Split-beam amplified quasi-continuous fiber laser
By introducing a lithium niobate nonlinear crystal and a phase modulator into a fiber laser, combined with a polarization controller, the problems of nonlinear effects and polarization instability in traditional fiber lasers are solved, frequency conversion and polarization stability are achieved, and the adaptability and reliability of the laser are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI RUILAIBO OPTOELECTRONICS TECH CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-07
AI Technical Summary
Traditional fiber lasers lack effective means to control and adjust nonlinear effects, making it difficult to achieve frequency conversion and tuning. Their polarization states are unstable, affecting their adaptability and reliability in specific applications.
A beam-splitting amplified quasi-continuous fiber laser is employed. By introducing a lithium niobate nonlinear crystal and a phase modulator into the optical path amplification channel, combined with a polarization controller and a polarization holder, the nonlinear effects can be controlled and the frequency can be converted, ensuring the stability and flexibility of the polarization state.
It achieves control over nonlinear effects, frequency tuning, and polarization state stability, improving the adaptability and reliability of the laser, and providing flexibility and high-efficiency output for complex application scenarios.
Smart Images
Figure CN224472911U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of laser technology, and in particular to a beam-splitting amplified quasi-continuous fiber laser. Background Technology
[0002] Compared to solid-state lasers and gas lasers, fiber lasers are widely used in industrial processing, military, medical, and sensing fields due to their outstanding advantages such as high integration, good beam quality, high energy conversion efficiency, and easy parameter adjustment. Quasi-continuous fiber lasers are an important type of fiber laser.
[0003] Traditional fiber lasers face a series of limitations in dealing with nonlinear effects, lacking effective means to control and adjust the degree of nonlinearity. This limits their adaptability to specific operational requirements or environmental changes. Furthermore, these lasers often struggle with frequency conversion and tuning, restricting their performance in terms of spectral range and application flexibility. Additionally, traditional fiber lasers are susceptible to external environmental disturbances, leading to polarization instability and limiting their reliability and performance in polarization-sensitive applications. Therefore, for applications requiring the maintenance of a specific polarization state, traditional fiber lasers have certain shortcomings in polarization control. Utility Model Content
[0004] In view of this, the purpose of this utility model is to propose a beam-splitting amplified quasi-continuous fiber laser to solve the problem of lacking effective means to control and adjust the degree of nonlinear effects.
[0005] To achieve the above objectives, this utility model provides a beam-splitting amplified quasi-continuous fiber laser, comprising: a laser body and an emitter body connected to one end of the laser body, wherein the laser body is used to emit seed laser, a control board is provided on the bottom of one side of the laser body, the emitter body is used to output lasers of various frequencies, and an emitter head is provided at the other end of the emitter body; a beam splitter is disposed inside one side of the emitter body and connected to the output end of the laser body; a plurality of optical path amplification channels, one end of which is connected to the output end of the beam splitter; and a beam combiner, one end of which is connected to the plurality of optical path amplification channels, and the other end of the beam combiner is connected to the emitter head.
[0006] Preferably, the optical path amplification channel is provided with, in sequence, a polarization controller for adjusting the polarization state of the laser signal, a wavelength controller for selecting or tuning the wavelength of the laser signal, an electro-optic modulator for adjusting or modulating the intensity or phase of the laser signal, a polarization holder for maintaining a specific polarization state of the laser signal, and an output coupler for exporting the amplified laser signal to the next stage of the system.
[0007] Preferably, the optical path amplification channel uses a high-refractive-index optical fiber material, and is doped with erbium rare earth elements. The optical path amplification channel is also equipped with a nonlinear crystal made of lithium niobate introduced along the inner wall of the optical fiber.
[0008] Preferably, one end of the beam combiner is fixedly connected to a phase modulator, which is connected to the other end of the plurality of optical path amplification channels.
[0009] Preferably, one end of the laser body is provided with an air inlet chamber, and multiple air intake fans are provided inside the air inlet chamber. Several heat dissipation grilles are provided above the other end of the laser body.
[0010] Preferably, the control board is provided with a number of input / output interfaces.
[0011] The beneficial effects of this utility model are:
[0012] 1. This type of beam-splitting amplified quasi-continuous fiber laser utilizes a lithium niobate nonlinear crystal introduced along the inner wall of the fiber within the optical path amplification channel, and a phase modulator placed on one side of the beam combiner. The use of lithium niobate allows for the control and reduction of nonlinear effects to a certain extent by optimizing factors such as the system's optical intensity. Furthermore, lithium niobate is a bidirectional nonlinear crystal, enabling frequency conversion of the optical signal. Through nonlinear effects, the frequency of the original optical signal can be converted to the frequency of the second harmonic, providing additional frequency selectivity. The nonlinear effect generated by the second harmonic allows for frequency control of the laser signal. Phase modulation is crucial for applications requiring specific frequencies. Furthermore, it effectively performs wavelength conversion, providing additional frequency tuning capabilities to the laser system. The phase modulator, in conjunction with the lithium niobate within the optical path amplification channel, counteracts the phase changes caused by the nonlinear effects of lithium niobate, thereby reducing the impact of nonlinearity on the system. The use of a phase modulator can also control frequency variations to some extent, helping to optimize the frequency conversion process and improve system stability and controllability. Combining a phase modulator with a lithium niobate crystal allows for the integration of phase modulation and frequency conversion, particularly beneficial for systems requiring simultaneous control of both phase and frequency.
[0013] 2. This type of beam-splitting amplified quasi-continuous fiber laser incorporates a polarization controller and a polarization holder. The polarization controller adjusts the polarization state of the laser signal to ensure the output polarization meets specific requirements. Simultaneously, the polarization holder maintains the specific polarization state of the laser signal within the optical path amplification channel. This combined use enables the system to achieve precise control of laser polarization, adapting to the polarization requirements of different application scenarios. Furthermore, in the optical path amplification channel, the laser signal, after amplification, may sometimes experience polarization changes due to external environmental influences. Through the adjustment of the polarization controller and the maintenance of the polarization holder, the system can better resist external disturbances and improve the long-term stability of polarization. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a frontal three-dimensional structural diagram of the present invention;
[0016] Figure 2 This is a schematic diagram of the reverse three-dimensional structure of this utility model;
[0017] Figure 3 This is a schematic diagram of the workflow structure of this utility model;
[0018] Figure 4 This is a schematic diagram of the optical path amplification channel structure of this utility model.
[0019] The diagram is marked as follows:
[0020] 1. Laser body; 2. Control board; 3. Emitter body; 4. Emitter head; 5. Air inlet chamber; 6. Air intake fan; 7. Heat dissipation grille; 8. Beam splitter; 9. Optical path amplification channel; 911. Polarization controller; 912. Wavelength controller; 913. Electro-optic modulator; 914. Polarization maintainer; 915. Output coupler; 10. Phase modulator; 11. Beam combiner. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.
[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0023] like Figures 1 to 4As shown, a beam-splitting amplified quasi-continuous fiber laser includes: a laser body 1 and a transmitter body 3 connected to one end of the laser body 1. The laser body 1 emits a seed laser. A control board 2 is provided on the bottom of one side of the laser body 1. The transmitter body 3 outputs lasers of various frequencies. A transmitter head 4 is provided at the other end of the transmitter body 3. A beam splitter 8 is located inside the transmitter body 3 and connected to the output end of the laser body 1. Several optical path amplification channels 9 are connected at one end to the output end of the beam splitter 8. A beam combiner 11 is connected at one end to the several optical path amplification channels 9 and at the other end to the transmitter head 4. The control board 2 is provided with several input and output interfaces. The laser body 1 generates and emits a seed laser beam through the control board 2. This seed laser serves as the initial laser signal and has relatively low power. This laser beam then enters the beam splitter 8 for beam splitting. Beam splitting allows multiple frequency laser signals to be amplified simultaneously, improving output power while maintaining frequency flexibility. It can also be used for each group of laser signals. The light undergoes independent frequency modulation to meet different application requirements. When the beam is split into multiple groups of lasers and enters the optical path amplification channel 9 for gradual amplification, the laser signal of each frequency can be precisely controlled through gradual amplification to achieve the desired output power and frequency characteristics. This maximizes the gain of the laser signal and improves the overall output power. The amplified laser enters the beam combiner 11 for merging. By merging multiple channels, high-power output of laser signals of different frequencies is achieved. The merged laser is emitted through the transmitter head 4. Through the coordinated work of the laser body 1 and the transmitter body 3, seed laser emission of multi-frequency laser signals is achieved. The beam splitting operation of the beam splitter 8 allows lasers of different frequencies to enter the optical path amplification channel 9 respectively. During the gradual amplification process, the power of each frequency laser signal is increased and its frequency characteristics are precisely controlled. Finally, the beam combiner 11 integrates the multi-channel laser signals into a high-power, multi-frequency laser beam output, which is emitted through the transmitter head 4. This fully utilizes the beam splitting and gradual amplification structure, achieving flexible adaptation to complex application scenarios and providing efficient and controllable multi-frequency laser output.
[0024] like Figure 3As shown, the optical amplification channel 9 contains, in sequence, a polarization controller 911 for adjusting the polarization state of the laser signal, a wavelength controller 912 for selecting or tuning the wavelength of the laser signal, an electro-optic modulator 913 for adjusting or modulating the intensity or phase of the laser signal, a polarization hold 914 for maintaining the specific polarization state of the laser signal, and an output coupler 915 for exporting the amplified laser signal to the next stage of the system. The optical amplification channel 9 uses high-refractive-index optical fiber material, and is internally doped with erbium rare-earth elements. A nonlinear crystal made of lithium niobate, introduced along the inner wall of the optical fiber, is also installed inside the optical amplification channel 9. The optical amplification channel 9 first receives the seed laser signal generated by the laser body 1, which contains the frequency information to be amplified. The polarization controller 911 adjusts the polarization state of the laser signal to ensure that the output laser signal meets specific polarization requirements. The wavelength controller 912 selects or tunes the wavelength of the laser signal, providing flexibility and adjustability to adapt to different application scenarios. The electro-optic modulator 913 adjusts or modulates the intensity or phase of the laser signal, achieving real-time adjustment to meet specific application requirements. The polarization hold 914 ensures that the laser signal maintains a specific polarization state within the channel, improving the stable control of polarization characteristics. It is worth noting that the polarization controller 911, by adjusting the polarization state of the laser signal, can ensure that the output polarization state meets specific requirements; simultaneously, the polarization hold 914 ensures that the laser signal maintains a specific polarization state within the channel. The optical path amplification channel 9 maintains a specific polarization state of the laser signal. This combination enables the system to achieve precise control of laser polarization, adapting to the polarization requirements of different application scenarios. Furthermore, in the optical path amplification channel 9, the laser signal, after amplification, may experience polarization changes due to external environmental influences. Through the adjustment of the polarization controller 911 and the holding of the polarization by the polarization maintainer 914, the system can better resist external disturbances and improve long-term polarization stability. Finally, the output coupler 915 outputs the amplified laser signal to the next stage of the system, enabling connection with other components for further processing or application. The optical path amplification channel 9 is internally doped with erbium rare earth elements and uses high-refractive-index optical fiber materials. The optical path amplification channel 9 amplifies the signal segment by segment, generating gain and increasing the intensity of the laser signal. The use of lithium niobate material can control and reduce nonlinear effects to a certain extent by optimizing factors such as the system's optical intensity. At the same time, in the process of reducing nonlinear effects, lithium niobate is also a bidirectional nonlinear crystal, which can realize the frequency conversion of optical signals. Through nonlinear effects, the frequency of the original optical signal can be converted into the frequency of the second harmonic, providing additional frequency selectivity. The nonlinear effect generated by the second harmonic can achieve modulation of the laser signal frequency, which is very important for applications that require specific frequencies. In addition, this is also equivalent to wavelength conversion, providing additional frequency tuning performance for the laser system.
[0025] like Figure 3 , Figure 4 As shown, one end of the beam combiner 11 is fixedly connected to a phase modulator 10, which is connected to the other end of several optical path amplification channels 9. The phase modulator 10 allows for real-time adjustment of the phase of the laser signal. By adjusting the phase of the laser output from multiple optical path amplification channels 9, the phase change caused by nonlinear effects can be compensated, maintaining the coherence and performance of the system. Moreover, by adjusting the phase, the quality of the combined laser signal can be improved, reducing phase distortion and distortion. At the same time, in conjunction with the lithium niobate inside the optical path amplification channels 9, the phase change caused by the nonlinear effect of lithium niobate can be offset, thereby reducing the impact of nonlinear effects on the system. Furthermore, the use of the phase modulator 10 can control the frequency change to a certain extent, which helps to optimize the frequency conversion process and improve the stability and controllability of the system. By combining the phase modulator 10 with the lithium niobate crystal, the integration of phase modulation and frequency conversion can be achieved, especially for systems that need to control both phase and frequency simultaneously.
[0026] like Figure 1 , Figure 2 As shown, an air inlet chamber 5 is provided at one end of the laser body 1, and multiple air intake fans 6 are installed inside the air inlet chamber 5. Several heat dissipation grilles 7 are provided above the other end of the laser body 1. The arrangement of the air inlet chamber 5 and the air intake fans 6 can introduce fresh air, enabling the heat inside the laser to be dissipated more effectively to the external environment, reducing the laser's operating temperature, improving the laser's stability and lifespan, and keeping the laser under optimal operating conditions. A stable operating temperature helps improve the laser's performance and ensures the stability and consistency of the output signal.
[0027] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.
[0028] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A beam-splitting amplified quasi-continuous fiber laser, characterized in that, include: The laser body (1) and the transmitter body (3) connected to one end of the laser body (1) are provided. The laser body (1) is used to emit seed laser. A control board (2) is provided on the bottom of one side of the laser body (1). The transmitter body (3) is used to output lasers of various frequencies. A transmitter head (4) is provided on the other end of the transmitter body (3). A beam splitter (8) is disposed on one side inside the transmitter body (3) and connected to the output end of the laser body (1); Several optical path amplification channels (9) are connected at one end to the output end of the beam splitter (8). Inside each optical path amplification channel (9) are arranged in sequence a polarization controller (911) for adjusting the polarization state of the laser signal, a wavelength controller (912) for selecting or tuning the wavelength of the laser signal, an electro-optic modulator (913) for adjusting or modulating the intensity or phase of the laser signal, a polarization holder (914) for maintaining a specific polarization state of the laser signal, and an output coupler (915) for exporting the amplified laser signal to the next stage of the system. A beam combiner (11) is connected at one end to several optical path amplification channels (9), and at the other end to the transmitter head (4).
2. The beam-splitting amplified quasi-continuous fiber laser according to claim 1, characterized in that, The optical path amplification channel (9) is made of high refractive index optical fiber material and is doped with erbium rare earth elements. The optical path amplification channel (9) is also equipped with a nonlinear crystal made of lithium niobate introduced along the inner wall of the optical fiber.
3. The beam-splitting amplified quasi-continuous fiber laser according to claim 1, characterized in that, One end of the beam combiner (11) is fixedly connected to a phase modulator (10) and the other end of several optical path amplification channels (9).
4. The beam-splitting amplified quasi-continuous fiber laser according to claim 1, characterized in that, One end of the laser body (1) is provided with an air inlet chamber (5), and multiple air intake fans (6) are provided inside the air inlet chamber (5). Several heat dissipation grilles (7) are provided above the other end of the laser body (1).
5. The beam-splitting amplified quasi-continuous fiber laser according to claim 1, characterized in that, The control board (2) is provided with several input and output interfaces.