A data-driven based narrow-linewidth tunable dual-wavelength laser output system

Abstract

This invention relates to the field of solid-state laser technology, specifically providing a data-driven narrow-linewidth tunable dual-wavelength laser output system. The system includes a pump source, a resonant cavity, a data acquisition unit, and a data receiver and driver. The resonant cavity contains a single gain medium, two F-P etalons, and an F-P angle adjuster. The tilt angle of the two F-P etalons is adjusted by the F-P angle adjuster to perform longitudinal mode selection and wavelength tuning of the output laser. The data receiver and driver incorporate a neural network screening model. This model learns the mapping relationship between intracavity parameters and output laser optical parameters, utilizing the dual etalons for collaborative mode selection. The data-driven approach of the neural network screening model achieves simultaneous dual-wavelength locking and linewidth prediction. This invention significantly simplifies system complexity and functionally achieves dual-wavelength, narrow-linewidth, high-stability, repeatable, and automated laser output control, which is impossible with traditional architectures.

Description

Technical Field

[0001] This invention belongs to the field of solid-state laser technology, and particularly relates to a data-driven narrow-linewidth tunable dual-wavelength laser output system. Background Technology

[0002] Narrow-linewidth tunable lasers (NLLs) are widely used in important fields such as high-precision spectroscopy, differential absorption lidar (DIAL), precision metrology, medical diagnostics, lidar detection, and quantum information due to their long coherence length, high frequency stability, and high spectral resolution. Particularly in the deep red visible light region (690–730 nm), this band is highly sensitive to changes in vegetation physiological state and canopy structure, making it crucial for vegetation remote sensing monitoring. Single-wavelength detection has inherent limitations in vegetation classification, density inversion, and physiological parameter estimation; recent research trends have increasingly shifted towards multi-wavelength synergistic detection and laser spectral resolution enhancement.

[0003] Currently, most common narrow-linewidth visible lasers are obtained through nonlinear frequency conversion (frequency doubling, sum-frequency conversion, third-frequency conversion, etc.). Relying on nonlinear frequency conversion processes such as frequency doubling and sum-frequency conversion inevitably requires the introduction of one or more nonlinear crystals, leading to complex system structure, increased cost, and limited overall efficiency. Existing visible or deep-red lasers mostly rely on traditional manual adjustment methods to achieve wavelength control and linewidth compression. Their tuning process mainly relies on manually adjusting the position or angle of intracavity components, lacking intelligent control methods based on real-time data analysis, resulting in low adjustment efficiency, poor repeatability, and insufficient output stability. Simultaneously, existing multi-wavelength laser systems often require multiple gain media, complex coupling structures, or nonlinear frequency conversion to obtain different wavelength outputs, resulting in large system size, complex structure, and difficulty in stabilizing the optical path. Furthermore, it is difficult to simultaneously achieve stable single-longitudinal-mode output of two wavelengths in a simple straight-cavity structure.

[0004] In recent years, the maturity of blue laser diode technology has driven research progress on visible light gain media such as Pr:YLF, which can directly emit red, orange, and deep red light, becoming a feasible solution for obtaining visible light without frequency conversion. However, how to achieve the coexistence of dual wavelengths (698nm and 720nm) in a single resonant cavity while maintaining a single longitudinal mode and achieving narrow linewidth tuning remains an important unsolved problem. Therefore, there is an urgent need for a method for achieving narrow linewidth laser output with dual wavelengths through a single resonant cavity. Summary of the Invention

[0005] In view of this, the present invention aims to provide a data-driven narrow-linewidth tunable dual-wavelength laser output system, which can achieve stable, narrow-linewidth dual-wavelength laser output by setting only one gain medium in the same resonant cavity and combining it with a data-driven parameter optimization method.

[0006] To achieve the above objectives, the technical solution created by this invention is implemented as follows:

[0007] This invention provides a data-driven, narrow-linewidth tunable dual-wavelength laser output system, comprising:

[0008] Pump source;

[0009] The resonant cavity contains a single gain medium, at least two FP etalons, and an FP angle adjuster. The tilt angle of the at least two FP etalons is adjusted by the FP angle adjuster to perform longitudinal mode selection and wavelength tuning of the output laser of the resonant cavity.

[0010] The data acquisition unit is used to monitor the optical parameters of the output laser in real time.

[0011] The data receiver and driver are connected to the data acquisition unit and the FP angle adjuster, respectively. The data receiver and driver have a built-in neural network screening model. The neural network screening model is used to learn the mapping relationship between the intracavity parameters and the output laser optical parameters, predict the optimal pump power value of the pump source and the optimal tilt angle of at least two FP etalons under the preset dual-wavelength narrow linewidth output state, and control the pump source and FP angle adjuster based on the predicted optimal pump power value and the optimal tilt angle of at least two FP etalons.

[0012] Preferably, the pump source is a 444nm blue laser.

[0013] Preferably, the resonant cavity further includes an input mirror and an output mirror respectively disposed at both ends of the cavity. The pump light provided by the pump source enters the resonant cavity through the input mirror and passes through the gain medium and at least two FP etalons in sequence. The pump light is excited and radiated through the gain medium and oscillates between the input mirror and the output mirror, and is finally output by the output mirror.

[0014] Preferably, the FP etalon is a parallel Fabry-Perot etalon.

[0015] Preferably, the data acquisition unit includes: a beam splitter, a spectrometer, a FP interferometer, and an oscilloscope;

[0016] The beam splitter is located in the optical path at the rear end of the output mirror and is used to split the output laser into a first beam and a second beam. The first beam is incident on a spectrometer, which is used to monitor the wavelength and power value of the output laser. The second beam is incident on a FP interferometer, the output of which is connected to an oscilloscope. The FP interferometer is used to convert the longitudinal mode structure of the output laser into an interference signal, and the oscilloscope is used to display the interference signal to obtain the mode purity index, linewidth value, and frequency stability index of the output laser.

[0017] Preferably, the laser gain medium is a praseodymium-doped lithium yttrium fluoride crystal.

[0018] Preferably, at least two FP etalons include two first FP etalons and second FP etalons with different thicknesses, the thickness of the first FP etalon being less than the thickness of the second FP etalon, and the first FP etalons and second FP etalons are cascaded to collaboratively achieve longitudinal mode selection and wavelength tuning.

[0019] Preferably, the FP angle adjuster is a piezoelectric rotary platform or a stepper motor angle platform, and its minimum angle adjustment step is better than 0.01°.

[0020] Preferably, the output laser includes a 698nm component and a 720nm component, and both the 698nm component and the 720nm component maintain single-mode characteristics.

[0021] Preferably, the inputs to the neural network screening model include: the real-time wavelength, power value, mode purity index, linewidth value, frequency stability index of the output laser, and the tilt angles of at least two FP etalons; the outputs of the neural network screening model include: the optimal pump power value of the pump source and the optimal tilt angles of at least two FP etalons under the preset dual-wavelength narrow linewidth output state.

[0022] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0023] This invention is the first to introduce a data-driven method into the output control process of a single-gain medium straight-cavity dual-wavelength laser. By learning the intrinsic mapping relationship between the multidimensional structural parameters of the laser and the output state through a neural network model, it realizes the prediction and optimization control of the laser output state, breaking through the technical path of relying on repeated manual trial and error in the past and greatly improving the adjustment efficiency.

[0024] This invention abandons the multi-gain medium coupling or nonlinear frequency conversion scheme commonly used in existing multi-wavelength lasers. It achieves stable output of 698nm and 720nm dual-wavelength lasers using only a single gain medium in a linear resonant cavity. The dual-wavelength lasers achieve coaxial oscillation and output within the same resonant cavity, avoiding the problems of complex optical path coupling and alignment difficulties in multi-cavity structures. It eliminates the need to introduce complex nonlinear optical devices or additional resonant cavity structures, enabling miniaturization and integration of the system while ensuring output performance. This significantly improves the engineering adaptability and application expansion capabilities of the laser, significantly enhances the system's compactness and optical path stability, fundamentally simplifies the system structure, and reduces the difficulty of implementation.

[0025] This invention achieves synergistic optimization of dual-wavelength laser output performance by incorporating pump parameters, resonant cavity length, and intracavity mode selection parameters into a unified data-driven control system. This enables the simultaneous acquisition of narrow linewidth and tunable characteristics, overcoming the technical challenge of multiple parameters being mutually constrained and difficult to balance in the prior art. It achieves stable simultaneous output of two wavelengths, 698nm and 720nm, within the same resonant cavity, while maintaining single-mode characteristics for both wavelengths. This meets the needs of high-precision spectroscopy, differential absorption lidar, and other fields for multi-wavelength synergistic detection.

[0026] This invention constructs a closed-loop control system of "real-time monitoring-model inference-parameter adjustment," in which a spectrometer monitors the dual-wavelength power in real time, an FP interferometer and an oscilloscope monitor the longitudinal model characteristics in real time, dynamic feedback data is continuously input into the neural network model, and the model outputs optimized parameters in real time to drive the actuator to adjust. This closed-loop mechanism not only avoids the problem of repeated manual trial and error, but also effectively suppresses the impact of environmental disturbances (such as temperature drift, vibration, and device aging) on ​​output performance, ensuring the long-term stable operation of the laser. Attached Figure Description

[0027] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of a data-driven narrow-linewidth tunable dual-wavelength laser output system according to an embodiment of the present invention;

[0029] Figure 2 This is a control principle diagram based on a neural network screening model provided according to an embodiment of the present invention.

[0030] The reference numerals in the figures include:

[0031] Pump source 1, coupling mirror group 2, input mirror 3, gain medium 4, FP etalon 5, output mirror 6, beam splitter 7, FP angle adjuster 8, spectrometer 9, FP interferometer 10, oscilloscope 11, data receiver and driver 12. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and do not constitute a limitation thereof. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the invention. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the invention are not shown or described in the specification. This is to avoid obscuring the core parts of the invention with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; the relevant operations can be fully understood based on the description in the specification and general technical knowledge in the art.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined to form various implementations. Furthermore, the order of the steps or actions in the method description can be changed or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the clear description of a particular embodiment and do not imply a mandatory order, unless otherwise stated that a particular order must be followed.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] Please see Figure 1 In one embodiment of the present invention, a data-driven narrow-linewidth tunable dual-wavelength laser output system is provided, comprising:

[0038] Pump source 1;

[0039] The resonant cavity contains a single gain medium 4, at least two FP etalons 5, and an FP angle adjuster 8. The tilt angle of the at least two FP etalons 5 is adjusted by the FP angle adjuster 8 to perform longitudinal mode selection and wavelength tuning of the output laser of the resonant cavity.

[0040] The data acquisition unit is used to monitor the optical parameters of the output laser in real time.

[0041] The data receiver and driver 12 is connected to the data acquisition unit and the FP angle adjuster 8, respectively. The data receiver and driver 12 has a built-in neural network screening model. The neural network screening model is used to learn the mapping relationship between the intracavity parameters and the output laser optical parameters, predict and obtain the optimal pump power value of the pump source 1 and the optimal tilt angle of at least two FP etalons 5 under the preset dual-wavelength narrow linewidth output state, and control the pump source 1 and the FP angle adjuster 8 based on the predicted optimal pump power value and the optimal tilt angle of at least two FP etalons 5.

[0042] Pump source 1 is a 444nm blue laser with built-in power supply and control circuitry, which adjusts the output power. Pump source 1 is located outside the laser resonant cavity, with its output direction aligned with coupling mirror group 2, which is positioned in the output light path of pump source 1. Coupler mirror group 2 includes multiple lenses for focusing and shaping to optimize the mode matching efficiency of the pump light provided by pump source 1 in the gain medium 4.

[0043] After being focused and shaped by the coupling mirror group 2, the pump light is directed to the input mirror 3 at a suitable angle and position, allowing it to enter the resonant cavity efficiently. The resonant cavity includes, in sequence along the propagation direction of the pump light: the input mirror 3, the gain medium 4, two FP etalons 5, and the output mirror 6. The input mirror 3 is a partial reflector at one end of the resonant cavity, located at the pump light incident end of the resonant cavity, between the coupling mirror group 2 and the gain medium 4. The input mirror 3 allows the pump light to enter the resonant cavity and forms partial reflection.

[0044] Gain medium 4 is a praseodymium-doped yttrium fluoride (Pr:YLF) crystal, the core element for stimulated emission. It is positioned after input mirror 3 and before FP etalon 5, in the central region of the resonant cavity. The praseodymium-doped yttrium fluoride crystal has a strong absorption band near 444 nm, matching the wavelength of pump source 1. The emission spectrum of the praseodymium-doped yttrium fluoride crystal covers the deep red-visible region, especially exhibiting high emission cross-sections at 698 nm and 720 nm, enabling simultaneous oscillation of two wavelengths. As the pump light passes through gain medium 4, it absorbs pump light energy, achieving population inversion and providing gain for both 698 nm and 720 nm wavelengths, allowing them to oscillate simultaneously within the same resonant cavity.

[0045] The two FP etalons 5 are designated as the first FP etalon and the second FP etalon, respectively. These are two Fabry-Perot etalons of different thicknesses, positioned between the gain medium 4 and the output mirror 6, and used for longitudinal mode selection and wavelength tuning. In a preferred embodiment, the first FP etalon has a thickness of 0.1 mm and a larger free spectral range (FSR), used for coarse longitudinal mode selection, initially identifying a single longitudinal mode from the gain spectrum. The second FP etalon has a thickness of 1 mm and a smaller FSR, used for fine mode selection, further narrowing the linewidth to ensure single-mode operation. The first and second FP etalons are cascaded to achieve higher longitudinal mode selectivity.

[0046] In addition, the first FP etalon and the second FP etalon are respectively connected to the FP angle adjuster 8. The FP angle adjuster 8 is a high-precision piezoelectric rotary platform or stepper motor angle platform, and its angle adjustment minimum step is better than 0.01°. The tilt angle of the first FP etalon and the second FP etalon can be adjusted through the FP angle adjuster 8 to achieve fine tuning of the laser wavelength or longitudinal mode.

[0047] Output mirror 6 is the output portion of the resonant cavity's reflector, positioned after the FP etalon group 5 at the output end of the resonant cavity. The pump light is excited and radiated through the gain medium 4, oscillating between the input mirror 3 and the output mirror 6, and finally output by the output mirror 6. The output laser emitted from the output mirror 6 includes a 698nm component and a 720nm component, both of which maintain single-mode longitudinal characteristics.

[0048] Traditional lasers rely on manual adjustment for wavelength control and linewidth compression, primarily adjusting the position or angle of intracavity components. This lack of intelligent control based on real-time data analysis results in low efficiency, poor repeatability, and unstable output. Furthermore, traditional adjustment schemes require different gain media for the 698nm and 720nm components; otherwise, the adjustment difficulty increases dramatically, making rapid wavelength control and linewidth compression nearly impossible. However, multi-gain media designs lead to large system size and complex structure, making it difficult to achieve stable single-mode output of both wavelengths simultaneously in a simple straight-cavity structure. To address these issues, this invention proposes a data-driven approach. A data acquisition unit and a data receiver and driver 12 are designed at the rear end of the output mirror 6. Two FP etalons 5 are used for collaborative mode selection, and a neural network is used to achieve simultaneous dual-wavelength locking and linewidth prediction. This significantly simplifies system complexity and achieves dual-wavelength, narrow-linewidth, highly stable, repeatable, and automated laser output control—features unattainable by traditional architectures.

[0049] Specifically, a beam splitter 7 is installed on the optical path at the rear end of the output mirror 6. The beam splitter 7 splits the output laser into a first beam and a second beam, which correspond to two different optical paths. A spectrometer 9 is installed on one optical path, and an FP interferometer 10 and an oscilloscope 11 are installed on the other optical path. The first beam is incident on the spectrometer 9, which monitors the wavelength and power value of the output laser in real time, that is, measures the actual center wavelengths of 698nm and 720nm in real time to determine whether drift has occurred. By integrating the spectral intensity, the power values ​​of the two wavelengths are obtained, and the real-time wavelength and power value of the output laser are transmitted to the data receiver and driver 12 as feedback. The second beam is incident on the FP interferometer 10, and the output end of the FP interferometer 10 is connected to the oscilloscope 11. The FP interferometer 10 converts the longitudinal mode structure of the output laser into an interference signal, which is displayed on the oscilloscope 11 to obtain the mode purity index, linewidth value, and frequency stability index of the output laser. Similarly, the mode purity index, linewidth value, and frequency stability index are transmitted to the data receiver and driver 12 as dynamic feedback data.

[0050] The data receiver and driver 12 is the core of the feedback control system for the laser output system. It utilizes a neural network and closed-loop control to automatically adjust the pump power of pump source 1 and the tilt angles of the two FP etalons 5. Specifically, the data receiver and driver 12 incorporates a neural network screening model. The number of neurons in the hidden layer of this model is set to (20, 20, 20), the maximum number of iterations during training is set to 1000, and the learning rate is 0.01. This neural network screening model is used to learn the mapping relationship between intracavity parameters and output laser optical parameters. For example... Figure 2 As shown, the data receiver and driver 12 includes a data receiver, a control unit, and a reverse neural network. The reverse neural network is a pre-trained neural network screening model. The input layer of the neural network screening model is pre-calibrated with the simulation results obtained using two FP etalons 5 (i.e., the transmission spectrum characteristics obtained based on theoretical calculations) and the influence of pump light output power on linewidth (the relationship between calibration power and linewidth can be pre-implemented). During wavelength and bandwidth control in the laser output system, the inputs to the neural network screening model include: the real-time wavelength, power value, mode purity index, linewidth value, and frequency stability index of the output laser, as well as the real-time tilt angles of the two FP etalons 5. Based on the above multi-dimensional parameters, the neural network screening model predicts the optimal pump power value of pump source 1 and the optimal tilt angles of the two FP etalons 5 under the preset dual-wavelength (698nm and 720nm) narrow linewidth output state. Based on the obtained optimal pump power value of pump source 1 and optimal tilt angles of the two FP etalons 5 under the preset dual-wavelength (698nm and 720nm) narrow linewidth output state, it controls pump source 1 and FP angle adjuster 8 respectively, so that the pump power value of pump source 1 is equal to the optimal pump power value, and the tilt angles of the two FP etalons 5 are the optimal tilt angles. This realizes the closed-loop optimization of real-time monitoring, intelligent decision-making, and precise control of the laser output state, ensuring the long-term stable operation of the dual-wavelength narrow linewidth laser. This invention relates to a data-driven control-based dual-wavelength narrow-linewidth laser output system. By collecting multi-dimensional parameter data related to the output characteristics during laser operation, a mapping model between intracavity parameters and laser output state is established, enabling prediction and optimized control of the dual-wavelength laser output state. Unlike existing laser solutions that rely on manual experience for adjustment, this invention employs a linear resonant cavity dual-wavelength laser with a single gain medium. Stable oscillation output of two different wavelength lasers can be achieved within the same resonant cavity using only one gain medium, eliminating the need for multi-gain medium coupling or nonlinear frequency conversion. The system is simple in structure, highly stable, and easy to implement in engineering.

[0051] As an alternative embodiment, a volume Bragg grating, grating filter, or other intracavity frequency selection device can be used instead of the FP etalon 5 to achieve longitudinal mode control.

[0052] In summary, the above description is merely a preferred embodiment of this specification and is not intended to limit the scope of protection of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

[0053] The systems, apparatuses, modules, or units described in one or more of the above embodiments may be implemented by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer. Specifically, a computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0054] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

Claims

1. A data-driven, narrow-linewidth tunable dual-wavelength laser output system, characterized in that, include: Pump source; A resonant cavity is provided with a single gain medium, at least two FP etalons and an FP angle adjuster. The tilt angle of the at least two FP etalons is adjusted by the FP angle adjuster to perform longitudinal mode selection and wavelength tuning of the output laser of the resonant cavity. The data acquisition unit is used to monitor the optical parameters of the output laser in real time. The data receiver and driver are connected to the data acquisition unit and the FP angle adjuster, respectively. The data receiver and driver have a built-in neural network screening model. The neural network screening model is used to learn the mapping relationship between the intracavity parameters and the output laser optical parameters, predict the optimal pump power value of the pump source and the optimal tilt angle of the at least two FP etalons under the preset dual-wavelength narrow linewidth output state, and control the pump source and the FP angle adjuster based on the predicted optimal pump power value and the optimal tilt angle of the at least two FP etalons.

2. The data-driven narrow-linewidth tunable dual-wavelength laser output system according to claim 1, characterized in that, The pump source is a 444nm blue laser.

3. The data-driven narrow-linewidth tunable dual-wavelength laser output system according to claim 1, characterized in that, The resonant cavity also includes an input mirror and an output mirror respectively disposed at both ends of the cavity. The pump light provided by the pump source enters the resonant cavity through the input mirror and passes through the gain medium and the at least two FP etalons in sequence. The pump light is excited and radiated by the gain medium and oscillates between the input mirror and the output mirror, and is finally output by the output mirror.

4. The data-driven narrow-linewidth tunable dual-wavelength laser output system according to claim 1, characterized in that, The FP etalon is a parallel Fabry-Perot etalon.

5. The data-driven narrow-linewidth tunable dual-wavelength laser output system according to claim 3, characterized in that, The data acquisition unit includes: a beam splitter, a spectrometer, a FP interferometer, and an oscilloscope; The beam splitter is located in the optical path at the rear end of the output mirror and is used to split the output laser into a first beam and a second beam. The first beam is incident on a spectrometer, which is used to monitor the wavelength and power value of the output laser. The second beam is incident on a FP interferometer, the output of which is connected to an oscilloscope. The FP interferometer is used to convert the longitudinal mode structure of the output laser into an interference signal, and the oscilloscope is used to display the interference signal to obtain the mode purity index, linewidth value, and frequency stability index of the output laser.

6. The data-driven narrow-linewidth tunable dual-wavelength laser output system according to claim 1, characterized in that, The laser gain medium is a praseodymium-doped lithium yttrium fluoride crystal.

7. The data-driven narrow-linewidth tunable dual-wavelength laser output system according to claim 1, characterized in that, The at least two FP etalons include two first FP etalons and second FP etalons with different thicknesses. The thickness of the first FP etalon is less than that of the second FP etalon. The first FP etalon and the second FP etalon are cascaded to collaboratively achieve longitudinal mode selection and wavelength tuning.

8. The data-driven narrow-linewidth tunable dual-wavelength laser output system according to claim 1, characterized in that, The FP angle adjuster is a piezoelectric rotary platform or a stepper motor angle platform, and its minimum angle adjustment step is better than 0.01°.

9. The data-driven narrow-linewidth tunable dual-wavelength laser output system according to claim 1, characterized in that, The output laser includes a 698nm component and a 720nm component, and both the 698nm and 720nm components maintain single-mode characteristics.

10. The data-driven narrow-linewidth tunable dual-wavelength laser output system according to claim 5, characterized in that, The inputs to the neural network screening model include: the real-time wavelength, power value, mode purity index, linewidth value, and frequency stability index of the output laser, as well as the tilt angles of the at least two FP etalons; the outputs of the neural network screening model include: the optimal pump power value of the pump source and the optimal tilt angles of the at least two FP etalons under the preset dual-wavelength narrow linewidth output state.

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