High-power narrow-linewidth fiber laser
By directly making the cladding optical stripper at the melting point of the optical fiber, the complex structure of the high-power narrow linewidth fiber laser is solved, and the laser is miniaturized and integrated, improving mechanical stability and reliability.
Patent Information
- Application Number
- CN202421192706.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-29
AI Technical Summary
The structure of high-power narrow linewidth fiber lasers is complex, which is not conducive to miniaturization and integration, increasing the complexity, loss and maintenance requirements of the structure.
The cladding optical stripper is directly made at the melting point of the optical fiber, simplifying the optical path structure, reducing additional optical components and assembly steps, and integrating the cladding optical isolator using the frosted liquid corrosion method.
It reduces system complexity and assembly costs, improves mechanical stability and reliability, reduces volume and weight, realizes miniaturization and integration of lasers, and reduces the impact of thermal effects on laser performance.
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Figure CN222320803U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of optical fiber laser technology, and in particular to a high-power narrow-linewidth optical fiber laser. Background Art
[0002] With the rapid development of fiber laser technology, high-power narrow-linewidth fiber lasers have shown great potential in the fields of precision measurement, lidar, spectral analysis, and nonlinear optical applications due to their excellent performance characteristics such as low noise, good reliability, high electro-optical conversion efficiency, good coherence, and high beam quality. In order to achieve high-power narrow-linewidth laser output, it is usually necessary to use multiple fiber lasers for coherence or spectral synthesis, which puts higher requirements on the performance of a single laser, that is, to continuously improve the output power while ensuring the output beam quality.
[0003] High-power narrow-linewidth fiber lasers generally use seed sources and master oscillator power amplifiers (Master Oscillator Power Amplifier, MOPA) to increase the output power of fiber lasers. In this process, the seed laser first obtains sufficient power through a pre-amplifier, and then is sent to the main amplifier for further amplification. The optical fiber in the fiber laser contains not only the core that transmits the laser, but also the cladding. One of the functions of the cladding is to guide the pump light into the optical fiber to provide energy for the laser gain. However, in the laser output stage, in order to avoid interference and energy loss of the cladding light, the cladding light needs to be stripped from the signal light through a cladding light stripper.
[0004] In the related technologies known to the inventors, the cladding light stripper is connected to the optical path of the laser as an independent optical fiber device, and usually needs to be connected to other optical fiber components through fusion technology. Although this technical solution can achieve the stripping function, it will increase the structural complexity of the laser, because each additional fusion point may introduce loss, instability, and difficulty in alignment and installation. At the same time, it will also take up more physical space, which is not conducive to the miniaturization and integration of the system. Utility Model Content
[0005] The present application provides a high-power narrow-linewidth fiber laser, which solves the problem that the high-power narrow-linewidth fiber laser in the related art has a complex structure and is not conducive to miniaturization and integration.
[0006] In order to achieve the above objectives, this application adopts the following technical solutions:
[0007] Provided is a high-power narrow-linewidth fiber laser, comprising:
[0008] A narrow linewidth laser seed source, wherein the narrow linewidth laser seed source optical fiber is connected to a pre-amplification system, and the pre-amplification system optical fiber is connected to a main amplification system;
[0009] The pre-amplification system comprises a polarization-maintaining pre-amplifier, and the polarization-maintaining pre-amplifier is connected to a polarization-maintaining circulator; the optical fiber fusion region at the output end of the pre-amplification system is integrated with a first polarization-maintaining cladding optical isolator;
[0010] The main amplification system comprises a polarization-maintaining gain optical fiber, polarization-maintaining combiners are arranged at both ends of the polarization-maintaining gain optical fiber, and a second polarization-maintaining cladding optical isolator is integrated in the fusion region of the output end of the polarization-maintaining gain optical fiber.
[0011] In a first possible implementation manner, the pre-amplification system further includes a polarization-maintaining mode matcher;
[0012] The polarization-maintaining mode matcher is connected to the output end of the polarization-maintaining circulator, the polarization-maintaining mode matcher is connected to the polarization-maintaining gain optical fiber, and the first polarization-maintaining cladding optical isolator is configured in the optical fiber fusion region between the polarization-maintaining mode matcher and the polarization-maintaining gain optical fiber.
[0013] Based on the first possible implementation manner, in a second possible implementation manner, the pre-amplification system further includes a reverse light detector; and the reverse light detector is connected to an output end of the polarization-maintaining circulator.
[0014] In a third possible implementation manner, the pre-amplification system further includes a polarization-maintaining white noise signal phase modulator; the polarization-maintaining white noise signal phase modulator is configured between the narrow linewidth laser seed source and the polarization-maintaining pre-amplifier.
[0015] In a fourth possible implementation, the main amplification system further includes a polarization-maintaining optical fiber output end cap;
[0016] The polarization-maintaining optical fiber output end cap is connected to the polarization-maintaining gain optical fiber, and the second polarization-maintaining cladding optical isolator is configured in the optical fiber fusion splicing area between the polarization-maintaining optical fiber output end cap and the polarization-maintaining gain optical fiber.
[0017] Based on any of the above possible implementations, in a fifth possible implementation, the narrow linewidth laser seed source outputs a seed light beam width of less than 10 kHz, and the maximum output power is 100 mW.
[0018] Based on any of the above possible implementations, in a sixth possible implementation,
[0019] The first polarization-maintaining cladding optical isolator and the second polarization-maintaining cladding optical isolator are integrated in the light selected area by adopting the method of frosting liquid corroding optical fiber.
[0020] In a seventh possible implementation manner, the polarization-maintaining beam combiner includes a forward polarization-maintaining (6+1)*1 beam combiner and a backward polarization-maintaining (6+1)*1 beam combiner.
[0021] The high-power narrow-linewidth fiber laser of the embodiment of the present application directly manufactures a cladding light stripper at the melting point of the fiber laser, which simplifies the overall structure and optical path structure of the laser, reduces additional optical components and assembly steps, reduces the complexity and assembly cost of the system, and also reduces the volume and weight, which is conducive to the miniaturization and integration of the laser.
[0022] The high-power narrow-linewidth fiber laser of the embodiment of the present application reduces the loss and failure points that may be introduced by the fiber connector (melting point) and additional components, improves the mechanical stability and long-term reliability of the system, and reduces maintenance requirements and operational risks. It can better guide and dissipate the heat energy generated during the pumping process, reduce the impact of thermal effects on laser performance, such as avoiding mode instability and heat-induced damage.
[0023] In addition, the high-power narrow-linewidth fiber laser of the embodiment of the present application provides a higher degree of design freedom, and the size and shape of the double-clad optical isolator can be flexibly configured according to different application requirements, such as specific power levels, linewidth requirements or environmental conditions, to achieve optimal performance matching. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 A schematic structural block diagram of a high-power narrow-linewidth fiber laser provided in an embodiment of the present application;
[0025] Figure 2 A schematic flow chart of a method for preparing a high-power narrow-linewidth fiber laser provided in an embodiment of the present application.
[0026] Reference numerals:
[0027] Narrow linewidth laser seed source 1; pre-amplification system 200; main amplification system 300; polarization-maintaining white noise signal phase modulator 2; polarization-maintaining pre-amplifier 3; polarization-maintaining circulator 4; reverse light detector 5; polarization-maintaining mode matcher 6; first polarization-maintaining cladding optical isolator 7; main amplification system pump light 8; forward polarization-maintaining (6+1)*1 combiner 9; polarization-maintaining gain fiber 10; backward polarization-maintaining (6+1)*1 combiner 11; second polarization-maintaining cladding optical isolator 12 and polarization-maintaining fiber output end cap 13. DETAILED DESCRIPTION
[0028] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purpose, the technical solutions in the embodiments of the present application are clearly described. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present application.
[0029] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.
[0030] The description of the method flow in the specification of this application and the steps of the flowchart in the drawings of the specification of this application do not have to be strictly executed according to the step numbers, and the method steps can be executed in a different order. Moreover, some steps can be omitted, multiple steps can be combined into one step, and / or one step can be decomposed into multiple steps.
[0031] The high-power narrow-linewidth fiber laser provided in the embodiment of the present application is described in detail below in conjunction with the accompanying drawings and preferred embodiments.
[0032] First, the application scenarios of the high-power narrow-linewidth fiber laser according to the embodiments of the present application are introduced.
[0033] High-power narrow-linewidth fiber lasers combine high output power with extremely narrow spectral linewidth characteristics, and are mainly used in applications that require both strong light energy output and high stability and purity of the light wavelength. Specifically, the laser is required to output relatively high energy, usually at the kilowatt (kW) level or higher, and at the same time, the spectral linewidth is required to be very narrow.
[0034] At present, the design of narrow-linewidth fiber lasers based on seed source and master oscillator power amplifier (MOPA) architecture has become an effective way to increase the output power of fiber lasers. This technical solution significantly improves the output power of the laser by adding seed light to multi-stage pre-amplification and main amplification, while maintaining the narrow linewidth characteristics. In the research of fiber lasers in related technologies, some technical solutions such as seed source optimization, signal modulation, pump light management, optical path structure design and nonlinear effect suppression are continuously promoted to improve power and performance. For example:
[0035] The solution of seed light plus multi-stage pre-amplification and main amplification: the seed laser source undergoes multi-stage pre-amplification before entering the main amplifier to achieve high-power output. At the same time, ytterbium-doped fiber with a specific length and diameter is used as the gain medium to achieve narrow linewidth laser output.
[0036] Signal modulation technology: Utilize the cascade modulation of white noise signal and sinusoidal signal to generate a narrow linewidth seed source to effectively control the laser linewidth and improve the spectral purity of the laser.
[0037] Backward pump amplification and optical path optimization: By optimizing the injection mode of pump light and the coupling between pump light and signal light, the pump efficiency and laser output power are improved. By adding a chirped Bragg grating in the optical path to suppress transverse mode instability (TMI), the laser performance is further optimized.
[0038] Phase modulation and bidirectional pumping technology: Using a phase-modulated single-frequency laser as a seed source, combined with bidirectional pumping, effectively improves the laser power output and beam quality while maintaining the narrow linewidth characteristics. The bidirectional pumping structure can provide pump energy more evenly, reduce thermal effects, and improve beam quality.
[0039] Polarization-maintaining fiber and special fiber structure design: Using polarization-maintaining ytterbium-doped fiber, by controlling the fiber's geometric structure and material properties, effectively suppresses nonlinear effects, maintains narrow linewidth and near single-mode output. The temperature distribution in the fiber is controlled by bending the fiber design to further suppress the TMI effect.
[0040] Pump light management: Emphasis on efficient management of pump light, including the selection of pump source, coupling method of pump light and precise control of pump power. Multi-stage pre-amplification and bidirectional pumping methods, as well as specific pump light combiner design are adopted to achieve 5kW-class narrow-linewidth polarized fiber laser output.
[0041] In the above-mentioned high-power narrow-linewidth fiber lasers, a cladding light stripper must be added to strip the cladding light when the laser passes through the main amplifier and the output end cap, which not only increases the volume and weight of the laser, but also may lead to higher signal loss and instability factors. Especially under high-power operating conditions, the thermal effects and mechanical stresses of the fiber fusion points become key factors limiting the reliability and life of the system. Especially when pursuing narrow linewidth output, higher requirements are placed on the stability of the laser. Narrow linewidth lasers usually rely on high-precision spectral selection elements (such as Bragg gratings) and strict temperature control measures to suppress linewidth broadening. However, the added fiber devices and fusion links will introduce additional noise sources and optical deviations, which counteract the realization of narrow linewidth.
[0042] Therefore, the present application proposes a high-power narrow-linewidth fiber laser, which directly makes a cladding light stripper at the melting point of the optical fiber, thereby reducing the welding of the device and simplifying the optical path structure, providing a new solution for the miniaturization and high performance of high-power narrow-linewidth fiber lasers.
[0043] See also Figure 1 , Figure 1A schematic structural block diagram of a high-power narrow-linewidth fiber laser provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the high-power narrow-linewidth fiber laser of the embodiment of the present application includes:
[0044] A narrow linewidth laser seed source 1, the narrow linewidth laser seed source 1 is optically connected to a pre-amplification system 200, and the pre-amplification system 200 is optically connected to a main amplification system 300;
[0045] The pre-amplification system 200 includes a polarization-maintaining pre-amplifier 3, which is connected to a polarization-maintaining circulator 4; the optical fiber fusion region at the output end of the pre-amplification system 200 is integrated with a first polarization-maintaining cladding optical isolator 7; the main amplification system 300 includes a polarization-maintaining gain optical fiber 10, both ends of the polarization-maintaining gain optical fiber 10 are provided with polarization-maintaining combiners, and the fusion region at the output end of the polarization-maintaining gain optical fiber 10 is integrated with a second polarization-maintaining cladding optical isolator 12.
[0046] Specifically, the narrow linewidth laser seed source 1 is the starting end of the laser, used to generate initial laser pulses or continuous wave lasers, namely seed light; the seed light has a spectral linewidth lower than a set value, namely the narrow linewidth laser seed source 1 generates an initial laser pulse with a narrow linewidth.
[0047] Exemplarily, the narrow linewidth laser seed source 1 outputs seed light with a linewidth of less than 10 kHz and a maximum output power of 100 mW.
[0048] The narrow linewidth laser seed source 1 is connected to a pre-amplification system 200 through an optical fiber. The pre-amplification system 200 is used to enhance the power of the seed light, prepare for the subsequent main amplification, and maintain the beam quality. The pre-amplification system 200 includes a polarization-maintaining white noise signal phase modulator 2, a polarization-maintaining pre-amplifier 3, a polarization-maintaining circulator 4, a reverse light detector 5, a polarization-maintaining mode matcher 6, and a first polarization-maintaining cladding optical isolator 7.
[0049] Among them, the polarization-maintaining white noise signal phase modulator 2 is connected to the output optical fiber of the narrow linewidth laser seed source 1, which is used to further compress the linewidth and ensure the monochromaticity and coherence of the laser. The initial laser pulse with a narrow linewidth output by the seed source further compresses the linewidth of the laser through the polarization-maintaining white noise signal phase modulator 2 to enhance its monochromaticity. The polarization-maintaining white noise signal phase modulator 2 is optically connected to a polarization-maintaining preamplifier 3 for enhancing the power of the seed light. The polarization-maintaining preamplifier 3 is optically connected to a polarization-maintaining circulator 4 for maintaining the stability of the beam quality and polarization state. The polarization-maintaining circulator 4 is optically connected to a reverse light detector 5 used in conjunction with it. At the same time, the output optical fiber of the polarization-maintaining circulator 4 is optically connected to a polarization-maintaining mode matcher 6 for monitoring and optimizing feedback control during the amplification process to ensure the stability of the laser performance and the efficient transmission of power.
[0050] The pre-amplification system 200 is optically connected to the main amplification system 300. The first polarization-maintaining cladding optical isolator 7 is used to separate or remove the pump light at the output end of the pre-amplification system in the optical path, ensuring that only the signal light is transmitted along the core area of the optical fiber. The first polarization-maintaining cladding optical isolator 7 is integrated in the optical fiber fusion region between the pre-amplification system 200 and the main amplification system 300, that is, the optical fiber fusion region between the polarization-maintaining mode matcher 6 and the polarization-maintaining gain optical fiber 10. The first polarization-maintaining cladding optical isolator 7 is a cladding light stripper made directly at the melting point of the optical fiber, which means that the light stripping function is integrated at a specific position of the optical fiber (usually the area where the optical fiber is fused or processed), rather than adding an independent physical device, so as to simplify the system design and reduce potential losses.
[0051] In the specific implementation process, the cladding light stripper can be made by etching the optical fiber with a frosting liquid. In the specific operation, the frosting liquid is applied to the selected area of the optical fiber, because the frosting liquid can react chemically with the silica cladding of the optical fiber, thereby selectively removing or etching the cladding without affecting the core layer. This process only removes the cladding without damaging the core layer or changing other properties of the optical fiber. By controlling the etching time, concentration and etching conditions, the expected cladding stripping effect can be obtained, thereby forming a precise optical channel that only allows the signal light in the core layer to pass through, while removing the pump light or noise light in the cladding.
[0052] The main amplification system 300 is used to amplify the seed light to the required high power level through efficient pump energy transfer, and includes: a forward polarization-maintaining (6+1)*1 combiner 9, a polarization-maintaining gain fiber 10, a backward polarization-maintaining (6+1)*1 combiner 11, a second polarization-maintaining cladding optical isolator 12, and a polarization-maintaining fiber output end cap 13.
[0053] Wherein, the first polarization-maintaining cladding optical isolator 7 is connected to the polarization-maintaining gain optical fiber 10;
[0054] The forward polarization-maintaining (6+1)*1 combiner 9 is arranged on the side of the polarization-maintaining gain fiber 10 close to the pre-amplification system 200, and the backward polarization-maintaining (6+1)*1 combiner 11 is arranged on the side of the polarization-maintaining gain fiber 10 close to the main amplification system 300; the polarization-maintaining gain fiber 10 can be optimized by length and core diameter design to achieve high-power amplification, and the main amplification system pump light 8 generated by the pump source is coupled to the polarization-maintaining gain fiber 10 through two polarization-maintaining combiners (i.e., the forward polarization-maintaining (6+1)*1 combiner 9 and the backward polarization-maintaining (6+1)*1 combiner 11), so as to achieve efficient energy transfer and amplify the seed light. The output optical fiber of the polarization-maintaining gain fiber 10 is connected to a polarization-maintaining fiber output end cap 13, which is used to protect the laser output interface and shape or control the direction of the light beam. The second polarization-maintaining cladding optical isolator 12 is arranged in the fiber fusion region between the polarization-maintaining fiber output end cap 13 and the polarization-maintaining gain fiber 10. The second polarization-maintaining cladding optical isolator 12 separates or removes the pump light at the output end of the main amplification system in the optical path. The main difference between the second polarization-maintaining cladding optical isolator 12 and the first polarization-maintaining cladding optical isolator 7 is the arrangement position, which will not be described here.
[0055] The working principle of the high-power narrow-linewidth fiber laser in the embodiment of the present application is as follows:
[0056] A narrow linewidth laser seed source 1 with a linewidth of less than 10kHz and a maximum output power of 100mW passes through a white noise signal phase modulator 2 to achieve seed light beam width modulation. The seed light after linewidth modulation passes through a pre-amplifier 3 to achieve optical power amplification to an output power of more than 20W. The pre-amplified laser passes through a polarization-maintaining circulator 4, which can not only ensure the stable output of polarized light, but also realize reverse light monitoring through a reverse light detector 5; then the pre-amplified light passes through a polarization-maintaining mode matcher 6, and finally enters the laser main amplification system 300 through a first cladding light stripper 7; in the main amplification system 300, the main amplification system pump light 8 is injected into a polarization-maintaining gain fiber 10 through a polarization-maintaining combiner (a forward polarization-maintaining (6+1)*1 combiner 9 and a backward polarization-maintaining (6+1)*1 combiner 11) to achieve seed light power amplification; the amplified power passes through a second cladding optical isolator 12, and finally is output through a fiber output end cap 13.
[0057] Compared with the related technologies of external cladding light strippers known to the inventors, the high-power narrow-linewidth fiber laser in the embodiment of the present application directly manufactures the cladding light stripper at the melting point of the fiber laser, which simplifies the overall structure and optical path structure of the laser, reduces additional optical components and assembly steps, reduces the complexity and assembly cost of the system, and also reduces the volume and weight, which is conducive to the miniaturization and integration of the laser.
[0058] The high-power narrow-linewidth fiber laser of the embodiment of the present application reduces the loss and failure points that may be introduced by the fiber connector (melting point) and additional components, improves the mechanical stability and long-term reliability of the system, and reduces maintenance requirements and operational risks. It can better guide and dissipate the heat energy generated during the pumping process, reduce the impact of thermal effects on laser performance, such as avoiding mode instability and heat-induced damage.
[0059] In addition, the high-power narrow-linewidth fiber laser of the embodiment of the present application provides a higher degree of design freedom, and the size and shape of the double-clad optical isolator can be flexibly configured according to different application requirements, such as specific power levels, linewidth requirements or environmental conditions, to achieve optimal performance matching.
[0060] See also Figure 2 The present invention provides a method for preparing a high-power narrow-linewidth fiber laser. The method comprises the following steps:
[0061] Step 101, configuring a narrow linewidth laser seed source optical fiber connected to a pre-amplification system, the pre-amplification system is used to enhance the power of the seed light, the pre-amplification system optical fiber is connected to a main amplification system, the main amplification system includes a polarization-maintaining gain optical fiber, and is used to enhance the power of the light output by the pre-amplification system;
[0062] Determining an integration position of a first polarization-maintaining cladding optical isolator based on an optical fiber fusion splicing region at an output end of the pre-amplification system;
[0063] Determining the integration position of the second polarization-maintaining cladding optical isolator based on the fusion region at the output end of the polarization-maintaining gain optical fiber;
[0064] The pre-amplification system includes a polarization-maintaining pre-amplifier, the polarization-maintaining pre-amplifier is connected to a polarization-maintaining circulator; the output end of the polarization-maintaining circulator is connected to a polarization-maintaining mode matcher, the polarization-maintaining mode matcher is connected to the polarization-maintaining gain optical fiber, and the first polarization-maintaining cladding optical isolator is configured in a fiber fusion region between the polarization-maintaining mode matcher and the polarization-maintaining gain optical fiber;
[0065] The main amplification system further comprises a polarization-maintaining fiber output end cap, which is connected to the polarization-maintaining gain fiber, and the second polarization-maintaining cladding optical isolator is arranged in the fiber fusion region between the polarization-maintaining fiber output end cap and the polarization-maintaining gain fiber.
[0066] Step 102, coating a frosting liquid on the selected integration location, and selectively removing at least a portion of the cladding material in the frosting area of the integration location.
[0067] Based on the design of laser transmission efficiency and mechanical strength, a specific melting point position on the optical fiber that meets the conditions is determined, and the position is suitable for making a light stripper. The frosting layer will be selectively removed in a subsequent step to expose the optical fiber cladding.
[0068] During the specific implementation of this step, it is necessary to continuously monitor the cladding thinning process and accurately control the removal depth or diameter according to the pre-calculated corrosion rate or thinning rate until the predetermined size is reached.
[0069] Step 103, removing the frosting liquid on the surface of the optical fiber.
[0070] Appropriate solvents or cleaning methods can be used to thoroughly remove residues on the surface of the optical fiber to ensure the purity of the optical path.
[0071] Step 104, check the light transmission quality of the integrated position; check the temperature distribution of the optical fiber when the light is passing through.
[0072] Use a spectrum analyzer, microscope and other equipment to check the light transmission quality of the frosted points to ensure that there is no obvious loss or scattering; use a thermometer to check the temperature distribution of the optical fiber when the light is passing through it to confirm that there are no hot spots or temperature mutations caused by improper handling.
[0073] Step 105, embedding the optical fiber segment that meets the optical transmission quality and temperature distribution conditions into the glass tube to form a packaging structure.
[0074] Through the detailed steps of the above high-power narrow-linewidth fiber laser preparation method, the cladding light stripper is made by using the fiber frosting method at the melting point of the fiber. The fiber corrosion rate is determined, the time is calculated, and the fiber cladding is corroded to a suitable size. After the corrosion is completed, the bare fiber is cleaned and tested through light. The frosting point and coating layer cut of the bare fiber are mainly tested. When there is no hot spot mutation point in the thermometer test, the cladding light stripper is encapsulated by using a glass tube, and the cladding light stripper is completed. Compared with the traditional assembly of independent components, the integrated design of frosting and encapsulation directly on the optical fiber simplifies the manufacturing process, reduces the assembly links, reduces the production cost and time, and is also convenient for mass production. This method provides a high degree of customization, and the position, size, and packaging material selection of the cladding stripper can be adjusted according to specific application requirements to adapt to different power levels, line width requirements and environmental conditions, thereby increasing the scope of application of the laser.
[0075] Through the description of the specific implementation methods, a deeper and more specific understanding of the technical means and effects adopted by the present application to achieve the predetermined purpose should be obtained. However, the accompanying drawings are only for reference and illustration purposes and are not used to limit the present application.
[0076] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.
[0077] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.
Claims
1. A high-power narrow-linewidth fiber laser, characterized in that: include: A narrow linewidth laser seed source, wherein the narrow linewidth laser seed source optical fiber is connected to a pre-amplification system, and the pre-amplification system optical fiber is connected to a main amplification system; The pre-amplification system comprises a polarization-maintaining pre-amplifier, and the polarization-maintaining pre-amplifier is connected to a polarization-maintaining circulator; the optical fiber fusion region at the output end of the pre-amplification system is integrated with a first polarization-maintaining cladding optical isolator; The main amplification system comprises a polarization-maintaining gain optical fiber, polarization-maintaining combiners are arranged at both ends of the polarization-maintaining gain optical fiber, and a second polarization-maintaining cladding optical isolator is integrated in the fusion region of the output end of the polarization-maintaining gain optical fiber.
2. The high-power narrow-linewidth fiber laser according to claim 1, characterized in that: The pre-amplification system also includes a polarization-maintaining mode matcher; The polarization-maintaining mode matcher is connected to the output end of the polarization-maintaining circulator, the polarization-maintaining mode matcher is connected to the polarization-maintaining gain optical fiber, and the first polarization-maintaining cladding optical isolator is configured in the optical fiber fusion region between the polarization-maintaining mode matcher and the polarization-maintaining gain optical fiber.
3. The high-power narrow-linewidth fiber laser according to claim 2, characterized in that: The pre-amplification system further comprises a reverse light detector; the reverse light detector is connected to the output end of the polarization-maintaining circulator.
4. The high-power narrow-linewidth fiber laser according to claim 1, characterized in that: The pre-amplification system further includes a polarization-maintaining white noise signal phase modulator; the polarization-maintaining white noise signal phase modulator is configured between the narrow linewidth laser seed source and the polarization-maintaining pre-amplifier.
5. The high-power narrow-linewidth fiber laser according to claim 1, characterized in that: The main amplification system also includes a polarization-maintaining optical fiber output end cap; The polarization-maintaining optical fiber output end cap is connected to the polarization-maintaining gain optical fiber, and the second polarization-maintaining cladding optical isolator is configured in the optical fiber fusion splicing area between the polarization-maintaining optical fiber output end cap and the polarization-maintaining gain optical fiber.
6. The high-power narrow-linewidth fiber laser according to any one of claims 1 to 5, characterized in that: The narrow linewidth laser seed source outputs a seed light beam width of less than 10kHz and a maximum output power of 100mW.
7. The high-power narrow-linewidth fiber laser according to any one of claims 1 to 5, characterized in that: The first polarization-maintaining cladding optical isolator and the second polarization-maintaining cladding optical isolator are integrated in the light selected area by adopting the method of frosting liquid corroding optical fiber.
8. The high-power narrow-linewidth fiber laser according to claim 1, characterized in that: The polarization-maintaining combiner includes a forward polarization-maintaining (6+1)*1 combiner and a backward polarization-maintaining (6+1)*1 combiner.