Continuous green laser

Abstract

The utility model provides a continuous green laser which comprises a hollow shell, and an optical element assembly, a first photoelectric detection assembly, a second photoelectric detection assembly and a main control circuit board are arranged in the shell. The optical element assembly comprises a polarization beam splitting module, a first frequency doubling assembly and a second frequency doubling assembly; the polarization beam splitting module is used for splitting the received target continuous infrared laser into a first path of polarization infrared laser and a second path of polarization infrared laser; the first frequency doubling assembly is used for converting part of the first path of polarized infrared laser into first continuous green laser; the second frequency doubling assembly is used for converting part of the second path of polarized infrared laser into second continuous green laser; the main control circuit board obtains the laser detection power of the first continuous green laser and the laser detection power of the second continuous green laser through the first photoelectric detection assembly and the second photoelectric detection assembly respectively, and adjusts the optical element assembly according to the laser detection power of the first continuous green laser and the laser detection power of the second continuous green laser so as to improve the stability of green laser output.

Description

Technical Field

[0001] This utility model relates to the field of laser technology, and more specifically, to a continuous green laser. Background Technology

[0002] Continuous green lasers have attracted much attention due to their wide application in metal welding and metal printing (such as 3D). Currently, to reduce costs, non-polarization-maintaining infrared light sources are typically used, and frequency doubling of the green laser is achieved through beam splitting using a first polarizing beam splitter (PBS). However, while this method reduces costs, the polarization state of the non-polarization-maintaining light source and the frequency-doubled output power are easily affected by ambient temperature, mechanical vibration, and other external interference factors, resulting in poor stability of the output green laser. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a continuous green laser that can improve the stability of the output green laser.

[0004] This utility model provides a continuous green laser, comprising a hollow housing, an optical fiber template disposed inside the housing, and a light source module for generating continuous infrared laser light from a target disposed on the optical fiber template; the housing also comprises an optical element assembly, a first photoelectric detection assembly, a second photoelectric detection assembly, and a main control circuit board; wherein, the optical element assembly includes a polarization beam splitting module, a first frequency doubling assembly, and a second frequency doubling assembly;

[0005] The polarization beam splitter module is used to receive the target continuous infrared laser and split the target continuous infrared laser into a first polarized infrared laser and a second polarized infrared laser that are transmitted along a first optical path direction and a second optical path direction, respectively; the first optical path direction is the same as the optical path direction of the target continuous infrared laser, and the second optical path direction is perpendicular to the optical path direction of the target continuous infrared laser.

[0006] The first frequency doubling component is used to convert a portion of the first polarized infrared laser into a first continuous green laser; the second frequency doubling component is used to convert a portion of the second polarized infrared laser into a second continuous green laser.

[0007] The first photoelectric detection component is used to detect the laser detection power of the first continuous green laser; the second photoelectric detection component is used to detect the laser detection power of the second continuous green laser.

[0008] The main control circuit board is equipped with a main controller, which is connected to the first photoelectric detection component and the second photoelectric detection component respectively. The main controller is used to obtain the laser detection power of the first continuous green laser through the first photoelectric detection component and the laser detection power of the second continuous green laser through the second photoelectric detection component. The main controller adjusts the optical element assembly according to the laser detection power so that the power of the first continuous green laser is within a first preset range and the power of the second continuous green laser is within a second preset range.

[0009] In one possible implementation, the optical element assembly further includes a beam combining module, which is used to combine the first continuous green laser and the second continuous green laser to obtain a target continuous green laser and output it.

[0010] In one possible implementation, the polarization beam splitter module includes:

[0011] An electric waveplate is disposed on the transmission optical path of the target continuous infrared laser and connected to the main controller. The electric waveplate is used to adjust the ratio of S-beam and P-beam in the target continuous infrared laser in response to the adjustment command issued by the main controller.

[0012] A first polarization beam splitter is disposed on the side of the electrodynamic waveplate away from the light source module, and is used to split the target continuous infrared laser beam adjusted by the electrodynamic waveplate into a first polarized infrared laser beam and a second polarized infrared laser beam; wherein, the first polarized infrared laser beam is a P-beam and the second polarized infrared laser beam is an S-beam.

[0013] In one possible implementation, the laser further includes a photoelectric probe circuit board connected to the main controller;

[0014] The first photoelectric detection component includes a first photoelectric detection probe connected to the photoelectric probe circuit board. The first photoelectric detection probe is disposed in the transmission optical path of the first continuous green laser to detect the laser detection power of the first continuous green laser; and / or,

[0015] The second photoelectric detection component includes a second photoelectric detection probe connected to the photoelectric probe circuit board. The second photoelectric detection probe is disposed in the transmission optical path of the second continuous green laser to detect the laser detection power of the second continuous green laser.

[0016] The photoelectric probe circuit board is used to send the laser detection power of the first continuous green laser and the laser detection power of the second continuous green laser to the main controller.

[0017] In one possible implementation, the first photoelectric detection component further includes a third photoelectric detection probe connected to the photoelectric probe circuit board. The third photoelectric detection probe is disposed on the transmission optical path of the first polarized infrared laser to detect the laser detection power of the first polarized infrared laser; and / or,

[0018] The second photoelectric detection component also includes a fourth photoelectric detection probe connected to the photoelectric probe circuit board. The fourth photoelectric detection probe is disposed on the transmission optical path of the second polarized infrared laser to detect the laser detection power of the second polarized infrared laser.

[0019] The photoelectric probe circuit board also sends the laser detection power of the first polarized infrared laser and the laser detection power of the second polarized infrared laser to the main controller.

[0020] In one possible implementation, the laser further includes a pump source driving circuit board connected to the light source module and the main controller to receive adjustment commands from the main controller and drive the light source module to output a target continuous infrared laser with corresponding power.

[0021] In one possible implementation, the first frequency doubling component includes a first frequency doubling element and a first dichroic mirror, wherein the first dichroic mirror is disposed on the light-emitting side of the first frequency doubling element;

[0022] The first frequency doubling element is used to convert a portion of the first polarized infrared laser into the first continuous green laser, and the first continuous green laser and the first residual polarized infrared laser form a first mixed light; the first dichroic mirror is used to receive the first mixed light, reflect the first continuous green laser in the first mixture and output it, and transmit the first residual polarized infrared laser and output it; and / or,

[0023] The second frequency doubling component includes a second frequency doubling element and a second dichroic mirror. The second dichroic mirror is disposed on the light-emitting side of the second frequency doubling element. The second frequency doubling element is used to convert a portion of the second polarized infrared laser into the second continuous green laser. The second continuous green laser and the second residual polarized infrared laser form a second mixed light. The second dichroic mirror is used to receive the second mixed light, reflect the second continuous green laser in the second mixture and output it, and transmit the second residual polarized infrared laser and output it.

[0024] In one possible implementation, the optical element assembly further includes a first light-collecting element and a second light-collecting element; the first light-collecting element is disposed on the side of the first dichroic mirror away from the first frequency-doubling element, for collecting the first path of residual polarized infrared laser light; and / or,

[0025] The second light-collecting element is disposed on the side of the second dichroic mirror away from the second frequency doubling element, and is used to collect the second residual polarized infrared laser.

[0026] In one possible implementation, the light source module includes:

[0027] A light source used to generate pump light;

[0028] A resonant cavity assembly is used to receive pump light generated by the light source and convert the pump light into non-polarization-maintaining infrared laser.

[0029] A laser output head is used to collimate the non-polarization-maintaining infrared laser output from the resonant cavity assembly to obtain the target continuous infrared laser.

[0030] In one possible implementation, the resonant cavity assembly includes:

[0031] The first grating, serving as the first end of the resonant cavity, is used to receive the pump light generated by the light source;

[0032] A gain fiber is disposed on the side of the first grating away from the light source, and is used to convert the pump light into non-polarization-maintaining infrared laser.

[0033] The second grating is disposed on the side of the gain fiber away from the first grating, serving as the second end of the resonant cavity, and is used to output the non-polarization-maintaining infrared laser.

[0034] The continuous green laser provided in this embodiment includes, in addition to optical components, a first photoelectric detection component, a second photoelectric detection component, and a main control circuit board. The first and second photoelectric detection components enable power detection of the first continuous green laser (converted by the first frequency doubling component) and the second continuous green laser (converted by the second frequency doubling component). The main control circuit board can adjust the optical components based on the detection results to ensure that the power of the first continuous green laser is within a first preset range and the power of the second continuous green laser is within a second preset range. This reduces costs while enhancing the adjustability of the green laser system and improving the stability of the continuous green laser output, enabling it to adapt to different application scenarios.

[0035] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This diagram shows a three-dimensional structural schematic of a continuous green laser provided in an embodiment of the present invention;

[0038] Figure 2 This diagram illustrates the principle block diagram of a continuous green laser provided in an embodiment of the present invention.

[0039] Figure 3 A schematic block diagram of an optical element assembly provided in an embodiment of the present invention is shown;

[0040] Figure 4 A schematic block diagram of another optical element assembly provided in an embodiment of the present invention is shown;

[0041] Figure 5 A schematic diagram of the optical path structure of a continuous green laser provided in an embodiment of the present invention is shown. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0043] In this embodiment of the invention, 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] Furthermore, the term "and / or" in this document merely describes a relationship, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0048] Currently, there are two main approaches to implementing continuous-wave green lasers. One approach uses a high-power polarization-maintaining fiber laser as the frequency-doubling source, but the cost of polarization-maintaining fiber devices is relatively high. To reduce costs, a non-polarization-maintaining infrared source can be used, and frequency doubling of the green laser can be achieved through beam splitting using a polarizing beam splitter (PBS). However, research has revealed the following problems with continuous-wave green lasers using non-polarization-maintaining infrared sources:

[0049] 1) Power instability: The polarization state and frequency doubling output power of the laser are easily affected by the external environment (such as temperature changes, mechanical vibration, etc.), making it difficult to meet the stability requirements of high-precision applications.

[0050] 2) Poor adjustability: The light output from a non-polarization-maintaining fiber laser is split by a PBS. Due to the randomness of the polarization state, the output light not only fluctuates, but the proportion of orthogonal polarization states cannot be adjusted, which limits the stable output of the laser.

[0051] Based on the above research, this utility model provides a continuous green laser. In addition to optical components, the continuous green laser includes a main control circuit board, a first photoelectric detection component, and a second photoelectric detection component. A main controller is mounted on the main control circuit board and connected to the first and second photoelectric detection components. The main controller obtains the laser detection power of the converted continuous green laser through the first and second photoelectric detection components and adjusts the optical components according to the laser detection power to ensure that the power of the converted continuous green laser is within a preset range. Thus, by adding the main control circuit board and photoelectric detection components, feedback control and adjustment of the optical components can be achieved, thereby improving the stability of the output continuous green laser.

[0052] For example, the continuous green laser can be mounted on an optical platform for laser processing, such as metal welding, metal printing, etc., using the generated continuous green laser light.

[0053] The continuous green laser provided in the embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0054] Please refer to the following: Figure 1 and Figure 2 The continuous green laser 100 provided in this embodiment includes a hollow housing 101 and a first cover plate 102 and a second cover plate 103 for sealing both ends of the housing 101. An optical fiber template 104 is disposed inside the housing 101, and a light source module 105 for generating continuous infrared laser light from a target is disposed on the optical fiber template 104. An optical element assembly 210, a first photoelectric detection assembly 220, a second photoelectric detection assembly 230, and a main control circuit board 33 are also disposed inside the housing 101.

[0055] Specifically, see Figure 3 As shown, the optical element assembly 210 includes a polarization beam splitter module 211, a first frequency doubling component 212, and a second frequency doubling component 213.

[0056] The polarization beam splitter module 211 is used to receive the target continuous infrared laser and split the target continuous infrared laser into beams respectively along the first optical path direction (see...). Figure 5 (Central A direction) and second optical path direction (see Figure 5The first and second polarized infrared lasers are transmitted in the B direction; the first optical path direction is the same as the optical path direction of the target continuous infrared laser, and the second optical path direction is perpendicular to the optical path direction of the target continuous infrared laser.

[0057] The first frequency doubling component 212 is used to convert a portion of the first polarized infrared laser into a first continuous green laser; the second frequency doubling component 213 is used to convert a portion of the second polarized infrared laser into a second continuous green laser.

[0058] The main control circuit board 33 is equipped with a main controller (not shown in the figure). The main controller is connected to the first photoelectric detection component 220 and the second photoelectric detection component 230 respectively. The main controller is used to obtain the laser detection power of the first continuous green laser through the first photoelectric detection component 220 and the laser detection power of the second continuous green laser through the second photoelectric detection component 230, and adjust the optical element assembly 210 according to the laser detection power of the first continuous green laser and the second continuous green laser, so that the power of the first continuous green laser is within a first preset range and the power of the second continuous green laser is within a second preset range.

[0059] Here, the first and second preset ranges are not specifically limited. The power of the output continuous green laser can be stabilized within a specific range according to actual needs, thereby improving the stability of the continuous green laser output.

[0060] In this embodiment of the present invention, the continuous green laser 100 includes not only the optical element assembly 210, but also a first photoelectric detection assembly 220, a second photoelectric detection assembly 230, and a main control circuit board 33. The first photoelectric detection assembly 220 and the second photoelectric detection assembly 230 can detect the power of the first continuous green laser converted by the first frequency doubling assembly 211 and the second continuous green laser converted by the second frequency doubling assembly. The main control circuit board can adjust the optical element assembly 210 according to the detection results so that the power of the first continuous green laser is within a first preset range and the power of the second continuous green laser is within a second preset range. This can reduce costs while enhancing the adjustment capability of the green laser system and improving the stability of the continuous green laser output, enabling it to adapt to different scenario requirements.

[0061] See Figure 4 As shown, in some embodiments, the optical element assembly 210 further includes a beam combining module 214, which is used to combine the first continuous green laser and the second continuous green laser to obtain the target continuous green laser and output it.

[0062] Understandably, in practical applications, the beam combining module 214 can be set up or omitted as needed. For example, when two continuous green lasers need to be output, the beam combining module 214 can be omitted, and the first and second continuous green lasers can be output directly. If only one continuous green laser needs to be output, the beam combining module 214 can be set up to combine the first and second continuous green lasers before output. For example, the beam combining module 214 can be implemented using a polarization beam splitter.

[0063] The following is combined Figure 5 The optical element assembly 210, the first photoelectric detection assembly 220, and the second photoelectric detection assembly 230 are described in detail.

[0064] See Figure 5 As shown, Figure 5 This is a schematic diagram of the optical path structure of the continuous green laser. Specifically, the light source module 105 includes a light source 3, a resonant cavity assembly 1051, and a laser output head 6. The light source 3 generates pump light; the resonant cavity assembly 1051 receives the pump light generated by the light source 3 and converts it into non-polarization-maintaining infrared laser; the laser output head 6 collimates the non-polarization-maintaining infrared laser output from the resonant cavity assembly 1051 to obtain the target continuous infrared laser and outputs it.

[0065] Specifically, the laser output head 6 can be a quick-bayont housing (QBH) fiber laser output head. This ensures stable optical transmission between the gain fiber 5 and the first polarization beam splitter 8 by providing a collimating and focusing laser output head 6.

[0066] For example, the resonant cavity assembly 1051 includes a first grating 1, a gain fiber 5, and a second grating 2. The first grating 1 serves as the first end of the resonant cavity and is used to receive the pump light generated by the light source 3; the gain fiber 5 is disposed on the side of the first grating 1 away from the light source 3 and is used to convert the pump light into non-polarization-maintaining infrared laser; the second grating 2 is disposed on the side of the gain fiber 5 away from the first grating 1 and serves as the second end of the resonant cavity, used to output the non-polarization-maintaining infrared laser.

[0067] The gain fiber 5 can amplify the pump light through stimulated emission, converting it into high-power non-polarization-maintaining infrared light. For example, the first grating 1 can be a high-reflectivity fiber grating, and the second grating 2 can be a low-reflectivity fiber grating; that is, the reflectivity of the first grating 1 is greater than that of the second grating 2. Furthermore, the light source 3, as the pump source, can be implemented using a pump laser diode.

[0068] In some possible embodiments, when there are multiple light sources 3, the infrared laser module 105 further includes an optical fiber combiner 4. The optical fiber combiner 4 is disposed between the light sources 3 and the resonant cavity assembly 1051, and is used to combine the pump light beams generated by the multiple light sources 3 and guide them into the resonant cavity. The light sources 3, the optical fiber combiner 4, and the resonant cavity assembly 1051 are connected by optical fibers for optical path transmission.

[0069] In some embodiments, the polarization beam splitting module 211 includes an electric waveplate 7 and a first polarization beam splitter 8. Specifically, the electric waveplate 7 is disposed on the transmission optical path of the target continuous infrared laser and connected to the main controller. The electric waveplate 7 is used to adjust the proportion of S-beams and P-beams in the target continuous infrared laser in response to adjustment commands issued by the controller.

[0070] It is understood that the electric waveplate 7 can be a half-waveplate. Since the deviation angle between the P-beam and the S-beam is 90 degrees, the proportion of S-beam and P-beam in the target continuous infrared laser can be adjusted by adjusting the rotation angle of the electric waveplate 7.

[0071] The first polarization beam splitter 8 is disposed on the side of the electric waveplate 7 away from the light source module 105, and is used to split the target continuous infrared laser beam adjusted by the electric waveplate 7 into the first polarized infrared laser beam and the second polarized infrared laser beam.

[0072] Here, the first polarized infrared laser is parallel polarized light, and the second polarized infrared laser is perpendicular polarized light. Parallel polarized light (p-light) refers to light whose polarization direction is parallel to the transmission optical path plane, and perpendicular polarized light (s-light) refers to light whose polarization direction is perpendicular to the optical path plane. The optical path plane is a plane used to describe light propagation.

[0073] In this embodiment of the invention, an electric waveplate 7 is added before the first polarization beam splitter 8, thereby enabling flexible adjustment of the beam splitting ratio of orthogonally polarized light, thus optimizing the polarization state entering the frequency doubling component. Simultaneously, combined with the control of the main controller, the beam splitting ratio can be dynamically adjusted according to real-time application requirements, which helps improve the stability of the frequency doubling output.

[0074] Understandably, in order to better detect the laser power, the continuous green laser 100 also includes a photoelectric probe circuit board 31, which is connected to the main controller on the main control circuit board 33.

[0075] The first photoelectric detection component 220 includes a first photoelectric detection probe 28 connected to the photoelectric probe circuit board 31. The first photoelectric detection probe 28 is disposed in the transmission optical path of the first continuous green laser to detect the laser detection power of the first continuous green laser. The second photoelectric detection component 230 includes a second photoelectric detection probe 26 connected to the photoelectric probe circuit board 31. The second photoelectric detection probe 26 is disposed in the transmission optical path of the second continuous green laser to detect the laser detection power of the second continuous green laser. The photoelectric probe circuit board 31 also sends the acquired laser detection power of the first continuous green laser and the laser detection power of the second continuous green laser to the main controller on the main control circuit board 33.

[0076] Optionally, to further improve adjustment accuracy, the first photoelectric detection component 220 further includes a third photoelectric detection probe 20 connected to the photoelectric probe circuit board 31. The third photoelectric detection probe 20 is disposed on the transmission optical path of the first polarized infrared laser to detect the laser detection power of the first polarized infrared laser. The second photoelectric detection component 230 further includes a fourth photoelectric detection probe 21 connected to the photoelectric probe circuit board 31. The fourth photoelectric detection probe 21 is disposed on the transmission optical path of the second polarized infrared laser to detect the laser detection power of the second polarized infrared laser. The photoelectric probe circuit board 31 also sends the acquired laser detection power of the first polarized infrared laser and the laser detection power of the second polarized infrared laser to the main controller on the main control circuit board 33.

[0077] In this way, the main controller can also combine the laser detection power of the first polarized infrared laser, the second polarized infrared laser, the first continuous green laser, and the second continuous green laser to adjust the electric waveplate 7, thereby further improving the adjustment accuracy. For example, the main controller can determine whether the factors affecting the laser detection power of the first continuous green laser are affected by the first frequency doubling element 11 based on the laser detection power of the first polarized infrared laser, the laser detection power of the first continuous green laser, and the conversion efficiency of the first frequency doubling element 11. This can eliminate the influence of other factors and further improve the adjustment accuracy.

[0078] It should be noted that the type of photoelectric detection probe is not limited and can include photoelectric sensors and photon detectors (such as photodiodes, photomultiplier tubes, etc.).

[0079] In some embodiments, to further improve the stability of the green laser output power, the main control circuit board 33 can adjust not only the electric waveplate 7 but also the light source 3. Therefore, in this embodiment, to achieve the driving adjustment of the light source 3, the continuous green laser 100 also includes a pump source driving circuit board 32. The pump source driving circuit board 32 is connected to the light source 3 in the light source module 105 and to the main controller on the main control circuit board 33 to receive adjustment commands from the main controller and drive the light source 3 to output a target continuous infrared laser with corresponding power. For example, the main controller can control the pump source driving circuit board 32 to increase or decrease the power of the pump light output by the light source 3 based on the detection results.

[0080] In some alternative embodiments, the continuous green laser 100 further includes a first light-collecting element 25 and a second light-collecting element 24.

[0081] The first frequency doubling component 212 includes a first frequency doubling element 11 and a first dichroic mirror 22. The first dichroic mirror 22 is positioned on the light-emitting side of the first frequency doubling element 11 and is used to reflect green laser light and transmit infrared laser light. The first frequency doubling element 11 is used to convert a portion of the first polarized infrared laser light into the first continuous green laser light. The first continuous green laser light and the first residual polarized infrared laser light form a first mixed light. The first dichroic mirror 22 is used to receive the first mixed light light, reflect the first continuous green laser light in the first mixture and output it, and transmit the first residual polarized infrared laser light and output it.

[0082] The first light-collecting element 24 is disposed on the side of the first dichroic mirror 22 away from the first frequency doubling element 11, and is used to collect the first residual polarized infrared laser. That is, the first continuous green laser obtained by converting the first polarized infrared laser into the first frequency doubling element 11 is reflected by the first dichroic mirror 22 and output, and the remaining first residual infrared laser is transmitted through the first dichroic mirror 22 and enters the first light-collecting element 25.

[0083] Similarly, the second frequency doubling component 213 includes a second frequency doubling element 15 and a second dichroic mirror 19, with the second dichroic mirror 19 disposed on the light-emitting side of the second frequency doubling element 15. The second frequency doubling element 15 is used to convert a portion of the second polarized infrared laser into the second continuous green laser, and the second continuous green laser and the second residual polarized infrared laser form a second mixed light; the second dichroic mirror 19 is used to receive the second mixed light, reflect the second continuous green laser in the second mixture and output it, and transmit the second residual polarized infrared laser and output it.

[0084] The second light-collecting element 24 is disposed on the side of the second dichroic mirror 19 away from the second frequency doubling element 15, and is used to collect the second residual polarized infrared laser. That is, the second continuous green laser obtained by converting the second polarized infrared laser by the second frequency doubling element 15 is reflected by the second dichroic mirror 19 and output, and the remaining second residual infrared laser is transmitted through the second dichroic mirror 19 and enters the second light-collecting element 24.

[0085] It should be noted that a dichroic mirror, also known as a semi-transparent and semi-reflective mirror, may include a light power absorber as its light-collecting component.

[0086] Specifically, the first frequency doubling element 11 and the second frequency doubling element 15 can be frequency doubling crystals. In practical applications, it is often difficult for the frequency doubling elements to completely convert the non-polarization-maintaining infrared laser into green laser light. Therefore, the output of the frequency doubling element is based on the conversion of a portion of the non-polarization-maintaining infrared laser light into green laser light. The remaining portion of the non-polarization-maintaining infrared laser light that is not converted into green laser light is also called residual infrared laser light. Here, the first frequency doubling element 11 and the second frequency doubling element 15 can be nonlinear optical crystals such as LBO, used to convert the infrared fundamental frequency light into green laser light (wavelength around 532 nm) through a second harmonic generation process.

[0087] It should be noted that the polarization direction that the first frequency doubling element 11 can process matches the polarization state of the first polarized infrared laser, and the polarization direction that the second frequency doubling element 15 can process matches the polarization state of the second polarized infrared laser.

[0088] Furthermore, during the conversion of green laser light, the frequency doubling element absorbs heat generated by the lost light. If excessive heat is absorbed, heat dissipation is necessary to ensure the processing effect of the frequency doubling element. Therefore, a temperature control element can be installed at the frequency doubling element to cool it down when its temperature exceeds a preset temperature threshold.

[0089] In order to enable the first polarized infrared laser to be directed into the first frequency doubling element 11, the first frequency doubling component 212 further includes a first reflector 18 and a second reflector 17. The first reflector 18 is disposed on the side of the first polarization beam splitter 8 away from the motorized waveplate 7. The first reflector 18 and the second reflector 17 are used to convert the first polarized infrared laser from the first optical path direction to a third optical path direction parallel to it. The first frequency doubling element 11 is disposed in the third optical path direction.

[0090] In some embodiments, the first frequency doubling component 212 further includes a first lens 10 and a second lens 12, which are respectively located on both sides of the first frequency doubling element 11. In this embodiment of the present invention, the second reflector 17, the first lens 10, the first frequency doubling element 11, the second lens 12, the first dichroic mirror 22, and the first light-collecting element 25 are arranged sequentially along the third optical path direction.

[0091] It is understood that in some embodiments, the second reflector 17 may be omitted depending on the actual setup requirements.

[0092] Similarly, to enable the second polarized infrared laser to be directed into the second frequency doubling element 15, the second frequency doubling assembly 213 further includes a third reflector 13. The third reflector 13 is disposed in the second optical path direction B and is used to convert the second polarized infrared laser from the second optical path direction to a fourth optical path direction perpendicular to it. The second frequency doubling element 15 is disposed in this fourth optical path direction. That is, this fourth optical path direction is parallel to the first optical path direction A.

[0093] In some embodiments, the second frequency doubling component 213 further includes a third lens 14 and a fourth lens 16, which are respectively located on both sides of the second frequency doubling element 15. In this embodiment of the present invention, the third reflector 13, the third lens 14, the second frequency doubling element 15, the fourth lens 16, the second dichroic mirror 19, and the second light-collecting element 24 are arranged sequentially along the fourth optical path direction.

[0094] It should be noted that the third photoelectric probe 20 is disposed along the first optical path direction on the side of the first reflector 18 away from the first polarizing beam splitter 8, and the fourth photoelectric probe 21 is disposed along the second optical path direction on the side of the third reflector 13 away from the first polarizing beam splitter 8.

[0095] Understandably, when the continuous green laser 100 includes a beam combiner module 214, the beam combiner module 214 may include a second polarization beam splitter 30. Further, the first frequency doubling component 212 also includes a fourth reflector 29, which is used to change the optical path direction of the first continuous green laser before it is fed into the second polarization beam splitter 30. The second frequency doubling component 213 also includes a fifth reflector 23 and a sixth reflector 27, which are used to change the optical path direction of the second continuous green laser before it is fed into the second polarization beam splitter 30. The direction in which the first continuous green laser is incident on the second polarization beam splitter 30 is perpendicular to the direction in which the second continuous green laser is incident on the second polarization beam splitter 30.

[0096] Understandably, the position of the second polarization beam splitter 30 can be set according to actual needs. Correspondingly, the placement of the fourth reflector 29, the fifth reflector 23, and the sixth reflector 27 can also be changed or some of the reflectors can be omitted according to actual needs, as long as the first continuous green laser and the second continuous green laser can be incident on the second polarization beam splitter 30 and the target continuous green laser can be output after beam combining.

[0097] It should be noted that, excluding the second polarizing beam splitter 30, the sixth reflecting mirror 27 can also be omitted, allowing the second continuous green laser to be reflected by the fifth reflecting mirror 23 and emitted along the optical path direction 35. Furthermore, the first photodetector 28 is disposed on the back side of the fourth reflecting mirror 29 to detect a small amount of the first continuous green laser emitted through the fourth reflecting mirror 29, and the second photodetector 26 is disposed on the back side of the fifth reflecting mirror 23 to detect a small amount of the second continuous green laser emitted through the fifth reflecting mirror 23. Here, the back side of a reflecting mirror refers to the side opposite to the reflecting surface of the reflecting mirror.

[0098] The following is combined Figure 5 The optical path principle of the continuous green laser provided in this embodiment will be explained.

[0099] like Figure 5 As shown, pump light generated by multiple light sources 3 is combined by fiber combiner 4 and enters the resonant cavity. It is then converted into non-polarization-maintaining infrared laser by gain fiber 5. This non-polarization-maintaining infrared laser is collimated by laser output head 6 to obtain the target continuous infrared laser. The target continuous infrared laser, after having its beam splitting ratio adjusted by electric waveplate 7, enters the first polarization beam splitter 8. After being split by the first polarization beam splitter 8, it yields a first non-polarization-maintaining infrared laser propagating along the first optical path direction A and a second non-polarization-maintaining infrared laser propagating along the second optical path direction B. The first non-polarization-maintaining infrared laser is reflected by the first reflector 18... After being reflected by the second reflector 17, the light passes through the first lens 10 and enters the first frequency doubling element 11. After being converted by the first frequency doubling element 11, the first continuous green laser is obtained. The first residual infrared laser (the first non-polarization-maintaining infrared laser that has not been converted) and the first continuous green laser form a first mixed light, which is output through the second lens 12 to the first dichroic mirror 22. After being separated by the first dichroic mirror 22, the first residual infrared laser is transmitted through the first dichroic mirror 22 and collected by the first collimator 25. The first continuous green laser is reflected by the first dichroic mirror 22 and then reflected by the fourth reflector 29 and enters the second polarization beam splitter 30.

[0100] Similarly, the second non-polarization-maintaining infrared laser is reflected by the third mirror 13 and then passes through the third lens 14 into the second frequency doubling element 15. After conversion by the second frequency doubling element 15, it becomes the second continuous green laser. The second residual infrared laser (the unconverted second non-polarization-maintaining infrared laser) and the second continuous green laser form a second mixed light. This second mixed light is output through the fourth lens 16 to the second dichroic mirror 19. After being separated by the second dichroic mirror 19, the second residual infrared laser is transmitted through the second dichroic mirror 19 and collected by the second collimator 24. The second continuous green laser is reflected by the second dichroic mirror 19, then by the fifth mirror 23 and the sixth mirror 27, and then enters the second polarization beam splitter 30. In this way, the first continuous green laser and the second continuous green laser are combined by the second polarization beam splitter 30 to obtain the target continuous green laser.

[0101] The continuous green laser 100 provided in this embodiment can detect the power of the first continuous green laser converted by the first frequency doubling component 211 and the second continuous green laser converted by the second frequency doubling component through the first photoelectric detection component 220 and the second photoelectric detection component 230. The main circuit board can adjust the optical component component 210 according to the detection results so that the power of the first continuous green laser is within a first preset range and the power of the second continuous green laser is within a second preset range. In this way, while reducing costs, the adjustment capability of the green laser system is enhanced, the stability of the continuous green laser output is improved, and it can adapt to different scenario requirements.

[0102] In other words, the continuous green laser 100 provided in this embodiment of the present invention, by using a non-polarization-maintaining infrared laser, not only reduces the manufacturing cost and complexity of the green laser, but also enhances its practicality by incorporating a feedback design. Specifically, by monitoring the output power of the green laser and the infrared laser in real time, the pump current and the angle of the electric waveplate 7 are dynamically adjusted, thereby ensuring high stability of the output power.

[0103] It is understood that the embodiments described above are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0104] Furthermore, the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. All should be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A continuous green laser, characterized in that, The device includes a hollow housing, within which an optical fiber template is disposed, and on which a light source module for generating continuous infrared laser light for a target is disposed; the housing also contains an optical element assembly, a first photoelectric detection assembly, a second photoelectric detection assembly, and a main control circuit board; wherein, the optical element assembly includes a polarization beam splitter module, a first frequency doubling assembly, and a second frequency doubling assembly; The polarization beam splitter module is used to receive the target continuous infrared laser and split the target continuous infrared laser into a first polarized infrared laser and a second polarized infrared laser that are transmitted along a first optical path direction and a second optical path direction, respectively; the first optical path direction is the same as the optical path direction of the target continuous infrared laser, and the second optical path direction is perpendicular to the optical path direction of the target continuous infrared laser. The first frequency doubling component is used to convert a portion of the first polarized infrared laser into a first continuous green laser; the second frequency doubling component is used to convert a portion of the second polarized infrared laser into a second continuous green laser. The first photoelectric detection component is used to detect the laser detection power of the first continuous green laser; the second photoelectric detection component is used to detect the laser detection power of the second continuous green laser. The main control circuit board is equipped with a main controller, which is connected to the first photoelectric detection component and the second photoelectric detection component respectively. The main controller is used to obtain the laser detection power of the first continuous green laser through the first photoelectric detection component and the laser detection power of the second continuous green laser through the second photoelectric detection component. The main controller adjusts the optical element assembly according to the laser detection power so that the power of the first continuous green laser is within a first preset range and the power of the second continuous green laser is within a second preset range.

2. The continuous green laser according to claim 1, characterized in that, The optical element assembly also includes a beam combining module, which is used to combine the first continuous green laser and the second continuous green laser to obtain the target continuous green laser and output it.

3. The continuous green laser according to claim 1, characterized in that, The polarization beam splitter module includes: An electric waveplate is disposed on the transmission optical path of the target continuous infrared laser and connected to the main controller. The electric waveplate is used to adjust the ratio of S-beam and P-beam in the target continuous infrared laser in response to the adjustment command issued by the main controller. A first polarization beam splitter is disposed on the side of the electrodynamic waveplate away from the light source module, and is used to split the target continuous infrared laser beam adjusted by the electrodynamic waveplate into a first polarized infrared laser beam and a second polarized infrared laser beam; wherein, the first polarized infrared laser beam is a P-beam and the second polarized infrared laser beam is an S-beam.

4. The continuous green laser according to claim 1, characterized in that, The laser also includes a photoelectric probe circuit board, which is connected to the main controller. The first photoelectric detection component includes a first photoelectric detection probe connected to the photoelectric probe circuit board. The first photoelectric detection probe is disposed in the transmission optical path of the first continuous green laser to detect the laser detection power of the first continuous green laser; and / or, The second photoelectric detection component includes a second photoelectric detection probe connected to the photoelectric probe circuit board. The second photoelectric detection probe is disposed in the transmission optical path of the second continuous green laser to detect the laser detection power of the second continuous green laser. The photoelectric probe circuit board is used to send the laser detection power of the first continuous green laser and the laser detection power of the second continuous green laser to the main controller.

5. The continuous green laser according to claim 4, characterized in that, The first photoelectric detection component further includes a third photoelectric detection probe connected to the photoelectric probe circuit board. The third photoelectric detection probe is disposed on the transmission optical path of the first polarized infrared laser to detect the laser detection power of the first polarized infrared laser; and / or, The second photoelectric detection component also includes a fourth photoelectric detection probe connected to the photoelectric probe circuit board. The fourth photoelectric detection probe is disposed on the transmission optical path of the second polarized infrared laser to detect the laser detection power of the second polarized infrared laser. The photoelectric probe circuit board also sends the laser detection power of the first polarized infrared laser and the laser detection power of the second polarized infrared laser to the main controller.

6. The continuous green laser according to claim 1, characterized in that, The laser also includes a pump source driving circuit board, which is connected to the light source module and the main controller. The pump source driving circuit board receives adjustment commands from the main controller and drives the light source module to output a target continuous infrared laser with corresponding power.

7. The continuous green laser according to claim 1, characterized in that, The first frequency doubling component includes a first frequency doubling element and a first dichroic mirror, wherein the first dichroic mirror is disposed on the light-emitting side of the first frequency doubling element; The first frequency doubling element is used to convert a portion of the first polarized infrared laser into the first continuous green laser, and the first continuous green laser and the first residual polarized infrared laser form a first mixed light; the first dichroic mirror is used to receive the first mixed light, reflect the first continuous green laser in the first mixture and output it, and transmit the first residual polarized infrared laser and output it; and / or, The second frequency doubling component includes a second frequency doubling element and a second dichroic mirror. The second dichroic mirror is disposed on the light-emitting side of the second frequency doubling element. The second frequency doubling element is used to convert a portion of the second polarized infrared laser into the second continuous green laser. The second continuous green laser and the second residual polarized infrared laser form a second mixed light. The second dichroic mirror is used to receive the second mixed light, reflect the second continuous green laser in the second mixture and output it, and transmit the second residual polarized infrared laser and output it.

8. The continuous green laser according to claim 7, characterized in that, The optical element assembly further includes a first light-collecting element and a second light-collecting element; the first light-collecting element is disposed on the side of the first dichroic mirror away from the first frequency-doubling element, and is used to collect the first path of residual polarized infrared laser light; and / or, The second light-collecting element is disposed on the side of the second dichroic mirror away from the second frequency doubling element, and is used to collect the second residual polarized infrared laser.

9. The continuous green laser according to claim 1, characterized in that, The light source module includes: A light source used to generate pump light; A resonant cavity assembly is used to receive pump light generated by the light source and convert the pump light into non-polarization-maintaining infrared laser. A laser output head is used to collimate the non-polarization-maintaining infrared laser output from the resonant cavity assembly to obtain the target continuous infrared laser.

10. The continuous green laser according to claim 9, characterized in that, The resonant cavity assembly includes: The first grating, serving as the first end of the resonant cavity, is used to receive the pump light generated by the light source; A gain fiber is disposed on the side of the first grating away from the light source, and is used to convert the pump light into non-polarization-maintaining infrared laser. The second grating is disposed on the side of the gain fiber away from the first grating, serving as the second end of the resonant cavity, and is used to output the non-polarization-maintaining infrared laser.

Images