Dual-wavelength laser, laser detection system and detection method thereof

Abstract

The invention relates to a dual-wavelength laser, a laser detection system and a detection method thereof. The dual-wavelength laser comprises a pumping source assembly, a resonant cavity assembly and a debugging assembly. The pumping source assembly is used for generating pumping light and pumping the pumping light into the resonant cavity assembly; the resonant cavity assembly is used for receiving the pump light and generating two laser beams with different wavelengths based on the pump light; the debugging assembly is used for receiving and debugging the two laser beams with different wavelengths. Dual-wavelength laser is generated through single equipment, and the complexity of beam combination of two lasers is avoided, so that high compactness and a simplified structure are realized; through unique laser crystal design and resonant cavity optimization, dual-wavelength laser output is achieved, and meanwhile the performance, efficiency and application flexibility of a laser system are improved. According to the laser detection system and the detection method, the polarization state of the dual-wavelength laser can be accurately measured, the limitation of a traditional polarization detection method is overcome, and the characteristics of the laser can be more comprehensively evaluated.

Description

Technical Field

[0001] The present application relates to laser technology, and in particular to a dual-wavelength laser, a laser detection system and a detection method thereof. Background Art

[0002] In today's laser technology, laser diode (LD)-pumped solid-state lasers are widely used in a variety of fields, including military, processing, medical, and scientific research, due to their numerous advantages, including small size, high efficiency, simple structure, and long service life. Dual-wavelength lasers, a key research direction in solid-state lasers, are attracting attention due to their potential applications in difference-frequency generation of coherent terahertz waves, optical communications, pump-probe experiments, biomedicine, and optical heating.

[0003] Currently, common methods for generating dual-wavelength lasers include stimulated emission of radiation using a single laser crystal, stimulated emission of radiation using multiple laser crystals, and generating multiple wavelengths using nonlinear optical crystals. While the single-laser crystal method offers simple structure and ease of operation, gain competition is inevitable due to the small separation between the two wavelengths. The multiple-laser crystal method, on the other hand, can result in a bulky, costly, and difficult to debug system. On the other hand, while generating multiple wavelengths using nonlinear optical crystals offers excellent frequency conversion efficiency, it places relatively high demands on the nonlinear crystals.

[0004] Furthermore, in the laser field, polarization performance is a key optical metric that distinguishes it from natural light. Polarized light, including linearly polarized light, circularly polarized light, and elliptically polarized light, undergoes regular changes in the direction and magnitude of its light vector during propagation. Unsatisfactory polarization performance not only reduces system efficiency but can also damage optical components. Therefore, accurate detection of the laser's polarization state is crucial when designing and optimizing laser systems. However, traditional polarization detection methods are often difficult to meet or adapt to the detection requirements of dual-wavelength beams. Summary of the Invention

[0005] Based on the above technical problems, this application aims to provide a dual-wavelength laser, a laser detection system and a detection method thereof to solve the limitations of dual-wavelength laser generation and the challenges of polarization detection in the existing technology, and aims to provide a more efficient, compact and easy-to-debug solution while ensuring accurate detection of the polarization state to meet the complex needs of modern laser applications.

[0006] In a first aspect, the present application provides a dual-wavelength laser, comprising a pump source component, a resonant cavity component, and a debugging component;

[0007] The pump source assembly is used to generate pump light and pump the pump light into the resonant cavity assembly; the pump source assembly includes a pump power supply, a pump diode, a transmission fiber, and a coupling mirror assembly coaxially arranged in sequence, wherein the pump power supply is connected to the pump diode, the pump diode is connected to the transmission fiber, and the transmission fiber is connected to the coupling mirror assembly;

[0008] The resonant cavity assembly is used to receive the pump light and generate two laser beams of different wavelengths based on the pump light; the resonant cavity assembly includes a total reflective mirror, a laser crystal, a dichroic mirror, a beam terminator, a pinhole aperture, and an output mirror that are coaxially arranged in sequence;

[0009] The debugging component is used for receiving and debugging the two laser beams with different wavelengths; the debugging component comprises a first reflecting mirror, a focusing lens and a second reflecting mirror which are placed in sequence.

[0010] In some embodiments of the present application, the coupling lens assembly is a five-piece achromatic laser coupling lens assembly.

[0011] In some embodiments of the present application, the pump diode generates pump light after receiving a preset constant voltage current and preset temperature control provided by the pump power supply, and injects the pump light into the coupling mirror assembly through the transmission optical fiber for focusing coupling.

[0012] In some embodiments of the present application, the coupling mirror group pumps the focused coupled pump light into the surface of the laser crystal via the total reflection mirror to generate dual-wavelength stimulated emission oscillation light, and the dual-wavelength stimulated emission oscillation light is emitted into the output mirror via the pinhole aperture to output two beams of laser light with different wavelengths.

[0013] In some embodiments of the present application, the first reflector receives two laser beams with different wavelengths output by the output mirror and redirects the two laser beams with different wavelengths to the focusing lens. The focusing lens focuses the two laser beams with different wavelengths and then injects them into the second reflector to obtain the first wavelength laser and the second wavelength laser.

[0014] A second aspect of the present application provides a laser detection system, the laser detection system comprising the dual-wavelength laser according to claim 5, and the laser detection system further comprising a laser detection device.

[0015] In some embodiments of the present application, the laser detection device includes a first detection component and a second detection component, wherein the first detection component is used to detect the intensity of the first wavelength laser and the second wavelength laser, and the second detection component is used to detect the wavelength of the first wavelength laser and the second wavelength laser.

[0016] In some embodiments of the present application, the first detection assembly includes a quarter-wave plate, a polarization analyzer, and a power meter coaxially arranged in sequence;

[0017] The quarter-wave plate receives the first-wavelength laser light and the second-wavelength laser light, and transmits the first-wavelength laser light and the second-wavelength laser light to the power meter via the analyzer.

[0018] In some embodiments of the present application, the second detection component includes a fiber optic probe, a spectrometer, and a host computer, the fiber optic probe is connected to the spectrometer, and the spectrometer is communicatively connected to the host computer;

[0019] The optical fiber probe absorbs scattered light from a preset area of ​​the power meter and transmits the scattered light to the spectrometer;

[0020] The spectrometer converts the spectral information of the scattered light into a digital signal, and transmits the digital signal to the host computer.

[0021] A third aspect of the present application provides a detection method of the laser detection system described in an embodiment, the detection method comprising:

[0022] Temporarily remove the quarter-wave plate, rotate the analyzer to a horizontal direction, and check the first wavelength laser and the second wavelength laser;

[0023] According to the detected intensity changes of the first wavelength laser light and / or the second wavelength laser light, it is determined whether the first wavelength laser light and the second wavelength laser light are polarized lights.

[0024] In some embodiments of the present application, determining whether the first wavelength laser light and the second wavelength laser light are polarized light based on the detected intensity change of the first wavelength laser light and / or the second wavelength laser light includes:

[0025] If the intensity of the first wavelength laser and / or the second wavelength laser changes, and based on whether there is extinction in the intensity change, it is determined whether the first wavelength laser and the second wavelength laser are polarized lights.

[0026] In some embodiments of the present application, determining whether the first wavelength laser and the second wavelength laser are polarized light based on whether there is an extinction phenomenon in the intensity change includes:

[0027] If there are two extinction phenomena in the intensity variation, then both the first wavelength laser and the second wavelength laser are linearly polarized lights;

[0028] If there is an extinction phenomenon in the intensity change, and the extinction phenomenon is generated by one of the first wavelength laser and the second wavelength laser, then the laser beam is linearly polarized light;

[0029] Check whether the wavelength of another beam of the first wavelength laser light and the second wavelength laser light excluding the beam changes, and determine the polarization type of the other beam according to the checking result.

[0030] In some embodiments of the present application, the step of inspecting whether the wavelength of another beam of the first wavelength laser light and the second wavelength laser light excluding the first wavelength laser light has changed, and determining the polarization type of the other beam based on the inspection result includes:

[0031] checking whether the wavelength of another beam of the first wavelength laser light and the second wavelength laser light excluding the first wavelength laser light changes, and if the wavelength changes, the other beam is elliptically polarized light;

[0032] If the wavelength does not change, the quarter wave plate is returned to its original position and the analyzer is rotated back to the horizontal direction, and the polarization type of the other beam is determined according to whether extinction occurs in the other beam.

[0033] In some embodiments of the present application, determining the polarization type of the other beam according to whether extinction occurs in the other beam includes:

[0034] If the extinction phenomenon occurs in the other beam, the other beam is circularly polarized light; if the extinction phenomenon does not occur in the other beam, the other beam is natural light.

[0035] In some embodiments of the present application, determining whether the first wavelength laser and the second wavelength laser are polarized light based on whether there is an extinction phenomenon in the intensity change includes:

[0036] If there is no extinction phenomenon in the intensity change, and both the first wavelength laser and the second wavelength laser show intensity changes, then both the first wavelength laser and the second wavelength laser are circularly polarized lights;

[0037] If there is no extinction phenomenon in the intensity change, and only one of the first wavelength laser light and the second wavelength laser light undergoes intensity change, then the first wavelength laser light is elliptically polarized light;

[0038] For the other beam of the first wavelength laser and the second wavelength laser except the beam, the quarter wave plate is returned to its position and the analyzer is rotated back to the horizontal direction, and the polarization type of the other beam is determined based on whether extinction occurs in the other beam.

[0039] In some embodiments of the present application, determining the polarization type of the other beam according to whether extinction occurs in the other beam includes:

[0040] If the extinction phenomenon occurs in the other beam, the other beam is circularly polarized light; if the extinction phenomenon does not occur in the other beam, the other beam is natural light.

[0041] In some embodiments of the present application, the determining whether the first wavelength laser light and the second wavelength laser light are polarized light based on the detected intensity change of the first wavelength laser light and / or the second wavelength laser light further includes:

[0042] If it is checked that neither the first wavelength laser nor the second wavelength laser undergoes intensity change, the quarter wave plate is returned to its original position and the analyzer is rotated back to the horizontal direction, and the polarization type of the first wavelength laser and the second wavelength laser is determined based on whether extinction occurs.

[0043] In a fourth aspect, the present application provides an electronic device including a memory and a processor, wherein the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the processor executes the detection method of the laser detection system described in each embodiment.

[0044] In a fifth aspect, the present application provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the detection method of the laser detection system described in each embodiment is implemented.

[0045] The technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0046] The dual-wavelength laser in each embodiment of the present application generates dual-wavelength lasers through a single device, avoiding the complexity of using two lasers to combine beams, thereby achieving high compactness and a simplified structure; through unique laser crystal design and resonant cavity optimization, dual-wavelength laser output is achieved while also improving the performance, efficiency and application flexibility of the laser system, demonstrating significant progress in the field of advanced laser technology.

[0047] The laser detection system in each embodiment of the present application can accurately measure the polarization state of a dual-wavelength laser, overcoming the limitations of traditional polarization detection methods. By integrating the dual functions of intensity detection and wavelength detection, it can more comprehensively evaluate the characteristics of the laser and provide reliable data support for high-precision laser applications.

[0048] The detection method in each embodiment of the present application provides an efficient and accurate polarization detection method. Through detailed detection steps, including the inspection of intensity changes and extinction phenomena, it can accurately determine the polarization of the laser and which polarization type it belongs to; through detailed analysis of the intensity changes and wavelength changes under different polarization states, it can cope with more complex polarization conditions, thereby providing strong adaptability and flexibility for the detection of laser polarization states.

[0049] Overall, these technical effects jointly enhance the application potential of dual-wavelength lasers in multiple fields (such as military, medical, scientific research, etc.), especially in high-end applications that require precise control of the laser polarization state, providing high-efficiency, high-precision and high-reliability solutions.

[0050] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0052] Figure 1 is a schematic structural diagram of a dual-wavelength laser in an exemplary embodiment of the present application;

[0053] Figure 2 is a structural schematic diagram of a coupling mirror assembly in an exemplary embodiment of the present application;

[0054] Figure 3 This is a schematic diagram of the steps of a detection method of a laser detection system in an exemplary embodiment of the present application;

[0055] Figure 4 This is a flow chart of a detection method of a laser detection system in an exemplary embodiment of the present application;

[0056] Figure 5 It is a structural diagram of an electronic device provided by an exemplary embodiment of the present application.

[0057] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. DETAILED DESCRIPTION

[0058] In modern laser technology, laser diode (LD)-pumped solid-state lasers are widely used in a variety of fields, including military, industrial processing, medical treatment, and scientific research, due to their advantages such as miniaturization, high efficiency, simple structure, and long service life. Dual-wavelength lasers, in particular, as a key research area in solid-state lasers, have attracted considerable attention due to their enormous potential in applications such as coherent terahertz wave generation, optical communications, pump-probe, biomedicine, and photothermal processing.

[0059] Unlike combining two laser beams to produce two wavelengths, dual-wavelength lasers can generate both wavelengths directly from a single laser, offering the advantage of high compactness. Currently, there are three main methods for generating dual-wavelength lasers: stimulated emission of radiation from a single laser crystal, stimulated emission of radiation from multiple laser crystals, and multi-wavelength generation using nonlinear optical crystals. The single-crystal method, while simple and easy to operate, is limited by gain competition; the multi-crystal method faces the challenges of bulk, high cost, and complex debugging; and the nonlinear optical crystal method, while highly efficient, has stringent requirements for the crystals.

[0060] Furthermore, polarization is a critical optical property in laser technology. Different from natural light, it encompasses linear, circular, and elliptical polarization. Poor polarization characteristics can reduce system efficiency and potentially damage optical components. Therefore, accurate polarization state detection is crucial when designing and optimizing laser systems. However, traditional polarization detection methods often struggle to meet the detection requirements of dual-wavelength lasers.

[0061] Therefore, in some embodiments of the present application, a dual-wavelength laser, a laser detection system, and a detection method thereof are provided. This application is further described in detail below with reference to the accompanying drawings and several embodiments. It should be understood that the embodiments described herein are intended only to illustrate the relevant invention and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only portions relevant to the relevant invention are shown in the accompanying drawings.

[0062] Example 1

[0063] This embodiment provides a dual-wavelength laser. Figure 1 The dual-wavelength laser includes a pump source component, a resonant cavity component and a debugging component; the pump source component is used to generate pump light and pump the pump light into the resonant cavity component; Figure 1 As shown, the pump source assembly includes a coaxially arranged pump power supply 1, pump diode 2, transmission fiber 3, and coupling mirror assembly 4. The pump power supply 1 is connected to the pump diode 2, which is connected to the transmission fiber 3, which is connected to the coupling mirror assembly 4. Specifically, the pump diode 2 generates pump light after receiving a preset constant voltage current and preset temperature control from the pump power supply 1. The pump light is then injected into the coupling mirror assembly 4 through the transmission fiber 3 for focused coupling.

[0064] In a specific implementation, the coupling lens group is a five-piece achromatic laser coupling lens group, such as Figure 2 As shown, the coupling lens group belongs to a five-piece achromatic laser coupling lens group, including 5 lenses A, B, C, D and E. Figure 2 The diagram illustrates the specific placement of the five lenses. Lenses A and B are doublets that, together with lens C, form the beam expander of the front group, while lenses D and E form the focusing section of the rear group. The entire coupling system, a five-lens achromatic laser coupling lens group, has a conjugate distance of 45mm, enabling achromatic processing of 800-812nm pump light.

[0065] The five-piece achromatic laser coupling lens assembly can reduce the influence of chromatic aberration caused by different wavelengths, thereby ensuring the optical quality and system performance of the dual-wavelength laser, while the pump source assembly achieves efficient pump light coupling and focusing, thereby improving pump efficiency and laser output effect.

[0066] In one specific implementation, a resonant cavity assembly is used to receive pump light and generate two laser beams of different wavelengths based on the pump light. The resonant cavity assembly includes a coaxially arranged total reflection mirror 5, a laser crystal 6, a dichroic mirror 7, a beam terminator 8, a pinhole diaphragm 9, and an output mirror 10. The coupling mirror assembly 4 pumps the focused and coupled pump light onto the surface of the laser crystal 6 via the total reflection mirror 5, generating dual-wavelength stimulated emission of radiation. The dual-wavelength stimulated emission of radiation is then incident on the output mirror 10 via the pinhole diaphragm 9 to output two laser beams of different wavelengths. Excess pump light is deflected by the dichroic mirror 7 and incident on the beam terminator 8.

[0067] Specifically, if Figure 1 As shown, laser crystal 6 absorbs pump light energy, causing particles to transition to an upward energy level, resulting in population inversion. Due to its unique energy-level structure, dual-wavelength stimulated emission oscillations are generated. Such crystals include YLF (yttrium lithium fluoride), YVO4 (yttrium vanadate), Lu2O3 (lutetium oxide), and Y2O3 (yttrium oxide) doped with various rare earth elements. Due to gain competition between different transition lines within the laser crystal, this can result in only a single-wavelength output. In practice, dual-wavelength output is achieved by controlling the loss of different transition lines to meet threshold conditions. Specific control methods include adjusting the reflectivity and tilt angle of the output mirror, modifying the losses within the resonant cavity, and designing a special cavity geometry. Furthermore, the beam waist radius of the light spot within the cavity field influences the aperture selection of the pinhole diaphragm 9. The pinhole diaphragm is used to shape the oscillating beam, suppressing higher-order modes to achieve high-quality output light. Generally, the aperture of the pinhole diaphragm 9 is selected to be several times the diameter of the light spot to ensure sufficient light passes through the aperture. However, factors such as the diffraction effect of light, transmittance, and the required beam shape must also be considered when selecting the pinhole aperture.

[0068] The debugging component is used to receive and debug two laser beams with different wavelengths; the debugging component includes a first reflector 11, a focusing lens 12 and a second reflector 13 placed in sequence. Figure 1 As shown, the first reflector 11 receives two laser beams of different wavelengths output by the output mirror 10, and redirects the two laser beams of different wavelengths to the focusing lens 12. The focusing lens focuses the two laser beams of different wavelengths and then injects them into the second reflector 13 to obtain a first wavelength laser and a second wavelength laser, that is, a dual-wavelength light beam. Here, the two reflectors are used to change the propagation direction of the laser beam to achieve optical path folding, while the focusing lens 12 is used to reduce the divergence angle of the laser beam and increase the energy density of the laser at the target by focusing the beam. It can be seen that the debugging component plays an important role in the dual-wavelength laser. It not only provides flexible optical path design possibilities, but also ensures the high quality and applicability of the laser output through the focusing and adjustment of the light beam, and also facilitates subsequent testing.

[0069] The dual-wavelength laser described in this application generates dual-wavelength laser light, eliminating the complex operation of combining two laser beams and making the system more compact and simple. Through unique laser crystal design and cavity optimization, it not only achieves dual-wavelength laser output but also improves system performance, efficiency, and application flexibility, achieving significant progress in advanced laser technology.

[0070] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

[0071] Example 2

[0072] This embodiment provides a laser detection system. The laser detection system includes the dual-wavelength laser of embodiment 1. The laser detection system also includes a laser detection device.

[0073] Furthermore, the laser detection device includes a first detection component and a second detection component, wherein the first detection component is used to detect the intensity of the first wavelength laser and the second wavelength laser, and the second detection component is used to detect the wavelength of the first wavelength laser and the second wavelength laser.

[0074] Refer again Figure 1, the first detection component includes a quarter-wave plate 14, an analyzer 15 and a power meter 16 coaxially arranged in sequence; the quarter-wave plate 14 receives the first wavelength laser and the second wavelength laser, and injects the first wavelength laser and the second wavelength laser into the power meter 16 through the analyzer 15. The second detection component includes a fiber optic probe 17, a spectrometer 18 and a host computer 19. The fiber optic probe 17 is connected to the spectrometer 18, and the spectrometer 18 is communicatively connected to the host computer 19. It can be understood that the fiber optic probe absorbs the scattered light in the preset area of ​​the power meter and transmits the scattered light to the spectrometer; the spectrometer converts the spectral information of the scattered light into a digital signal, and transmits the digital signal to the host computer, through which the wavelength change of the light beam can be observed and checked in real time. The preset area refers to the specific area in the power meter that captures the scattered light.

[0075] It should be noted that the quarter-wave plate 14 is a phase retarder that can cause the incident light to produce a phase delay of an odd multiple of π / 2, which is used to change the polarization state of the light. It is relatively sensitive to wavelength. For dual-wavelength lasers, a wave plate of the corresponding band or an achromatic composite wave plate can be selected; the polarizer 15 can be used to detect the polarization state of the incident light based on the properties of crystal birefringence, and the operation is achieved by rotating along the direction of the incident light.

[0076] The laser detection system can accurately measure the polarization state of dual-wavelength lasers, overcoming the limitations of traditional polarization detection methods. By integrating the dual functions of intensity detection and wavelength detection, it can more comprehensively evaluate the characteristics of the laser and provide reliable data support for high-precision laser applications.

[0077] Example 3

[0078] This embodiment provides a detection method of the laser detection system described in Example 2, such as Figure 3 As shown, the detection method includes: S1, temporarily removing the quarter-wave plate, rotating the polarizer to the horizontal direction, and checking the first wavelength laser and the second wavelength laser; S2, judging whether the first wavelength laser and the second wavelength laser are polarized light based on the intensity change of the checked first wavelength laser and / or the second wavelength laser.

[0079] The main function of a quarter-wave plate is to change the polarization state of the incident light. When light of different wavelengths (such as light a and light b) passes through the quarter-wave plate, they are split into two types of light (light o and light e) due to the birefringence effect. These two types of light vibrate along the fast and slow axes in the wave plate, resulting in phase delay. Through this phase delay, the original polarization state (such as linear polarization) can be converted into another polarization state (such as circular polarization). This conversion is crucial for subsequent polarization light detection because it allows different types of polarized light to be distinguished by changing the polarization state.

[0080] An analyzer is used to detect light with a specific polarization direction. By rotating the analyzer, it can selectively allow light with a specific polarization direction to pass through while blocking light with other directions. This allows different types of polarized light to be distinguished by changing the analyzer's orientation, allowing the polarization of laser light to be verified.

[0081] In a specific implementation, refer to Figure 4 If the intensity of the first and / or second wavelength laser beams changes, and whether extinction occurs during the intensity change, determine whether the first and second wavelength laser beams are polarized. If there are two extinction events during the intensity change, both the first and second wavelength laser beams are linearly polarized. If there is one extinction event during the intensity change, and that extinction event is caused by one of the first and second wavelength laser beams, then that laser beam is linearly polarized. Check whether the wavelength of the other beam, excluding the other beam, changes, and determine the polarization type of the other beam based on the inspection result.

[0082] The presence or absence of the above extinction phenomenon is different in the results observed by the power meter and the host computer. The power meter can read the value 0, and two extinction phenomena can read two zero points. First remove the quarter wave plate ( Figure 4 1 / 4 wave plate in the image), rotate the analyzer, observe the power meter, if there is a change in light intensity and there is no zero point in the light intensity, observe the wavelength change in the host computer, and if a certain wavelength is extinct at the weakest point of light intensity, then this wavelength corresponds to linearly polarized light.

[0083] In a specific implementation method of the present invention, whether the wavelength of another beam of the first wavelength laser and the second wavelength laser excluding the beam has changed, and determining the polarization type of the other beam based on the inspection result, includes: checking whether the wavelength of another beam of the first wavelength laser and the second wavelength laser excluding the beam has changed, if the wavelength has changed, the other beam is elliptically polarized light; if the wavelength has not changed, returning the quarter-wave plate to its original position and rotating the analyzer back to the horizontal direction, and determining the polarization type of the other beam based on whether extinction occurs in the other beam, if extinction occurs in the other beam, the other beam is circularly polarized light, and if extinction does not occur in the other beam, the other beam is natural light.

[0084] The above-mentioned repositioning of the quarter-wave plate and re-rotation of the polarizer is because the type of polarized light cannot be clearly determined in the previous step. Therefore, re-placing the quarter-wave plate and rotating the polarizer can change the polarization state of certain light, so that they show different characteristics when re-detected, making them easier to distinguish.

[0085] In some other embodiments, such as Figure 4As shown in the figure, if there is no extinction during the intensity change, and both the first and second wavelength lasers experience intensity changes, then both the first and second wavelength lasers are circularly polarized light. If there is no extinction during the intensity change, and only one of the first and second wavelength lasers experiences intensity changes, then that beam is elliptically polarized light. For the other beam of the first and second wavelength lasers, excluding that beam, return the quarter-wave plate to its original position and rotate the analyzer horizontally along the direction of the incident light. The polarization type of the other beam is determined based on whether extinction occurs. If extinction occurs, then the other beam is circularly polarized light. If extinction does not occur, then the other beam is natural light.

[0086] If the measured intensity of both the first and second wavelength lasers remains unchanged, the quarter-wave plate is returned to its original position and the analyzer is rotated horizontally along the direction of the incident light. The polarization types of the first and second wavelength lasers are determined based on whether extinction occurs. If there is still no change in intensity, both wavelengths are natural light. If extinction occurs at both wavelengths, both are circularly polarized. If extinction occurs at only one wavelength, that wavelength corresponds to circularly polarized light, while the other corresponds to natural light.

[0087] It can be understood that by removing and then repositioning the quarter-wave plate and adjusting the orientation of the analyzer, light of different polarization states can be effectively distinguished and detected. The key to this detection method lies in using the quarter-wave plate to change the polarization state of light and selectively detecting light of a specific polarization state by adjusting the orientation of the analyzer, thereby achieving accurate identification and classification of polarized light.

[0088] The detection method can detect ten results: all natural light, all linearly polarized light, all circularly polarized light, all elliptically polarized light, natural light + linearly polarized light, natural light + circularly polarized light, natural light + elliptically polarized light, linearly polarized light + circularly polarized light, linearly polarized light + elliptically polarized light, and circularly polarized light + elliptically polarized light. The detection method is used to verify that both wavelengths of the light beam are natural light or fully polarized light. Partially polarized light is not considered in this method. Therefore, by carefully analyzing the intensity and wavelength changes under different polarization states, it is possible to cope with more complex polarization conditions, thereby providing strong adaptability and flexibility for the detection of laser polarization states.

[0089] Example 4

[0090] Please refer to the following Figure 5 , which is a schematic diagram of an electronic device provided by some embodiments of the present application. Figure 5As shown, the electronic device 2 includes: a processor 200, a memory 201, a bus 202 and a communication interface 203, and the processor 200, the communication interface 203 and the memory 201 are connected via the bus 202; the memory 201 stores a computer program that can be run on the processor 200, and when the processor 200 runs the computer program, it executes the detection method of the laser detection system described in this application.

[0091] The memory 201 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage. The system network element communicates with at least one other network element via at least one communication interface 203 (which may be wired or wireless), and may utilize the Internet, a wide area network, a local area network, a metropolitan area network, or the like.

[0092] The bus 202 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory 201 is used to store programs, and the processor 200 executes the programs after receiving execution instructions. The image recognition method based on cross-layer feature mining disclosed in any of the aforementioned embodiments of the present application can be applied to the processor 200 or implemented by the processor 200.

[0093] The processor 200 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the processor 200 or by software instructions. The above processor 200 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of this application can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory 201 , and the processor 200 reads the information in the memory 201 and completes the detection method of the laser detection system in combination with its hardware.

[0094] Example 5

[0095] This embodiment provides a computer-readable storage medium corresponding to the detection method of the aforementioned laser detection system, on which a computer program is stored. When the computer program is executed by a processor, it will execute the detection method of the laser detection system provided by any of the aforementioned embodiments. In addition, examples of the computer-readable storage medium may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory, or other optical or magnetic storage media, which are not listed here one by one.

[0096] In addition, an embodiment of the present application further provides a computer program product, including a computer program, which, when executed by a processor, implements the detection method of the laser detection system described in any one of the aforementioned embodiments.

[0097] Those skilled in the art will appreciate that the various component embodiments of the present application can be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that in practice, a microprocessor or digital signal processor (DSP) can be used to implement some or all of the functions of some or all of the components of the apparatus for creating a virtual machine according to an embodiment of the present application.

[0098] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A dual-wavelength laser, characterized in that: The dual-wavelength laser includes a pump source component, a resonant cavity component and a debugging component; The pump source assembly is used to generate pump light and pump the pump light into the resonant cavity assembly; the pump source assembly includes a pump power supply, a pump diode, a transmission fiber, and a coupling mirror assembly coaxially arranged in sequence, wherein the pump power supply is connected to the pump diode, the pump diode is connected to the transmission fiber, and the transmission fiber is connected to the coupling mirror assembly; The resonant cavity assembly is used to receive the pump light and generate two laser beams of different wavelengths based on the pump light; the resonant cavity assembly includes a total reflective mirror, a laser crystal, a dichroic mirror, a beam terminator, a pinhole aperture, and an output mirror that are coaxially arranged in sequence; The debugging component is used for receiving and debugging the two laser beams with different wavelengths; the debugging component comprises a first reflecting mirror, a focusing lens and a second reflecting mirror which are placed in sequence.

2. The dual-wavelength laser according to claim 1, characterized in that: The coupling lens group is a five-piece achromatic laser coupling lens group.

3. The dual-wavelength laser according to claim 1, characterized in that: The pump diode generates pump light after receiving the preset constant voltage current and preset temperature control provided by the pump power supply, and injects the pump light into the coupling mirror group through the transmission optical fiber to perform focusing coupling.

4. The dual-wavelength laser according to claim 3, characterized in that: The coupling mirror group pumps the focused coupled pump light into the surface of the laser crystal via the total reflection mirror to generate dual-wavelength stimulated emission oscillation light, which is then incident on the output mirror via the pinhole aperture to output two laser beams with different wavelengths.

5. The dual-wavelength laser according to claim 4, characterized in that: The first reflector receives two laser beams with different wavelengths output by the output mirror and redirects the two laser beams with different wavelengths to the focusing lens. The focusing lens focuses the two laser beams with different wavelengths and then injects them into the second reflector to obtain the first wavelength laser and the second wavelength laser.

6. A laser detection system, characterized in that: The laser detection system includes the dual-wavelength laser according to claim 5, and further includes a laser detection device.

7. The laser detection system according to claim 6, characterized in that: The laser detection device includes a first detection component and a second detection component, wherein the first detection component is used to detect the intensity of the first wavelength laser and the second wavelength laser, and the second detection component is used to detect the wavelength of the first wavelength laser and the second wavelength laser.

8. The laser detection system according to claim 7, characterized in that: The first detection assembly includes a quarter wave plate, a polarization analyzer and a power meter coaxially arranged in sequence; The quarter-wave plate receives the first-wavelength laser light and the second-wavelength laser light, and transmits the first-wavelength laser light and the second-wavelength laser light to the power meter via the analyzer.

9. The laser detection system according to claim 8, characterized in that: The second detection component includes a fiber optic probe, a spectrometer and a host computer, the fiber optic probe is connected to the spectrometer, and the spectrometer is communicatively connected to the host computer; The optical fiber probe absorbs scattered light from a preset area of ​​the power meter and transmits the scattered light to the spectrometer; The spectrometer converts the spectral information of the scattered light into a digital signal, and transmits the digital signal to the host computer.

10. A detection method of the laser detection system according to claim 9, characterized in that: The detection method comprises: Temporarily remove the quarter-wave plate, rotate the analyzer to a horizontal direction, and check the first wavelength laser and the second wavelength laser; According to the detected intensity changes of the first wavelength laser light and / or the second wavelength laser light, it is determined whether the first wavelength laser light and the second wavelength laser light are polarized lights.

11. The detection method of the laser detection system according to claim 10, characterized in that: The determining whether the first wavelength laser light and the second wavelength laser light are polarized light according to the detected intensity change of the first wavelength laser light and / or the second wavelength laser light includes: If the intensity of the first wavelength laser and / or the second wavelength laser changes, and based on whether there is extinction in the intensity change, it is determined whether the first wavelength laser and the second wavelength laser are polarized lights.

12. The detection method of the laser detection system according to claim 11, characterized in that: The determining whether the first wavelength laser and the second wavelength laser are polarized lights according to whether the intensity change has an extinction phenomenon includes: If there are two extinction phenomena in the intensity change, then the first wavelength laser and the second wavelength laser are both linearly polarized lights; If there is an extinction phenomenon in the intensity change, and the extinction phenomenon is generated by one of the first wavelength laser and the second wavelength laser, then the laser beam is linearly polarized light; Check whether the wavelength of another beam of the first wavelength laser light and the second wavelength laser light excluding the beam changes, and determine the polarization type of the other beam according to the checking result.

13. The detection method of the laser detection system according to claim 12, characterized in that: The checking whether the wavelength of another beam of the first wavelength laser light and the second wavelength laser light excluding the beam changes, and determining the polarization type of the other beam according to the checking result, includes: checking whether the wavelength of another beam of the first wavelength laser light and the second wavelength laser light excluding the first wavelength laser light changes, and if the wavelength changes, the other beam is elliptically polarized light; If the wavelength does not change, the quarter wave plate is returned to its original position and the analyzer is rotated back to the horizontal direction, and the polarization type of the other beam is determined according to whether extinction occurs in the other beam.

14. The detection method of the laser detection system according to claim 13, characterized in that: The determining the polarization type of the other beam according to whether the extinction phenomenon occurs in the other beam includes: If the extinction phenomenon occurs in the other beam, the other beam is circularly polarized light; if the extinction phenomenon does not occur in the other beam, the other beam is natural light.

15. The detection method of the laser detection system according to claim 11, characterized in that: The determining whether the first wavelength laser and the second wavelength laser are polarized lights according to whether the intensity change has an extinction phenomenon includes: If there is no extinction phenomenon in the intensity change, and both the first wavelength laser and the second wavelength laser show intensity changes, then both the first wavelength laser and the second wavelength laser are circularly polarized lights; If there is no extinction phenomenon in the intensity change, and only one of the first wavelength laser light and the second wavelength laser light undergoes intensity change, then the first wavelength laser light is elliptically polarized light; For the other beam of the first wavelength laser and the second wavelength laser except the beam, the quarter wave plate is returned to its position and the analyzer is rotated back to the horizontal direction, and the polarization type of the other beam is determined based on whether extinction occurs in the other beam.

16. The detection method of the laser detection system according to claim 15, characterized in that: The determining the polarization type of the other beam according to whether the extinction phenomenon occurs in the other beam includes: If the extinction phenomenon occurs in the other beam, the other beam is circularly polarized light; if the extinction phenomenon does not occur in the other beam, the other beam is natural light.

17. The detection method of the laser detection system according to claim 10, characterized in that: The determining whether the first wavelength laser light and the second wavelength laser light are polarized light based on the detected intensity change of the first wavelength laser light and / or the second wavelength laser light further includes: If it is checked that neither the first wavelength laser nor the second wavelength laser undergoes intensity change, the quarter wave plate is returned to its original position and the analyzer is rotated back to the horizontal direction, and the polarization type of the first wavelength laser and the second wavelength laser is determined based on whether extinction occurs.

18. An electronic device comprising a memory and a processor, characterized in that: The memory stores computer-readable instructions, which, when executed by the processor, enable the processor to execute the detection method of the laser detection system according to any one of claims 10 to 17.

19. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the detection method of the laser detection system according to any one of claims 10 to 17 is implemented.

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