Multi-wavelength frequency spacing tunable hyper-spectral laser device and spectrum regulation and control method

Abstract

The invention relates to the technical field of laser, and provides a multi-wavelength frequency spacing tunable hyper-spectral laser device and a spectrum regulation and control method. The multi-wavelength frequency spacing tunable hyper-spectral laser device comprises a laser module corresponding to a first light transmission end face of a diamond crystal so as to generate Raman laser; the Raman frequency shift regulation and control module comprises a pair of anvil cells, and the pair of anvil cells act on the two stress applying surfaces of the diamond crystal so as to apply gradient stress to the diamond crystal; and the spectral analysis module corresponds to the second light transmission end of the diamond crystal so as to obtain at least one of the frequency spacing and the spectral coverage range of the Raman laser. According to the multi-wavelength hyper-spectral laser device with the tunable frequency spacing, the frequency spacing and the spectrum coverage range of Raman laser can be flexibly adjusted; the frequency spacing and the spectrum coverage range of Raman laser can be regulated and controlled, and required multi-wavelength and frequency spacing super-continuum spectrum laser can be output.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and provides a multi-wavelength frequency-spacing tunable hyperspectral laser device and a spectral regulation method. Background Art

[0002] With the development of technology, due to its advantages such as high Raman gain, large Raman frequency shift, and wide light transmission range, diamond crystal has become an important Raman gain medium for obtaining high-power, high-beam-quality, and new-wavelength lasers. However, currently, the fixed Raman frequency shift of diamond crystal is 1332.5 cm -1 , which only limits the output of specific multi-wavelength lasers, such as 532 nm, 573 nm, 620.3 nm, 676.1 nm, 743 nm, and 824.7 nm. This results in its inability to output multi-wavelength supercontinuum lasers with tunable frequency spacing and a wide coverage range. Especially in the application of the mid-infrared and far-infrared bands, current technologies mainly rely on the self-phase modulation effect of optical fibers, but these technologies usually can only achieve spectral coverage within 2 microns. Therefore, there is an urgent need for a new technical solution that can adjust the frequency spacing and expand the spectral coverage range, so as to provide a wider range of new-wavelength, multi-wavelength, and supercontinuum spectral laser outputs for diamond Raman lasers.

[0003] In view of this background, existing technologies are difficult to meet the diverse needs in the fields of industrial laser processing, eye-safe lasers, and multi-wavelength lasers. Especially in industrial applications, supercontinuum lasers in the mid-infrared and far-infrared bands can be used for more precise and efficient processing processes, but under the current technical limitations, this application has not been fully developed. Therefore, developing a technical solution that can regulate the frequency spacing and cover the spectrum from 200 nm to the millimeter band has become an important research topic. This technology can not only enrich the application scenarios of diamond Raman lasers but also promote the further development of related technologies in multiple fields. Summary of the Invention

[0004] An embodiment of the present invention provides a multi-wavelength frequency-spacing tunable hyperspectral laser device, which provides a feasible technical solution for expanding new wavelengths, multi-wavelengths, and supercontinuum spectral laser outputs for diamond Raman lasers.

[0005] An embodiment of the present invention also provides a spectral regulation method.

[0006] A first aspect embodiment of the present invention provides a multi-wavelength frequency-spacing tunable hyperspectral laser device, comprising: A laser module, corresponding to the first light-transmitting end face of the diamond crystal, to generate Raman laser; The Raman shift regulation module includes a pair of anvil blocks, and the pair of anvil blocks act on two stress application surfaces of the diamond crystal to apply gradient stress to the diamond crystal; The spectral analysis module corresponds to the second light transmission end of the diamond crystal to obtain at least one of the frequency spacing and spectral coverage range of the Raman laser.

[0007] According to an embodiment of the present invention, the Raman shift regulation module includes a pair of stress applicators, and the pair of stress applicators are arranged corresponding to two stress application surfaces of the diamond crystal, and the anvil blocks are arranged between the stress applicators and the diamond crystal.

[0008] According to an embodiment of the present invention, the anvil block includes a connection end and an acting end which are oppositely arranged, the connection end is attached to the stress applicator, and the acting end is attached to the stress application surface of the diamond crystal.

[0009] According to an embodiment of the present invention, the contact mode between the acting end and the diamond crystal includes at least one of point contact, line contact, and surface contact.

[0010] According to an embodiment of the present invention, when the contact mode between the acting end and the diamond crystal is line contact, the line length is l When, the stress F And the stress of the stress applicator P Satisfy: ; Wherein, α Is the gradient angle of the anvil block; When the contact mode between the acting end and the diamond crystal is surface contact, the contact area is l×b When, the stress F And the stress of the stress applicator P Satisfy: ; Wherein, α Is the gradient angle of the anvil block; When the contact mode between the acting end and the diamond crystal is point contact, the stress F And the stress of the stress applicator P Satisfy: ; Wherein, r Is the radius of curvature of the acting end.

[0011] According to an embodiment of the present invention, the multi-wavelength frequency-spacing tunable hyperspectral laser device further includes a controller, which is electrically connected to the spectral analysis module, the laser module, and the stress applicator. The controller is configured to adjust the operating states of the laser module and the Raman frequency shift control module based on at least one of the frequency spacing and the spectral coverage range.

[0012] According to an embodiment of the present invention, the multi-wavelength frequency-spacing tunable hyperspectral laser device further includes a beam shaping module, which is disposed between the laser module and the diamond crystal.

[0013] According to an embodiment of the present invention, the coverage range of the frequency spacing is ω 0 to ω F , ω 0 When there is no stress, it is the intrinsic Raman frequency quantity of the diamond crystal, ω F is the stress state F under which, the Raman frequency shift quantity of the diamond crystal; ω F and stress F satisfy: ; Wherein, q represents the charge number, represents the dipole moment, H represents the Hamiltonian operator, Ψ represents the wave function of the system, E F represents the energy of the system after applying stress F , q α , q β respectively represent the coordinates of atomic nuclei α , β .

[0014] According to an embodiment of the present invention, the spectral analysis module includes one of a Fourier transform spectrometer, an interferometer, and a photoelectric converter.

[0015] An embodiment of the second aspect of the present invention provides a spectral control method for a multi-wavelength frequency-spacing tunable hyperspectral laser device as described above, including: Obtaining at least one of the actual frequency spacing and the actual spectral coverage range of the Raman laser through the spectral analysis module; Obtain a first comparison result between the actual frequency spacing and the preset frequency spacing, and / or obtain a second comparison result between the actual spectral coverage and the preset spectral coverage; Based on at least one of the first comparison result and the second comparison result, adjust the working mode of the Raman frequency shift control module.

[0016] According to the hyperspectral laser device with tunable multi-wavelength frequency spacing provided by the first aspect embodiment of the present invention, by applying a gradient stress through the Raman frequency shift control module, the intrinsic Raman vibration mode of the diamond crystal can be effectively regulated, and the Raman frequency shift amount of the diamond crystal can be controlled. This enables the device to flexibly adjust the frequency spacing and spectral coverage of the Raman laser according to different application requirements. Through the precise cooperation between the laser module and the diamond crystal, the diamond crystal can be efficiently excited to generate Raman laser. The high-power and high-stability laser beam can improve the efficiency of Raman scattering, thereby obtaining a stronger Raman laser signal, which is beneficial to improving the sensitivity and accuracy of spectral analysis. The spectral analysis module can real-time obtain parameters such as the frequency spacing and spectral coverage of the Raman laser, and feedback this information to the control system. It can regulate the frequency spacing and spectral coverage of the Raman laser, and output a supercontinuum spectral laser with multiple wavelengths and frequency spacing as required. Through the real-time monitoring and feedback mechanism, the device can timely adjust the stress applied to the anvil and the parameters of the laser module to ensure that the output of the Raman laser meets the expected requirements, improving the automation degree and stability of the device.

[0017] According to the spectral regulation method provided by the second aspect embodiment of the present invention, by real-time obtaining the actual parameters of the Raman laser and comparing them with the preset parameters, the deviation during the operation of the device can be timely detected and quickly adjusted. This closed-loop feedback control mechanism greatly improves the accuracy of spectral regulation, enabling the frequency spacing and spectral coverage of the Raman laser to more accurately meet the actual requirements, providing a strong guarantee for applications such as high-precision spectral analysis and laser processing. The regulation method can flexibly adjust the working mode of the Raman frequency shift control module according to the actual requirements, enabling the device to quickly adapt to various different application scenarios, improving the versatility and flexibility of the device. The automated parameter acquisition, comparison, and adjustment process reduce the interference of human factors and reduce human errors. The operator only needs to set the preset parameters, and the device can automatically operate and regulate, improving the work efficiency and stability, and at the same time reducing the experimental failure or product quality problems caused by improper human operation. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of the first multi-wavelength frequency-spacing tunable hyperspectral laser device provided by the present invention.

[0020] Figure 2 It is a schematic structural diagram of the second multi-wavelength frequency-spacing tunable hyperspectral laser device provided by the present invention.

[0021] Figure 3 It is a schematic structural diagram of the third multi-wavelength frequency-spacing tunable hyperspectral laser device provided by the present invention.

[0022] Figure 4 It is a schematic structural diagram of the fourth multi-wavelength frequency-spacing tunable hyperspectral laser device provided by the present invention.

[0023] Figure 5 It is a schematic flowchart of the spectral regulation method provided by the present invention.

[0024] Reference numerals: 100, laser module; 102, diamond crystal; 104, first light-passing end face; 106, anvil; 108, stress application face; 110, spectral analysis module; 112, second light-passing end face; 114, stress applicator; 116, connection end; 118, acting end; 120, controller; 122, beam shaping module. Specific embodiments

[0025] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0026] As Figures 1 to 4 shown, the first aspect embodiment of the present invention provides a multi-wavelength frequency-spacing tunable hyperspectral laser device, including: A laser module 100 corresponding to the first light-passing end face 104 of the diamond crystal 102 to generate Raman laser; A Raman frequency shift regulation module including a pair of anvils 106 that act on two stress application faces 108 of the diamond crystal 102 to apply gradient stress to the diamond crystal 102; The spectral analysis module 110 corresponds to the second light-passing end face 112 of the diamond crystal 102 to obtain at least one of the frequency spacing and spectral coverage of the Raman laser.

[0027] According to the multi-wavelength frequency-spacing tunable hyperspectral laser device provided by the embodiment of the first aspect of the present invention, by applying a gradient stress through the Raman frequency shift control module, the intrinsic Raman vibration mode of the diamond crystal 102 can be effectively controlled, and the Raman frequency shift amount of the diamond crystal 102 can be controlled. This enables the device to flexibly adjust the frequency spacing and spectral coverage of the Raman laser according to different application requirements. Through the precise cooperation between the laser module 100 and the diamond crystal 102, the diamond crystal 102 can be efficiently excited to generate Raman laser. The high-power and high-stability laser beam can improve the efficiency of Raman scattering, thereby obtaining a stronger Raman laser signal, which is beneficial to improving the sensitivity and accuracy of spectral analysis. The spectral analysis module 110 can obtain parameters such as the frequency spacing and spectral coverage of the Raman laser in real time, and feedback this information to the control system. It can control the frequency spacing and spectral coverage of the Raman laser and output a supercontinuum spectral laser with the required multi-wavelength and frequency spacing. Through the real-time monitoring and feedback mechanism, the device can timely adjust the stress applied to the anvil 106 and the parameters of the laser module 100 to ensure that the output of the Raman laser meets the expected requirements, improving the automation degree and stability of the device.

[0028] It can be understood that the supercontinuum spectral laser described in this application refers to a laser with continuous wavelengths within a preset spectral range. For example, it can output continuous lasers with wavelengths ranging from 1239.8 nm to 1266.1 nm, or continuous lasers with wavelengths ranging from 572.6 nm to 585.8 nm.

[0029] Please continue to refer to Figures 1 to 4 In the embodiment of the present invention, the laser module 100 accurately corresponds to the first light-passing end face 104 of the diamond crystal 102. In an actual device, the laser module 100 can be composed of a high-performance laser, which can generate a laser beam with a specific wavelength, power, and mode. Through precise optical path design and the cooperation of optical elements, it is ensured that the laser beam can accurately enter the first light-passing end face 104 of the diamond crystal 102, thereby exciting the diamond crystal 102 to generate Raman laser. To ensure the stability and accuracy of the laser, technical means such as temperature control and current regulation can be used to optimize the laser.

[0030] The Raman shift regulation module consists of a pair of opposed anvils 106, and the pair of opposed anvils 106 act on two stress application surfaces 108 of the diamond crystal 102 respectively. The opposed anvils 106 are made of special materials with high strength and high hardness to ensure that they can withstand and apply sufficient stress. During the working process, through precise mechanical transmission devices and control systems, the opposed anvils 106 can accurately apply gradient stress to the diamond crystal 102. The magnitude, direction and distribution of the gradient stress can be accurately adjusted according to specific experimental requirements to achieve effective regulation of the Raman shift of the diamond crystal 102.

[0031] The spectral analysis module 110 corresponds to the second light-transmitting end face 112 of the diamond crystal 102. The spectral analysis module 110 mainly consists of a high-resolution spectrometer and related data acquisition and analysis systems. When the Raman laser exits from the second light-transmitting end face 112 of the diamond crystal 102, the spectral analysis module 110 can collect the spectral information of the Raman laser in real time, and process and analyze the spectral data through advanced algorithms and software, so as to accurately obtain at least one parameter in the frequency spacing and spectral coverage of the Raman laser. In order to improve the accuracy and reliability of spectral analysis, technical means such as multiple measurements and taking the average value, background subtraction, etc. can be adopted.

[0032] It should be noted that when the diamond crystal 102 is a hexahedron, the first light-transmitting end face 104, the second light-transmitting end face 112 and the two stress application surfaces 108 are perpendicular to each other. When the diamond crystal 102 is an octahedron, the first light-transmitting end face 104, the second light-transmitting end face 112 and the two relatively parallel stress application surfaces 108 are adjacent or separated. When the diamond crystal 102 is irregular in shape, the first light-transmitting end face 104, the second light-transmitting end face 112 and the two relatively parallel stress application surfaces 108 are different end faces.

[0033] According to an embodiment of the present invention, the Raman shift regulation module includes a pair of stress applicators 114. The pair of stress applicators 114 are arranged corresponding to the two stress application surfaces 108 of the diamond crystal 102, and the opposed anvils 106 are arranged between the stress applicators 114 and the diamond crystal 102.

[0034] In an embodiment of the present invention, a pair of stress applicators 114 of the Raman shift regulation module are precisely installed according to the characteristics such as the position and shape of the stress application surface 108 of the diamond crystal 102. The stress applicator 114 generally adopts driving methods such as hydraulic, electric or pneumatic. Taking the hydraulic stress applicator 114 as an example, pressure can be transmitted through hydraulic oil, and a high-precision pressure regulating valve is used to control the magnitude of the output stress. The anvil 106 is installed between the stress applicator 114 and the diamond crystal 102, and its connection end 116 is in close contact with the stress applicator 114. During installation, it is necessary to ensure firm connection and good contact to avoid loss during stress transmission. The acting end 118 of the anvil 106 contacts the stress application surface 108 of the diamond crystal 102. During installation, according to the expected stress distribution, the relative position of the anvil 106 and the crystal should be precisely adjusted to ensure that the stress generated by the stress applicator 114 can be uniformly and accurately transmitted to the diamond crystal 102, realizing the application of gradient stress to the crystal.

[0035] The stress applicator 114 can provide a stable and precisely adjustable external force, creating good conditions for the anvil 106 to apply a specific gradient stress to the diamond crystal 102. The anvil 106 plays a key role in stress conduction and regulation in the middle. On the one hand, it ensures the efficient transmission of stress from the applicator to the crystal, and on the other hand, according to its own shape, material properties, etc., it can further optimize the distribution mode of stress on the crystal. In this way, the Raman shift of the diamond crystal 102 can be more precisely regulated, improving the regulation accuracy and stability of the multi-wavelength frequency-spacing tunable hyperspectral laser device.

[0036] According to an embodiment of the present invention, the anvil 106 includes a connection end 116 and an acting end 118 arranged oppositely. The connection end 116 is attached to the stress applicator 114, and the acting end 118 is attached to the stress application surface 108 of the diamond crystal 102.

[0037] In an embodiment of the present invention, as a key component of the Raman shift regulation module, the connection end 116 of the anvil 106 is attached to the stress applicator 114. To ensure close and stable attachment, the shape of the connection end 116 is usually customized according to the shape of the output end of the stress applicator 114. If the output end of the stress applicator 114 is planar, the connection end 116 will also be designed as a flat plane, and special adhesives may be added or mechanical fastening methods such as bolt connection and snap connection may be used on the contact surface to enhance the connection strength between the two and ensure stable stress transmission.

[0038] The acting end 118 is attached to the stress application surface 108 of the diamond crystal 102, and its shape and surface characteristics are designed according to experimental requirements and the requirement of uniform stress application. If a uniform stress distribution is desired, the acting end 118 may be designed as a plane that matches the shape of the stress application surface 108; if concentrated stress needs to be generated in a specific area of the crystal, the acting end 118 will be designed as a specific convex shape, such as spherical, columnar, etc. At the same time, to reduce damage to the crystal surface and optimize the stress transfer effect, the surface of the acting end 118 is finely polished so that its surface roughness reaches a specific standard to ensure good contact with the stress application surface 108 of the crystal.

[0039] From the perspective of stress transfer, the tight fit between the connecting end 116 and the stress applicator 114 ensures that stress can be efficiently and losslessly transferred from the stress applicator 114 to the anvil 106, avoiding problems such as stress leakage or unstable transfer caused by loose connection, and greatly improving the accuracy and stability of stress application.

[0040] The attachment method of the acting end 118 to the stress application surface 108 of the diamond crystal 102 provides strong support for precisely controlling the stress distribution in the crystal. According to different experimental purposes and crystal characteristics, by changing the shape and surface characteristics of the acting end 118, the stress distribution pattern on the crystal can be flexibly adjusted to achieve precise control of the Raman frequency shift of the diamond crystal 102.

[0041] According to an embodiment of the present invention, the contact method between the acting end 118 and the diamond crystal 102 includes at least one of point contact, line contact, and surface contact.

[0042] In an embodiment of the present invention, the diversity of the contact method between the acting end 118 of the anvil 106 and the diamond crystal 102 provides the possibility to achieve different stress application effects.

[0043] When point contact is adopted, the acting end 118 of the anvil 106 is usually processed into a spherical or sharp structure with a very small radius of curvature. In actual operation, with the help of high-precision positioning equipment, the acting end 118 of the anvil 106 is accurately placed at the target position on the stress application surface 108 of the diamond crystal 102. Due to the small contact area, when the stress applicator 114 applies stress, highly concentrated stress will be generated at the contact point.

[0044] When line contact is adopted, the acting end of the anvil is generally cylindrical or prismatic. When installing the anvil, it is necessary to ensure that the generatrix of its acting end is parallel to the stress application surface of the diamond crystal to form a stable line contact. The line length l can be customized according to experimental requirements. When adjusting the stress, according to the stress F and the stress of the stress applicator PBy changing the stress of the stress applicator, the stress acting on the crystal can be precisely controlled according to the relationship between P the stress applicator and the crystal. F .

[0045] When using surface contact, the working end of the anvil is designed as a planar structure adapted to the shape of the stress application surface of the diamond crystal. During the assembly process, through a high-precision flatness detection device, it is ensured that the working end is in close contact with the stress application surface, so that the contact area reaches the expected l×b .

[0046] The point contact method can generate extremely high stress concentration in a small area of the crystal, which makes it more precise to precisely control the Raman frequency shift of the diamond crystal at the microscale.

[0047] The line contact method can effectively control the direction and scope of stress action by adjusting the direction and length of the line. The surface contact ensures the uniform distribution of stress over a large area, enabling a stable and consistent Raman frequency shift effect to be obtained in applications requiring large-area uniform spectral regulation.

[0048] According to an embodiment of the present invention, when the contact method between the working end and the diamond crystal is line contact, when the line length is l , the stress F and the stress P of the stress applicator satisfy: ; When the contact method between the working end and the diamond crystal is surface contact, when the contact area is l×b , the stress F and the stress P of the stress applicator satisfy: ; wherein, α is the gradient angle of the anvil; When the contact method between the working end and the diamond crystal is point contact, the stress F and the stress P of the stress applicator satisfy: ; wherein, r is the radius of curvature of the working end.

[0049] In an embodiment of the present invention, when the contact method between the working end and the diamond crystal is line contact, when the line length is l , the stress F and the stress P of the stress applicator satisfy .

[0050] In an actual device, an anvil of a specific material is selected. Its working end is cylindrical and forms a line contact with the stress application surface of the diamond crystal. The line length l is accurately determined by a high-precision measuring tool. The stress applicator adopts a hydraulic drive method and can stably output stress P . During the experiment, a pressure sensor is used to monitor the stress of the stress applicator in real time P , and the size of P is precisely controlled by adjusting the pressure of the hydraulic system

[0051] . Through this line contact method and clear stress relationship, precise control of the stress on the diamond crystal can be achieved. Compared with other contact methods, line contact can apply stress more concentratedly to a certain extent, causing more obvious stress changes in specific areas of the diamond crystal, and then more effectively regulating the Raman frequency shift to obtain an ideal frequency spacing and spectral coverage range

[0052] When the contact method between the working end and the diamond crystal is surface contact, the contact area is l×b , and the stress F and the stress of the stress applicator P satisfy .

[0053] In the device construction, the working end of the anvil can be designed as a rectangular plane, which fits perfectly with the stress application surface of the diamond crystal. The contact area l×b is customized according to the experimental requirements and the size of the diamond crystal. The stress applicator can adopt an electric push rod structure, and the stress applied to the anvil is changed by precisely controlling the telescopic movement of the push rod through the motor P .

[0054] The surface contact method enables the stress to be evenly distributed on the stress application surface of the diamond crystal, which is beneficial to generating a stable stress field over a large area. This uniform stress distribution can make the Raman frequency shift of the diamond crystal more stable, reduce spectral fluctuations caused by uneven stress, improve the stability and reliability of spectral regulation, and can be applied to application scenarios with high requirements for spectral stability

[0055] When the contact method between the working end and the diamond crystal is point contact, the stress F and the stress of the stress applicator P satisfy .

[0056] The working end of the anvil can be processed into a spherical or curved surface, and its curvature radius r is determined by grinding and measurement. The stress applicator can adopt an electromagnetic drive, and the stress applied to the anvil is changed by controlling the magnitude of the current to adjust the electromagnetic force PThe tiny displacement of the diamond crystal surface during point contact is monitored in real time using a laser interferometer to reflect the change in stress.

[0057] The point contact method can generate highly concentrated stress on the diamond crystal, making the Raman frequency shift change in the local area more significant.

[0058] According to an embodiment of the present invention, the multi-wavelength frequency-spacing tunable hyperspectral laser device further includes a controller 120, which is electrically connected to the spectral analysis module 110, the laser module 100, and the stress applicator 114. The controller 120 is used to adjust the operating states of the laser module 100 and the Raman frequency shift control module based on at least one of the frequency spacing and the spectral coverage.

[0059] In an embodiment of the present invention, the multi-wavelength frequency-spacing tunable hyperspectral laser device further includes a controller 120, which is electrically connected to the spectral analysis module 110, the laser module 100, and the stress applicator 114. The controller 120 may use a high-performance microprocessor as the core and has a dedicated control algorithm built in. The spectral analysis module 110 transmits the data of the frequency spacing and the spectral coverage of the acquired Raman laser to the controller 120 in real time. The controller 120 can analyze and process the received data according to the preset frequency spacing and spectral coverage parameters. When there is a deviation between the actual frequency spacing or spectral coverage and the preset value, the controller 120 adjusts the parameters such as the power and frequency of the laser by sending control signals to the laser module 100; at the same time, it sends instructions to the stress applicator 114 to change the magnitude and direction of the applied stress, so as to adjust the operating state of the Raman frequency shift control module.

[0060] The controller 120 realizes the automated and intelligent control of the multi-wavelength frequency-spacing tunable hyperspectral laser device. It can quickly and accurately adjust the operating states of each module according to the actual spectral data, greatly improving the efficiency and accuracy of spectral control. It avoids the errors and instabilities of manual adjustment, enables the device to better adapt to different application requirements, and provides a key guarantee for realizing stable and reliable spectral control.

[0061] According to an embodiment of the present invention, the multi-wavelength frequency-spacing tunable hyperspectral laser device further includes a beam shaping module 122, which is arranged between the laser module 100 and the diamond crystal 102.

[0062] In one embodiment of the present invention, the multi-wavelength frequency-spacing tunable hyperspectral laser device further includes a beam shaping module 122, which is disposed between the laser module 100 and the diamond crystal 102. The beam shaping module 122 can adopt a diffractive optical element and design a specific diffraction pattern according to the wavelength of the laser and the required beam shape. When the laser beam passes through, its wavefront is changed to achieve beam shaping. For example, the originally divergent laser beam is shaped into a parallel beam, or the Gaussian beam is shaped into a flat-top beam. During the installation of the device, the position and angle of the diffractive optical element are precisely adjusted to ensure that the laser beam can accurately pass through the beam shaping module 122 and enter the diamond crystal 102 in an ideal shape.

[0063] The application of the beam shaping module 122 can optimize the propagation characteristics of the laser beam in the diamond crystal 102. The parallel beam can more uniformly excite the Raman scattering of the diamond crystal 102, improving the generation efficiency and uniformity of the Raman laser; the flat-top beam can generate a more uniform energy distribution on the surface of the diamond crystal 102, avoiding crystal damage caused by energy concentration. By improving the quality of the laser beam, it helps to obtain a more stable and higher-quality Raman laser, further enhancing the performance of the multi-wavelength frequency-spacing tunable hyperspectral laser device.

[0064] According to one embodiment of the present invention, the coverage range of the frequency spacing is ω 0 to ω F , ω 0 is the intrinsic Raman frequency quantity of the diamond crystal when there is no stress, ω F is the Raman frequency shift quantity of the diamond crystal under the stress state F ; ω F and the stress F satisfy: ; wherein, q represents the charge number, represents the dipole moment, H represents the Hamiltonian operator, Ψ represents the wave function of the system, E F represents the energy of the system after applying the stress F , q α , q β respectively represent the coordinates of the atomic nuclei α , β .

[0065] In one embodiment of the present invention, the coverage range of the frequency spacing is ω 0 to ω F , ω 0 which is the intrinsic Raman frequency quantity of the diamond crystal when there is no stress, ω F and F is the Raman frequency shift quantity of the diamond crystal under the stress state; ω F and the stress F satisfy: .

[0066] During the experimental measurement process, by changing the stress applied by the stress applicator F , the Raman frequency shift quantity of the diamond crystal under different stress states is measured in real time by using the spectral analysis module ω F . The spectral data is recorded using a high-precision spectrometer, and combined with theoretical calculations, the ω F and the stress F are verified and analyzed. Through multiple experiments, a curve of ω F changing with the stress F is plotted, providing data support for accurately regulating the frequency spacing.

[0067] The clear coverage range of the frequency spacing and the ω F relationship between and the stress F provide a theoretical basis and operation guide for spectral regulation. Enabling the operator to accurately control the frequency spacing by adjusting the stress F , realizing the continuous adjustability of the frequency spacing from the stress-free state to a specific stress state, greatly expanding the scope of spectral regulation, and meeting the diverse requirements of different application scenarios for the frequency spacing.

[0068] According to one embodiment of the present invention, the spectral analysis module 110 includes one of a Fourier transform spectrometer, an interferometer, and a photoelectric converter.

[0069] In one embodiment of the present invention, the Fourier transform spectrometer works on the principle of interference of light. After the Raman laser enters the spectrometer, it is first divided into two beams of light by a beam splitter, one beam of light is reflected by a fixed reflector, and the other beam of light is reflected by a movable reflector. When the two reflected light beams meet again, interference occurs to form an interference pattern. The detector converts the interference pattern into electrical signals, which are then transmitted to a computer. The computer uses special software to perform a Fourier transform on the interference pattern data, converting it from time domain information to frequency domain information, thereby accurately obtaining the frequency spacing and spectral coverage data of the Raman laser. In practical applications, in order to ensure the accuracy and stability of the measurement, the spectrometer needs to be calibrated regularly, and the parameters of the detector and the data acquisition frequency are reasonably set according to the intensity and characteristics of the laser.

[0070] The interferometer obtains spectral information by measuring the interference phenomenon of Raman laser. In the common Michelson interferometer, after the Raman laser is incident, it is split by the beam splitter into two beams propagating along different paths, and then converges again after reflection by the reflector to produce interference fringes. The interference fringes produced by light of different frequencies have different characteristics. By analyzing the spacing, intensity and other characteristics of the interference fringes, combined with the corresponding optical principles and algorithms, the frequency composition of the Raman laser can be calculated, and then the frequency spacing and spectral coverage can be determined. When building an interferometer, it is necessary to strictly control parameters such as the length of the optical path, the flatness and angle of the reflector to ensure the clarity and stability of the interference fringes and improve the measurement accuracy.

[0071] Photoelectric converters mainly work based on the photoelectric effect. Raman lasers are irradiated onto the photosensitive material of the photoelectric converter, and the photons excite the electrons in the material to generate photocurrent. The size of the photocurrent is related to the intensity of the incident light, and Raman lasers of different frequencies have different energies and will produce photocurrents of different intensities. By measuring and analyzing the photocurrent, combined with the pre-established model of the correspondence between photocurrent and frequency, the frequency information of the Raman laser can be indirectly obtained, thereby obtaining the frequency spacing and spectral coverage. In actual operation, it is necessary to select suitable photosensitive materials and amplifiers to improve the sensitivity and response speed of the photoelectric converter, and at the same time, shield the ambient light to reduce the impact of external interference on the measurement results.

[0072] The Fourier transform spectrometer has the advantage of high resolution, which can accurately distinguish the tiny frequency differences in Raman lasers and has extremely high measurement accuracy for frequency spacing. The interferometer has a relatively simple structure, low cost, and is easy to build and adjust. The photoelectric converter is small in size and fast in response, and can quickly convert optical signals into electrical signals for processing. When using it, you can flexibly choose according to actual needs.

[0073] like Figure 5As shown in the figure, an embodiment of the second aspect of the present invention provides a spectral regulation method for a multi-wavelength frequency-spacing tunable hyperspectral laser device as described above, including: Step 10, obtaining at least one of the actual frequency spacing and the actual spectral coverage range of the Raman laser through the spectral analysis module 110; Step 20, obtaining a first comparison result between the actual frequency spacing and the preset frequency spacing, and / or obtaining a second comparison result between the actual spectral coverage range and the preset spectral coverage range; Step 30, adjusting the working mode of the Raman frequency shift regulation module based on at least one of the first comparison result and the second comparison result.

[0074] According to the spectral regulation method provided by the embodiment of the second aspect of the present invention, by obtaining the actual parameters of the Raman laser in real time and comparing them with the preset parameters, it is possible to timely detect the deviation during the operation of the device and quickly make adjustments. This closed-loop feedback control mechanism greatly improves the accuracy of spectral regulation, enabling the frequency spacing and spectral coverage range of the Raman laser to more accurately meet the actual requirements, providing a strong guarantee for applications such as high-precision spectral analysis and laser processing. The regulation method can flexibly adjust the working mode of the Raman frequency shift regulation module according to actual needs, enabling the device to quickly adapt to various different application scenarios, and improving the versatility and flexibility of the device. The automated parameter acquisition, comparison, and adjustment process reduce the interference of human factors and reduce human errors. The operator only needs to set the preset parameters, and the device can automatically run and perform regulation, improving work efficiency and stability, and at the same time reducing experimental failures or product quality problems caused by improper human operation.

[0075] Please continue to refer to Figure 5 , in Step 10, the spectral analysis module 110 continuously works during the operation of the device. Taking a Fourier transform spectrometer as an example, the Raman laser exits from the second light-transmitting end of the diamond crystal 102 and enters the spectrometer. The laser is split into two beams by a beam splitter, one beam is reflected by a fixed mirror, and the other beam is reflected by a movable mirror. The two beams of light interfere again to form an interference pattern. The detector converts the interference pattern into an electrical signal, and the data acquisition system transmits the electrical signal to a computer. The spectral analysis software in the computer performs a Fourier transform on the interference pattern data to accurately obtain at least one parameter of the actual frequency spacing and the actual spectral coverage range of the Raman laser. In actual operation, in order to ensure the accuracy of the data, multiple measurements may be taken and the average value may be used.

[0076] In step 20, after obtaining the actual parameters, they will be compared with the preset standard parameters. For the frequency spacing, the system will calculate data such as the difference and ratio between the actual frequency spacing and the preset frequency spacing to form the first comparison result; for the spectral coverage range, the difference between the actual spectral coverage range and the preset spectral coverage range will also be calculated to obtain the second comparison result. These comparison results will be presented in the form of a data report or a visual chart to facilitate the operator to intuitively understand the operating state of the device.

[0077] In step 30, according to at least one of the first comparison result and the second comparison result, the system will adjust the working mode of the Raman frequency shift control module. If the actual frequency spacing is less than the preset frequency spacing, it indicates that the Raman frequency shift needs to be increased. At this time, the system will control the stress applicator 114 to increase the stress applied to the anvil 106, thereby increasing the stress on the diamond crystal 102 and increasing the Raman frequency shift; if the actual spectral coverage range exceeds the preset range, the system will adjust the distribution mode of stress application, such as changing the contact mode between the anvil 106 and the diamond crystal 102 or adjusting the direction of stress application, to narrow the spectral coverage range. This adjustment can be automatic or manual by the operator according to the comparison result.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hyperspectral laser device with adjustable multi-wavelength frequency spacing, characterized in that, Comprising: A laser module (100) corresponding to a first light-passing end face (104) of a diamond crystal (102) to generate Raman laser; A Raman frequency shift regulation module comprising a pair of anvil blocks (106), the pair of anvil blocks (106) acting on two stress application faces (108) of the diamond crystal (102) to apply gradient stress to the diamond crystal (102); A spectral analysis module (110) corresponding to a second light-passing end face (112) of the diamond crystal (102) to obtain at least one of a frequency spacing and a spectral coverage range of the Raman laser.

2. The hyperspectral laser device with tunable multi-wavelength frequency spacing according to claim 1, characterized in that The Raman frequency shift regulation module comprises a pair of stress applicators (114), the pair of stress applicators (114) being arranged corresponding to the two stress application faces (108) of the diamond crystal (102), and the anvil blocks (106) being arranged between the stress applicators (114) and the diamond crystal (102).

3. The hyperspectral laser device with tunable multi-wavelength frequency spacing according to claim 2, wherein, The anvil blocks (106) comprise a connection end (116) and an acting end (118) which are oppositely arranged, the connection end (116) being attached to the stress applicator (114), and the acting end (118) being attached to the stress application face (108) of the diamond crystal (102).

4. The hyperspectral laser device with tunable multi-wavelength frequency spacing according to claim 3, characterized in that, The contact mode between the acting end (118) and the diamond crystal (102) comprises at least one of point contact, line contact, and surface contact.

5. The hyperspectral laser device with tunable multi-wavelength frequency spacing according to claim 4, characterized in that, When the contact mode between the acting end and the diamond crystal is line contact, the line length is l At this time, the stress F and the stress of the stress applicator P Satisfy: ； Among them, α is the gradient angle of the anvil; When the contact mode between the acting end and the diamond crystal is surface contact, the contact area is l×b When the F stress is P satisfies the following: ； Wherein, α is the gradient angle of the opposed anvils; When the contact mode between the acting end and the diamond crystal is point contact, the stress F and the stress of the stress applicator P satisfy: ； Wherein, r is the radius of curvature of the acting end.

6. The hyperspectral laser device with tunable multi-wavelength frequency spacing according to claim 2, wherein The multi-wavelength frequency-spacing tunable hyperspectral laser device further comprises a controller (120), the controller (120) being electrically connected to the spectral analysis module (110), the laser module (100), and the stress applicator (114), and the controller (120) being configured to adjust the working states of the laser module (100) and the Raman frequency shift regulation module based on at least one of the frequency spacing and the spectral coverage range.

7. The hyperspectral laser device with tunable multi-wavelength frequency spacing according to any one of claims 1 to 6, characterized in that, The multi-wavelength frequency-spacing tunable hyperspectral laser device further comprises a beam shaping module (122), the beam shaping module (122) being arranged between the laser module (100) and the diamond crystal (102).

8. The hyperspectral laser device with tunable multi-wavelength frequency spacing according to any one of claims 1 to 6, characterized in that, The coverage range of the frequency spacing is ω 0 to ω F , ω 0 When there is no stress, it is the intrinsic Raman frequency quantity of the diamond crystal, ω F is the stress state F Under this condition, it is the Raman frequency shift quantity of the diamond crystal; ω F with stress F satisfy: ； Among them, q represents the charge number, represents the dipole moment, H represents the Hamiltonian operator, Ψ represents the wave function of the system, E F represents the applied stress F and the energy of the system after that, q α and q β respectively represent the coordinates of the atomic nuclei α and β respectively.

9. The hyperspectral laser device with tunable multi-wavelength frequency spacing according to any one of claims 1 to 6, characterized in that, The spectral analysis module (110) comprises one of a Fourier transform spectrometer, an interferometer, and a photoelectric converter.

10. A spectral control method for a multi-wavelength frequency-spacing tunable hyperspectral laser device according to any one of claims 1 to 9, characterized in that, Comprising: Obtaining at least one of an actual frequency spacing and an actual spectral coverage range of the Raman laser through the spectral analysis module (110); Obtaining a first comparison result between the actual frequency spacing and a preset frequency spacing, and / or obtaining a second comparison result between the actual spectral coverage range and a preset spectral coverage range; Adjusting the working mode of the Raman frequency shift regulation module based on at least one of the first comparison result and the second comparison result.

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