A multi-wavelength laser

Abstract

The utility model relates to a kind of multi-wavelength laser, including laser light source and the first combination mirror group, second combination mirror group and laser separation mirror group sequentially arranged on the light path of laser light emitted by the laser light source, single-wavelength laser emitted by the laser light source can form double-wavelength composite light after passing through the first combination mirror group, double-wavelength composite light can form three-wavelength composite light after passing through the second combination mirror group, and the laser separation mirror group includes three beam splitters, each of the beam splitters can receive multi-wavelength composite light and separate output corresponding single-wavelength laser, each of the beam splitters is reciprocatingly arranged, and the moving path passes through the light path of laser light emitted by the laser light source. The multi-wavelength laser provided by the utility model solves the problem of low processing efficiency of existing laser when processing composite material workpieces.

Description

Technical Field

[0001] This utility model relates to the field of laser technology, and in particular to a multi-wavelength laser. Background Technology

[0002] Because different materials have different absorption characteristics for different wavelengths of laser light, when processing some composite material workpieces, it is necessary to use lasers of different wavelengths to process different material layers of the workpiece. Existing lasers generally select to change laser sources of different wavelengths to emit laser light of different wavelengths. This requires changing the laser source multiple times to process a composite material workpiece. Moreover, the position of the emitted laser will also change after changing the laser source, which requires time to perform position correction, resulting in low processing efficiency. Utility Model Content

[0003] The main purpose of this invention is to propose a multi-wavelength laser, which aims to solve the problem of low processing efficiency of existing lasers when processing composite material workpieces.

[0004] To achieve the above objectives, this utility model proposes a multi-wavelength laser, comprising a laser source and a first combined mirror group, a second combined mirror group, and a laser splitter mirror group sequentially arranged on the optical path from which the laser light is emitted. The single-wavelength laser emitted from the laser source can form a dual-wavelength composite light after passing through the first combined mirror group, and the dual-wavelength composite light can form a tri-wavelength composite light after passing through the second combined mirror group. The laser splitter mirror group includes three beam splitters, each of which can receive the multi-wavelength composite light and separate and output the corresponding single-wavelength laser light. Each beam splitter is reciprocating, and its movement path passes through the optical path from which the laser light is emitted.

[0005] According to some embodiments of the present invention, the laser source emits infrared laser with a wavelength of 1064nm.

[0006] According to some embodiments of this utility model, the laser source emits laser M 2 ≤1.3.

[0007] According to some embodiments of the present invention, the first combined mirror group includes a first half-wave plate and a frequency-doubled crystal through which a horizontally polarized 1064nm infrared laser can pass to generate a vertically polarized 532nm green laser. The first half-wave plate is a 1064nm single-wavelength wave plate, and the first half-wave plate is rotatably arranged around a first axis. The extension direction of the first axis is perpendicular to the optical path direction of the laser emitted by the laser source.

[0008] According to some embodiments of the present invention, the second combined mirror group includes a second half-wave plate and a third-harmonic crystal that allows horizontally polarized 1064nm infrared laser and vertically polarized 532nm green laser to pass through simultaneously to generate vertically polarized 355nm ultraviolet laser. The second half-wave plate is a 1064nm & 532nm dual-wavelength wave plate, and the second half-wave plate is rotatably arranged around a second axis. The extension direction of the second axis is perpendicular to the optical path direction of the laser emitted by the laser source.

[0009] According to some embodiments of the present invention, it further includes a first driving unit and a second driving unit. The first driving unit is driven to connect with the first half-wave plate, and the first half-wave plate is driven to rotate around a first axis by the first driving unit. The second driving unit is driven to connect with the second half-wave plate, and the second half-wave plate is driven to rotate around a second axis by the second driving unit.

[0010] According to some embodiments of this utility model, the three beam splitters include:

[0011] A first beam splitter through which infrared lasers can pass;

[0012] A second beam splitter that can reflect infrared laser light and allow green laser light to pass through; and,

[0013] A third beam splitter that can reflect infrared and green laser light and allow ultraviolet laser light to pass through, wherein the first, second and third beam splitters can all be reciprocated and the direction of movement is perpendicular to the light path direction of the laser emitted from the laser source.

[0014] According to some embodiments of the present invention, the thickness of the first beam splitter is 5 mm, the thickness of the second beam splitter is 5.05 mm, and the thickness of the third beam splitter is 5.10 mm.

[0015] According to some embodiments of this utility model, it also includes an electric displacement platform. The first beam splitter, the second beam splitter, and the third beam splitter are all disposed on the electric displacement platform. The first beam splitter, the second beam splitter, and the third beam splitter are respectively driven by the electric displacement platform to reciprocate, and the direction of movement is perpendicular to the light path direction of the laser emitted by the laser source.

[0016] According to some embodiments of the present invention, it further includes an absorption section capable of absorbing stray light, the absorption section being located in the optical path of the laser separation mirror group for filtering stray light.

[0017] This utility model has at least the following beneficial effects:

[0018] In this invention, the single-wavelength laser emitted from the laser source forms a dual-wavelength composite light after passing through the first combined mirror group. This dual-wavelength composite light continues along the optical path and forms a three-wavelength composite light after passing through the second combined mirror group. Based on the laser required for the current material layer of the workpiece, the corresponding beam splitter is moved to the optical path of the laser emitted from the laser source, causing the composite light to pass through the beam splitter and be separated into corresponding single-wavelength lasers. This invention, by driving different beam splitters to move to the optical path of the laser emitted from the laser source to output lasers of different wavelengths, processes different material layers of composite workpieces without needing to change the laser source or correct the position of the emitted laser, reducing the time spent adjusting the output laser wavelength and thus improving processing efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a multi-wavelength laser provided for an embodiment of this utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of a multi-wavelength laser outputting 1064nm infrared laser;

[0022] Figure 3 for Figure 1 A schematic diagram of a multi-wavelength laser outputting 532nm green laser light;

[0023] Figure 4 for Figure 1 A schematic diagram of a multi-wavelength laser outputting 355nm ultraviolet laser.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100 - Multi-wavelength laser; 1 - Laser source; 2 - First combined mirror group; 21 - First half-wave plate; 22 - Second harmonic crystal; 3 - Second combined mirror group; 31 - Second half-wave plate; 32 - Third harmonic crystal; 4 - Laser splitting mirror group; 41 - First beam splitter; 42 - Second beam splitter; 43 - Third beam splitter; 5 - Absorption section. Detailed Implementation

[0026] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] This invention provides a multi-wavelength laser. Figures 1 to 4 This invention provides a specific embodiment of a multi-wavelength laser.

[0030] like Figure 1 As shown, this utility model embodiment provides a multi-wavelength laser, including a laser source 1 and a first combined mirror group 2, a second combined mirror group 3, and a laser splitter group 4 sequentially arranged on the optical path of the laser emitted from the laser source 1. The single-wavelength laser emitted from the laser source 1 can form a dual-wavelength composite light after passing through the first combined mirror group 2, and the dual-wavelength composite light can form a tri-wavelength composite light after passing through the second combined mirror group 3. The laser splitter group 4 includes three beam splitters, each of which can receive the multi-wavelength composite light and separate and output the corresponding single-wavelength laser. Each beam splitter is reciprocating and its movement path passes through the optical path of the laser emitted from the laser source 1.

[0031] In this invention, the single-wavelength laser emitted from the laser source 1 forms a dual-wavelength composite light after passing through the first combined mirror group 2. This dual-wavelength composite light continues along the optical path and forms a three-wavelength composite light after passing through the second combined mirror group 3. Based on the laser required for the current material layer of the workpiece, the corresponding beam splitter is moved to the optical path of the laser emitted from the laser source 1, causing the composite light to pass through the beam splitter and be separated to output the corresponding single-wavelength laser. This invention, by driving different beam splitters to move to the optical path of the laser emitted from the laser source 1 to output lasers of different wavelengths, processes different material layers of composite workpieces without needing to change the laser source 1 or correct the position of the emitted laser, reducing the time spent adjusting the output laser wavelength and thus improving processing efficiency.

[0032] It should be noted that the laser source 1 emits infrared laser light with a wavelength of 1064nm. Infrared laser light has a high conversion efficiency when converted to other wavelengths, and it also has a longer lifespan, making it suitable for industrial applications.

[0033] Preferably, in some embodiments, the laser emitted by the laser source 1 has an M2 ≤ 1.3. The lower the M2, the smaller the beam divergence angle, the smaller the focused spot, and the higher the beam quality, thereby improving the processing accuracy of the laser.

[0034] In some embodiments, such as Figure 1 and Figure 2 As shown, the first combined mirror group 2 includes a first half-wave plate 21 and a frequency-doubled crystal 22 through which a horizontally polarized 1064nm infrared laser is passed to generate a vertically polarized 532nm green laser. The first half-wave plate 21 is a 1064nm single-wavelength wave plate, and the first half-wave plate 21 is rotatably arranged around a first axis, the extension direction of which is perpendicular to the optical path direction of the laser emitted from the laser source 1. Since the half-wave plate can adjust the polarization direction of the incident laser, when the laser passes through the half-wave plate, the polarization direction of the emitted light rotates by 2θ relative to the polarization direction of the incident light, where θ is the angle between the incident light direction and the optical axis of the half-wave plate.

[0035] Specifically, the second harmonic crystal 22 is a phase-matched LBO crystal.

[0036] Furthermore, in some embodiments, such as Figure 1 and Figure 3As shown, the second combined mirror group 3 includes a second half-wave plate 31 and a third-harmonic crystal 32 that allows horizontally polarized 1064nm infrared laser and vertically polarized 532nm green laser to pass through simultaneously to generate vertically polarized 355nm ultraviolet laser. The second half-wave plate 31 is a 1064nm & 532nm dual-wave plate. The second half-wave plate 31 is rotatably arranged around a second axis, and the extension direction of the second axis is perpendicular to the optical path direction of the laser emitted by the laser source 1.

[0037] Specifically, the third harmonic crystal 32 is a type II phase-matched LBO crystal.

[0038] In some embodiments, the multi-wavelength laser 100 further includes a first driving unit and a second driving unit. The first driving unit is driven to rotate the first half-wave plate 21 around a first axis by the first driving unit. The second driving unit is driven to rotate the second half-wave plate 31 around a second axis by the second driving unit. This configuration, by driving the first half-wave plate 21 and the second half-wave plate 31 to rotate via the driving components, provides more precise angle adjustment and higher adjustment efficiency compared to manual driving.

[0039] Furthermore, in some embodiments, such as Figures 1 to 4 As shown, the three beam splitters include a first beam splitter 41 through which infrared laser light passes, a second beam splitter 42 that reflects infrared laser light and allows green laser light to pass through, and a third beam splitter 43 that reflects both infrared and green laser light and allows ultraviolet laser light to pass through. The first beam splitter 41, the second beam splitter 42, and the third beam splitter 43 are all reciprocating, and their direction of movement is perpendicular to the optical path of the laser emitted from the laser source 1. This arrangement, because the direction of movement of each beam splitter is perpendicular to the optical path of the laser emitted from the laser source 1, shortens the path of movement of each beam splitter away from the optical path, reducing the time required to move each beam splitter and thus improving the efficiency of wavelength adjustment.

[0040] Specifically, in some embodiments, the thickness of the first beam splitter 41 is 5 mm, the thickness of the second beam splitter 42 is 5.05 mm, and the thickness of the third beam splitter 43 is 5.10 mm. This configuration, through precise thickness gradient compensation for the optical path difference of different wavelengths, ultimately achieves strictly coaxial output of the 1064 nm infrared laser, 532 nm green laser, and 355 nm ultraviolet laser. This ensures that the machining point on the workpiece remains unchanged after adjusting the laser wavelength, thereby reducing machining errors and improving machining accuracy.

[0041] Furthermore, in some embodiments, the multi-wavelength laser 100 further includes an electrically driven displacement platform. The first beam splitter 41, the second beam splitter 42, and the third beam splitter 43 are all disposed on the electrically driven displacement platform. The first beam splitter 41, the second beam splitter 42, and the third beam splitter 43 are respectively driven to reciprocate by the electrically driven displacement platform, and the direction of movement is perpendicular to the optical path direction of the laser emitted from the laser source 1. This configuration, by using electric drive instead of manual drive, achieves higher efficiency.

[0042] In some embodiments, such as Figure 3 and Figure 4 As shown, the multi-wavelength laser 100 also includes an absorption section 5 for absorbing stray light, which is located in the optical path of the laser separation mirror group 4 for filtering stray light. This arrangement allows the filtered stray light to be absorbed by the absorption section 5, preventing stray light from interfering with the laser processing of the workpiece.

[0043] Specifically, the absorption section 5 can be an absorption cylinder or other components known to those skilled in the art that can absorb stray light.

[0044] like Figure 2 As shown, when a 1064nm infrared laser needs to be output, the first half-wave plate 21 is driven to rotate, setting θ = 45°, while the second half-wave plate 31 is set to θ = 0°. The second beam splitter 42 and the third beam splitter 43 are then moved out of the optical path. At this time, the laser source 1 emits a horizontally polarized 1064nm infrared laser. After passing through the first half-wave plate 21, the horizontally polarized infrared laser becomes a vertically polarized infrared laser. Since the second-harmonic crystal 22 can only cause the horizontally polarized 1064nm infrared laser to pass through… The vertically polarized 532nm green laser is then generated. The vertically polarized infrared laser does not change after passing through the second harmonic crystal 22. Similarly, the second half-wave plate 31 with θ=0° and the third harmonic crystal 32 do not cause any change in the vertically polarized infrared laser. Therefore, the vertically polarized infrared laser passes through the second harmonic crystal 22, the second half-wave plate 31 and the third harmonic crystal 32 in sequence. At the same time, since the first beam splitter 41 allows the infrared laser to pass through, the vertically polarized infrared laser is normally output from the first beam splitter 41.

[0045] like Figure 3As shown, when a 532nm green laser is needed, the first half-wave plate 21 is set to 0°, while the second half-wave plate 31 is rotated to 45°. The first beam splitter 41 and the third beam splitter 43 are then moved out of the optical path. At this time, the laser source 1 emits a horizontally polarized 1064nm infrared laser. This horizontally polarized infrared laser does not change after passing through the first half-wave plate 21. After passing through the frequency-doubled crystal 22, part of the horizontally polarized 1064nm infrared laser becomes a vertically polarized 532nm green laser. The two wavelengths of laser light mix to form a dual-wavelength composite light. The composite light of a horizontally polarized 1064nm infrared laser and a vertically polarized 532nm green laser becomes a composite light of a vertically polarized 1064nm infrared laser and a horizontally polarized 532nm green laser after passing through the second half-wave plate 31. Since the polarization directions of the dual-wavelength composite light are mismatched, it does not change after passing through the third-harmonic crystal 32. Because the second beam splitter 42 can reflect the infrared laser and allow the green laser to pass through, the dual-wavelength composite light outputs a horizontally polarized 532nm green laser after passing through the second beam splitter 42, while the vertically polarized 1064nm infrared laser is absorbed by the absorption section 5 after reflection.

[0046] like Figure 4 As shown, when a 355nm ultraviolet laser needs to be output, the first half-wave plate 21 and the second half-wave plate 31 are set to θ=0°, and the first beam splitter 41 and the second beam splitter 42 are moved out of the optical path. At this time, the laser source 1 emits a horizontally polarized 1064nm infrared laser. The horizontally polarized infrared laser does not change after passing through the first half-wave plate 21. After passing through the second-harmonic crystal 22, part of the horizontally polarized 1064nm infrared laser becomes a vertically polarized 532nm green laser. The two wavelengths of laser light mix to form a dual-wavelength composite light. The dual-wavelength composite light passes through the... After the second half-wave plate 31, no change occurs. Then, part of the horizontally polarized 1064nm infrared laser and the vertically polarized 532nm green laser pass through the third-harmonic crystal 32 and become a vertically polarized 355nm ultraviolet laser. The three wavelengths of laser light are mixed to form a three-wavelength composite light. Since the third beam splitter 43 can reflect the infrared laser and the green laser and allow the ultraviolet laser to pass through, the three-wavelength composite light outputs a vertically polarized 355nm ultraviolet laser after passing through the third beam splitter 43, while the horizontally polarized 1064nm infrared laser and the vertically polarized 532nm green laser are absorbed by the absorption section 5 after reflection.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-wavelength laser, characterized in that, The system includes a laser source and a first combined mirror group, a second combined mirror group, and a laser splitter mirror group arranged sequentially along the optical path from which the laser light is emitted. The single-wavelength laser light emitted from the laser source can form a dual-wavelength composite light after passing through the first combined mirror group, and the dual-wavelength composite light can form a tri-wavelength composite light after passing through the second combined mirror group. The laser splitter mirror group includes three beam splitters, each of which can receive multi-wavelength composite light and separate and output the corresponding single-wavelength laser light. Each beam splitter is reciprocating and its movement path passes through the optical path from which the laser light is emitted.

2. The multi-wavelength laser as described in claim 1, characterized in that, The laser source emits infrared laser light with a wavelength of 1064nm.

3. The multi-wavelength laser as described in claim 2, characterized in that, The laser source emits laser M 2 ≤1.

3.

4. The multi-wavelength laser as described in claim 2, characterized in that, The first combined mirror group includes a first half-wave plate and a second harmonic crystal through which a horizontally polarized 1064nm infrared laser can pass to generate a vertically polarized 532nm green laser. The first half-wave plate is a 1064nm single-wave plate and is rotatably arranged around a first axis. The extension direction of the first axis is perpendicular to the optical path direction of the laser emitted by the laser source.

5. The multi-wavelength laser as described in claim 4, characterized in that, The second combined mirror group includes a second half-wave plate and a third-harmonic crystal that allows horizontally polarized 1064nm infrared laser and vertically polarized 532nm green laser to pass through simultaneously to generate vertically polarized 355nm ultraviolet laser. The second half-wave plate is a 1064nm & 532nm dual-wave plate, and the second half-wave plate is rotatably arranged around a second axis. The extension direction of the second axis is perpendicular to the optical path direction of the laser emitted from the laser source.

6. The multi-wavelength laser as described in claim 5, characterized in that, It also includes a first driving unit and a second driving unit. The first driving unit is driven to connect with the first half-wave plate, and the first half-wave plate is driven to rotate around a first axis by the first driving unit. The second driving unit is driven to connect with the second half-wave plate, and the second half-wave plate is driven to rotate around a second axis by the second driving unit.

7. The multi-wavelength laser as described in claim 5, characterized in that, The three beam splitters include: A first beam splitter through which infrared lasers can pass; A second beam splitter that can reflect infrared laser light and allow green laser light to pass through; and, A third beam splitter that can reflect infrared and green lasers and allow ultraviolet lasers to pass through, wherein the first, second and third beam splitters are all reciprocating and the direction of movement is perpendicular to the light path direction of the laser emitted from the laser source.

8. The multi-wavelength laser as described in claim 7, characterized in that, The thickness of the first beam splitter is 5 mm, the thickness of the second beam splitter is 5.05 mm, and the thickness of the third beam splitter is 5.10 mm.

9. The multi-wavelength laser as described in claim 7, characterized in that, It also includes an electric displacement platform, on which the first beam splitter, the second beam splitter, and the third beam splitter are all mounted. The first beam splitter, the second beam splitter, and the third beam splitter are driven to reciprocate by the electric displacement platform, and the direction of movement is perpendicular to the light path direction of the laser emitted from the laser source.

10. The multi-wavelength laser as described in claim 1, characterized in that, It also includes an absorber that can absorb stray light, the absorber being located in the optical path of the laser separation mirror assembly for filtering stray light.

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