematic diagram of energy distribution of a first laser beam before adjustment according to an embodiment of the present invention;

[0047] Figure 13 2. It is a schematic diagram of energy distribution of a first laser beam after adjustment according to an embodiment of the present invention;

[0048] Figure 14 is a schematic diagram of energy distribution of a second laser beam before adjustment provided by an embodiment of the present invention;

[0049] Figure 15 is a schematic diagram of energy distribution of a second laser beam after adjustment according to an embodiment of the present invention;

[0050] Figure 16 is a structural schematic diagram of a lens fixing fixture provided according to an embodiment of the present invention;

[0051] Figure 17 2 is a schematic structural diagram of an aperture fixing fixture provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0053] It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be practiced in an order other than that illustrated or described herein.

[0054] Figure 1 is a cross-sectional schematic diagram of a light beam adjustment device provided according to an embodiment of the present invention, Figure 2 is a three-dimensional schematic diagram of a light beam adjustment device provided according to an embodiment of the present invention. Figure 3 is a structural diagram of a first light intensity shaping device provided according to an embodiment of the present invention, Figure 4 is a schematic structural diagram of a first aperture provided according to an embodiment of the present invention, Figure 5 The beam adjustment device in the embodiment of the present invention can be applied to the field of laser shock peening technology. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the light beam adjustment device includes:

[0055] Laser light source 1, light intensity shaping device 2 and aperture 3;

[0056] The laser light source 1 is used to emit a laser beam 100;

[0057] The light intensity shaping device 2 is arranged on the propagation path of the laser beam 100 and is used to adjust the light intensity of the laser beam 100;

[0058] The aperture 3 is arranged on the propagation path of the adjusted laser beam 100 and is used to adjust the spot shape of the laser beam 100;

[0059] The aperture 3 is an annular aperture, including an inner frame 31;

[0060] The inner frame 31 includes a sawtooth structure 311 .

[0061] Among them, in the application scenario of laser shock peening technology, due to the different properties of the material to be strengthened and the strengthening process, the power density of the laser beam 100 is also different. The laser light source 1 in the embodiment of the present invention has a power density that is adapted to the properties of the material to be strengthened and the strengthening process, so as to achieve the purpose of strengthening the material to be strengthened.

[0062] The light intensity shaping device 2 is used to adjust the intensity of the laser beam 100. The transmittance at different locations on the light intensity shaping device 2 varies, thereby achieving light intensity shaping. It is understood that different beam shaping devices can have different transmittances at the light intensity shaping device 2 based on the energy distribution of the laser beam 100 in the laser light source 1. For example, the transmittances at the light intensity shaping device 2 vary when shaping a flattened super-Gaussian beam into a Gaussian beam, a Gaussian beam into a flattened super-Gaussian beam, or a flattened super-Gaussian beam into a ring-shaped Gaussian beam. Different beam shaping devices can be selected based on the properties of the material to be strengthened and the strengthening process. In some embodiments, the light intensity shaping device 2 can be made of materials such as fused silica or diamond, and its transmittance is manufactured using special processes such as coating, etching, or special material absorption, which are not limited in this embodiment of the present invention.

[0063] The aperture 3 is used to adjust the spot shape of the laser beam 100. The aperture 3 is an annular aperture and includes an inner frame 31. The imaging of the laser beam 100's spot is limited by the inner frame 31. For example, if the cross-sectional shape of the inner frame 31 is circular, the spot image is circular, and the corresponding single-strengthening area is also circular. In the embodiments of the present invention, the cross-sectional shape of the inner frame 31 can be determined based on the area to be strengthened. It is understood that when the area to be strengthened has a complex shape, a single-shaped spot shape can lead to poor impact strengthening results and excessive processing time. The appropriate spot shape can be selected based on the area to be strengthened, and the aperture 3 corresponding to the inner frame 31 can be selected accordingly. In some embodiments, the aperture 3 can be made of materials such as stainless steel, aluminum, or titanium alloy, and both surfaces of the aperture 3 are blackened to prevent diffuse reflection of the laser beam 100 on the aperture 3 surface and reduce interference during the transmission of the laser beam 100.

[0064] Among them, the inner frame 31 includes a sawtooth structure 311. In the light intensity distribution of the laser beam 100, it is generally a Gaussian distribution or a super-Gaussian distribution. For the hard-edge aperture 3, the laser beam 100 will have a large high-frequency diffraction after passing through the hard-edge aperture 3. The sawtooth structure 311 in the embodiment of the present invention can effectively reduce Fresnel diffraction, so that the laser beam 100 has a more uniform light intensity distribution.

[0065] It is understandable that the technical solution in the embodiment of the present invention can select an appropriate aperture 3 according to the area to be strengthened, and select an appropriate light intensity shaping device 2 according to the strengthening material properties and strengthening process to adjust the beam intensity distribution.

[0066] In some embodiments, Figure 6 is a schematic structural diagram of a second aperture provided according to an embodiment of the present invention, Figure 7 is a schematic structural diagram of a third type of aperture provided according to an embodiment of the present invention, Figure 8is a schematic structural diagram of a fourth aperture provided according to an embodiment of the present invention, Figures 1 to 8 As shown, the cross-sectional shape of the inner frame 31 is triangular, square, hexagonal or circular.

[0067] Among them, due to the different shapes of the area to be strengthened, different apertures 3 of the inner frame 31 can be used to strengthen the area to be strengthened, such as Figure 6 As shown, the cross-sectional shape of the inner frame 31 may be a triangle; Figure 7 As shown, the cross-sectional shape of the inner frame 31 may be a square; Figure 4 As shown, the cross-sectional shape of the inner frame 31 may be a hexagon; Figure 8 As shown, the cross-sectional shape of the inner frame 31 can be circular, polygonal, or irregular. In order to improve the enhancement quality of the laser beam 100, the cross-sectional shape of the frame is a sawtooth structure 311, thereby achieving the purpose of limiting the spot shape and improving the imaging quality of the laser beam 100.

[0068] The technical solution of the embodiment of the present invention is to provide a light intensity shaping device and an aperture in the beam adjustment device, so that the laser beam can be shaped by the light intensity shaping device, thereby changing the uniformity of the laser beam and improving the strengthening efficiency of the laser beam. At the same time, the shape of the laser beam spot is shaped by the aperture, which solves the problem of poor strengthening effect caused by using the original laser beam when the properties of the material to be strengthened, the area to be strengthened, and the strengthening process are different. At the same time, the sawtooth structure in the aperture can improve the diffraction effect of the laser beam and improve the quality of laser beam strengthening.

[0069] Optional, continue to refer to Figure 1 、 Figure 4 and Figure 5 As shown, the number of sawtooth structures 311 is N, where D is the diameter of the filter aperture, d is the diffraction limit of the laser beam 100, where (Filter aperture not shown in the figure)

[0070] The height of the sawtooth structure 311 is H, where R is the radius of the aperture 3, M is a constant, and M satisfies: 4≤M≤8;

[0071] The radius of the aperture 3 is the radius of the circumscribed circle of the cross-sectional shape of the inner frame 31 .

[0072] The filter aperture can be placed at the focus of the focusing lens in order to improve the beam quality during the transmission of the laser beam 100. The diameter of the filter aperture can be designed and determined according to the quality of the laser beam 100. The number N of the sawtooth structures 311 satisfies D is the diameter of the filter aperture, d is the diffraction limit of the laser beam 100, where

[0073] It is understandable that when the number of sawtooth structures 311 is different, the size of the light spot is different, and the effect of changing the diffraction effect is different. In the embodiment of the present invention, the number N of the sawtooth structures 311 is limited to satisfy With a corresponding number of sawtooth structures 311 , a light spot of this shape and size can improve the diffraction effect to the maximum extent, thereby increasing the quality of the laser beam 100 enhancement. Figure 9 This is a schematic diagram of the adjustment result of the hard-edged circular aperture in the prior art. Figure 10 is a schematic diagram of the adjustment result of the sawtooth diaphragm provided according to an embodiment of the present invention, combined with Figure 9 and Figure 10 It can be seen from the figure that the sawtooth diaphragm has the effect of improving the diffraction effect.

[0074] The height of the sawtooth structure 311 is the tooth height H, and the tooth pitch is s. The tooth height H can also limit the size of the light spot. The radius of the aperture 3 is the radius of the circumscribed circle of the cross-sectional shape of the inner frame 31. For example, when the cross-sectional shape of the inner frame 31 is a hexagon, the radius of the aperture 3 is the radius of the circumscribed circle of the hexagon. The height H of the sawtooth structure 311 satisfies Where R is the radius of the aperture 3, and M is a constant. Experimental verification shows that when M satisfies 4≤M≤8, the diffraction effect of the laser spot is low, thereby improving the imaging quality of the spot.

[0075] For example, if M is set to 6, when the radius R of the aperture 3 is 25 mm, the filter aperture diameter D is 200 μm, and the diffraction limit d of the laser beam 100 is 10 μm, the height H of the sawtooth structure 311 is calculated to be 1.2 mm. The far-field spot of the laser output can be measured using a charge-coupled device, and the filter aperture diameter D can be obtained based on the far-field spot.

[0076] The technical solution of the embodiment of the present invention further improves the diffraction effect of the aperture by limiting the number and height of the sawtooth structure, changes the shape of the light spot, and improves the imaging quality of the laser beam, thereby improving the effect of laser shock peening.

[0077] Optionally, the angle between the plane where the aperture is located and the first plane is a preset angle a, where 0° <a<4°;

[0078] The first plane is perpendicular to the propagation direction of the laser beam.

[0079] Among them, due to the limitations of its own structure, the optical devices in the prior art cannot achieve a 100% high-transmission process. Therefore, in order to improve the transmittance, coating treatment is often carried out on the optical devices. While the coating treatment improves the transmittance of the optical devices, it also increases the reflectivity. Therefore, when the laser beam is incident on the diaphragm with a preset angle of 0°, there will be reflection, and most of the reflected light coincides with the propagation path of the laser beam and propagates in the opposite direction. In this way, the reflected laser beam will re-enter the laser light source. Since the laser beam itself has a certain power, it will cause the devices in the laser light source to be easily damaged.

[0080] In the technical solution of the embodiment of the present invention, by making the included angle between the plane where the diaphragm is located and the first plane be a preset angle of 0° < a < 4°, while ensuring the imaging quality of the laser beam, it is possible to avoid the laser beam entering the laser light source after reflection and damaging the laser light source.

[0081] In some embodiments, the included angle between the plane where the light intensity shaping device is located and the first plane is a preset angle b, where 0° < b < 4°. Similarly, the laser beam enters the laser light source after reflection and damages the laser light source.

[0082] Optionally, the connection line between the optical center of the light intensity shaping device and the center of the diaphragm coincides with the propagation direction of the laser beam.

[0083] In this way, it is ensured that there is no problem of deviation of the light spot adjusted by the light intensity shaping device and the diaphragm, avoiding the problem of light spot deformation caused by non-coaxial setting between optical lenses, reducing the occurrence of diffraction phenomena, and improving the accuracy of laser shock peening.

[0084] Optionally, when the laser beam is a flat-topped super-Gaussian beam, the transmittance T at position A on the light intensity shaping device satisfies

[0085] where T0 is the maximum transmittance of the light intensity shaping device, R is the distance between position A and the center of the circle, and ω is the distance from the center of the circle at the position where T = T0*(1 / e 2 )

[0086] Among them, the Gaussian beam is an electromagnetic wave beam whose irradiance distribution approximately satisfies the Gaussian function, that is, the intensity distribution of the Gaussian beam satisfies that the intensity gradually decreases from the center of the light spot to the edge of the light spot; the flat-topped super-Gaussian beam is a flat-topped beam, that is, the intensity distribution is uniform and the intensity at the center of the light spot remains unchanged from the edge of the light spot.

[0087] Specifically, according to the properties of the material to be strengthened and the area to be strengthened, the super-Gaussian beam can be shaped into a Gaussian beam, and the transmittance T on the light intensity shaping device satisfies where T0 is the maximum transmittance of the light intensity shaping device, R is the distance between position A and the center of the circle, and ω is the distance from the center of the circle at the position where T = T0*(1 / e 2) from the center of the circle. The center of the circle can be the center of the light spot. It is understood that when shaping a super-Gaussian beam into a Gaussian beam, the intensity distribution of the laser beam must satisfy the requirement that the intensity gradually decreases from the center of the light spot to the edge of the light spot. This allows the transmittance distribution on the light intensity shaping device to gradually decrease from the center to the edge of the light intensity shaping device.

[0088] For example, Figure 11 is a structural diagram of a second light intensity shaping device provided according to an embodiment of the present invention, Figure 12 1 is a schematic diagram of energy distribution of a first laser beam before adjustment according to an embodiment of the present invention. Figure 13 This is a schematic diagram of the energy distribution of the first laser beam after adjustment according to an embodiment of the present invention, combined with Figure 11 、 Figure 12 and Figure 13 As shown, a flattened super-Gaussian beam is injected into the beam adjustment device, and the light intensity shaping device 2 shapes the flattened super-Gaussian beam into a Gaussian beam, thereby obtaining a laser output with a light intensity distribution of a Gaussian beam.

[0089] Similarly, when the laser beam is a Gaussian beam, the transmittance T at position A on the light intensity shaping device satisfies

[0090] Where T0 is the maximum transmittance of the light shaping device, R is the distance between position A and the center of the circle, and ω is T=T0*(1 / e 2 ) is the distance from the center of the circle.

[0091] Specifically, the Gaussian beam can be shaped into a flat-top super-Gaussian beam according to the properties of the material to be strengthened and the area to be strengthened. Then the transmittance T on the light intensity shaping device satisfies Where T0 is the maximum transmittance of the light shaping device, R is the distance between position A and the center of the circle, and ω is T=T0*(1 / e 2 ) is the distance from the center of the circle. The center of the circle can be the center of the light spot. It can be understood that, with reference to Figure 3 As shown in the figure, when the Gaussian beam needs to be shaped into a flat-top super-Gaussian beam, the intensity distribution of the laser beam needs to be uniform, so that the transmittance distribution on the light intensity shaping device gradually increases from the center to the edge of the light intensity shaping device to achieve the purpose of uniform light intensity.

[0092] For example, Figure 14 1 is a schematic diagram of energy distribution of a second laser beam before adjustment according to an embodiment of the present invention. Figure 15 is a schematic diagram of energy distribution of the second laser beam after adjustment according to an embodiment of the present invention, combined with Figure 3 、 Figure 7 、 Figure 14 and Figure 15 As shown, a circular Gaussian beam is injected into the beam adjustment device, the light intensity shaping device 2 shapes the Gaussian beam into a flat-top super-Gaussian beam, and the aperture shapes the circular spot into a square, thereby obtaining a laser output with a flat-top super-Gaussian intensity distribution and a square spot shape.

[0093] The technical solution of the embodiment of the present invention uses a formula method to accurately calculate the transmittance of the light intensity shaping device for laser beams with a Gaussian distribution or a flat-top super-Gaussian distribution, thereby completing the design of the light intensity shaping device. For laser beams with other intensity distributions, a charge-coupled device can also be used to detect the intensity distribution of the laser spot, thereby optimizing the formula to achieve the design of the transmittance of different areas on the light intensity shaping device, ultimately achieving the shaping of the laser beam energy distribution.

[0094] Optional, continue to refer to Figure 1 and Figure 2 As shown, the beam adjustment device further includes a focusing lens 4;

[0095] The focusing lens 4 is disposed between the light intensity shaping device 2 and the aperture 3 and is used to adjust the focusing position of the laser beam 100 .

[0096] Among them, the focusing lens 4 can be used to adjust the focusing position of the spot of the laser beam 100 and the working distance of the laser beam 100. Since different focusing lenses 4 have different focal lengths, a focusing lens 4 with a corresponding focal length can be selected according to the position of the area to be strengthened, so that the laser beam 100 passing through the light intensity shaping device 2 is converged to the surface of the area to be strengthened, thereby improving the utilization rate of the laser beam 100.

[0097] In some embodiments, the focusing lens 4 may be made of materials such as diamond or fused quartz, and in order to improve the transmittance of the laser beam 100 , a design of anti-reflection coating on both sides may be adopted.

[0098] Optional, Figure 16 1 is a schematic structural diagram of a lens fixing fixture provided according to an embodiment of the present invention. Figure 17 This is a schematic diagram of the structure of an aperture fixing fixture provided according to an embodiment of the present invention. Figure 1 、 Figure 16 and Figure 17 As shown, the beam adjustment device further includes an external housing 5, a lens fixing fixture 6 and an aperture fixing fixture 7;

[0099] The outer shell 5 includes a receiving space;

[0100] The light intensity shaping device 2 is fixedly embedded in the lens fixing fixture 6 and fixed in the accommodation space by the lens fixing fixture 6;

[0101] The diaphragm 3 is fixedly embedded in the diaphragm fixing fixture 7 and the diaphragm 3 is fixed in the accommodation space by the diaphragm fixing fixture 7 .

[0102] Among them, the external shell 5 can be used as a protective cavity for laser transmission, and the accommodating space is the space of the cavity; the lens fixing fixture 6 is used to fix the light intensity shaping device 2, and the diaphragm fixing fixture 7 is used to fix the diaphragm 3. The lens fixing fixture 6 and the diaphragm fixing fixture 7 are fixed in the accommodating space to realize the assembly of the beam adjustment device.

[0103] Among them, the aperture 3 can be fixedly connected to the aperture fixing fixture 7 by means of threads or optical glue; the light intensity shaping device 2 can be fixedly connected to the lens fixing fixture 6 by means of threads or optical glue; the lens fixing fixture 6 and the aperture fixing fixture 7 can be fixedly connected to the external shell 5 by means of quick-insert screws and positioning pins, which is convenient for replacement when damaged.

[0104] In some embodiments, because the outer housing 5 also protects the laser system, it can be made of materials such as aluminum alloy or stainless steel to further improve the reliability of the beam adjustment device. Additionally, the cavity can be treated with a blackening treatment to suppress diffuse reflection within the cavity and enhance the effectiveness of laser shock peening.

[0105] In some embodiments, the lens fixture 6 and the aperture fixture 7 can both be made of aluminum or stainless steel to improve device reliability. Furthermore, the two fixtures, which serve as connectors between the outer housing 5 and the internal optical components, can be adjusted to improve the utilization of the laser beam 100. For example, the lens fixture 6 with the light intensity shaping device 2 can be tilted, while the aperture fixture 7 with the aperture 3 can be tilted, with the two fixtures positioned at an angle of approximately 2° to 4°, thereby improving the transmission quality of the laser beam 100.

[0106] The technical solution in the embodiment of the present invention realizes protection of the beam shaping device and the diaphragm 3 by providing a lens fixing fixture 6 and an aperture fixing fixture 7 in the beam adjusting device, and arranging the lens fixing fixture 6 and the aperture fixing fixture 7 in the external housing 5, making the entire beam adjusting device more integrated and the structure more compact.

[0107] Optional, continue to refer to Figure 1 and Figure 2 As shown, the light beam adjustment device further includes a protective window 8;

[0108] The protection window 8 is fixedly arranged in the accommodating space and disposed between the light intensity shaping device 2 and the aperture 3 .

[0109] The protective window 8 in the outer housing 5 serves to prevent dust from entering the beam adjustment device. In some embodiments, the protective window 8 can be secured to the outer housing 5 using threads or optical adhesive. The technical solution of the embodiments of the present invention, by providing the protective window 8 in the beam adjustment device, prevents damage to the optical components of the beam adjustment device caused by dust during the output of the high-energy laser beam 100, thereby improving the reliability of the beam adjustment device.

[0110] In some embodiments, the outer housing 5 further includes an air nozzle 9 and a laser nozzle 10, both of which are threadably connected to the outer housing 5. The air nozzle 9 is connected to the receiving space, and by filling the air nozzle 9 with positive pressure air, dust in the receiving space can be removed, thereby improving the anti-interference performance of the laser beam 100 during transmission. The laser nozzle 10 can be used to emit the laser beam 100, so the through hole of the laser nozzle 10 is positioned along the propagation path of the laser beam 100. By adjusting the relative position of the laser nozzle 100 and the area to be strengthened, the diameter of the laser beam 100 can be fine-tuned.

[0111] Exemplarily, the working process of the beam adjustment device can be described as follows:

[0112] The laser beam 100 is injected from one side of the outer shell 5 and is shaped by the light intensity shaping device 2 to achieve beam intensity shaping. The shaped laser beam 100 is focused by the focusing lens 4. The focused laser beam 100 passes through the protective window 8 and enters the aperture 3, where the spot of the laser beam 100 is shaped. Finally, the laser beam 100 is emitted through the laser nozzle 10 to the area to be strengthened, thereby achieving adjustment of the laser beam 100.

[0113] The technical solutions in the embodiments of the present invention can simultaneously shape both the laser beam intensity and the laser beam spot shape. Furthermore, they effectively protect the laser transmission system and the laser beam's focus position, reduce diffraction effects caused by optical components, and improve the quality of the laser beam output. Furthermore, the technical solutions in the embodiments of the present invention reduce the size of the entire multi-dimensional parameter beam adjustment device, making it more compact.

[0114] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A light beam adjustment device, characterized in that: include: Laser light sources, light intensity shaping devices and apertures; The laser light source is used to emit a laser beam; The light intensity shaping device is arranged on the propagation path of the laser beam and is used to adjust the light intensity of the laser beam; The aperture is arranged on the propagation path of the adjusted laser beam and is used to adjust the spot shape of the laser beam; The aperture is an annular aperture including an inner frame; The inner frame includes a serrated structure.

2. The light beam adjustment device according to claim 1, wherein: The number of the sawtooth structures is N, where D is the diameter of the filter aperture, d is the diffraction limit of the laser beam, where The height of the sawtooth structure is H, where R is the radius of the aperture, M is a constant, and M satisfies: 4≤M≤8; The radius of the aperture is the radius of the circumscribed circle of the cross-sectional shape of the inner frame.

3. The light beam adjustment device according to claim 1, wherein: The cross-sectional shape of the inner frame is a triangle, a square, a hexagon or a circle.

4. The light beam adjustment device according to claim 1, wherein: The angle between the plane where the aperture is located and the first plane is a preset angle a, where 0° <a<4°; The first plane is perpendicular to a propagation direction of the laser beam.

5. The light beam adjustment device according to claim 1, wherein: The connecting line between the optical center of the light intensity shaping device and the center of the aperture coincides with the propagation direction of the laser beam.

6. The light beam adjustment device according to claim 1, wherein: When the laser beam is a flat-top super-Gaussian beam, the transmittance T at position A on the light intensity shaping device satisfies Wherein, T0 is the maximum transmittance of the light intensity shaping device, R is the distance between position A and the center of the circle, and ω is T=T0*(1 / e 2 ) is the distance from the center of the circle.

7. The light beam adjustment device according to claim 1, wherein: When the laser beam is a Gaussian beam, the transmittance T at position A on the light intensity shaping device satisfies Wherein, T0 is the maximum transmittance of the light intensity shaping device, R is the distance between position A and the center of the circle, and ω is T=T0*(1 / e 2 ) is the distance from the center of the circle.

8. The light beam adjustment device according to claim 1, wherein: The beam adjustment device further includes a focusing lens; The focusing lens is arranged between the light intensity shaping device and the aperture, and is used to adjust the focusing position of the laser beam.

9. The light beam adjustment device according to claim 1, wherein: The beam adjustment device further includes an external housing, a lens fixing fixture and an aperture fixing fixture; The outer shell includes a receiving space; The light intensity shaping device is fixedly embedded in the lens fixing fixture and is fixed in the accommodating space through the lens fixing fixture; The diaphragm is fixedly embedded in the diaphragm fixing fixture and the diaphragm is fixed in the accommodating space through the diaphragm fixing fixture.

10. The light beam adjustment device according to claim 9, wherein: The light beam adjustment device further includes a protective window; The protection window is fixedly arranged in the accommodating space and is arranged between the light intensity shaping device and the aperture.

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