Narrow linewidth laser external cavity coupling system and method based on linewidth test feedback

Abstract

The invention discloses a narrow linewidth laser external cavity coupling system and a narrow linewidth laser external cavity coupling method based on linewidth test feedback, external cavity coupling is carried out by adopting a self-feedback mechanism, and through real-time feedback of optical power, the laser can be ensured to be in an optimal working state when the linewidth is measured, so that the accuracy of linewidth measurement can be improved, and the measurement accuracy is improved. Reliable data can be provided for subsequent adjustment of the position of the external cavity; after the line width measurement is completed, the outer cavity clamp displacement table can be controlled to adjust the position of the outer cavity of the narrow-line-width laser according to the line width until the line width of the laser output by the outer cavity reaches a preset target, and the optimal coupling position of the outer cavity can be determined; therefore, the optical power and the laser line width are integrated to perform external cavity coupling, the actual performance can be ensured to conform to the design index, the parameter consistency is ensured, the whole process is automatic and does not need personnel intervention, the subjective influence of operators is effectively avoided, and the process stability and the production efficiency are improved.

Description

Technical Field

[0001] This invention belongs to the fields of narrow-linewidth laser external cavity coupling and semiconductor laser technology, specifically relating to a narrow-linewidth laser external cavity coupling system and method based on linewidth test feedback. Background Technology

[0002] For 1.5μm narrow-linewidth lasers used in high-precision fiber optic sensing and coherent lidar applications, the precision assembly of the external cavity coupling system directly affects the device's linewidth performance and production yield. Current coupling technologies suffer from the following prominent drawbacks: Current processes generally employ manual adjustment of a six-dimensional displacement stage to achieve external cavity mirror coupling. Operators must repeatedly adjust the collimation angle based on feedback from an optical power meter. This method suffers from technical bottlenecks such as long adjustment cycles, large accuracy variations, and poor operational reproducibility, making it difficult to adapt to the demands of large-scale production. Furthermore, conventional systems only use maximizing optical power as the coupling termination condition, neglecting the dynamic changes in linewidth parameters with the cavity mirror position, leading to deviations in actual device performance from design specifications. Therefore, traditional discrete process systems relying on manual experience can no longer meet the stringent requirements of next-generation optoelectronic devices for process stability, production efficiency, and parameter consistency. Thus, based on the aforementioned shortcomings, providing a narrow-linewidth laser external cavity coupling system that can satisfy process stability, production efficiency, and parameter consistency has become an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide a narrow-linewidth laser external cavity coupling system and method based on linewidth test feedback, in order to solve the problems of low production efficiency, poor process stability and parameter consistency in the existing technology.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, a narrow-linewidth laser external cavity coupling system based on linewidth test feedback is provided, comprising: An external cavity fixture displacement stage is provided, wherein a narrow linewidth laser external cavity is provided on the external cavity fixture displacement stage, and the external cavity fixture displacement stage is used to adjust the position of the narrow linewidth laser external cavity; The external cavity of the narrow linewidth laser is used to receive the laser emitted by the narrow linewidth laser and to narrow the linewidth of the received laser to output a narrow linewidth laser. A laser measurement module is used to measure the first laser parameters of the narrow linewidth laser and feed the first laser parameters back to the coupling control module, wherein the first laser parameters include the optical power of the narrow linewidth laser; The coupling control module is used to adjust the driving parameters of the narrow linewidth laser according to the first laser parameters to update the first laser parameters of the narrow linewidth laser, and send a parameter test command to the laser measurement module when the first laser parameters meet the preset conditions, wherein the preset conditions include the optical power reaching the maximum power. The laser measurement module is also used to continuously measure the second laser parameter of the narrow linewidth laser after receiving the parameter test command, and send the second laser parameter to the coupling control module, wherein the second laser parameter is the laser linewidth; The coupling control module is also used to control the external cavity fixture displacement stage to adjust the position of the narrow linewidth laser external cavity based on the second laser parameters until the received second laser parameters reach the preset target, thereby obtaining the optimal coupling position of the external cavity and fixing the narrow linewidth laser external cavity at the optimal coupling position of the external cavity to complete the coupling of the narrow linewidth laser external cavity.

[0005] Based on the above disclosure, this invention places the external cavity of a narrow-linewidth laser on an external cavity fixture displacement stage. The position of the narrow-linewidth laser's external cavity is adjusted using the external cavity fixture displacement stage. Simultaneously, a laser measurement module is provided to measure the first laser parameters (including optical power, i.e., the laser's output power) of the narrow-linewidth laser output from the external cavity of the narrow-linewidth laser, and feeds this data back to the coupling control module in real time. The coupling control module adjusts the driving parameters of the narrow-linewidth laser based on the first laser parameters to achieve real-time adjustment of the first laser parameters. When the coupling control module detects that the first laser parameters meet a preset value... When the optical power reaches its maximum, a parameter test command is sent to the laser measurement module. Upon receiving this command, the laser measurement module continuously measures the second laser parameter (the laser linewidth) of the narrow-linewidth laser and feeds it back to the coupling control module in real time. Then, the coupling control module controls the external cavity fixture displacement stage to adjust the position of the narrow-linewidth laser's external cavity based on the laser linewidth until the received laser linewidth reaches the preset target, at which point the optimal coupling position of the external cavity can be determined. Finally, the narrow-linewidth laser's external cavity is fixed at the optimal coupling position, thus completing the coupling of the narrow-linewidth laser's external cavity.

[0006] Through the above design, this invention integrates optical power and laser linewidth for external cavity coupling, ensuring that the actual performance meets the design specifications and that parameter consistency is guaranteed. Moreover, the entire coupling process is fully automated, requiring no human intervention, effectively avoiding the subjective influence of operators, thereby improving process stability and production efficiency. Based on this, this invention can meet the stringent requirements of next-generation optoelectronic devices for process stability, production efficiency, and parameter consistency, making it highly suitable for large-scale application and promotion.

[0007] In one possible design, the first laser parameter also includes: spectral characteristic information of the narrow linewidth laser, wherein the coupling control module is used to send the parameter test command to the laser measurement module when the optical power of the narrow linewidth laser reaches the maximum power and the spectral characteristic information meets the preset spectral conditions.

[0008] In one possible design, the laser measurement module includes: an optical power meter and a spectrometer; An optical power meter is used to measure the optical power of the narrow linewidth laser and feed the optical power back to the coupling control module; A spectrometer is used to perform spectral analysis on the narrow linewidth laser, obtain spectral characteristic information, and feed it back to the coupling control module so that the coupling control module can adjust the driving parameters of the narrow linewidth laser according to the optical power and the spectral characteristic information.

[0009] In one possible design, the laser measurement module further includes a linewidth tester, wherein the linewidth tester is used to measure the laser linewidth of the narrow linewidth laser output from the external cavity of the narrow linewidth laser after receiving the parameter test command, and send the laser linewidth as a second laser parameter to the coupling control module.

[0010] In one possible design, the external cavity fixture displacement stage includes: an external cavity fixture and a displacement mechanism; The narrow linewidth laser outer cavity is connected to the displacement mechanism via the outer cavity clamp, and the displacement mechanism includes an X-axis displacement stage, a Y-axis displacement stage, and a Z-axis displacement stage.

[0011] In one possible design, it also includes: a dispensing machine, wherein the coupling control module is communicatively connected to the dispensing machine and is used to send a dispensing command to the dispensing machine after determining the optimal coupling position of the external cavity; A dispensing machine is used to release adhesive to the optimal coupling position of the outer cavity after receiving the dispensing instruction, so as to fix the outer cavity of the narrow linewidth laser at the optimal coupling position of the outer cavity.

[0012] In one possible design, it also includes a display module, wherein the display module is communicatively connected to the coupling control module for visually displaying the first laser parameters and the second laser parameters.

[0013] Secondly, a method for coupling the external cavity of a narrow-linewidth laser based on linewidth test feedback is provided. This method is executed based on a coupling control module in the narrow-linewidth laser external cavity coupling system based on linewidth test feedback, or any possible design of the first aspect, and the method includes: The first laser parameters of the narrow linewidth laser output from the external cavity of the narrow linewidth laser are obtained, wherein the first laser parameters include the optical power of the narrow linewidth laser, and the external cavity of the narrow linewidth laser is disposed on the external cavity fixture displacement stage. Based on the first laser parameters, the driving parameters of the narrow linewidth laser are adjusted to update the first laser parameters of the narrow linewidth laser. When the first laser parameters meet the preset conditions, a parameter test command is sent to the laser measurement module so that the laser measurement module continuously measures the second laser parameters of the narrow linewidth laser after receiving the parameter test command and sends the second laser parameters to the coupling control module. The second laser parameter is the laser linewidth, and the preset conditions include the optical power reaching the maximum power. Based on the second laser parameters, the external cavity fixture displacement stage is controlled to adjust the position of the narrow linewidth laser external cavity until the received second laser parameters reach the preset target, thus obtaining the optimal coupling position of the external cavity. The narrow linewidth laser external cavity is then fixed at the optimal coupling position to complete the coupling of the narrow linewidth laser external cavity.

[0014] Thirdly, a narrow-linewidth laser external cavity coupling device based on linewidth test feedback is provided. Taking the device as an electronic device as an example, it includes a memory, a processor, and a transceiver that are connected in sequence. The memory is used to store computer programs, the transceiver is used to send and receive messages, and the processor is used to read the computer programs and execute the narrow-linewidth laser external cavity coupling method based on linewidth test feedback as described in the second aspect.

[0015] Fourthly, a storage medium is provided, on which instructions are stored, which, when executed on a computer, perform the narrow-linewidth laser external cavity coupling method based on linewidth test feedback as described in the second aspect.

[0016] Fifthly, a computer program product containing instructions is provided, which, when executed on a computer, causes the computer to perform the narrow-linewidth laser external cavity coupling method based on linewidth test feedback as described in the second aspect.

[0017] Beneficial effects: (1) This invention employs a self-feedback mechanism for external cavity coupling. First, the optical power of the narrow-linewidth laser output from the external cavity is measured in real time to adjust the driving parameters of the narrow-linewidth laser, thereby achieving optical power adjustment. When the laser reaches its maximum power, linewidth measurement continues. This real-time optical power feedback ensures the laser is in optimal working condition during linewidth measurement, improving the accuracy of the measurement and providing reliable data for subsequent external cavity position adjustment. After linewidth measurement, the external cavity fixture displacement stage can be controlled to adjust the narrow-linewidth laser based on the linewidth. The optimal coupling position of the external cavity can be determined when the linewidth of the laser output from the external cavity reaches the preset target, thus achieving external cavity coupling. Therefore, this invention integrates optical power and laser linewidth for external cavity coupling, ensuring that actual performance meets design specifications and parameter consistency. Furthermore, the entire process is fully automated, requiring no human intervention and effectively avoiding the subjective influence of operators, thereby improving process stability and production efficiency. Based on this, this invention can meet the stringent requirements of next-generation optoelectronic devices for process stability, production efficiency, and parameter consistency, making it highly suitable for large-scale application and promotion.

[0018] (2) The present invention also measures the spectral characteristics of the narrow linewidth laser and only performs linewidth measurement when its optical power meets the maximum power and the spectral characteristics meet the preset spectral conditions. In this way, it can ensure that the laser spectrum remains stable when measuring the linewidth, avoid the influence of spectral drift or mode change on the linewidth measurement results, and thus provide more accurate data for subsequent position adjustment; therefore, the accuracy of position adjustment can be guaranteed. Attached Figure Description

[0019] Figure 1 This is a structural block diagram of a narrow-linewidth laser external cavity coupling system based on linewidth test feedback provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the mounting structure of various components in the narrow linewidth laser external cavity coupling system provided in an embodiment of the present invention; Figure 3 The image shows the mounting front view of the various components in the narrow linewidth laser external cavity coupling system provided in the embodiment of the present invention. Figure 4 This is a flowchart illustrating the steps of a narrow-linewidth laser external cavity coupling method based on linewidth test feedback provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0020] Figure label: 1-External cavity fixture displacement stage; 2-Narrow linewidth laser external cavity; 3-Optical power meter; 4-Spectrometer; 5-Linewidth tester; 6-Coupling control module. Detailed Implementation

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0022] It should be understood that although the terms first, second, etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit, without departing from the scope of the exemplary embodiments of the invention.

[0023] It should be understood that the term "and / or" that may appear in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" that may appear in this document describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this document generally indicates that the related objects before and after it are in an "or" relationship.

[0024] Example: See Figure 1 As shown in the example, the narrow-linewidth laser external cavity coupling system based on linewidth test feedback provided in this embodiment may include, but is not limited to: an external cavity fixture displacement stage 1, a narrow-linewidth laser external cavity 2, a laser measurement module, and a coupling control module 6; wherein, the external cavity fixture displacement stage 1 serves as the mounting carrier for the narrow-linewidth laser external cavity and provides the position adjustment function for the narrow-linewidth laser external cavity 2; the narrow-linewidth laser external cavity 2 provides a frequency selection mechanism for the laser, thereby realizing narrow-linewidth output; at the same time, the laser measurement module measures laser parameters such as optical power and linewidth to provide a data basis for the position adjustment of the narrow-linewidth laser external cavity; and the coupling control module 6 controls the external cavity fixture displacement stage 1 to adjust the position of the external cavity based on the laser parameters provided by the laser measurement module, thereby determining the optimal coupling position of the external cavity when the linewidth reaches the preset target, so as to realize external cavity coupling.

[0025] Optionally, the detailed working process of each of the aforementioned components is disclosed below: In this embodiment, a narrow-linewidth laser external cavity 2 is provided on the external cavity fixture displacement stage 1, and the external cavity fixture displacement stage 1 is used to adjust the position of the narrow-linewidth laser external cavity 2; the narrow-linewidth laser external cavity 2 is used to receive the laser emitted by the narrow-linewidth laser and narrow the linewidth of the received laser to output a narrow-linewidth laser; in this embodiment, the narrow-linewidth laser external cavity refers to an external cavity introduced into the laser resonant cavity, which achieves frequency selection by introducing an external cavity diode laser into the laser resonant cavity, thereby producing a very narrow linewidth and having high frequency stability.

[0026] After narrowing the linewidth of the narrow-linewidth laser, a laser measurement module can be used to measure the first laser parameter. That is, the laser measurement module is used to measure the first laser parameter of the narrow-linewidth laser and feed the first laser parameter back to the coupling control module. In this embodiment, the first laser parameter may include, but is not limited to, the optical power of the narrow-linewidth laser. Thus, this embodiment measures the optical power of the laser (that is, the output power of the laser) in real time to adjust the driving parameters of the laser in real time, thereby ensuring that the output power of the laser meets the preset conditions when the linewidth is tested.

[0027] Specifically, the optical power feedback mechanism is as follows: the coupling control module 6 is used to adjust the driving parameters of the narrow linewidth laser according to the first laser parameters to update the first laser parameters of the narrow linewidth laser, and send a parameter test command to the laser measurement module when the first laser parameters meet the preset conditions.

[0028] In specific applications, preset conditions may include, but are not limited to, the following: the optical power reaches its maximum power, that is, the output power of the laser reaches its maximum power. In this way, through real-time feedback of optical power, the laser can be guaranteed to be in the best working state when measuring linewidth, thereby improving the accuracy of linewidth measurement and providing reliable data for subsequent external cavity position adjustment.

[0029] Optionally, the aforementioned driving parameters may include, but are not limited to, the driving current of the laser; and for example, when the optical power is less than the maximum power, the driving current is increased by a preset step size, and then the optical power of the narrow linewidth laser output from the external cavity of the narrow linewidth laser is remeasured, and the optical power is compared with the maximum power again; in this way, the optical power is continuously fed back until the optical power is measured to be equal to the maximum power, then the linewidth can be measured, that is, a parameter test command is sent to the laser measurement module.

[0030] The laser measurement module is further configured to continuously measure the second laser parameter of the narrow-linewidth laser after receiving the parameter test command, and send the second laser parameter to the coupling control module. In this embodiment, the parameter test command is essentially a linewidth test command; therefore, the second laser parameter is the laser linewidth. Simultaneously, for example, but not limited to, the laser linewidth can be continuously measured at preset intervals, such as once every 0.1 seconds, and fed back to the coupling control module. Thus, after measuring the laser linewidth, the position of the outer cavity can be adjusted based on the laser linewidth. The process is as follows: The coupling control module 6 is also used to control the external cavity fixture displacement stage 1 to adjust the position of the narrow linewidth laser external cavity 2 based on the second laser parameters until the received second laser parameters reach the preset target, thereby obtaining the optimal coupling position of the external cavity and fixing the narrow linewidth laser external cavity 2 at the optimal coupling position of the external cavity to complete the coupling of the narrow linewidth laser external cavity 2.

[0031] In this embodiment, after receiving each laser linewidth, the coupling control module 6 determines whether the laser linewidth has reached a preset target (i.e., a preset linewidth value). If the preset target has not been reached, the external cavity fixture displacement stage 1 is controlled to adjust the position of the narrow linewidth laser external cavity 2. After adjusting the position, the optical power is remeasured, and when it reaches its maximum power, the linewidth is measured again. Then, the feedback is sent back to the coupling control module 6 to re-determine the linewidth. In this way, the position of the external cavity is continuously adjusted in the aforementioned feedback manner until the laser linewidth reaches the preset target after adjustment. This position is the optimal coupling position of the external cavity. Finally, the narrow linewidth laser external cavity 2 can be fixed at the optimal coupling position of the external cavity, thereby completing the coupling of the narrow linewidth laser external cavity.

[0032] In specific implementation, the coupling control module 6 may include one or more microcontrollers, and the model can be specifically set according to actual use. This embodiment does not make specific limitations.

[0033] As described above, this invention achieves external cavity coupling by integrating optical power and laser linewidth, ensuring that the actual performance meets design specifications and that parameters are consistent. Furthermore, the entire coupling process is fully automated, requiring no human intervention and effectively avoiding the subjective influence of operators, thereby improving process stability and production efficiency. Based on this, this invention can meet the stringent requirements of next-generation optoelectronic devices for process stability, production efficiency, and parameter consistency, making it highly suitable for large-scale application and promotion.

[0034] In one possible design, this embodiment provides a further optimization scheme based on optical power: In specific applications, the first laser parameter may include, but is not limited to, the spectral characteristics of the narrow-linewidth laser. These spectral characteristics may include, for example, one or more of the center wavelength, spectral width, and spectral intensity. Thus, after measuring the spectral characteristics of the narrow-linewidth laser, this information can be fed back to the coupling control module 6. The coupling control module 6 then combines this with the optical power to determine the conditions for the laser's driving parameters. Specifically, the coupling control module 6 adjusts the driving parameters of the narrow-linewidth laser based on the optical power and spectral characteristics, and sends a parameter test command to the laser measurement module when the optical power of the narrow-linewidth laser reaches its maximum and the spectral characteristics meet preset spectral conditions.

[0035] Optionally, for example, the preset spectral conditions are: the spectral characteristics information is kept constant at the temperature, that is, the center wavelength, spectral width and / or spectral intensity remain unchanged within a preset time; at the same time, the driving current is also adjusted, and the principle will not be elaborated here.

[0036] Thus, linewidth measurement is only performed when the optical power of the narrow-linewidth laser meets the maximum power and the spectral characteristics meet the preset spectral conditions. This ensures that the laser spectrum remains stable during linewidth measurement, avoiding the influence of spectral drift or mode changes on the linewidth measurement results, thereby providing more accurate data for position adjustment; therefore, the accuracy of external cavity position adjustment can be guaranteed.

[0037] Furthermore, the detailed structure and working process of each of the aforementioned components are provided below in this embodiment: Optional, for example, the laser measurement module may include, but is not limited to: optical power meter 3, spectrometer 4, and linewidth meter 5.

[0038] Among them, the optical power meter 3 is used to measure the optical power of the narrow linewidth laser and feed the optical power back to the coupling control module 6; while the spectrometer 4 is used to perform spectral analysis on the narrow linewidth laser, obtain spectral characteristic information and feed it back to the coupling control module 6, so that the coupling control module 6 can adjust the driving parameters of the narrow linewidth laser according to the optical power and the spectral characteristic information.

[0039] Furthermore, the linewidth tester 6 is used to measure the linewidth of the narrow-linewidth laser output from the outer cavity 2 of the narrow-linewidth laser after receiving the parameter test command, and send the laser linewidth as a second laser parameter to the coupling control module; thus, after the linewidth tester 6 sends the laser linewidth to the coupling control module 6, the coupling control module 6 can adjust the position of the outer cavity 2 of the narrow-linewidth laser based on the laser linewidth.

[0040] Specifically, one of the specific structures of the external cavity fixture displacement stage 1 is disclosed below: In this embodiment, the external cavity fixture displacement stage 1 may include, but is not limited to, an external cavity fixture and a displacement mechanism; wherein, the narrow linewidth laser external cavity 2 is connected to the displacement mechanism through the external cavity fixture, and the displacement mechanism includes an X-axis displacement stage, a Y-axis displacement stage, and a Z-axis displacement stage; thus, the coupling control module can adjust the position of the narrow linewidth laser external cavity 2 by controlling the X-axis displacement stage, the Y-axis displacement stage, and the Z-axis displacement stage.

[0041] In this embodiment, for example, when the laser linewidth is smaller than the preset target, the displacement of the X-axis displacement stage, Y-axis displacement stage, and Z-axis displacement stage is increased by a fixed step size (e.g., by 0.01 cm) until the measured laser linewidth equals the preset target; conversely, if it is larger than the preset target, the displacement of the X-axis displacement stage, Y-axis displacement stage, and Z-axis displacement stage is decreased by a fixed step size until the measured laser linewidth equals the preset target.

[0042] Therefore, through the coordinated action of the X-axis, Y-axis and Z-axis displacement stages, the position of the external cavity can be precisely adjusted to achieve optimal coupling with the output beam of the laser.

[0043] Furthermore, the aforementioned external cavity fixture displacement stage 1, optical power meter 3, spectrometer 4, linewidth meter 5, and coupling control module 6 can be installed inside the coupling housing. A schematic diagram of their installation structure can be found in [reference needed]. Figure 2 and Figure 3 As shown.

[0044] Optionally, in this embodiment, the system may also include, but is not limited to, a dispensing machine and a display module.

[0045] The coupling control module is communicatively connected to the dispensing machine and is used to send a dispensing command to the dispensing machine after determining the optimal coupling position of the outer cavity. The dispensing machine, upon receiving the dispensing command, releases adhesive to the optimal coupling position of the outer cavity to fix the outer cavity of the narrow linewidth laser at the optimal coupling position. In this way, the outer cavity can be fixed.

[0046] In addition, the display module is communicatively connected to the coupling control module, which is used to visualize the first laser parameters and the second laser parameters; at the same time, it can also display the status of the coupling process (such as whether the coupling is successful) and allow users to manually adjust the coupling parameters.

[0047] Thus, the working process of this invention is as follows: The narrow-linewidth laser's external cavity is fixed to the external cavity fixture's displacement stage using a cavity clamp. Through the coordinated action of the X, Y, and Z-axis displacement stages, the position of the external cavity can be precisely adjusted to achieve optimal coupling with the laser's output beam. An optical power meter and spectrometer work synchronously with the linewidth meter to ensure maximum laser output power and stable spectral characteristics during linewidth measurement. The linewidth meter measures the coupled laser linewidth in real time and feeds the results back to the coupling control module. The microcontroller in the coupling control module adjusts the position of the external cavity fixture's displacement stage based on the feedback signal from the linewidth meter to optimize the coupling effect. When the linewidth reaches the predetermined target, an adhesive applicator applies adhesive to the coupling position to fix the external cavity. The entire coupling process can be monitored and manually adjusted via a user interface, ensuring the accuracy and reliability of the coupling process.

[0048] Therefore, compared with the prior art, the present invention has at least the following beneficial effects: (1) The system is highly efficient and adopts an automatic feedback mechanism. No operator intervention is required, which can realize fully automatic production and effectively improve production efficiency.

[0049] (2) The system has high consistency in the production of devices. The optimal coupling position of the narrow linewidth external cavity takes into account optical power, spectral characteristics and linewidth, and is controlled by program algorithm, avoiding the subjective influence of operators and improving the consistency and stability of the production of narrow linewidth lasers.

[0050] like Figure 4 As shown, the second aspect of this embodiment provides a method for coupling the external cavity of a narrow linewidth laser based on linewidth test feedback. The method is executed based on the coupling control module in the narrow linewidth laser external cavity coupling system based on linewidth test feedback described in the first aspect of the embodiment, and the execution process of the method is as shown in steps S1 to S3 below.

[0051] S1. Obtain the first laser parameters of the narrow linewidth laser output from the external cavity of the narrow linewidth laser, wherein the first laser parameters include the optical power of the narrow linewidth laser, and the external cavity of the narrow linewidth laser is disposed on the external cavity fixture displacement stage.

[0052] S2. Based on the first laser parameters, adjust the driving parameters of the narrow linewidth laser to update the first laser parameters of the narrow linewidth laser. When the first laser parameters meet the preset conditions, send a parameter test command to the laser measurement module so that the laser measurement module continuously measures the second laser parameters of the narrow linewidth laser after receiving the parameter test command, and sends the second laser parameters to the coupling control module. The second laser parameter is the laser linewidth, and the preset conditions include the optical power reaching the maximum power.

[0053] S3. Based on the second laser parameters, control the external cavity fixture displacement stage to adjust the position of the narrow linewidth laser external cavity until the received second laser parameters reach the preset target, obtain the optimal coupling position of the external cavity, and fix the narrow linewidth laser external cavity at the optimal coupling position of the external cavity to complete the coupling of the narrow linewidth laser external cavity.

[0054] The working process, working details and technical effects of the method provided in this embodiment can be found in the first aspect of the embodiment, and will not be repeated here.

[0055] like Figure 5 As shown, the third aspect of this embodiment provides a narrow-linewidth laser external cavity coupling device based on linewidth test feedback. Taking the device as an electronic device as an example, it includes: a memory, a processor, and a transceiver connected in sequence. The memory is used to store a computer program, the transceiver is used to send and receive messages, and the processor is used to read the computer program and execute the narrow-linewidth laser external cavity coupling method based on linewidth test feedback as described in the second aspect of the embodiment.

[0056] For specific examples, the memory may include, but is not limited to, random access memory (RAM), read-only memory (ROM), flash memory, first-in-first-out (FIFO) memory, and / or first-in-last-out (FILO) memory, etc.; specifically, the processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor may be implemented using at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor. The main processor, also known as the CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state.

[0057] In some embodiments, the processor may integrate a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the screen. For example, the processor may not be limited to microprocessors of the STM32F105 series, reduced instruction set computer (RISC) microprocessors, x86 architecture processors, or processors with integrated neural network processing units (NPUs). The transceiver may be, but is not limited to, a Wi-Fi transceiver, a Bluetooth transceiver, a General Packet Radio Service (GPRS) transceiver, a ZigBee (a low-power LAN protocol based on the IEEE 802.15.4 standard) transceiver, a 3G transceiver, a 4G transceiver, and / or a 5G transceiver. Furthermore, the device may also include, but is not limited to, a power module, a display screen, and other necessary components.

[0058] The working process, working details and technical effects of the electronic device provided in this embodiment can be found in the second aspect of the embodiment, and will not be repeated here.

[0059] The fourth aspect of this embodiment provides a storage medium that stores instructions containing the narrow-linewidth laser external cavity coupling method based on linewidth test feedback as described in the second aspect of the embodiment. That is, the storage medium stores instructions that, when executed on a computer, perform the narrow-linewidth laser external cavity coupling method based on linewidth test feedback as described in the second aspect of the embodiment.

[0060] The storage medium refers to a carrier for storing data, which may include, but is not limited to, floppy disks, optical disks, hard disks, flash memory, USB flash drives, and / or memory sticks. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.

[0061] The working process, working details and technical effects of the storage medium provided in this embodiment can be found in the second aspect of the embodiment, and will not be repeated here.

[0062] The fifth aspect of this embodiment provides a computer program product containing instructions that, when executed on a computer, cause the computer to perform the narrow-linewidth laser external cavity coupling method based on linewidth test feedback as described in the second aspect of this embodiment, wherein the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.

[0063] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A narrow-linewidth laser external cavity coupling system based on linewidth test feedback, characterized in that, include: An external cavity fixture displacement stage is provided, wherein a narrow linewidth laser external cavity is provided on the external cavity fixture displacement stage, and the external cavity fixture displacement stage is used to adjust the position of the narrow linewidth laser external cavity; The external cavity of the narrow linewidth laser is used to receive the laser emitted by the narrow linewidth laser and to narrow the linewidth of the received laser to output a narrow linewidth laser. A laser measurement module is used to measure the first laser parameters of the narrow linewidth laser and feed the first laser parameters back to the coupling control module, wherein the first laser parameters include the optical power of the narrow linewidth laser; The coupling control module is used to adjust the driving parameters of the narrow linewidth laser according to the first laser parameters to update the first laser parameters of the narrow linewidth laser, and send a parameter test command to the laser measurement module when the first laser parameters meet the preset conditions, wherein the preset conditions include the optical power reaching the maximum power. The laser measurement module is also used to continuously measure the second laser parameter of the narrow linewidth laser after receiving the parameter test command, and send the second laser parameter to the coupling control module, wherein the second laser parameter is the laser linewidth; The coupling control module is also used to control the external cavity fixture displacement stage to adjust the position of the narrow linewidth laser external cavity based on the second laser parameters until the received second laser parameters reach the preset target, thereby obtaining the optimal coupling position of the external cavity and fixing the narrow linewidth laser external cavity at the optimal coupling position of the external cavity to complete the coupling of the narrow linewidth laser external cavity.

2. The narrow-linewidth laser external cavity coupling system based on linewidth test feedback according to claim 1, characterized in that, The first laser parameter also includes: spectral characteristic information of the narrow linewidth laser, wherein the coupling control module is used to send the parameter test command to the laser measurement module when the optical power of the narrow linewidth laser reaches the maximum power and the spectral characteristic information meets the preset spectral conditions.

3. The narrow-linewidth laser external cavity coupling system based on linewidth test feedback according to claim 2, characterized in that, The laser measurement module includes: an optical power meter and a spectrometer; An optical power meter is used to measure the optical power of the narrow linewidth laser and feed the optical power back to the coupling control module; A spectrometer is used to perform spectral analysis on the narrow linewidth laser, obtain spectral characteristic information, and feed it back to the coupling control module so that the coupling control module can adjust the driving parameters of the narrow linewidth laser according to the optical power and the spectral characteristic information.

4. The narrow-linewidth laser external cavity coupling system based on linewidth test feedback according to claim 1, characterized in that, The laser measurement module further includes a linewidth tester, which is used to measure the laser linewidth of the narrow linewidth laser output from the external cavity of the narrow linewidth laser after receiving the parameter test command, and send the laser linewidth as a second laser parameter to the coupling control module.

5. The narrow-linewidth laser external cavity coupling system based on linewidth test feedback according to claim 1, characterized in that, The external cavity clamp displacement stage includes: an external cavity clamp and a displacement mechanism; The narrow linewidth laser outer cavity is connected to the displacement mechanism via the outer cavity clamp, and the displacement mechanism includes an X-axis displacement stage, a Y-axis displacement stage, and a Z-axis displacement stage.

6. The narrow-linewidth laser external cavity coupling system based on linewidth test feedback according to claim 1, characterized in that, Also includes: A dispensing machine, wherein the coupling control module is communicatively connected to the dispensing machine and is used to send a dispensing command to the dispensing machine after determining the optimal coupling position of the external cavity; A dispensing machine is used to release adhesive to the optimal coupling position of the outer cavity after receiving the dispensing instruction, so as to fix the outer cavity of the narrow linewidth laser at the optimal coupling position of the outer cavity.

7. The narrow-linewidth laser external cavity coupling system based on linewidth test feedback according to claim 1, characterized in that, Also includes: The display module is communicatively connected to the coupling control module and is used to visualize the first laser parameters and the second laser parameters.

8. A method for external cavity coupling of a narrow-linewidth laser based on linewidth test feedback, characterized in that, The method is executed by the coupling control module in the narrow-linewidth laser external cavity coupling system based on linewidth test feedback as described in any one of claims 1 to 7, wherein the method includes: The first laser parameters of the narrow linewidth laser output from the external cavity of the narrow linewidth laser are obtained, wherein the first laser parameters include the optical power of the narrow linewidth laser, and the external cavity of the narrow linewidth laser is disposed on the external cavity fixture displacement stage. Based on the first laser parameters, the driving parameters of the narrow linewidth laser are adjusted to update the first laser parameters of the narrow linewidth laser. When the first laser parameters meet the preset conditions, a parameter test command is sent to the laser measurement module so that the laser measurement module continuously measures the second laser parameters of the narrow linewidth laser after receiving the parameter test command, and sends the second laser parameters to the coupling control module. The second laser parameter is the laser linewidth, and the preset conditions include the optical power reaching the maximum power. Based on the second laser parameters, the external cavity fixture displacement stage is controlled to adjust the position of the narrow linewidth laser external cavity until the received second laser parameters reach the preset target, thus obtaining the optimal coupling position of the external cavity. The narrow linewidth laser external cavity is then fixed at the optimal coupling position to complete the coupling of the narrow linewidth laser external cavity.

9. An electronic device, characterized in that, include: A memory, a processor, and a transceiver are sequentially connected in communication, wherein the memory is used to store computer programs, the transceiver is used to send and receive messages, and the processor is used to read the computer programs and execute the narrow linewidth laser external cavity coupling method based on linewidth test feedback as described in claim 8.

10. A computer program product containing instructions, characterized in that, When the instructions are executed on the computer, the computer performs the narrow-linewidth laser external cavity coupling method based on linewidth test feedback as described in claim 8.

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