Laser splitting device and laser processing system
By using prisms and driving devices in the laser spectroscopy device to adjust the polarization direction of linearly polarized light, and combining with the spectroscopy to achieve beam power adjustment of transmitted light and reflected light, the problem of inability to adjust the beam power in the prior art is solved, and the quality and efficiency of laser processing are improved.
Patent Information
- Application Number
- CN202422195014.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-06
AI Technical Summary
Existing spectroscopy cannot arbitrarily adjust the beam power of reflected and transmitted light, affecting the quality and efficiency of laser processing.
A laser spectroscopy device composed of a prism and a driving device is used to adjust the polarization direction of linearly polarized light by changing the base axis direction of the prism, and combine the spectroscopy to achieve beam power adjustment of transmitted light and reflected light.
The reflected light and transmitted light are output in any proportion, ensuring the consistency of the quality and efficiency of laser processing, and reducing laser energy loss.
Smart Images
Figure CN223193219U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of laser processing, in particular to a laser spectrometer and a laser processing system. Background Art
[0002] CO2 lasers are widely used in materials processing, serving as light sources for automated equipment such as marking, sheet metal cutting, and PCB drilling. With advancements in CO2 laser technology, PCB drilling equipment is adopting a single laser to achieve dual-axis processing through beam splitting to maximize efficiency and reduce costs. Conventional beam splitters split a single beam into two. This method of beam splitting cannot arbitrarily adjust the power of the reflected and transmitted light, thus affecting laser processing quality and efficiency. Utility Model Content
[0003] The purpose of the utility model is to propose a laser spectrometer and a laser processing system, which aims to solve the problem that the existing spectrometer method uses a spectroscope to split a beam of light into two beams, and the beam power of the reflected light and the transmitted light cannot be arbitrarily adjusted, thereby affecting the quality and efficiency of laser processing.
[0004] In a first aspect, the present invention provides a laser spectrometer, comprising:
[0005] a prism, the prism being used to receive linearly polarized light in an initial state and output the linearly polarized light after changing its linear polarization direction;
[0006] a driving device, the driving device being in driving connection with the prism and configured to drive the prism to move so as to change the direction of the base axis of the prism; and
[0007] The beam splitter is used to receive the linearly polarized light output by the prism and split the linearly polarized light into transmitted light and reflected light.
[0008] In one embodiment, the polarization direction of the linearly polarized light in the initial state is a first polarization direction, the light intensity is I, the prism has a base axis direction, and the angle between the first polarization direction and the base axis direction is α;
[0009] The prism changes the linear polarization direction of the linearly polarized light to form a second polarization direction, and the angle between the second polarization direction and the first polarization direction is 2α;
[0010] The incident angle of the linearly polarized light emitted to the beam splitter is 45°, and the intensity of the reflected light is Icos 2 2α, the intensity of the transmitted light is Isin 2 2α, the reflective splitting ratio is: cot 2 2α.
[0011] In one embodiment, the driving device is a rotation driving assembly, which is in transmission connection with the prism and is used to drive the prism to rotate so as to change the direction of the base axis of the prism.
[0012] In one embodiment, the prism is a rhombus, and the rhombus has a first face, a second face arranged at an angle to the first face, a third face parallel to the second face, and a fourth face arranged at an angle to the third face;
[0013] The linearly polarized light in the initial state is vertically incident on the rhombus from the first surface, the linearly polarized light can be totally reflected on the second surface toward the third surface, the linearly polarized light can be totally reflected on the third surface toward the fourth surface, and vertically emitted from the fourth surface to the outside of the rhombus.
[0014] In one embodiment, the second surface and the third surface are both coated with a total reflection film.
[0015] In one embodiment, the prism is a half-wave Fresnel rhombus.
[0016] In one embodiment, the beam splitter is a polarization beam splitter.
[0017] In one embodiment, the polarization beam splitter is a TFP beam splitter made of a ZnSe substrate. In a second aspect, the utility model further provides a laser processing system, the laser processing system comprising:
[0018] Laser; the laser is used to generate linearly polarized light in an initial state, and
[0019] In the laser spectrometer of any of the above embodiments, the prism is used to receive linearly polarized light in an initial state.
[0020] In one embodiment, the laser is a carbon dioxide laser.
[0021] The following beneficial effects are achieved by adopting the embodiments of the present invention:
[0022] With the laser spectrometer and laser processing system of the present invention, the prism can change the linear polarization direction of linearly polarized light and then output it; the spectrometer can receive the linear polarized light output by the prism and split the linear polarized light into transmitted light and reflected light; the driving device drives the prism to move and can change the base axis direction of the prism to arbitrarily adjust the linear polarization direction of the linear polarized light. Through such an arrangement, the prism can adjust the linear polarization direction of the linear polarized light, and the spectrometer characteristics of the spectrometer for linear polarized light with different polarization directions are used to adjust the beam power of the transmitted light and the reflected light, thereby ensuring the quality and efficiency of laser processing. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying any creative work.
[0024] in:
[0025] Figure 1 Schematic diagram of the principle of a laser processing system in one embodiment.
[0026] Figure 2 Schematic diagram of the optical path of a laser processing system in one embodiment.
[0027] Figure 3 for Figure 2 Schematic diagram of the optical path at the prism in the laser processing system shown.
[0028] Figure 4 for Figure 3 Enlarged schematic diagram of part A in the middle.
[0029] Reference numerals: 10, linearly polarized light; 10a, first polarization direction; 10b, second polarization direction; 11, reflected light; 11a, polarization direction of reflected light; 12, transmitted light; 12a, polarization direction of transmitted light;
[0030] 100. Laser; 200. Prism; 210. First surface; 220. Second surface; 230. Third surface; 240. Fourth surface; 250. Base axis direction; 300. Spectrometer. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.
[0032] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0033] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of the aforementioned features. In addition, the technical solutions between the various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.
[0034] This utility model also provides a laser processing system, which is mainly used for laser marking, sheet metal cutting, laser drilling and other processing. Figures 1 to 4 A laser processing system according to an embodiment includes a laser 100 and a laser spectrometer. The laser 100 serves as a light source for generating linearly polarized light 10 in an initial state. The laser spectrometer includes a prism 200, a driving device (not shown in the figure) and a spectrometer 300. The prism 200 is used to receive the linearly polarized light 10 in an initial state, change the linear polarization direction of the linearly polarized light 10 and output it; the driving device is in transmission connection with the prism 200 and is used to drive the prism 200 to move so as to change the base axis direction 250 of the prism 200 so as to arbitrarily adjust the linear polarization direction of the linearly polarized light 10; the spectrometer 300 is used to receive the linearly polarized light 10 output by the prism 200 and split the linearly polarized light 10 into transmitted light 12 and reflected light 11.
[0035] It can be understood that since the prism 200 can adjust the linear polarization direction of the linearly polarized light 10, the beam power of the transmitted light 12 and the reflected light 11 can be adjusted by utilizing the spectroscopic characteristics of the spectroscope 300 for linearly polarized light 10 with different polarization directions, thereby ensuring the quality and efficiency of laser processing.
[0036] In one embodiment, see Figures 1 to 4 By using the prism 200 to adjust the linear polarization direction of the linearly polarized light 10, the reflected light 11 and the transmitted light 12 can be output in any proportion without wasting laser energy. Furthermore, the energy power of the reflected light 11 can be consistent with the energy power of the transmitted light 12, thereby ensuring the consistency of the laser processing quality during dual-axis processing.
[0037] In one embodiment, see Figures 1 to 4Prism 200 is a half-wave Fresnel rhomb. A half-wave Fresnel rhomb is a ZnSe-based prism with fixed angles between its surfaces. A laser beam incident normally on its incident surface is totally reflected at the inclined surface, and the laser beam is output perpendicular to the exit surface. The transmittance of the half-wave Fresnel rhomb is ≥96%. Using the half-wave Fresnel rhomb to rotate and change the linear polarization direction of linearly polarized light 10 reduces beam energy loss.
[0038] Furthermore, in this embodiment, the beam splitter 300 is a polarizing beam splitter. Specifically, the polarizing beam splitter can be a TFP (Thin Film Polarizer) beam splitter. The reflectivity of the TFP beam splitter for the reflected light 11 is not less than 96%, and the transmittance of the transmitted light 12 is not less than 96%. The use of a TFP beam splitter reduces beam energy loss. Specifically, to ensure the durability of the TFP beam splitter, the polarizing beam splitter is made of a ZnSe substrate, which can withstand high laser power.
[0039] In this embodiment, a half-wave Fresnel rhombus is used to change the polarization state of light incident on the TFP beam splitter, and the TFP beam splitter is used to achieve beam splitting, thereby realizing an energy-adjustable beam splitting method.
[0040] Specifically, the linearly polarized light 10 generated by the laser 100 is normally incident on the half-wave Fresnel rhombus. After the polarization direction of the linearly polarized light 10 is rotated by the half-wave Fresnel rhombus, the polarization direction of the linearly polarized light 10 emitted from the half-wave Fresnel rhombus is rotated and changed. The linearly polarized light 10 with the changed polarization direction is incident on the TFP beam splitter at a 45° angle of incidence and is split by the TFP beam splitter into two beams of linearly polarized light, namely reflected light 11 and transmitted light 12. Through such a setting, the half-wave Fresnel rhombus can adjust the linear polarization direction of the linearly polarized light 10. The TFP beam splitter's splitting characteristics for linearly polarized light 10 with different polarization directions are used to adjust the beam power of the transmitted light 12 and the reflected light 11, thereby ensuring the quality and efficiency of laser processing.
[0041] In one embodiment, see Figures 1 to 4 In the initial state, the polarization direction of the linearly polarized light 10 is the first polarization direction 10a, and the light intensity is I. The prism 200 has a base axis direction 250, and the angle between the first polarization direction 10a and the base axis direction 250 is α; the prism 200 changes the linear polarization direction of the linearly polarized light 10 to form a second polarization direction 10b, and the angle between the second polarization direction 10b and the first polarization direction 10a is 2α; the incident angle of the linearly polarized light 10 emitted to the beam splitter 300 is 45°, and the intensity of the reflected light 11 is Icos 22α, the intensity of the transmitted light 12 is Isin 2 2α, the reflective splitting ratio is: cot 2 2α.
[0042] With this configuration, by varying the angle α between the first polarization direction 10a and the base axis direction 250, the corresponding continuous variation of the reflective / transmissive splitting ratio can be achieved, enabling the output of reflected light 11 and transmitted light 12 in any ratio. Furthermore, when α = 22.5°, the intensity energy of reflected light 11 is consistent with the intensity energy of transmitted light 12, achieving uniform light splitting by the beam splitter 300.
[0043] In this example, see Figure 2 , the reflected light polarization direction 11a of the reflected light 11 and the transmitted light polarization direction 12a of the transmitted light 12 are different.
[0044] In one embodiment, see Figures 1 to 4 The driving device is a rotation driving assembly, which is in transmission connection with the prism 200 and is used to drive the prism 200 to rotate to change the base axis direction 250 of the prism 200.
[0045] Furthermore, in this embodiment, the prism 200 is a rhombus, which has a first surface 210, a second surface 220 set at an angle to the first surface 210, a third surface 230 parallel to the second surface 220, and a fourth surface 240 set at an angle to the third surface 230.
[0046] Initially, linearly polarized light 10 is perpendicularly incident on the rhombus from the first surface 210. It is then totally reflected off the second surface 220 toward the third surface 230. Subsequently, the linearly polarized light 10 is also totally reflected off the third surface 230 toward the fourth surface 240, exiting perpendicularly from the fourth surface 240 to the exterior of the rhombus. This arrangement changes the linear polarization direction of the linearly polarized light 10 through the rhombus. Furthermore, both the second surface 220 and the third surface 230 are coated with a total reflection coating, ensuring minimal energy loss within the rhombus, resulting in a transmittance of ≥96%.
[0047] In a more specific embodiment, see Figures 2 to 4Assume that the linearly polarized light 10 in the initial state is normally incident on the first surface 210 of the rhombus. After passing through the first surface 210, the linearly polarized light 10 propagates within the rhombus and reaches the second surface 220 at an incident angle θ=33.34°. The linearly polarized light 10 can be totally reflected at the second surface 220. The angle between the first surface 210 and the third surface 230 is 32.87°. The third surface 230 and the second surface 220 are parallel to each other. The linearly polarized light 10 can also be totally reflected at the third surface 230, and the propagation direction is perpendicular to the fourth surface 240. In this way, the linearly polarized light 10 emitted from the rhombus is parallel to the linear polarized light 10 incident from the rhombus, and has a certain displacement. Specifically, the displacement can be selected as 25.4 mm.
[0048] Furthermore, both the second surface 220 and the third surface 230 are coated with a dielectric film, which enables the linearly polarized light 10 to be totally reflected on the second surface 220 and the third surface 230 when the incident angle θ of the linearly polarized light 10 is greater than the critical angle.
[0049] In one embodiment, the laser 100 is a carbon dioxide laser 100. Since the wavelength of the linearly polarized light 10 generated by the carbon dioxide laser 100 is relatively special and the cost of a prism based on ZnSe material is relatively low, a prism is selected to change the linear polarization direction of the linearly polarized light 10.
[0050] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.
Claims
1. A laser spectrometer, characterized in that: The laser spectrometer comprises: a prism, the prism being used to receive linearly polarized light in an initial state and output the linearly polarized light after changing its linear polarization direction; a driving device, the driving device being in driving connection with the prism and configured to drive the prism to move so as to change the direction of the base axis of the prism; and The beam splitter is used to receive the linearly polarized light output by the prism and split the linearly polarized light into transmitted light and reflected light.
2. The laser spectrometer according to claim 1, wherein: The polarization direction of the linearly polarized light in the initial state is a first polarization direction, the light intensity is I, the prism has a base axis direction, and the angle between the first polarization direction and the base axis direction is α; The prism changes the linear polarization direction of the linearly polarized light to form a second polarization direction, and the angle between the second polarization direction and the first polarization direction is 2α; The incident angle of the linearly polarized light emitted to the beam splitter is 45°, and the intensity of the reflected light is Icos 2 2α, the intensity of the transmitted light is Isin 2 2α, the reflective splitting ratio is: cot 2 2α.
3. The laser spectrometer according to claim 2, wherein: The driving device is a rotation driving assembly, which is in transmission connection with the prism and is used to drive the prism to rotate so as to change the direction of the base axis of the prism.
4. The laser spectrometer according to claim 1, wherein: The prism is a rhombus, and the rhombus has a first surface, a second surface arranged at an angle to the first surface, a third surface parallel to the second surface, and a fourth surface arranged at an angle to the third surface; The linearly polarized light in the initial state is vertically incident on the rhombus from the first surface, the linearly polarized light can be totally reflected on the second surface toward the third surface, the linearly polarized light can be totally reflected on the third surface toward the fourth surface, and vertically emitted from the fourth surface to the outside of the rhombus.
5. The laser spectrometer according to claim 4, wherein: The second surface and the third surface are both coated with a total reflection film.
6. The laser spectrometer according to claim 1, wherein: The prism is a half-wave Fresnel rhombus.
7. The laser spectrometer according to claim 1, wherein: The beam splitter is a polarization beam splitter.
8. The laser spectrometer according to claim 7, wherein: The polarization beam splitter is a TFP beam splitter made of a ZnSe substrate.
9. A laser processing system, characterized in that: The laser processing system comprises: Laser; the laser is used to generate linearly polarized light in an initial state, and The laser spectrometer according to any one of claims 1 to 8, wherein the prism is used to receive linearly polarized light in an initial state.
10. The laser processing system according to claim 9, characterized in that: The laser is a carbon dioxide laser.