Optical assembly, laser and laser processing apparatus
By optimizing the configuration of the resonant cavity, optical diffraction elements, frequency doubling crystal, and Q-switch in the optical components, the problem of poor beam stability in solid-state lasers was solved, and the stability and power of the beam were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANS LASER TECH IND GRP CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-07-07
AI Technical Summary
When the Q-switches of a solid-state laser are turned on and off, the local temperature difference in the frequency doubling crystal becomes large, resulting in poor beam stability.
In the optical assembly, the resonant cavity, optical diffraction element, frequency doubling crystal, and Q switch are arranged sequentially along the light output direction. The optical diffraction element homogenizes the beam, the frequency doubling crystal modulates the frequency, and the Q switch controls the beam direction. The frequency doubling crystal is placed before the Q switch to reduce temperature changes, and the optical diffraction element is placed before the frequency doubling crystal to reduce damage to the Q switch from the beam.
It improves the stability and power of the beam emitted from the Q-switch, reduces damage to the Q-switch from the beam, and enhances the overall stability of the beam.
Smart Images
Figure CN224472916U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical device technology, and in particular to an optical component, a laser, and laser processing equipment. Background Technology
[0002] Solid-state lasers typically consist of a Q-switch and a frequency-doubling crystal, arranged sequentially along the optical path. When the Q-switch of a solid-state laser is turned on or off, it causes a large local temperature difference in the frequency-doubling crystal, resulting in poor stability of the beam emitted from the Q-switch. Utility Model Content
[0003] This application provides an optical component, a laser, and a laser processing device that can improve the stability of the laser beam.
[0004] In a first aspect, embodiments of this application provide an optical component, the optical component comprising the following components arranged sequentially along the light emission direction:
[0005] A resonant cavity, used to emit a light beam;
[0006] An optical diffraction element, the optical diffraction element being used to homogenize the light beam;
[0007] A frequency doubling crystal, used to modulate the frequency of the light beam;
[0008] A Q-switch is used to adjust the direction of the light beam to control whether light is emitted.
[0009] In some possible implementations of the first aspect, the optical component further includes:
[0010] The housing has a light-emitting aperture. The resonant cavity, the optical diffraction element, the frequency doubling crystal, and the Q switch are all disposed inside the housing. The light-emitting aperture is located on the light-emitting optical path.
[0011] In some possible implementations of the first aspect, the optical component further includes:
[0012] A galvanometer is disposed on the side of the Q switch away from the frequency doubling crystal in the light-emitting direction.
[0013] In some possible implementations of the first aspect, the optical component further includes:
[0014] A field lens is disposed on the side of the galvanometer away from the Q switch in the light-emitting direction.
[0015] In some possible implementations of the first aspect, the optical component further includes:
[0016] A beam expander is disposed between the Q switch and the galvanometer.
[0017] In some possible implementations of the first aspect, the optical component further includes:
[0018] The MEMS mirror is disposed between the optical diffraction element and the frequency doubling crystal.
[0019] In some possible implementations of the first aspect, the Q switch is an acousto-optic Q switch or an electro-optic Q switch.
[0020] Secondly, embodiments of this application provide a laser, which includes optical components as described in any of the above technical solutions.
[0021] Thirdly, embodiments of this application provide a laser processing device, which includes the laser described in the above technical solution.
[0022] The optical components, laser, and laser processing equipment provided in this application embodiment include a resonant cavity, an optical diffraction element, a frequency doubling crystal, and a Q-switch arranged sequentially along the light emission direction to modulate the light beam and obtain the desired beam. The resonant cavity is used to emit the light beam, the optical diffraction element is used to homogenize the light beam, the frequency doubling crystal is used to modulate the frequency of the light beam, and the Q-switch is used to adjust the direction of the light beam to control whether light is emitted. Placing the frequency doubling crystal before the Q-switch can reduce the local temperature change of the frequency doubling crystal at the moment the Q-switch is turned on and off, thereby improving the stability of the light beam emitted from the Q-switch. Placing the optical diffraction element before the frequency doubling crystal can reduce the damage of the light beam to the Q-switch, increase the power of the light beam emitted from the Q-switch, and improve the stability of the light beam emission. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the optical component of this application.
[0025] Explanation of icon numbers:
[0026] 1. Resonant cavity; 2. Optical diffraction element; 3. Frequency doubling crystal; 4. Q switch; 5. Housing; 6. Galvanometer; 7. Field lens; 8. Beam expander.
[0027] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0031] It should be understood that the term "and / or" as used in this application specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0033] This application provides an optical component, a laser, and a laser processing device to solve the technical problem of poor laser beam stability.
[0034] In the embodiments of this application, such as Figure 1As shown, the optical assembly includes a resonant cavity 1, an optical diffraction element 2, a frequency doubling crystal 3, and a Q switch 4 arranged sequentially along the light emission direction. The resonant cavity 1 is used to emit a light beam, the optical diffraction element 2 is used to homogenize the light beam, the frequency doubling crystal 3 is used to modulate the frequency of the light beam, and the Q switch 4 is used to adjust the direction of the light beam to control whether light is emitted.
[0035] In this embodiment, the frequency doubling crystal 3 can double the frequency of the light beam to increase its frequency. The frequency doubling crystal 3 can be a nonlinear crystal such as LBO, BIBO, or BBO.
[0036] In this embodiment, the resonant cavity 1, optical diffraction element 2, frequency doubling crystal 3, and Q switch 4 are arranged sequentially along the light emission direction to modulate the light beam and obtain the desired beam. The resonant cavity 1 is used to emit the light beam, the optical diffraction element 2 is used to homogenize the light beam, the frequency doubling crystal 3 is used to modulate the frequency of the light beam, and the Q switch 4 is used to adjust the direction of the light beam to control whether light is emitted. Placing the frequency doubling crystal 3 before the Q switch 4 can reduce the local temperature change of the frequency doubling crystal 3 at the moment the Q switch 4 is turned on and off, thereby improving the stability of the light beam emitted from the Q switch 4. Placing the optical diffraction element 2 before the frequency doubling crystal 3 can reduce the damage of the light beam to the Q switch 4, increase the power of the light beam emitted from the Q switch 4, and improve the stability of the light beam emission. Therefore, the sequential arrangement of the resonant cavity 1, optical diffraction element 2, frequency doubling crystal 3, and Q switch 4 along the light emission direction can improve the stability of the light beam emitted from the Q switch 4.
[0037] In one embodiment, such as Figure 1 As shown, the optical assembly also includes a housing 5, on which a light-emitting hole is provided. The resonant cavity 1, the optical diffraction element 2, the frequency doubling crystal 3, and the Q switch 4 are all disposed inside the housing 5, and the light-emitting hole is located on the light-emitting optical path.
[0038] The light exit aperture is located on the light exit path so that the light beam emitted from Q switch 4 can exit through the light exit aperture, facilitating workpiece processing. The resonant cavity 1, optical diffraction element 2, frequency doubling crystal 3, and Q switch 4 are all housed within the housing 5, which provides protection. This also reduces the impact of air disturbance, temperature, and humidity on the light beam, thereby improving beam stability.
[0039] In one embodiment, such as Figure 1 As shown, the optical assembly also includes an external optical path. The external optical path includes a galvanometer 6, which is positioned on the side of the Q switch 4 away from the frequency doubling crystal 3 in the light-emitting direction. The galvanometer 6 is used to change the direction of the light beam to control the scanning trajectory of the light beam.
[0040] In one embodiment, such as Figure 1As shown, the external optical path also includes a field lens 7, which is located on the side of the galvanometer 6 away from the Q switch 4 in the light output direction. The field lens 7 is used to focus the beam to perform optical correction on the beam and form a uniform focal plane.
[0041] In one embodiment, such as Figure 1 As shown, the external optical path also includes a beam expander 8, which is located between the Q switch 4 and the galvanometer 6. The beam expander 8 is used to increase the diameter of the beam.
[0042] In one embodiment, such as Figure 1 As shown, the galvanometer 6, field mirror 7, and beam expander 8 are all located outside the housing 5.
[0043] In one embodiment, the optical component further includes a MEMS mirror, which is disposed between the optical diffraction element 2 and the frequency doubling crystal 3. The MEMS mirror is used to detect and compensate for aberrations in real time. The MEMS mirror is also known as a microelectromechanical system mirror.
[0044] In one embodiment, the Q switch 4 is an acousto-optic Q switch or an electro-optic Q switch.
[0045] Furthermore, this application also provides a laser, which includes an optical component. The specific structure of the optical component is as described in the above embodiments. Since the laser adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments.
[0046] Furthermore, this application also provides a laser processing device, which includes a laser. The specific structure of the laser is as described in the above embodiments. Since the laser processing device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments.
[0047] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. An optical component, characterized in that, The optical components include those arranged sequentially along the light emission direction: A resonant cavity, used to emit a light beam; An optical diffraction element, the optical diffraction element being used to homogenize the light beam; A frequency doubling crystal, used to modulate the frequency of the light beam; A Q-switch is used to adjust the direction of the light beam to control whether light is emitted.
2. The optical component as described in claim 1, characterized in that, The optical components also include: The housing has a light-emitting aperture. The resonant cavity, the optical diffraction element, the frequency doubling crystal, and the Q switch are all disposed inside the housing. The light-emitting aperture is located on the light-emitting optical path.
3. The optical component as described in claim 1, characterized in that, The optical components also include: A galvanometer is disposed on the side of the Q switch away from the frequency doubling crystal in the light-emitting direction.
4. The optical component as described in claim 3, characterized in that, The optical components also include: A field lens is disposed on the side of the galvanometer away from the Q switch in the light-emitting direction.
5. The optical component as described in claim 4, characterized in that, The optical components also include: A beam expander is disposed between the Q switch and the galvanometer.
6. The optical component as claimed in claim 1, characterized in that, The optical components also include: The MEMS mirror is disposed between the optical diffraction element and the frequency doubling crystal.
7. The optical component as claimed in claim 1, characterized in that, The Q switch is an acousto-optic Q switch or an electro-optic Q switch.
8. A laser, characterized in that, The laser includes the optical components as described in any one of claims 1 to 7.
9. A laser processing device, characterized in that, The laser processing equipment includes the laser as described in claim 8.